11.7 Volt Temperature Compensated Zener
Reference Diodes
SCOTTSDALE DIVISION
1N941 thru 1N946B-1
WWW.Microsemi .COM 1N941 - 1N946B-1 941 - 1N946B-1
DESCRIPTION APPEARANCE
The popular 1N941 thru 1N946B series of Zero-TC Reference Diodes
provides a selection of 11.7 V nominal voltages and temperature
coefficients to as low as 0.0002%/oC for minimal voltage change with
temperature when operated at 7.5 mA. These glass axial-leaded DO-7
reference diodes are also available in JAN, JANTX, and JANTXV military
qualifications. Microsemi also offers numerous other Zener Reference
Diode products for a variety of other voltages from 6.2 V to 200 V.
DO-7
(DO-204AA)
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES APPLICATIONS / BENEFITS
• JEDEC registered 1N941 thru 1N946B series
• Standard reference voltage of 11.7 V +/- 5% with
tighter tolerances also available
• 1N941B, 942B, 943B, 944B, 945B also have military
qualification to MIL-PRF-19500/157 up to the
JANTXV level by adding JAN, JANTX, or JANTXV
prefixes to part numbers as well as “-1” suffix, e.g.
JANTX1N944B-1, etc.
• Internal metallurgical bonds
• JANS Equivalent available via SCD
• Radiation Hardened devices available by changing
“1N” prefix to “RH”, e.g. RH944B, RH945B, etc.
Also consult factory for “RH” data sheet brochure
• 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 0.0002%/ºC
• Tight reference voltage tolerances available at 11.7
V nominal values by adding the tolerance 1%, 2%,
3%, etc. after the part number for further
identification e.g. 1N944B-2%, 1N945A-1%,
1N944B-1-1%, etc.
• Flexible axial-lead mounting terminals
• Nonsensitive to ESD per MIL-STD-750 Method 1020
MAXIMUM RATINGS MECHANICAL AND PACKAGING
• Operating & StorageTemperature: -65oC to +175oC
• DC Power Dissipation: 500 mW @ TL = 25oC and
maximum current IZM of 39 mA. NOTE: For optimum
voltage-temperature stability, IZ = 7.5 mA (less than
95 mW in dissipated power)
• Solder temperatures: 260 oC for 10 s (maximum)
• CASE: Hermetically sealed glass case with DO-7
(DO-204AA) package
• TERMINALS: Tin-lead plated 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 (add
“TR” suffix to part number)
• WEIGHT: 0.2 grams.
• See package dimensions on last page
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
Copyright 2003
8-21-2003 REV A
11.7 Volt Temperature Compensated Zener
Reference Diodes
SCOTTSDALE DIVISION
1N941 thru 1N946B-1
WWW.Microsemi .COM 1N941 - 1N946B-1
*ELECTRICAL CHARACTERISTICS @ 25oC, unless otherwise specified
ZENER
VOLTAGE
VZ @ IZT
(Note 4)
ZENER
TEST
CURRENT
IZT
MAXIMUM
ZENER
IMPEDANCE
(Note 2)
ZZT @ IZT
MAXIMUM
REVERSE
CURRENT
IR @ 8 V
VOLTAGE
TEMPERATURE
STABILITY
(Note 3 & 4)
∆VZT
MAXIMUM
TEMPERATURE
RANGE
EFFECTIVE
TEMPERATURE
COEFFICIENT
αVZ
JEDEC
TYPE
NUMBER
(Note 1,
5 & 6)
VOLTS mA OHMS µA mV oC %/oC
1N941
1N941A
1N941B
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
1N942A
1N942B
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
1N943A
1N943B
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
1N944A
1N944B
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
1N945A
1N945B
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
1N946
1N946A
1N946B
11.12-12.28
11.12-12.28
11.12-12.28
7.5
7.5
7.5
30
30
30
15
15
15
1.8
3.6
4.7
0 to +75
-55 to +100
-55 to +150
0.0002
0.0002
0.0002
*JEDEC Registered Data.
NOTES:
1. For tighter voltages tolerances, add a hyphenated suffix to the part number for desired tolerance at the end of the part number, e.g.
1N944B-2%, 1N945B-1%, 1N944B-1-1%, etc.
2. Measured by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25oC.
3. 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.
4. Voltage measurements to be performed 15 seconds after application of dc current.
5. The 1N941B, 1N942B, 1N943B, 1N944B, 1N945B also have military qualification to MIL-PRF-19500/157 up to the JANTXV level by
adding JAN, JANTX, or JANTXV prefixes to part numbers as well as “-1” suffix, e.g. JANTX1N944B-1, JANTXV1N945B-1, etc.
6. Designate Radiation Hardened devices with “RH” prefix instead of “1N”, i.e. RH944B instead of 1N944B.
GRAPHS
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 7.5mA.
EXAMPLE: A diode in this series is operated at a current of
7.5mA and has specified Temperature Coefficient (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 6.0mA 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.
Change in temperature coefficient (%/oC)
IZ – Operating Current (mA)
FIGURE 1
TYPICAL CHANGE OF TEMPERATURE COEFFICIENT
WITH CHANGE IN OPERATING CURRENT.
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
Copyright 2003
8-21-2003 REV A
11.7 Volt Temperature Compensated Zener
Reference Diodes
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3
Copyright 2003
8-21-2003 REV A
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N941 thru 1N946B-1
1N 1 - 1N946B-1 1 - 1N946B-1
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.
∆VZ – Change in Zener Voltage (mV)
I
Z – Operating Current (mA)
FIGURE 2
TYPICAL CHANGE OF ZENER VOLTAGE
WITH CHANGE IN OPERATING CURRENT.
DIMENSIONS
9494
mm
All dimensions in INCH
