1N941-1 thru 1N945B-1
11.7 Volt Temperature Compensated
Zener Reference Diodes
Qualified per MIL-PRF-19500/157
DESCRIPTION
The popular 1N941-1 thru 1N945B-1 series of zero-TC reference diodes provides a selection
of 11.7 V nominal voltages and temperature coefficients to as low as 0.0002 %/
o
C for minimal
voltage change with temperature when operated at 7.5 mA. The “B” version of these glass,
axial-leaded DO-35 reference diodes are also available in JAN, JANTX, JANTXV, and JANS
military qualifications. Microsemi also offers numerous other Zener reference diode products
for a variety of other voltages from 6.2 V to 200 V.
Available on
commercial
versions
Qualified Levels:
JAN, JANTX,
JANTXV and JANS
(available on some part
numbers)
Important:
For the latest information, visit our website
http://www.microsemi.com.
FEATURES
•
•
•
•
•
JEDEC registered 1N941 thru 1N945 series.
Standard reference voltage of 11.7 V +/- 5% with tighter reference tolerances of 1%, 2%, and 3%
available on commercial level only.
Internal metallurgical bond.
JAN, JANTX, JANTXV, and JANS qualification per MIL-PRF-19500/157 available for 1N941B-1,
1N943B-1, 1N944B-1, and 1N945B-1.
RoHS compliant versions available (commercial grade only).
DO-35
(DO-204AH)
Package
Also available in:
DO-213AA
(surface mount)
1N941UR-1 thru 1N945BUR-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 0.0005 %/ºC.
Flexible axial-lead mounting terminals.
Non-sensitive to ESD per MIL-STD-750 method 1020.
MAXIMUM RATINGS
Parameters/Test Conditions
Power Dissipation @ T
A
= +25 C and maximum
(1, 2)
current I
ZM
of 39 mA.
Junction and Storage Temp
Maximum Zener Current
Solder Temperature @ 10 s
o
Symbol
P
D
T
J
and
T
STG
I
ZM
T
SP
Value
500
-55 to +175
39
260
Unit
mW
o
C
mA
o
C
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
Tel: 1-800-446-1158 or
(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
Notes:
1. For optimum voltage-temperature stability, I
Z
= 7.5 mA (less than 95 mW in dissipated power).
2. Derate at 3.33 mW/
o
C above T
A
= +25
o
C.
LDS-0222, Rev. 1 (111515)
©2011 Microsemi Corporation
Page 1 of 6
1N941-1 thru 1N945B-1
MECHANICAL and PACKAGING
•
•
•
•
•
•
•
CASE: Hermetically sealed glass case with axial DO-35 (DO-204AH) package.
TERMINALS: Tin-lead plated or RoHS compliant matte-tin plating available (on commercial grade only) and solderable per MIL-
STD-750, method 2026.
MARKING: Part number and cathode band.
POLARITY: Reference diode to be operated with the banded end positive with respect to the opposite end.
TAPE & REEL option: Standard per EIA-296. Consult factory for quantities. (Add “TR” suffix to part number.)
WEIGHT: 0.2 grams.
See
Package Dimensions
on the last page.
PART NOMENCLATURE
Applicable to: JAN, JANTX, JANTXV and JANS level 1N941B, 1N943B, 1N944B, and 1N945B only:
JAN
Reliability Level
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
JEDEC type number
(See
Electrical Characteristics
table)
1N941
B
-1
Metallurgically Bonded
Temperature Coefficient
o
o
range of -55 C to +150 C
Applicable to: commercial level 1N941 thru 1N945B:
1N941
JEDEC type number
(See
Electrical Characteristics
table)
Temperature Coefficient
range:
o
o
A = -55 C to +100 C
o
o
B = -55 C to +150 C
o
o
Blank = 0 C to +75 C
A
-1
-1%
(e3)
RoHS Compliance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Tighter Reference Tolerance
1%
2%
3%
Blank = 5%
Metallurgically Bonded
LDS-0222, Rev. 1 (111515)
©2011 Microsemi Corporation
Page 2 of 6
1N941-1 thru 1N945B-1
SYMBOLS & DEFINITIONS
Definition
Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature.
Regulator Current: The dc regulator current (I
Z
), at a specified test point (I
ZT
), near breakdown knee (I
ZK
).
Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating.
Zener Voltage: The Zener voltage the device will exhibit at a specified current (I
Z
) in its breakdown region.
