LDS-0222, Rev. 1 (111515) ©2011 Microsem i Corporation Page 1 of 6
1N941-1 thru 1N945B-1
Available on
commercial
versions
11.7 Volt Temperature Compensated
Zener Reference Diodes
Qualified per MIL-PRF-19500/157
Quali f i ed Levels:
JAN, J AN TX,
JANTXV and JANS
(available on some part
numbers)
DESCRIPTION
The popular 1N941-1 thr u 1N 9 45B-1 series of zero-TC reference diodes pr ovides a select ion
of 11.7 V nomi nal voltages and temper ature coefficien ts t o as low as 0.0002 %/oC for minimal
vol tage chang e with temperature when oper ated at 7.5 mA. The “ B” vers ion of t hese glass,
axial-leaded D O-35 referenc e di odes are al so available in JAN , JA N TX, JANTXV, a nd J AN S
mil it ar y quali fications. Micros emi al so off er s numerous ot her Zener reference diode products
for a var i ety of other voltages from 6. 2 V to 200 V.
DO-35 (DO-204AH)
Package
Also available in:
DO-213AA
(s urf ace mount)
1N941UR-1 th r u 1N945BUR-1
Important: For the la test information , visit our website http://www.microsemi.com.
FEATURES
• JEDEC registered 1N941 thru 1N945 series.
• Standard reference voltage of 11.7 V +/- 5% with t ighter reference tolerances of 1%, 2%, and 3%
available on commercial level onl y.
• I nter nal meta llurgi cal bond.
• JAN, JANTX, JANTXV, and JANS qualification per MIL-PRF-19500/157 available for 1N941B-1,
1N943B-1, 1N944B-1, and 1N945B-1.
• RoHS compl iant versions avai lable (commercial grade only).
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 selecti ons available from 0.01 %/ºC to 0.0005 %/ºC.
• Flexible axial-lead mounti ng terminals.
• Non-sensitive to ESD per MIL-STD-750 method 1020.
MAXIMUM RATINGS
MSC – Lawrence
6 Lake Street,
Lawrence, M A 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
Parameters/Test Conditions
Symbol
Value
Unit
Power Di ssipation @ TA = +25
o
C and maximum
current IZM of 39 mA.
(1, 2)
PD 500 mW
Junction and Storage Temp TJ and
TSTG
-55 to +175
o
C
Maximum Zener Current
IZM
39
mA
Solder Temperature @ 10 s
TSP
260
oC
Notes: 1. For optimum voltage-temperature stability, IZ = 7.5 mA (less than 95 mW in dissipated power).
2. Derate at 3.33 mW/oC above TA = +25 oC.
LDS-0222, Rev. 1 (111515) ©2011 Microsemi Corporation Page 2 of 6
1N941-1 thru 1N945B-1
• CASE: Hermetically sealed glass case with axial DO-35 (DO-204AH) package.
• TERMINALS: Tin-l ead plated or RoHS co mpl iant matte-ti n 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 pos itive with respect to the opposite end.
• TAPE & REEL option: Standard per EIA-296. Consul t factory for quantities. (Add “TR” suffix to part number.)
• WEIGHT: 0.2 grams.
• See Package Dimensions on the last page.
Appl icabl e to: JAN, JANTX, JANTXV and JANS l evel 1N941B, 1N943B, 1N944B, and 1N945B only:
JAN 1N941 B -1
Reliability Level
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
JEDEC type nu m ber
(See Electrical Characteristics
table)
Metallurgically Bonded
Temperature Coefficient
range of -55 oC to +150 oC
Appl icabl e to: commercial l ev el 1N941 thru 1N945B:
1N941 A -1 -1% (e3)
JEDEC type nu m ber
(See
Electrical Characteristics
table)
Temperature Coefficient
range:
A = -55 oC to +100 oC
B = -55 oC to +150 oC
Blank = 0 oC to +75 oC
RoHS Complianc e
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 3 of 6
1N941-1 thru 1N945B-1
SYMBOLS & DEFI NITIONS
Symbol
Definition
IR
Reverse Current: The maximum revers e (leakage) current that will flow at the specified vol tage and temperature.
IZ, IZT, IZK
Regulator Current: The dc regulator current (IZ), at a specified tes t point (IZT), near breakdown knee (IZK).
IZM
Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating.
VZ
Zener Voltage: The Zener voltage the device will exhibit at a specified current (IZ) in its breakdown region.
VZT
Zener Voltage Temperature.
ZZT or ZZK
Dynamic Impedance: The sm all signal impedance of the di ode when biased to operate in i ts breakdown region at a
specified rms current modulation (typicall y 10% of IZT o r IZK ) and superimposed on IZT or I ZK respectively.
