1N935B-1 – 1N938B-1
Temperature Compensated
Zener Reference Diodes
Qualified per MIL-PRF-19500/156
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 %/
o
C 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.
Available on
commercial
versions
Qualified Levels:
JAN, JANTX,
JANTXV and JANS
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.
Internal metallurgical bond.
Double plug construction.
JAN, JANTX, JANTXV and JANS qualification are available per MIL-PRF-19500/156.
RoHS compliant versions available (commercial grade only).
DO-35
(DO-204AH)
Package
Also available in:
DO-213AA MELF
(surface mount)
1N935BUR-1 – 1N938BUR-1
APPLICATIONS / BENEFITS
•
•
•
•
•
Provides minimal voltage changes 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-lead mounting terminals.
Non-sensitive to ESD per MIL-STD-750 method 1020.
MAXIMUM RATINGS
@
T
A
= 25
ºC
unless otherwise stated
Parameters/Test Conditions
Junction and Storage temperature
(1)
Power Dissipation
Maximum Zener Current
Solder Pad Temperatures at 10 s
Symbol
T
J
and T
STG
P
D
I
ZM
T
SP
Value
-65 to +175
500
50
260
Unit
o
C
mW
mA
o
C
Notes:
1. @ T
L
= 50
o
C maximum (see
figure 1).
For optimum voltage-temperature stability, I
Z
= 7.5 mA (less than
50 mW in dissipated power). Derate at 3.33 mW/
o
C above T
A
= +25
o
C
.
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
T4-LDS-0155, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 1 of 6
1N935B-1 – 1N938B-1
MECHANICAL and PACKAGING
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•
•
•
•
•
•
CASE: Hermetically sealed glass case. DO-35 (DO-204AH) package.
TERMINALS: Tin-lead or RoHS compliant annealed matte-tin plating (commercial grade 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.
PART NOMENCLATURE
JAN
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)
1N935
B
-1
e3
RoHS Compliance
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)
Symbol
I
ZM
I
Z
, I
ZT
, I
ZK
V
Z
Z
ZT
or Z
ZK
SYMBOLS & DEFINITIONS
Definition
Maximum Zener Current: The maximum rated dc current for the specified power rating.
Regulator Current: The dc regulator current (I
Z
), at a specified test point (I
ZT
), near breakdown knee (I
ZK
).
Zener Voltage: The Zener voltage the device will exhibit at a specified current (I
Z
) in its breakdown region.
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 I
ZT
or I
ZK
) and superimposed on I
ZT
or I
ZK
respectively.
T4-LDS-0155, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 2 of 6
1N935B-1 – 1N938B-1
ELECTRICAL CHARACTERISTICS
@ 25 C unless otherwise specified
JEDEC
TYPE
NUMBER
ZENER
VOLTAGE
V
Z
@ I
ZT
Volts
1N935B-1
1N935-1
1N935A-1
1N935B-1
1N936-1
1N936A-1
1N936B-1
1N937B-1
1N937-1
1N937A-1
1N937B-1
1N938-1
1N938A-1
1N938B-1
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
ZENER
TEST
CURRENT
I
ZT
mA
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
MAXIMUM
ZENER
IMPEDACE
(Note 1)
Z
ZT
Ohms
20
20
20
20
20
20
20
20
20
20
20
20
VOLTAGE
TEMPERATURE
STABILITY
∆V
ZT
MAXIMUM
(Note 2)
mV
67
139
184
34
70
92
13
28
37
6.7
13.9
19
TEMPERATURE
RANGE
EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
% / °C
0.01
0.01
0.01
0.055
0.005
0.005
0.002
0.002
0.002
0.001
0.001
0.001
o
MIL-PRF-
19500/156
°C
0 to +75
-55 to +100
-55 to +150
0 to +75
-55 to +100
-55 to +150
0 to +75
-55 to +100
-55 to +150
0 to +75
-55 to +100
-55 to +150
1N938B-1
NOTE 1:
Zener impedance is derived by superimposing on I
ZT
A 60 Hz rms ac current equal to 10% of I
ZT
.
NOTE 2:
The maximum allowable change observed over the entire temperature range i.e., the diode voltage will not exceed the specified mV
at any discrete temperature between the established limits, per JEDEC standard No. 5.
T4-LDS-0155, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 3 of 6
1N935B-1 – 1N938B-1
GRAPHS
Pd, Rated Power
Dissipation (mW)
T
L
, Lead Temperature (C°) 3/8” from body
FIGURE 1
Power Derating Curve
Zener Impedance Z
ZT
(Ohms)
Operating Current I
Z
(mA)
FIGURE 2
Zener Impedance vs. Operating Current
T4-LDS-0155, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 4 of 6
1N935B-1 – 1N938B-1
GRAPHS
Change in Temperature Coefficient (%/°C)
Operating Current I
Z
(mA)
FIGURE 3
Typical Change of Temperature Coefficient with Change in Operating Current
T4-LDS-0155, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 5 of 6
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