T4-LDS-0158 , Rev. 2 (121998) ©2013 Microsemi Corporation Page 1 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
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 1N935BUR-1 through 1N938BUR-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 surface mount DO-213AA reference diodes are also
available in JAN, JANTX, JANTXV and JANS military qualifications. For commercial
applicat ions it is also a vaila ble as RoHS compliant (not applicable to military).
DO-213AA MELF
Package
Also available in:
DO-35 (DO-204AH)
package
(axial-leaded)
1N935B-1 – 1N938B-1
Important: For the latest information, visit our website http://www.microsemi.com.
FEATURES
• Surface mount equivalent of JEDEC registered 1N 935 through 1N938 number series.
• Standard reference voltage of 9.0V +/- 5%.
• Temperature compensated.
• Interna l meta llurg ic al bond.
• Double plug construction.
• 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 instrum entation and other circuit designs requiring a stable voltage reference.
• Maximum temperature coefficient selections available from 0.01 %/ºC to 0.001 %/ºC.
• MELF surface mou nt.
• 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. @ TEC = 50 oC (see figure 1). For optimum voltage-temperature stability, IZ = 7.5 mA (less than 50 mW
in dissipated power). Derate at 3.33 mW/oC above TA = +25 oC.
T4-LDS-0158 , Rev. 2 (121998) ©2013 Microsemi Corporation Page 2 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
• CASE: Hermetically sealed glass case package.
• TERMINALS: Tin/lead plated or RoHS compliant matte-tin (on commercial grade only) over copper clad steel. Solderable per
MIL-STD-750, method 2026.
• POLARITY: Cathode end is banded.
• MOUNTING: The axial coefficient of expansion (COE) of this device is approximately +6PPM/°C. The COE of the mounting
surface system should be selected to provide a suitable match with this device.
• MARKING: Part number.
• TAPE & REEL option: Standard per EIA-296. Consult factory for quantities.
• WEIGHT: Approximately 0.04 grams.
• See Package Dimensions on last page.
JAN 1N935 B UR -1 e3
Reliability Level*
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
Blank = Commercial
*(available on “B” suffix only)
JEDEC type number
(see Electrical Characteristics
table)
RoHS Compli ance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgical Bond
MELF Surface Mount
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 or ZZK
Dynamic Impeda nce: 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 superimposed on IZT or IZK respectively.
T4-LDS-0158 , Rev. 2 (121998) ©2013 Microsemi Corporation Page 3 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
MIL-PRF-
19500/156
MSC TYPE
NUMBER
(Note 1)
ZENER
VOLTAGE
VZ @ IZT
ZENER
TEST
CURRENT
IZT
MAXIMUM
ZENER
IMPEDACE
(Note 2)
ZZT
VOLTAGE
TEMPERATURE
STABILITY
∆VZT MAXIMUM
(Note 3)
TEMPERATURE
RANGE EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
Volts mA Ohms mV °C % / °C
1N935BUR-1 CDLL935
CDLL935A
CDLL935B
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
CDLL936
CDLL936A
CDLL936B
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
0.005
0.005
0.005
1N937BUR-1 CDLL937
CDLL937A
CDLL937B
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
1N938BUR-1 CDLL938
CDLL938A
CDLL938B
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: Microsemi CDLL prefixed numbers are commercial use only. For high-reliability applic ations JAN prefixed 1N numbers must be
selected along with the B suffix.
NOTE 2: Zener impedance is derived by superimposing on IZT A 60 Hz rms ac current equal to 10% of IZT.
NOTE 3: The maximum allowable change observed over the entire temperature range i.e., the di ode voltage will not exceed the s pecified mV
at any discrete temperature bet ween the establis hed limits, per JEDEC standard No. 5.
T4-LDS-0158 , Rev. 2 (121998) ©2013 Microsemi Corporation Page 4 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
TEC, End Cap 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-0158 , Rev. 2 (121998) ©2013 Microsemi Corporation Page 5 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
Operating Current IZ (mA)
F IGURE 3
Typical Change of Temperature Coefficient with Change in Operating Current
Change in Temperature Coefficient (%/°C)
T4-LDS-0158 , Rev. 2 (121998) ©2013 Microsemi Corporation Page 6 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
NOTES:
1. Dimensions are in inches. Millimeters are given for general information only.
2. Dimensions are pre-solder dip.
3. Referencing to dimension S, minimum clearance of glass body to mounting surface on all orientations.
4. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
DIM
INCH
MILLIMETERS
MIN
MAX
MIN
MAX
BD
0.063
0.067
1.60
1.70
BL
0.130
0.146
3.30
3.71
ECT
0.016
0.022
0.41
0.56
S
0.001
-
0.03
-
INCH
mm
A
0.200
5.08
B
0.055
1.40
C
0.080
2.03