1N957B thru 1N992B, e3 DO-7
Silicon 500 mW Zener Diodes
S C O T T S D A L E D I V I S I O N
DESCRIPTION
APPEARANCE
DO-7
The popular 1N957B thru 1N992B series of 0.5 watt Zener voltage regulators
provides a selection from 6.8 to 200 volts in standard 5% or 10% tolerances
as well as tighter tolerances identified by different suffix letters on the part
number. The somewhat larger DO-7 packaging option offers a “straight-
through” soldered internal connection with a larger active die element than
otherwise provided in the smaller DO-35 package when needed. Microsemi
also offers numerous other Zener products to meet higher and lower power
applications.
(DO-204AA)
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES
APPLICATIONS / BENEFITS
•
•
JEDEC registered 1N957B to 1N992B series
•
Regulates voltage over a broad operating current
and temperature range
Internal metallurgical bonding equivalent to “-1” suffix
identification on other military DO-7 Zeners
•
•
Extensive selection from 6.8 to 200 V
•
Options for screening in accordance with MIL-PRF-
19500 for JAN, JANTX, JANTXV, and JANS are
available by adding MQ, MX, MV, or MSP prefixes
respectively to part numbers.
Standard voltage tolerances are plus/minus 5%
with B suffix, 10 % with A suffix identification
•
Tight tolerances available in plus or minus 2% or
1% with C or D suffix respectively
•
Surface mount equivalents in DO-213AA also
available as MLL957B to MLL992B or with “-1” suffix
(consult factory for other surface mount options)
•
•
•
•
Flexible axial-lead mounting terminals
Nonsensitive to ESD
Capacitance also specified (see Figure 3)
•
•
RoHS Compliant devices available by adding e3 suffix
Inherently radiation hard as described in
Microsemi MicroNote 050
Smaller DO-35 glass body axial-leaded Zener
equivalents are also available
MAXIMUM RATINGS
MECHANICAL AND PACKAGING
•
•
Operating and Storage temperature: -65ºC to +175ºC
•
•
CASE: Hermetically sealed axial-lead glass DO-7
(DO-204AA) package
Thermal Resistance: 300 ºC/W junction to lead at 3/8
(10 mm) lead length from body, or 360ºC/W junction
to ambient when mounted on FR4 PC board (1 oz
Cu) with 4 mm2 copper pads and track width 1 mm,
length 25 mm
Steady-State Power: 0.5 watts at TL < 25oC 3/8 inch
(10 mm) from body or 0.417 W at TA < 25ºC when
mounted on FR4 PC board as described for thermal
resistance above (also see Figure1)
TERMINALS: Tin-Lead or RoHS Compliant
annealed matte-Tin plating solderable per MIL-
STD-750, method 2026
•
POLARITY: Cathode indicated by band. Diode to
be operated with the banded end positive with
respect to the opposite end for Zener regulation
•
•
•
MARKING: Part number
TAPE & REEL option: Standard per EIA-296 (add
“TR” suffix to part number)
•
•
Forward voltage @200 mA: 1.1 volts (maximum) for
1N957B – 1N985B and 1.3 V for 1N985 – 1N992B
Solder Temperatures: 260 ºC for 10 s (max)
•
•
WEIGHT: 0.2 grams
See package dimensions on last page
Copyright © 2005
10-18-2005 REV C
Microsemi
Page 1
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
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