Silicon 500 mW Zener Diodes
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
Copyright © 2005
10-18-2005 REV C
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N957B, -1 thru 1N992B, -1, e3 DO-35
1N957B – 992B, e3
(DO-35) DO-35)
DESCRIPTION APPEARANCE
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 appli cation s.
DO-35
(DO-204AH)
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES APPLIC ATIONS / BENEFITS
• JEDEC registered 1N957B(-1) to 1N992B(-1) series
• Internal metallurgical bond option available by adding a
“-1” suffix (similar to military product)
• Surface Mount equivalents availa ble as MLL957B to
MLL992B or with “-1” suffix for bonded i n the DO-213AA
MELF style package (consult factory for others)
• RoHS Compliant devices avai lable by adding “e3” suffix
• DO-7 glass body axial-leaded Zener equivalents are also
available
• Regulates voltage over a broad operating
current and temperature range
• Extensive selection from 6.8 to 200 V
• Standard voltage toleranc es are plus/minus 5%
with B suffix, 10 % with A suffix identification
• Tight tolerances available in plus or min us 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
MAXIMUM RAT ING S MECHANICAL AND PACKAGING
• Operating and Storage temperature: -65ºC to +175ºC
• Thermal Resistance: 250 ºC/W junction to lead at 3/8
(10 mm) lead length from body, or 310ºC/W junction to
ambient when mounted on FR4 PC board (1 oz Cu)
with 4 mm2 cop per pads and track width 1 mm, length
25 mm
• Steady-State Power: 0.5 watts at TL < 50oC 3/8 inch
(10 mm) from body or 0.48 W at TA < 25ºC when
mounted on FR4 PC board as described for thermal
resistance above (also see F igure1)
• 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)
• 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. Dio de
to be operated with the bande d end p ositive 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 l ast page