1N935 thru 1N940B-1, e3
9.0 Volt Temperature Compensated Zener
Reference Diodes
SCOTTSDALE DIVISION
DESCRIPTION
The popular 1N935 thru 1N940B series of Zero-TC Reference Diodes
provides a selection of 9.0 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. 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.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
APPEARANCE
WWW .
Microsemi
.C
OM
DO-7
(DO-204AA)
FEATURES
•
•
•
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-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.
Internal metallurgical bonds
JANS Equivalent available via SCD
Radiation Hardened 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)
•
•
•
•
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 0.0002%/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 mounting terminals
Nonsensitive to ESD per MIL-STD-750 Method 1020
•
•
•
•
•
•
MAXIMUM RATINGS
•
•
Operating & StorageTemperature: -65
o
C to +175
o
C
DC Power Dissipation: 500 mW @ T
L
= 25
o
C and
maximum current I
ZM
of 50 mA. NOTE: For optimum
voltage-temperature stability, I
Z
= 7.5 mA (less than
75 mW in dissipated power)
o
Solder temperatures: 260 C for 10 s (maximum)
•
•
MECHANICAL AND PACKAGING
CASE: Hermetically sealed glass case with DO-7
(DO-204AA) package
TERMINALS: Tin-lead (military) or RoHS
Compliant annealed matte-Tin plating 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
1N935 - 1N940B-1, e3
•
•
•
•
•
•
Copyright
©
2005
7-18-2005 REV B
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
1N935 thru 1N940B-1, e3
9.0 Volt Temperature Compensated Zener
Reference Diodes
SCOTTSDALE DIVISION
*ELECTRICAL CHARACTERISTICS @ 25
o
C, unless otherwise specified
JEDEC
TYPE
NUMBERS
(Notes
1 & 5)
ZENER
VOLTAGE
V
Z
@ I
ZT
(Notes
1, 4 & 5)
ZENER
TEST
CURRENT
I
ZT
MAXIMUM
ZENER
IMPEDANCE
(Note 2)
Z
ZT
@ I
ZT
MAXIMUM
REVERSE
CURRENT
I
R
@ 6 V
VOLTAGE
TEMPERATURE
STABILITY
(Notes 3 & 4)
ΔV
ZT
MAXIMUM
TEMPERATURE
RANGE
o
WWW .
Microsemi
.C
OM
EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
1N935
1N935A
1N935B
1N936
1N936A
1N936B
1N937
1N937A
1N937B
1N938
1N938A
1N938B
1N939
1N939A
1N939B
1N940
1N940A
1N940B
VOLTS
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
8.55-9.45
8.55-9.45
8.55-9.45
8.55-9.45
8.55-9.45
8.55-9.45
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
7.5
7.5
7.5
OHMS
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
μA
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
mV
67
139
184
33
69
92
13
27
37
6
13
18
3
7
9
1.3
2.7
3.7
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
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
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
2.
3.
4.
to the part number for desired tolerance at the end of the part number, e.g. 1N938B-2%, 1N939B-1%, 1N939B-1-1%, etc.
o
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 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.
Designate Radiation Hardened devices with “RH” prefix instead of “IN”, i.e. RH938A instead of 1N938A.
5.
6.
GRAPHS
Change in temperature coefficient (%/ C)
Change in temperature coefficient (mV/ C)
o
o
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.
1N935 - 1N940B-1, e3
EXAMPLE: A diode in this series is operated at a current of
7.5mA and has specified Temperature Coefficient (TC) limits of +/-
o
0.005%/ C. To obtain the typical Temperature Coefficient limits for
this same diode operated at a current of 6.0mA, the new TC limits
o
(%/ C) can be estimated using the graph in FIGURE 1.
At a test current of 6.0mA the change in Temperature Coefficient
o
(TC) is approximately –0.0009%. C. The algebraic sum of +/-
o
o
0.005% C and –0.0009%/ C 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.
Copyright
©
2005
7-18-2005 REV B
I
Z
– Operating Current (mA)
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
1N935 thru 1N940B-1, e3
9.0 Volt Temperature Compensated Zener
Reference Diodes
SCOTTSDALE DIVISION
WWW .
Microsemi
.C
OM
Δ
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.
DIMENSIONS
1N935 - 1N940B-1, e3
All dimensions in INCH
mm
Copyright
©
2005
7-18-2005 REV B
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3
Microchip MCU
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