DESCRIPTION The popular 1N957B thru 1N992B series of 0.5 watt Zener Voltage Regulators provides a selection from to 200 volts in standard 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 available with an internal-metallurgical-bond option by adding a "-1" suffix. The 1N962B-1 thru 1N992B-1 are available in JAN, JANTX, and JANTXV military qualifications. Microsemi also offers numerous other Zener products to meet higher and lower power applications.

JEDEC registered to 1N992B(-1) series Internal metallurgical bond option available by adding a "-1" suffix Also available in JAN, JANTX, and JANTXV qualifications per MIL-PRF-19500/117 by adding the JAN, JANTX, or JANTXV prefixes to part numbers for desired level of screening as well as "-1" suffix; (e.g. JANTX1N962B-1, JANTXV1N986C-1, etc.) Military Surface Mount equivalents also available DO-213AA by adding a UR-1 suffix in addition to the JAN, JANTX, and JANTXV prefix; e.g. JANTX1N962BUR-1 (see separate data sheet) Commercial Surface Mount equivalents available MLL992B or with "-1" suffix for bonded in the DO-213AA MELF style package (consult factory for others) DO-7 glass body axial-leaded Zener equivalents are also available

Regulates voltage over a broad operating current and temperature range Extensive selection from 200 V Standard voltage tolerances are plus/minus 5% with B suffix, 10 % with A suffix identification Tight tolerances available in plus or minus or 1% with 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

Operating and Storage temperature: to +175�C Thermal Resistance: 250 �C/W junction to lead 3/8 (10 mm) lead length from body, or 310�C/W junction to ambient when mounted 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 50oC 3/8 inch (10 mm) from body < 25�C when mounted FR4 PC board as described for thermal resistance above (also see Figure1) Forward voltage @200 mA: 1.1 volts (maximum) for � 1N985B and 1.3 V for � 1N992B Solder Temperatures: 260 �C for 10 s (max)

CASE: Hermetically sealed axial-lead glass DO-35 (DO-204AH) package TERMINALS: Leads, tin-lead plated 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

Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

NOTE 1: The JEDEC type numbers shown (B suffix) have a +/-5% tolerance on nominal Zener voltage. The suffix A is used to identify +/10% tolerance; suffix C is used to identify +/-2%; and suffix D is used to identify +/-1% tolerance; no suffix indicates +/-20% tolerance. NOTE 2: Zener voltage (VZ) is measured after the test current has been applied for 20 5 seconds. The device shall be suspended by its leads with the inside edge of the mounting clips between.375" and.500" from the body. Mounting clips shall be maintained a o temperature -2 C. NOTE 3: The zener impedance is derived when a 60 cycle ac current having an rms value equal 10% of the dc zener current (IZT or IZK) is superimposed on IZT or IZK. Zener impedance is measured at 2 points to ensure a sharp knee on the breakdown curve and to eliminate unstable units. See MicroNote 202 for variation in dynamic impedance with different zener currents. NOTE 4: The values of IZM are calculated for a 5% tolerance on nominal zener voltage. Allowance has been made for the rise in zener voltage above VZT which results from zener impedance and the increase in junction temperature as power dissipation approaches o 400 mW. In the case of individual diodes IZM is that value of current which results in a dissipation 75 C lead temperature at 3/8" from body. NOTE 5: The surge for IZSM is a square wave or equivalent half-sine wave pulse of 1/120 sec. duration.