Copyright © 2005
10-18-2005 REV C
IMPORTANT: For the most current data, consult MICROSEMI’s website:
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. These glass axial-leaded DO-35 Zeners are
also optionally available with an internal-metallurgical-bond option by
adding a “-1” suffix as well as RoHS Compliant by adding an “e3” suffix.
Microsemi also offers numerous other Zener products to meet higher and
lower power applications.
• JEDEC registered 1N957B(-1) to 1N992B(-1) series
• Internal metallurgical bond option available by adding a
• Surface Mount equivalents available as MLL957B to
• RoHS Compliant devices available by adding “e3” suffix
• DO-7 glass body axial-leaded Zener equivalents are also
• Operating and Storage temperature: -65
• Thermal Resistance: 250
• Steady-State Power: 0.5 watts at T
• Forward voltage @200 mA: 1.1 volts (maximum) for
• Solder Temperatures: 260
“-1” suffix (similar to military product)
MLL992B or with “-1” suffix for bonded in the DO-213AA
MELF style package (consult factory for others)
available
(10 mm) lead length from body, or 310
ambient when mounted on FR4 PC board (1 oz Cu)
with 4 mm
25 mm
(10 mm) from body or 0.48 W at T
mounted on FR4 PC board as described for thermal
resistance above (also see Figure1)
1N957B – 1N985B and 1.3 V for 1N985 – 1N992B
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
2
MAXIMUM RATINGS
copper pads and track width 1 mm, length
S C O T T S D A L E D I V I S I O N
FEATURES
º
C/W junction to lead at 3/8
º
DESCRIPTION
C for 10 s (max)
A
< 25
L
< 50
º
C/W junction to
º
C when
º
C to +175
o
C 3/8 inch
Scottsdale Division
Microsemi
º
C
1N957B, -1 thru 1N992B, -1, e3 DO-35
http://www.microsemi.com
MECHANICAL AND PACKAGING
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Silicon 500 mW Zener Diodes
Regulates voltage over a broad operating
current and temperature range
Extensive selection from 6.8 to 200 V
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
Flexible axial-lead mounting terminals
Nonsensitive to ESD per MIL-STD-750 Method
1020
Minimal capacitance (see Figure 3)
Inherently radiation hard as described in
Microsemi MicroNote 050
CASE: Hermetically sealed axial-lead glass
DO-35 (DO-204AH) package
TERMINALS: Tin-Lead (Sn/Pb) 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)
WEIGHT: 0.2 grams
See package dimensions on last page
APPLICATIONS / BENEFITS
DO-35
(DO-204AH)
APPEARANCE
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