11525 Sorrento Valley Rd.
San Diego, California 92121
(858) 481- 0210
SPECIFICATION SHEET
P700L CURRENT LIMITING FUSE
SURFACE MOUNT MODEL
REVISION: ABCDEFGHJ
DATE: 10/95 2/96 2/00 10/95 2/96 10/98 4/00 3/01 3/04
DRAWN: Jeff Montgomery
CHECKED: Mike Van Linge / P.
Aguimatang
APPROVED: Jeff Montgomery
ECN: 2139 SHEET 1 OF 23
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 2 of 23
1. SCOPE
1.1 Scope. This specification establishes the requirements for thick film current limiting fuses.
Fuses described in this document are designed and manufactured for high reliability applications based on
guaranteed blow limits. These fuses are intended for use in direct (DC) and alternating current (AC) circuits and
are capable of operation over a temperature range of –55°C to +125°C ambient including high vacuum
environments.
2. LOT ACCEPTANCE TESTING
2.1 Lot Acceptance Testing. This specification provides for two acceptance levels for the
procurement of the fuses. The degree of testing and associated documentation can be specified as appropriate
to the end use of the fuses. Regardless of the acceptance level specified, the inherent quality and reliability of
the fuses will remain constant. The acceptance levels with the applicable inspection required are indicated in
Table I.
TABLE I. LOT ACCEPTANCE LEVEL.
3. APPLICABLE DOCUMENTS
3.1 Issues of Documents. The following specifications, standards and handbooks form a part of this
specification to the extent specified herein. In the event of a conflict between the documents referenced herein
and this specification, this specification governs.
SPECIFICATIONS
MIL-PRF-23419: General Specification for Instrument Type Fuses.
MIL-F-14256: Flux, Soldering, Liquid (Rosin Base).
STANDARDS
MIL-STD-202: Test Methods for Electronic and Electrical Component Parts.
MIL-STD-790: Reliability Assurance Program for Electronic Parts Specifications.
MIL-STD-1285: Marking of Electrical and Electronic Parts.
MIL-STD-45662: Calibration System Requirements.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 3 of 23
OTHERS
P700L-PA: Internal Visual Examination (Precap) for Current Limiting Fuses.
P700L-R: Radiographic Inspection for Current Limiting Fuses.
ASTM E595: Materials from Outgassing in a Vacuum Environment, Total Mass Loss
and Collected Volatile Condensable, Standard Test Method for.
4. REQUIREMENTS
4.1 Qualification. Fuses manufactured in accordance with this document shall be capable of passing
the qualification requirements specified in Table V and section 4 of this document.
4.2 Materials, Design and Construction. The materials, design and construction of the fuses shall be
as specified herein (see Figure 5 for flow chart of operations).
4.2.1 Terminals. The lead material shall be copper, electro tin-lead plated per MIL-P-81728 or solder
coated with Sn60 / Pb40 solder. Exposed base material may be present but shall not exceed 2% of the total lead
surface.
4.2.2 Housing. The housing material shall be polyphenylene sulfide (PPS). The PPS material shall be
insert molded to form the body of the fuse.
4.3 Voltage Rating. The voltage ratings for fuses specified herein are 50, 72 and 125 volts DC.
4.4 Current Rating. The current rating is the maximum amperes that the fuse will carry at a case
temperature of +25°C without degradation. The applicable current ratings are specified in Table VI.
4.5 Temperature Rating. The temperature rating for fuses specified herein is –55°C to +150°C
nonoperating. The maximum operating temperature shall not exceed a case temperature of +125°C. The
temperature derating curve is given in Figure 4.
4.6 Resistance Rating. The cold resistance of the fuses shall be as specified in Table VI when
measured in accordance with 5.8.2.
4.7 Marking. Fuses shall be marked in accordance with Method I of MIL-STD-1285. The following
information shall be marked on each fuse:
a) AEM Part Number (see Table VI)
b) Manufacture lot code (C-Lot)
Note: For marking examples, please refer to Figures 1 and 2.
4.8 Performance.
4.8.1 Therm al Shock (Group A and Group B). W hen fuses are tested in accordance with 5.8.3 herein,
they shall show no electrical or mechanical damage and there shall be no loosening of the terminals. Their cold
resistance shall not change by more than 10 percent from the pre-thermally shocked values.
