The document describes the features and characteristics of the 1N821 to 1N829A-1 series temperature-compensated Zener reference diodes manufactured by Microsemi. These reference diodes provide a selection of both 6.2V and 6.55V nominal voltages and temperature coefficients as low as 0.0005%/oC for minimal voltage change with temperature when operated at 7.5mA. These reference diodes are suitable for military and other applications and offer various military and radiation-hardened options.
The 1N821 through 1N829A-1 series are temperature‑compensated Zener reference diodes offered in DO‑7 glass axial‑lead packages. They are available with nominal voltages of 6.2 V and 6.55 V and feature very low temperature coefficients, down to 0.0005 %/°C, making them suitable for precision instrumentation.
The datasheet lists mechanical details (hermetically sealed glass case, 0.2 g weight), electrical ratings (500 mW power dissipation at 25 °C, up to 70 mA current), and operating temperature range from –65 °C to +175 °C. Package options include standard DO‑7, smaller DO‑35, and surface‑mount equivalents, with tape‑and‑reel handling per EIA‑296.
| Nominal Voltage | 6.2 V and 6.55 V |
|---|---|
| Temperature Coefficient | as low as 0.0005 %/°C |
| Maximum Power Dissipation | 500 mW @ 25 °C |
| Maximum Current | 70 mA |
| Operating Temperature Range | -65 °C to +175 °C |
| Package Type | Hermetically sealed glass case DO‑7 |
| Weight | 0.2 g |
The series is available with nominal voltages of 6.2 V and 6.55 V.
They have temperature coefficients as low as 0.0005 %/°C.
The diodes can dissipate up to 500 mW at 25 °C.
They are rated for operation from –65 °C to +175 °C.