This document describes the Silicon 500 mW Zener Diodes produced by Microsemi Scottsdale Division. These diodes offer a voltage selection from 6.8 to 200 volts with different tolerances and an optional internal metallurgical bond.
The Microsemi 1N957B‑1 to 1N992B‑1 series provides 0.5 W Zener voltage regulators in a DO‑35 axial‑lead glass package. Voltage options range from 6.8 V to 200 V with selectable tolerances (±5 %, ±10 %, ±2 % or ±1 %).
The datasheet lists detailed electrical characteristics, thermal ratings, mechanical dimensions, and packaging options, including metal‑bonded versions (‑1 suffix) and MIL‑qualified variants. It also includes temperature‑coefficient curves and capacitance versus voltage graphs.
| Zener voltage range | 6.8 V to 200 V |
|---|---|
| Power rating | 0.5 W |
| Operating temperature | -65 °C to +175 °C |
| Package type | DO‑35 (DO‑204AH) axial‑lead glass |
| Forward voltage @200 mA | 1.1 V (max) for 1N957B‑1‑1N985B‑1, 1.3 V for 1N985‑1‑1N992B‑1 |
They operate from –65 °C to +175 °C.
They are supplied in a hermetically sealed axial‑lead glass DO‑35 (DO‑204AH) package.