4.8.2 Dielectric Strength. W hen fus es are tested in accordance with 5.8.4, the leakage c urrent shall not
exceed 1 milliampere.
4.8.3 X-Ray Inspection. When fuses are tested in accordance with 5.8.5, there shall be no rejections.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 4 of 23
4.8.4 Current-Carrying Capacity (Group C / Qualification Only). When fuses are tested in accordance
with 5.8.6, they shall show no evidence of mechanical damage and shall carry the current as specified without
electrical failure. The temperature of the case or terminals shall at no point rise more than +85°C above the ambient
air temperature. The maximum temperature rise for 6.0, 7.5, 10, 15 and 20 ampere fuses shall be +120°C.
4.8.5 Terminal Strength. W hen fuses are tested in accordance with 5.8.7, the lead terminals shall not
break or loosen. The cold resistance values shall not change by more than 10 percent.
4.8.6 Thermal Vacuum (Qualification Only). When fuses are tested in accordance with 5.8.16, they shall
not open circuit during the application of derated DC current nor shall there be evidence of arcing or mechanical
damage af ter the test. Fuses that are subj ected to the 400 perc ent overload cur rent test s hall "blow" within the time
period specified (see Table VI). The cold resistance values of those fuses not subjected to the overload current
shall not change by more than 10 percent when measured after thermal vacuum exposure.
4.8.7 Overload Current.
4.8.7.1 Overload Current Characterization. Each fuse lot shall be sam pled to assure that the blow times
fall within the lim its of Table VI. Eac h lot s hall be trunc ated to f o rm an inspec tion lot bas ed upon the c old res is tanc e
measured after thermal shock. The manufacturer shall blow samples (a minimum of 20 samples total) selected
from the extrem es of the truncated population to insure that their blow times are within the specification. T he r esults
of this procedure shall remain in the "Group A Data" with the lot data package.
4.8.7.2 Overload Current. Fus es selected f rom a tr uncated distribution shall be tes ted in accordanc e with
5.8.14. The clearing times and the maximum I2t shall be as specified in Table VI. After clearing, the circuit shall
rem ain open without clos ing again during a one-minute period. The let through energy during the one-m inute period
shall be included in the calculation of I2t. The blown fuses shall meet the resistance after firing test of 4.8.8.
4.8.8 Resistance after Firing. When blown fuses are tested in accordance with 5.8.15, the minimum
resistanc e shall be 10 megohm s. The f ollowing exceptions shall apply for fus es with current r atings greater than 5
amperes:
a) 250% Overload - A resistance value of 100K ohms minimum following the 250% overload test.
b) Other Overloads - A resistance value of 1 megohm minimum following overload testing.
4.8.9 Moisture Resistance (Group C / Qualification Only). When fuses are tested in accordance with
5.8.8, there shall be no evidence of cracking or peeling of the fuse body, loosening of the terminals or excessive
corrosion of the leads. The resistance of the fuses shall not change by more than 15 percent as a result of the
moisture exposure.
4.8.10 Shock (Gr oup C / Qualific ation Only). When f uses are tested in ac cordanc e with 5.8.9, there shall
be no evidence of mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.8.11 Vibration (Group C / Qualification Only). When fuses are tested in accordance with 5.8.10, there
shall be no evidence of mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.8.12 Low Temper ature Oper ation (Group C / Q ualific ation Only). When f uses are tested in ac cordanc e
with 5.8.12, they shall not open circuit and the fuse resistance shall not change by more than 10 percent.
4.8.13 Life (2000 Hours, Gr oup C / Qualif ic ation O nly). When fuses ar e tested in ac c or dance with 5.8.13,
they shall not open circuit and the fuse resistance shall not change by more than 10 percent.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 5 of 23
4.8.14 Resistance to Soldering Heat (Group C / Qualification Only). When fuses are tested in accordance
with 5.8.11, there shall be no mechanical damage and the fuse resistance shall not change by more than 10
percent.
4.8.15 Solderability. Fuses shall meet the solderability requirements specified in MIL-STD-202, Method
208.
