T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 1 of 6
1N935B-1 – 1N938B-1
Availa ble on
commercial
versions
Temperature Compensated
Zener Reference Diodes
Qualified per MIL-PRF-19500/156
Qualified Levels:
JAN, JANTX,
JANTXV and JANS
DESCRIPTION
The popular 1N935B-1 through 1N938B-1 series of Zero-TC (Temperature Compensated)
reference diodes provides a selection of 9.0 V nominal voltages and temperature coefficients
to as low as 0.001 %/oC for minimal voltage change with temperature when operated at 7.5
mA. These glass axial-leaded DO-35 reference diodes are also available in JAN, JANTX,
JANTXV and JANS military qualifications. For commercial applications it is also available as
RoHS compliant.
DO-35 (DO-204AH)
Package
Also available in:
DO-213AA MELF
(surface mount)
1N935BUR-1 – 1N938BUR-1
Important: For the latest information, visit our website http://www.microsemi.com.
FEATURES
• JEDEC registered 1N935 through 1N938 number series.
• Standard reference voltage of 9.0V +/- 5%.
• Temperature compensated.
• Interna l meta llurg ic al bond.
• Double plug cons tr uc tion .
• JAN, JANTX, JANTXV and JANS qualification are available per MIL-PRF-19500/156.
• RoHS compliant versions available (commercial grade only).
APPLICATIONS / BENEFITS
• Provides min im al volt age cha n ges over a broad temperature range.
• For instrumentation and other circuit designs requiring a stable voltage reference.
• Maximum temperature coefficient selections available from 0.01 %/ºC to 0.001 %/ºC.
• Flexible axial-lea d mount ing te rmina ls.
• Non-sensitive to ESD per MIL-STD-750 method 1020.
MAXIMUM RATINGS @ TA = 25 ºC unless otherwise stated
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
1-800-446-1158
Tel: (978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
Parameters/Test Conditions
Symbol
Value
Unit
Junction and Storage temperature
TJ and TSTG
-65 to +175
oC
Power Dissipation (1)
PD
500
mW
Maximum Zener Current
IZM
50
mA
Solder Pad Temperatures at 10 s
TSP
260
oC
Notes: 1. @ TL = 50 oC maximum (see figure 1). For optimum voltage-temperature stabilit y, IZ = 7.5 mA (less than
50 mW in dissipated power). Derate at 3.33 mW/oC above TA = +25 oC.
T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 2 of 6
1N935B-1 – 1N938B-1
• CASE: Hermetically sealed glass case. DO-35 (DO-204AH) package.
• TERMINALS: Tin-lead or RoHS compli ant anne ale d matte-tin plating (comm erc ial grad e only ) over copper clad steel. Solderable
per MIL-STD-750, method 2026.
• MARKING: Part number and cathode band.
• POLARITY: Reference diode to be operated with the banded (cathode) end positive with respect to the opposite end.
• TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number). Consult factory for quantities.
• WEIGHT: Approximately 0.2 grams.
• See package dimensions on last page.
JAN 1N935 B -1 e3
Reliability Level*
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
* (available on “B” suffix only)
Blank = Commercial
JEDEC type number
(see Electrical Characteristics
table)
RoHS Compli ance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgical Bond
Temperature Range
Blank = 0 to +75 ºC
A = -55 to +100 ºC
B = -55 to +150 ºC (required for
JAN level)
SYMBOLS & DEFINITIONS
Symbol
Definition
IZM
Maximum Zener Current: The maximum rated dc current for the specified power rating.
IZ, IZT, IZK
Regulator Current: The dc regulator current (IZ), at a specified test point (IZT), near breakdown knee (IZK).
VZ
Zener Voltage: The Zener voltage the device will exhibit at a specified current (IZ) in its breakdown region.
ZZT o r ZZK
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
specified rms current modulation (typically 10% of IZT or IZK) and superimpos ed on IZT or IZK respectively.
T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 3 of 6
1N935B-1 – 1N938B-1
MIL-PRF-
19500/156
JEDEC
TYPE
NUMBER
ZENER
VOLTAGE
VZ @ IZT
ZENER
TEST
CURRENT
IZT
MAXIMUM
ZENER
IMPEDACE
(Note 1)
ZZT
VOLTAGE
TEMPERATURE
STABILITY
∆VZT MAXIMUM
(Note 2)
TEMPERATURE
RANGE EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
Volts mA Ohms mV °C % / °C
1N935B-1 1N935-1
1N935A-1
1N935B-1
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
7.5
7.5
7.5
20
20
20
67
139
184
0 to +75
-55 to +100
-55 to +150
0.01
0.01
0.01
1N936-1
1N936A-1
1N936B-1
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
7.5
7.5
7.5
20
20
20
34
70
92
0 to +75
-55 to +100
-55 to +150
0.055
0.005
0.005
1N937B-1 1N937-1
1N937A-1
1N937B-1
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
7.5
7.5
7.5
20
20
20
13
28
37
0 to +75
-55 to +100
-55 to +150
0.002
0.002
0.002
1N938B-1 1N938-1
1N938A-1
1N938B-1
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
7.5
7.5
7.5
20
20
20
6.7
13.9
19
0 to +75
-55 to +100
-55 to +150
0.001
0.001
0.001
NOTE 1: Zener impedance is derived by superimposing on IZT A 60 Hz rms ac current equal to 10% of IZT.
NOTE 2: The maximum allowable change observed over the entire temperature range i.e., the di ode voltage will not exceed the s pecifi ed mV
at any discrete temperature bet ween the establis hed limits, per JEDEC standard No. 5.
T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 4 of 6
1N935B-1 – 1N938B-1
TL, Lead Temperature (C°) 3/8” from body
FIGURE 1
Power Derating Curve
Operating Current IZ (mA)
FIGURE 2
Zener Impedance vs. Operating Current
Pd, Rated Power
Dissipation (mW)
Zener Impedance Z
ZT
(Ohms)
T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 5 of 6
1N935B-1 – 1N938B-1
Operating Current IZ (mA)
FIGURE 3
Typical Change of Temperature Coefficient with Change in Operating Current
Change in Temperature Coefficient (%/°C)
T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 6 of 6
1N935B-1 – 1N938B-1
Ltr
Dimensions
Notes
Inch
Millimeters
Min
Max
Min
Max
BD
0.060
0.075
1.52
1.91
3
BL
0.140
0.180
3.56
4.57
3
LD
0.018
0.022
0.46
0.56
LL
1.000
1.500
25.40
38.10
LL1
0.050
1.27
4
NOTES:
1. Dimensions are in inches.
2. Millimeters are given for ge neral information only.
3. Package contour optional within BD and length BL. Heat slugs, if any shall be included within this cylinder but
sh all not be subject to minimum limit of BD.
4. Within this zone, lead diameter may vary to allow for lead finishes and irregularities, other than heat slugs.
5. In accordance with ASME Y14.5M, diam eters are equivalent to Φx symbology.
6. The dimensi ons shown are tighter in tolerance than dimensions shown in the military slash sheet (/156) since
Microsemi now only offers the smaller DO-35 package option rather than the larg er DO-7.