Zener Voltage Temperature.
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.
Symbol
I
R
I
Z
, I
ZT
, I
ZK
I
ZM
V
Z
V
ZT
Z
ZT
or Z
ZK
ELECTRICAL CHARACTERISTICS
@ 25
o
C unless otherwise specified
ZENER
VOLTAGE
V
Z
@ I
ZT
(Note 3)
ZENER
TEST
CURRENT
I
ZT
MAXIMUM
ZENER
IMPEDANCE
Z
ZT
@ I
ZT
(Note 1)
MAXIMUM
REVERSE
CURRENT
I
R
@ 8 V
VOLTAGE
TEMPERATURE
STABILITY
∆V
ZT
MAXIMUM
(Note 2 & 3)
TEMPERATURE
RANGE
EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
JEDEC
TYPE
NUMBER
(Note 4)
1N941-1
1N941A-1
1N941B-1
1N942-1
1N942A-1
1N942B-1
1N943-1
1N943A-1
1N943B-1
1N944-1
1N944A-1
1N944B-1
1N945-1
1N945A-1
1N945B-1
Volts
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
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
7.5
7.5
7.5
Ohms
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
μA
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
mV
88
181
239
44
90
120
18
36
47
9
18
24
4
9
12
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
0 to +75
-55 to +100
-55 to +150
o
%/ C
0.01
0.01
0.01
0.005
0.005
0.005
0.002
0.002
0.002
0.001
0.001
0.001
0.0005
0.0005
0.0005
o
*JEDEC Registered Data.
NOTES:
1.
2.
3.
4.
Measured by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25 C.
The maximum allowable change observed over the entire temperature range i.e., the diode voltage will not exceed the specified mV
change at any discrete temperature between the established limits.
Voltage measurements to be performed 15 seconds after application of dc current.
The 1N941B-1, 1N943B-1, 1N944B-1, and 1N945B-1 only are military qualified to MIL-PRF-19500/157 up to the JANS level.
o
LDS-0222, Rev. 1 (111515)
©2011 Microsemi Corporation
Page 3 of 6
1N941-1 thru 1N945B-1
GRAPHS
Change in temperature coefficient (mV/
o
C)
Change in temperature coefficient (%/
o
C)
The curve shown in Figure 1 is typical of the diode
series and greatly simplifies the estimation of the
Temperature Coefficient (TC) when the diode is
operated at currents other than 7.5 mA.
EXAMPLE: A diode in this series is operated at a
current of 7.5 mA and has specified Temperature
Coefficient (TC) limits of +/-0.002 %/
o
C. To obtain
the typical Temperature Coefficient limits for this
same diode operated at a current of 6.0mA, the
o
new TC limits (%/ C) can be estimated using the
graph in Figure 1.
At a test current of 6.0 mA the change in
Temperature Coefficient (TC) is approximately –
o
o
0.0009 %. C. The algebraic sum of +/-0.002 % C
and –0.0009 %/
o
C gives the new estimated limits of
+0.0011 %/oC and -0.0029 %/oC.
I
Z
– Operating Current (mA)
FIGURE 1
TYPICAL CHANGE OF TEMPERATURE COEFFICIENT
WITH CHANGE IN OPERATING CURRENT
∆V
Z
– Change in Zener Voltage (mV)
This curve in Figure 2 illustrates the change of
diode voltage arising from the effect of
impedance. It is in effect, an exploded view of
the Zener operating region of the I-V
characteristic.
In conjunction with Figure 1, this curve can be
used to estimate total voltage regulation under
conditions of both varying temperature and
current.
I
Z
– Operating Current (mA)
FIGURE 2
TYPICAL CHANGE OF ZENER VOLTAGE
WITH CHANGE IN OPERATING CURRENT
LDS-0222, Rev. 1 (111515)
©2011 Microsemi Corporation
Page 4 of 6
1N941-1 thru 1N945B-1
GRAPHS
600
500
400
300
200
100
0
0
25
50
75
100 125 150
T
L
, Ambient temperature (°C)
175
P
D
, Rated Power
Dissipation (mW)
FIGURE 3
POWER DERATING CURVE
Zener Impedance Z
ZT
(ohms)
Operating Current l
ZT
(mA)
FIGURE 4
TYPICAL ZENER IMPEDANCE VS. OPERATING CURRENT
LDS-0222, Rev. 1 (111515)
©2011 Microsemi Corporation
Page 5 of 6
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