4.8.16 Salt Spray (Group C / Qualific ation Only). When f uses are tested in ac cordanc e with 5.8.17, there
shall be no evidence of excessive corrosion. Excessive corrosion is defined as that which interferes with the
electrical or mechanical performance. There shall be no warping or cracking of the fuse body and the fuse
resistance shall not change by more than 10 percent.
4.8.17 Outgassing (Qualification Only). When fuses are tested in accordance with 5.8.18, the materials
shall meet the following requirements:
a) Total mass loss (TML) - Shall not exceed 1.0 percent.
b) Collected volatile condensable material (CVCM) - Shall not exceed 0.1 percent.
4.8.18 Short Circuit Interrupt (Group C / Qualification Only). When fuses are tested in accordance with
5.8.19, the resistance after short circuit testing shall be at least 1.0 megohm.
4.8.19 168-Hour Burn-In. When fuses are tested in accordance with 5.8.20, the fuse voltage-drop (as
meas ured at 10% rated current) shall not have changed by m ore than +/-10% of the pre-therm ally shoc ked value.
There shall be no evidence of external mechanical damage.
4.9 Workmanship. Fuses shall meet the visual and mechanical criteria outlined in AEM Process
Instructions P70617 and P70765 when inspected per 5.8.1.
4.9.1 Precap Inspection. Prior to molding all fuses shall be visually inspected with a minimum of 10
power magnification. Inspection criteria are outlined in the AEM Precap Document P700L-PA.
5. QUALITY A SS URANCE P ROVIS IONS
5.1 Classification of Inspection. The inspection of fuses procured to the requirements of this
specification shall be classified as follows:
a) Qualification Inspection (paragraph 5.6) when specified on the purchase order.
b) Acceptance Inspection (paragraph 5.7).
5.2 Reliability Assurance Program. AEM shall ensure that a reliability assurance program is
established and maintained in accordance with MIL-STD-790.
5.3 Test Equipment and Inspection Facilities. AEM shall establish and maintain a calibration system in
accordance with MIL-STD-45662.
5.4 Acceptance Inspection Reports. AEM shall supply with each shipment of fuses the following
minimum data:
a) Non-standard test reports as required by the purchase order.
b) Certification of Conformance signed by Quality Assurance Manager.
c) Group C data, if required by the purchase order, shall be shipped at the completion of Group C
inspection.
5.5 Inspection Conditions and Methods. Unless otherwise specified in this document, inspections shall
be conducted at room ambient environments of +25°C +/- 5°C and the maximum relative humidity shall be 75
percent.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 6 of 23
5.6 Qualification Inspection.
5.6.1 Qualific ation Samples. Samples submitted to qualif ic ation inspec tion s hall be r epres entative of the
norm al high reliability production. A sam ple of 32 f us es r epres enting the lowest, middle, and highest co ld res ist ance
values within the truncated distribution s hall be submitted f or qualif ic ation inspec tion. At the c ompletion of Subgr oup
I inspection, the 32 samples shall be divided into the subgroups and quantities shown in Table V. Each subgroup
shall have approximately equal representation of the fuse cold resistance values.
5.7 Acceptance Inspection.
5.7.1 Inspection of Fuses for Delivery. Inspection of fuses for delivery against a purchase order shall
consist of the tests listed in Table I.
5.7.2 Inspection Lot. An inspection lot shall consist of one amperage rating of one lot date code.
5.7.3 Group A Inspection. Group A inspection shall consist of the tests listed in Table II and shall be
conducted in the order indicated.
5.7.4 Group B Inspection. Group B inspection shall consist of the tests listed in Table III and shall be
conducted in the order indicated. All f us es submitted to Gr oup B ins pec tion shall have s uc c es sfully met all electric al
requirements of the Group A inspection (Visual rejects and X-Ray rejects may be utiliz ed for Group B inspection).
5.7.5 Group C Inspection. Group C inspection, when required by the purchase order, shall consist of the
tests listed in Table IV. The fuses submitted for Group C inspection shall have met Group A and Group B inspection
requirements as part of the inspection lot from which they were taken. Group C inspection must be completed within
150 day s after the completion of Group B inspection.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 7 of 23
TABLE II. GROUP A INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 8 of 23
TABLE III. GROUP B INSPECTION.
