PDF 1N990B Data sheet ( Hoja de datos )

Número de pieza	1N990B
Descripción	Silicon 500mW Zener Diodes
Fabricantes	Microsemi
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No Preview Available ! SCOTTSDALE DIVISION 1N957B, -1 thru 1N992B, -1, e3 DO-35 Silicon 500 mW Zener Diodes DESCRIPTION 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. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com APPEARANCE DO-35 (DO-204AH) FEATURES • 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 available as MLL957B to MLL992B or with “-1” suffix for bonded in the DO-213AA MELF style package (consult factory for others) • RoHS Compliant devices available by adding “e3” suffix • DO-7 glass body axial-leaded Zener equivalents are also available APPLICATIONS / BENEFITS • 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 MAXIMUM RATINGS • 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 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) • 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) MECHANICAL AND PACKAGING • 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 Copyright © 2005 10-18-2005 REV C Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 1 1 page

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