1N957BUR-1 – 1N992BUR-1
Silicon MELF 500 mW Zener Diodes
Qualified per MIL-PRF-19500/117
The popular 1N957BUR-1 through 1N992BUR-1 series of 0.5 watt Zener voltage regulators
provides a selection from 6.8 to 200 volts in a standard 5%, 2% and 1% tolerance versions.
These glass MELF DO-213AA Zeners feature an internal metallurgical bond and are available
in military qualified and commercial RoHS compliant versions. Military qualified versions are
available on the 1N962BUR-1 through 1N992BUR-1 range of part numbers.
JAN, JANTX, and
Important: For the latest information, visit our website http://www.microsemi.com.
• JEDEC registered 1N957B to 1N992B number series.
• Internal metallurgical bond.
• *JAN, JANTX, and JANTXV qualifications are available per MIL-PRF-19500/117 for part numbers
1N962BUR-1 through 1N992BUR-1.
• Upscreening is available in reference to MIL-PRF-19500 for the range of 1N957BUR-1 through
1N961BUR-1. (See part nomenclature for all available options.)
• RoHS compliant versions available (commercial grade only).
APPLICATIONS / BENEFITS
• Regulates voltage over a broad operating current and temperature range.
• Extensive selection from 6.8 to 200 V.
• Standard voltage tolerance is ± 5% with optional tighter tolerances of ± 2% or 1%.
• Small size for high density mounting using the surface mount method (see package illustration).
• Non-sensitive to ESD per MIL-STD-750 method 1020.
• Minimal capacitance.
• Inherently radiation hard as described in Microsemi MicroNote 050.
Operating and Storage Temperature
Thermal Resistance Junction-to-End Cap
Thermal Resistance Junction-to-Ambient when
mounted on PCB (1)
TJ and TSTG
-65 to +175
Steady-State Power Dissipation
@ TEC = +125°C (2)
@ TA = 55°C mounted on PCB
Forward Voltage @ IF = 200 mA
1N957UR – 1N985UR
1N986UR – 1N992UR
Solder Temperature @ 10 s
PD 0.5 W
VF 1.1 V
TSP 260 oC
NOTES: 1. See figure 1 for derating curves. TA = +75°C on an FR4 PC board with 1 oz copper metalization.
2. Derate to 0 at +175°C.
Also available in:
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
Tel: 1-800-446-1158 or
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
T4-LDS-0287-1, Rev. 1 (121795)
©2012 Microsemi Corporation
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