Subgroup I: 20 Samples Required
Examination or
Test Requirement
Paragraph Method Paragraph Number of
Samples (Note 1) Number of
Defectives
Allowed
Solderability 4.8.15 20 0
Terminal Strength 4.8.5 5.8.7 20 0
Overload Current 4.8.7.2 5.8.14 20 0
Resistance After
Firing 4.8.8 5.8.15 20 0
Notes:
1) Overload Current Samples Shall Be as Follows:
250% Overload Current – 12 Samples
400% Overload Current – 4 Samples
600% Overload Current – 4 Samples
Subgroup II: 22 Samples Required:
Examination or
Test Requirement
Paragraph Method Paragraph Number of
Samples Number of
Defectives
Allowed
Thermal Shock 4.8.1 5.8.3 22 0
168-Hour Burn-In 4.8.19 5.8.20 22 0
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 9 of 23
TABLE IV. GROUP C INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 10 of 23
TABLE V. QUALIFICATION INSPECTION.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 11 of 23
TABLE VI. ELECTRICAL AND MECHANICAL REQUIREMENTS.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 12 of 23
5.8 Methods of Examination and Test.
5.8.1 Visual and Mechanical Inspection. Fuses shall be visually and mechanically examined per AEM
Process Instruction P70617 following the molding operation. Fuses shall be visually and mechanically examined per
AEM Process Instruction P70765 following the final assembly and marking operations.
5.8.2 Resistance. The resistance of the fuse shall be measured using a constant current DC source
having an open circuit voltage not greater than the voltage rating of the fuse. The resistance of the fuse shall be
measured using one of the following two methods:
Method I: The resistance shall be measured using a constant current DC source having an open
circuit voltage not greater than the voltage rating of the f us e. The m eas urement cur rent s hall be f r om 0.1 to
10 milliamperes and provide a measurement accuracy of +/- 1%. A Keithley Model 580 Micro-Ohmmeter or
equivalent is recommended for these measurements.
Method II: The fuses shall be electrically connected to a constant DC source supplying 10% of the
rated current of the fuse and having an open circuit voltage not greater than the voltage rating of the fuse.
The voltage drop of each f use shall be measur ed and the res is tanc e calc ulated f r om the m eas ur ed voltage
drop.
5.8.3 Therm al Shock . Fuses shall be test ed in accordance with Method 107, T est Condition B, of MIL-
STD-202. A total of five cycles s hall be run without interruption. T he cold r esistanc e of the f uses shall be m easur ed
before and after the five cycles in accordance with 5.8.2.
5.8.4 Dielectric Str ength. Fuses shall be tested in ac cordanc e with Method 301 of MIL- STD- 202. Fus es
shall be mounted in a test fixture capable of exposing all major surfaces of the fuse body and leads to the test
voltage. The test voltage shall be applied to the terminals electrically tied together and to the test fixture. The
following details shall apply:
a) Test voltage - 500 VRMS.
b) Duration - 5 seconds for acceptance tests.
- 60 seconds for qualification tests.
c) Leakage current - 1 milliampere maximum.
d) Measurements - DC resistance of the f us e af ter the dielec tr ic s tr ength expos ur e in
accordance with 5.8.2.
5.8.5 X-Ray Inspection. Fus es shall be subjected to r adiographic inspection in ac cordance with Method
209 of MIL-STD-202. The following details shall apply:
a) The radiograph shall be of sufficient quality to render a clear, sharp image of the penetrameter.
b) The source-object distance shall ensure a sharply defined image.
c) Two views of each fuse (0° and 90°) shall be provided.
d) A radiograph penetrameter shall be included on each radiographic film.
e) Radiographs shall be examined at 10X magnification for the defects specified in AEM P700L-R
Specification.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 13 of 23
5.8.6 Current-C arrying Capacity (Group C / Qualif ication Only). Fuse sam ples shall be appor tioned and
subm itted to the following DC test cur rents at -55°C to -60°C, at +20°C to +35°C (room am bient tem perature), and
at +125°C to +130°C:
Test Temperature DC Test Current
-55°C 110% of Rated
+25°C 100% of Rated
+ 125°C 80% of Rated
The test curr ent shall be maintained for 30 minutes af ter the temperature of each fuse has stabilized, but shall not
be applied for les s than 1.5 hours. It m ay be assum ed that the temperatur e has stabilized when three consecutive
temperature readings tak en at 10 minute intervals show no rise in tem perature. The tem perature of the fuse body
shall be measured by thermocouples (wire size 28 to 32 AWG).
