1N957B, -1 thru 1N992B, -1, e3 DO-35
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
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.
DO-35
(DO-204AH)
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES
APPLICATIONS / BENEFITS
•
•
JEDEC registered 1N957B(-1) to 1N992B(-1) series
•
Regulates voltage over a broad operating
current and temperature range
Internal metallurgical bond option available by adding a
“-1” suffix (similar to military product)
•
•
Extensive selection from 6.8 to 200 V
•
Surface Mount equivalents available as MLL957B to
MLL992B or with “-1” suffix for bonded in the DO-213AA
MELF style package (consult factory for others)
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
•
•
RoHS Compliant devices available by adding “e3” suffix
DO-7 glass body axial-leaded Zener equivalents are also
available
•
•
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 RATINGS
MECHANICAL AND PACKAGING
• Operating and Storage temperature: -65ºC to +175ºC
•
CASE: Hermetically sealed axial-lead glass
DO-35 (DO-204AH) package
• 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 copper 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 Figure1)
•
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)
• Forward voltage @200 mA: 1.1 volts (maximum) for
1N957B – 1N985B and 1.3 V for 1N985 – 1N992B
•
•
WEIGHT: 0.2 grams
• Solder Temperatures: 260 ºC for 10 s (max)
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