1N978C manual: 0.5W, silicon zener diode. Zener voltage 51V. Test current 2.5mA. +-2% tolerance.

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1N978C Datasheet and 1N978C manual

Manufacturer : JGD

Packing : DO-35

Pins : 2

Temperature : Min -55 °C | Max 175 °C

Size : 203 KB

Application : 0.5W, silicon zener diode. Zener voltage 51V. Test current 2.5mA. +-2% tolerance.