5.8.7 Terminal Strength. Fuses shall be tested in accordance with Method 211 of MIL-STD-202. The
following exceptions shall apply:
a) Tes t Condition - Te st Condition A (5 lb pull) applying the force ax ially to each lead wire individually
(solder .026 inch diameter wires to leads prior to testing).
b) Method of Holding - The fuse body shall be held by means other than rigid clamping to prevent
stresses from being transferred to the fuse element.
c) Measurements - DC resistance measurements shall be taken before and after exposure in
accordance with 5.8.2.
5.8.8 Moisture Resistance (Group C / Qualification Only). Fuses shall be tested in accordance with
Method 106 of MIL-STD-202. The following exceptions shall apply :
a) Mounting - Normal mounting means on a noncorrosive metal panel positioned 15 degrees from the
vertical with the terminals facing up.
b) Polarizing voltage shall be 100 volts DC.
c) Steps 7a and 7b are not applicable.
d) Measurements - DC resistance measurements shall be taken before and after the exposure in
accordance with 5.8.2.
5.8.9 Shock (Group C / Qualification Only). Fuses shall be tested in accordance with Method 213 of
MIL-STD-202. The following details and exceptions shall apply :
a) Mounting - Fuses shall be securely fastened to the table of the shock m achine to prevent relative
motion between the fuses and the table.
b) Test Condition - F (except 1500G, 0.5 milliseconds, half-sine)
c) Loading during Test - Rated DC current on half of the samples tested.
d) Number of Shocks - Three shocks in each direction of three mutually perpendicular axes (18
shocks total).
e) Measurements - DC resistance measurements shall be taken before and after the shock exposure
in accordance with 5.8.2.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 14 of 23
5.8.10 Vibration (Gr oup C / Qualification Only). Fuses s hall be tested in accordance with Method 204 of
MIL-STD-202. The following details and exceptions shall apply :
a) Mounting - Fuses shall be securely fastened to the table of the vibration machine to prevent relative
motion between the fuses and the table.
b) Test Level - Sinusoidal vibration from 5 to 3000 hertz, 0.4 inch double amplitude or 30G's peak,
whichever is less.
c) Sweep Rate - Approximately 1/2 octave per minute.
d) Test Duration - 12 hours total (4 hours in each of three major axes).
e) Loading during Testing - Rated DC current on half of the samples tested.
f) Measurements - DC resistance measurements shall be taken before and after the vibration
exposure in accordance with 5.8.2.
5.8.11 Resistance to Soldering Heat (Group C / Qualification Only). Fuses shall be tested in a vapor
phase test device and the boiling liquid shall be FC-70 or equivalent. A thermocouple (wire size 28 to 32 AWG) shall
be attached to the body of one fuse for the purpose of monitoring case temperature during testing. The test
sam ples shall be placed in the vapor f or a period of 180 +/- 10 seconds after the case temper ature has reached a
temperature of +215°C. After the vapor exposure, the fuses shall be allowed to cool for 10 minutes at room
temperature. The DC resistance of the fuses shall be measured before and after the test in accordance with 5.8.2.
5.8.12 Low Temperature Operation (Group C / Qualification Only). Fuses shall be soldered to test boards
and placed in a low temper ature chamber . The cham ber temperatur e shall be lowered gradually to –55°C +0/-3°C
within a period of 1 hour. After stabilizing at the low temperature for a period of 1 hour, rated DC current shall be
applied to the fuses f or a period of 4 +1/-0 hours while at the low temper atur e. T he c hamber shall then be gradually
raised to room temperature within a 4 hour period and maintained at room temperature for a period of 8 hours
minimum. After this time, the DC current shall be removed from the fuses and the fuses removed from the
chamber. The DC resistance of the fuses shall be measured before and after the test in accordance with 5.8.2.