JEDEC
TYPE
NUMBER
(Note 4)
ZENER
VOLTAGE
VZ @ I ZT
(Note 3)
ZENER
TEST
CURRENT
IZT
MAXIMUM
ZENER
IMPEDANCE
ZZT @ IZT
(Note 1)
MAXIMUM
REVERSE
CURRENT
IR @ 8 V
VOLTAGE
TEMPERATURE
STABILITY
∆
VZT
MAXIMUM
(Note 2 & 3)
TEMPERATURE
RANGE
EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
Volts
mA
Ohms
μA
mV
oC
% / oC
1N941-1
1N941A-1
1N941B-1
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
7.5
7.5
7.5
30
30
30
15
15
15
88
181
239
0 to +75
-55 to +100
-55 to +150
0.01
0.01
0.01
1N942-1
1N942A-1
1N942B-1
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
7.5
7.5
7.5
30
30
30
15
15
15
44
90
120
0 to +75
-55 to +100
-55 to +150
0.005
0.005
0.005
1N943-1
1N943A-1
1N943B-1
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
7.5
7.5
7.5
30
30
30
15
15
15
18
36
47
0 to +75
-55 to +100
-55 to +150
0.002
0.002
0.002
1N944-1
1N944A-1
1N944B-1
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
7.5
7.5
7.5
30
30
30
15
15
15
9
18
24
0 to +75
-55 to +100
-55 to +150
0.001
0.001
0.001
1N945-1
1N945A-1
1N945B-1
11.12 - 12.28
11.12 - 12.28
11.12 - 12.28
7.5
7.5
7.5
30
30
30
15
15
15
4
9
12
0 to +75
-55 to +100
-55 to +150
0.0005
0.0005
0.0005
*JEDEC Registered Data.
NOTES: 1. Measur ed by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25 oC.
2. The max imum all owable 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.
3. Voltage measurements to be performed 15 seconds after application of dc current.
4. T he 1N941B -1, 1N943B-1, 1N94 4B -1, and 1N945B-1 only are military qualified to MIL-PRF-19500/157 up to the JANS level.
LDS-0222, Rev. 1 (111515) ©2011 Microsemi Corporation Page 4 of 6
1N941-1 thru 1N945B-1
IZ – Operating Current (m A)
FIGURE 1
TYPICAL CHANGE OF TEMPERATURE COEFFICIENT
WITH CHANGE IN OPERA TING CURRENT
IZ – Operating Current (mA)
FI GURE 2
TYPI CAL CHANGE OF ZENER VOLTAGE
WITH CHANGE IN OPERATING CURRENT
Change in temperature coefficient (%/oC)
Change in temperature coefficient (mV/oC)
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
Coe fficient (TC) limits of +/-0.002 %/oC. To obtain
the typical Temperature Coefficient limits for this
same diode operated at a current of 6.0mA, the
new TC limits (%/oC) 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 –
0.0009 %.oC. The algebraic sum of +/-0.002 %oC
and –0.0009 %/oC gives the new estimated limits of
+0.0011 %/oC and -0.0029 %/oC.
∆V
Z
– Change in Zener Voltage (mV)
This curve in Figure 2 illustrates the change of
diode voltage arising from the eff ect 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.
LDS-0222, Rev. 1 (111515) ©2011 Microsemi Corporation Page 5 of 6
1N941-1 thru 1N945B-1
600
500
400
300
200
100
0
0 25 50 75 100 125 150 175
TL, Ambient t em per ature ( °C)
FIGURE 3
POW ER DE RATI NG CURVE
Operating Current lZT (mA)
FIGURE 4
TYPICAL ZENER IMPEDANCE VS. OPERATING CURRENT
P
D
, Rated Power
Dissipation (mW)
Ze ner Impedance Z
ZT
(ohms)
LDS-0222, Rev. 1 (111515) ©2011 Microsemi Corporation Page 6 of 6
1N941-1 thru 1N945B-1
Symbol
Dimensions
Notes
Inch
Millimeters
Min
Max
Min
Max
BD
0.600
0.107
1.52
2.72
3
BL
0.120
0.300
3.05
7.62
3
LD
0.018
0.023
0.46
0.58
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 general information only.
3. Package contour optional within BD and lengt h BL. Heat slug s, if any, shall be included within this cylinder but shall not be
subject to minimum limit of BD.
4. Within this zone, lead diamet er may vary to allow for lead finishes and irregularities, other than heat slugs.
5. In accordance with ASME Y14.5M, diameters are equivalent to ΦX symbology.