9.0 Volt Temperature Compensated Zener
Reference Diodes
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N935 thru 1N940B-1, e3
1N935 - 1N940B-1, e3
DESCRIPTION APPEARANCE
The popular 1N935 thru 1N94 0B series of Zero-TC Reference Diodes
provides a selection of 9.0 V nominal voltages and te mperature coefficients
to as low as 0.0002%/oC for minimal voltage change with tempe rature when
operated at 7.5 mA. These glass axial-leaded DO-7 reference diodes are
also available in JAN, JANTX, and JANTXV military qualifications. For
commercial applications it is also available as RoHS Compliant with an e3
suffix (not applicable to military). 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 APPLIC ATIONS / BENEFITS
• JEDEC registered 1N935 thru 1N940 series
• Standard reference voltage of 9.0V +/- 5%
• 1N935B, 937B, 938B, 939B, 940B also have military
qualification to MIL-PRF-195 00/156 up to the
JANTXV level by addin g JAN, JANTX, or JANTXV
prefixes to part numbers as well as “-1” suffix, e.g.
JANTX1N938B-1, etc.
• Internal metallurgical bonds
• JANS Equivalent available via SCD
• Radiation Hard ened devices available by changing
“1N” prefix to “RH”, e.g. RH938B, RH 940B, etc.
Also consult factory for “RH” data sheet brochure
• RoHS compliant devices available by adding an “e3”
suffix (not applicable to military)
• Provides minimal voltage changes over a broad
temperature range
• For instrumentation and other circuit designs requiring
a stable voltage reference
• Maximum temperature coefficient sel ection s available
from 0.01%/ºC to 0.0002%/ºC
• Tight voltage tolerances available with nominal
voltage of 9.2 V by adding tolerance 1%, 2%, 3%, etc.
after the part number for further identification, e.g.
1N938B-2%, 1N940B-1%, 1N939B-1-1%, etc.
• Flexible axial-leaded mo unting terminals
• Nonsensitive to ESD per MIL-STD-750 Method 1020
MAXIMUM RAT ING S MECHANICAL AND PACKAGING
• Operating & StorageTempera t ure: -65oC to +175oC
• DC Power Dissipation: 500 mW @ TL = 25oC and
maximum current IZM of 50 mA. NOTE: For optimum
voltage-temperature stabilit y, IZ = 7.5 mA (less than
75 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 (militar y) or RoHS
Compliant annealed matte-Tin plating and
solderable per MIL-STD-750, Method 2 02 6
• 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 l ast page
Microsemi
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7-18-2005 REV B 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
9.0 Volt Temperature Compensated Zener
Reference Diodes
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N935 thru 1N940B-1, e3
1N935 - 1N940B-1, e3
*ELECTRICAL CHARACTERISTICS @ 25oC, unless otherwise specified
ZENER
VOLTAGE
VZ @ IZT
(Notes
1, 4 & 5)
ZENER
TEST
CURRENT
IZT
MAXIMUM
ZENER
IMPEDANCE
(Note 2)
ZZT @ IZT
MAXIMUM
REVERSE
CURRENT
IR @ 6 V
VOLTAGE
TEMPERATURE
STABILITY
(Notes 3 & 4)
ΔVZT
MAXIMUM
TEMPERATURE
RANGE
EFFECTIVE
TEMPERATURE
COEFFICIENT
αVZ
JEDEC
TYPE
NUMBERS
(Notes
1 & 5)
VOLTS mA OHMS μA mV oC %/oC
1N935
1N935A
1N935B
8.55-9.45
8.55-9.45
8.55-9.45
7.5
7.5
7.5
20
20
20
10
10
10
67
139
184
0 to +75
-55 to +100
-55 to +150
0.01
0.01
0.01
1N936
1N936A
1N936B
8.55-9.45
8.55-9.45
8.55-9.45
7.5
7.5
7.5
20
20
20
10
10
10
33
69
92
0 to +75
-55 to +100
-55 to +150
0.005
0.005
0.005
1N937
1N937A
1N937B
8.55-9.45
8.55-9.45
8.55-9.45
7.5
7.5
7.5
20
20
20
10
10
10
13
27
37
0 to +75
-55 to +100
-55 to +150
0.002
0.002
0.002
1N938
1N938A
1N938B
8.55-9.45
8.55-9.45
8.55-9.45
7.5
7.5
7.5
20
20
20
10
10
10
6
13
18
0 to +75
-55 to +100
-55 to +150
0.001
0.001
0.001
1N939
1N939A
1N939B
8.55-9.45
8.55-9.45
8.55-9.45
7.5
7.5
7.5
20
20
20
10
10
10
3
7
9
0 to +75
-55 to +100
-55 to +150
0.0005
0.0005
0.0005
1N940
1N940A
1N940B
8.55-9.45
8.55-9.45
8.55-9.45
7.5
7.5
7.5
20
20
20
10
10
10
1.3
2.7
3.7
0 to +75
-55 to +100
-55 to +150
0.0002
0.0002
0.0002
*JEDEC Registered Data.
NOTES: 1. When ordering devices with tighter tolerances than specified, use a nominal voltage of 9.2V and add a hyphenated suffix
to the part number for desired tolerance at the end of the part number, e.g. 1N938B-2%, 1N939B-1%, 1N939B-1-1%, etc.
2. Measured by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25 oC.
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 1N935B, 937B, 938B, 939B, 940B also have military qualification to MIL-PRF-19500/156 up to the JANTXV level by
adding JAN, JANTX, or JANTXV prefixes to part numbers as well as “-1” suffix, e.g. JANTX1N938B-1, etc.
6. Designate Radiation Hardened devices with “RH” prefix instead of “IN”, i.e. RH938A instead of 1N938A.
GRAPHS
Change in temperature coefficient (mV/oC)
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7-18-2005 REV B
IZ – Operating Current (mA)
Change in temperature coefficient (%/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 +/-
0.005%/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 +/-
0.005%oC and –0.0009%/oC gives the new estimated limits of
+0.0041%/oC and -0.0059%/oC.
FIGURE 1
TYPICAL CHANGE OF TEMPERATURE COEFFICIENT
WITH CHANGE IN OPERATING CURRENT.
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
9.0 Volt Temperature Compensated Zener
Reference Diodes
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N935 thru 1N940B-1, e3
1N935 - 1N940B-1, e3
ΔVZ – 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.
DIMENSIONS
All dimensions in INCH
mm
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Copyright © 2005
7-18-2005 REV B 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