5.8.13 Life (2000 Hour s, Group C / Qualif ication Only). Fus es shall be solder ed on a s uitable test board
and placed in a chamber at +125°C +3/-0°C ambient. The fuses shall be electrically connected to a DC source
supplying 64 percent of the +25°C rated current. The current source shall supply an open circuit voltage equal to the
voltage rating of the f us es . The fus es s hall r emain in the chamber at the spec if ied c ur rent for 2000 +/- 8 hour s. T he
electrical c ircuit shall pr ovide a suitable indicator, which s hall be monitored daily during the length of the lif e test, to
identify f ailure (blowing) of any fuse. T he time of failure s hall be recorded to the neares t +/-12 hours and the blown
fuse replaced with a short circuit for the remainder of the test. The DC resistance of the fuses shall be measured
before and after the test in accordance with 5.8.2.
5.8.14 Overload Current. F uses s hall be subjec ted to the applic able perc ent of DC curr ent (250%, 400%
or 600%) as specified in Table VI. For Group B and Group C inspections, the fuses shall be tested while at case
temperatures of +25° to +35°C. For qualification inspection (Subgroup II, Table V) and Group C inspection
(Subgroup II, Table IV) the fuses shall be divided equally and tested at +25°C to 35°C, and at +125°C to +130°C.
The low impedance source shall be adjusted to supply an open circuit voltage equal to the rating of the fuse. The
time to "blow" (the interval measured from the application of the current to the time the current drops below the
rating of the fuse) shall be measured f or each fus e. Each fuse shall r emain in the test cir cuit for 1 m inute after the
fuse opens to check for restrike conditions. The maximum clearing I2T shall be determined using an oscillogram
showing the current tr ace. The determ ination shall be m ade by application of Sim pson's rule. A rec omm ended test
circuit is shown in Figure 3.
5.8.15 Resistance after Firing. The open resistance of the "blown" fuse shall be measured by applying
rated DC voltage across the terminals of the fuse. The resistance value shall be taken after a one-minute
application of the test voltage.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 15 of 23
5.8.16 Thermal Vacuum (Qualification Only). Fuses shall be mounted in suitable mount sockets. The
fuses shall then be placed in a vacuum chamber and the chamber evacuated to a pressure of 5 X 10-5 torr
max imum . T he tem peratur e of the fuse m ount shall be controlled s uch that the temperatur e of the f us es, measur ed
with a therm ocouple m ounted on the f use body, is m aintained at +125 +/- 3°C for a per iod of 48 +4, - 0 hours, while
90% of the +25°C rated current is flowing through each fuse. At the end of the 48 hour exposure and while the fuses
are at the test temperature and pressure, half of the sam ples shall be given an overload current at 400 percent of
their rated cur rent using the pr ocedure s pecified in 5.8.14. T he f uses shall then be rem oved fr om the cham ber and
the remaining fuses (not blown) measured for DC resistance in accordance with 5.8.2.
5.8.17 Salt Spray (Group C / Qualification Only). Fuses shall be tested in accordance with Method 101 of
MIL-STD-202. The following details shall apply :
a) Five percent salt solution.
b) Test Condition B.
c) Following the dry i ng period, the fuses shall be subjected to 100 percent of rated current for 1 hour.
d) Following the test the fuses shall be examined for compliance with 4.8.16.
5.8.18 Outgassing (Qualification Only ). The fuses or fuse materials shall be tested as specified in ASTM
E595.
5.8.19 Short Circuit Interrupt (Group C / Qualification Only). Fuses shall be placed in a DC test circuit
capable of supplying a minimum of 1000 amperes. The test circuit shall be made using appropriate generating
equipment as a source of power and with the rate of current r ise for the test c ircuit adjusted for at least 3.25 X 106
amper es per second. The open circuit voltage of the test circuit shall be adj usted to a value equal to the m aximum
rating of the fuse to be tested.
5.8.20 168-Hour Burn-In Tes ting (Gr oup B). Fuses shall be s older mounted onto suitable tes t boar ds and
connected in an electr ically series circ uit. Prior to tes ting, the voltage-drop ( at 10% rated c urrent) of each f use s hall
be measured and recorded. Voltage-drop measurements shall be accomplished by probing the fuse leads in the
lead egress area. The mounted fuses shall then be subjected to 5 cycles of thermal shock testing per paragraph
5.8.3. Following the thermal shock exposure, the fuses shall be subjected to 168 hours (+4/-0 hours) of rated
current testing. During burn-in testing, the ambient r oom tem perature shall be m aintained at from +25°C to +28°C.
Fuse case tem perature will not be controlled during the burn-in test. F ollowing the 168-hour bur n-in exposure, the
fuse voltage-drop at 10% rated current shall be measured.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 16 of 23
6. APPLICATIONS
6.1 Parallel Operation. Fuses may be used in parallel operation to gain current-carrying capability.
When fuses are to be utilized in parallel configurations, the fuses shall be procured as matched sets. The
requirements for matched set fuses are indicated below.
a) Each matched set shall consist of two or more fuses.
b) Matched set fuses shall be from the same manufacturing lot (same voltage and current rating).
c) Matched set fuses shall be created by matching individual cold resistance values within the set to
within 1% (highest to lowest within individual set). The cold resistance values used for matching
shall be extracted from the resistance values measured following the thermal shock test.
d) Matched set f uses shall be m ark ed in accordanc e with paragraph 4.7 except that the part number
shall be modified to indicate the set amperage value and the number of fuses within the set (see
ma tched set exam ples below). Additionally, m atched set s erial label shall be placed on the side of
each part. Matched set serial labels shall consist of a unique num ber for each f us e s et, f ollowed by
a unique letter for each fuse within the set (i.e., 001A, 001B, 001C, 001D; 002A, 002B, 002C,
002D; etc.). Matc hed fuses m ay exceed the max imum width dimension by .010 inc hes as a res ult
of the match set label.
e) Matched set fuses shall be packaged together, separate from other matched set fuses.
f) Data generated by the matching requirement shall be included with fuse shipment.
g) The number of fuses within the matched set shall be specified on the purchase order.
Matched-Set Examples:
P700L-72-30.0-M2 (two P700L-72-15.0 supplied as a matched set forming a 30 amp equivalent fuse)
P700L-50-40.0-M2 (two P700L-50-20.0 supplied as a matched set forming a 40 amp equivalent fuse)
6.2 Installation. Fuses may be mounted directly onto a printed circuit board. As the internal solder
utilized for the standard P700L part type is Sn96 / Ag4, the maximum fuse case temperature
should not exceed 221°C during the board level solder reflow processing.
6.3 Application Notes.
6.3.1 Thermal Shock Environments. When operation is required in temperature cycled
environments, P700L part types (Sn96 / Ag4 internal solder) are suggested. Extensive thermal
shock testing at AEM has shown this part type capable of withstanding over 1000 cycles of thermal
shock when tested per Method 107 of Mil-Std-202 (-65°C to +125°C).
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 17 of 23
FIGURE 1. DIMENSIONS, CONSTRUCTION AND MARKING.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 18 of 23
FIGURE 2. DIMENSIONS, CONSTRUCTION AND MARKING
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 19 of 23
FIGURE 3. OVERLOAD CURRENT TEST CIRCUIT.
FIGURE 4. CURRENT DERATING LIMITS.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 20 of 23
FIGURE 5. OPERATIONS FLOW CHART.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 21 of 23
DOCUMENTATION CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
A 11-25-95 N/A Issue New Drawing F.D.
B 8-8-94 14 Para. 5.8.8; Revised Terminal F.D.
Strength Test To Include Addition
Of .026 Dia. Wire.
C 6-2-95 10 Revised Group C Test Plan Per J.M.
Mil-PRF-23419/12 Spec.
All Changed Company References From
Mepcopal to AEM.
D 10-10-95 17 Para. 6.2; Added Note to include that
case temperature should not exceed 215°C
at any time during reflow process.
8 Revised Table II; Added Resistance
measurement before Thermal Shock.
13 Para. 5.8.2; Added Method II.
E 2-9-96 ALL Added "Group C / Qualification Only" J.M.
for all Group C / Qual. Test paragraphs.
ALL Removed all references to MIL-STD-690.
ALL Removed all references to Mepcopal.
4 Revised para. 4.6.
5 Revised para. 4.8.6.1 to 20 samples min.
6 Revised para. 4.9.
7 Revised para. 5.3 and 5.7.5.
8 Revised Table II (Position of DWV Test)
added PDA Note 1.
10 Revised Table IV to follow MIL-PRF-23419/12.
11 Revised Table V to follow MIL-PRF-23419/12
13 Revised para. 5.8.1 to list AEM procedures.
15 Revised para. 5.8.8 and 5.8.9.
16 Revised para. 5.8.13 added Group C.
21 Revised Flow Chart to follow MIL-PRF-23419/12.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 22 of 23
DOCUMENTATION CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
F 10-12-98 2 Revised para. 3.1 added reference to P700L-R specification.
ECN 2109 4 Added para. 4.8.3 X-Ray Inspection.
8 Revised Table II added X-Ray Inspection.
9 Revised Table III changed order of testing.
11 Revised T able V added: Overload Cur r ent (400%) , Short Circuit Inter rupt,
and Resistance After Firing to Subgroup III.
14 Added para. 5.8.5 X-Ray Inspection.
17 Deleted the Note in para. 6.2 referring to SN96 solder being used
internally.
18 Revised Figure 1 - Internal solder to be SN 10/PB 88/AG 2.
19 Revised Figure 2 - Internal solder to be SN 10/PB 88/AG 2.
21 Revised Figure 5 - Added X-Ray Inspection, and Radiographic Review,
Changed the order of Group B Inspection.
10 Revised Table IV to indicate Number of Defective Allowed.
8 Revised Table II to indicate Number of Defective Allowed.
12 Revised Table VI to reference Figure 1 or 2. Corrected 250% Let Thru
Energy ratings for fuses rated at 3/8 to 20 amperes.
13 Revised paragraph 5.8.1 (Deleted references to final assembly ,
marking and sealing operations).
G 4-11-00 All Document retyped in Word format.
ECN 2119 3 Deleted reference to P600L-M Specification in para. 3.1.
6 Revised para. 5.7.4 to allow for use of X-Ray and Visual rejects
for Group B Inspection.
7 Revised Table II to reference MIL-PRF-23419 (previously
referenced MIL-F-23419).
11 Revised Table VI to include P700L-125-XX part options.
13 Revised para. 5.8.6 to specify 80% rated current at +125C
(previously stated 75% rated current at +125C).
15 Revised para. 6.1 to list match set fuse requirements.
AEM, Inc. 11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306. TITLE
P700L SPECIFICATION
NUMBER P700L REVISION J ECN 2139 SHEET 23 of 23
DOCUMENTATION CHANGE NOTICE
REV. LETTER REV. DATE PAGE CHANGE ITEM APPROVAL
G 4-11-00 17 Revised Figure 1 to include minimum
ECN 2119 and maximum dimensions. Revised
suggested pad layout.
18 Revised Figure 2 to include minimum
and maximum dimensions. Revised
suggested pad layout. Revised weight
to specify 1.85 grams (previously stated
1.25 grams).
19 Revised Figure 3 to indicate 80% rated
current at +125C previously stated 75%
rated current at +125C).
H 3-12-01 3 Revised para. 4.2.1 to indicate that exposed copper
ECN 2126 shall not exceed 2% of total lead surface.
11 Added Note 4 to table VI to indicate that P700L with
Internal solder of Sn10/Pb88/Ag2 should be ordered as P700LH.
16 Revised para. 6.2 to indicate case temperature limitation for
standard P700L part type.
16 Added section 6.3 for operation in thermal cycled
environments.
17 Revised Figure 1 – Internal solder to be Sn96/Ag 4.
Added note to indicate that Sn10/Pb88/Ag2 can be used
for internal solder with P700LH option.
18 Revised Figure 2 - Internal solder to be Sn96/Ag 4.
Added note to indicate that Sn10/Pb88/Ag2 can be used
for internal solder with P700LH option.
J 3/04 5 Added para. 4.8.19 for 168-hour burn-in testing
ECN 2139 requirements.
8 Revised Table III (Group B) to include Subgroup
II for 168-hour burn-in testing.
15 Added para. 5.8.20 for 168-hour burn-in test method.
20 Revised Figure 5 to include Thermal Shock and 168-Hour
Burn-in Test as Subgroup II of Group B.
