1N972A manual: "0.5W, silicon zener diode. Zener voltage 30V. Test current 4.2mA. +-10% tolerance."

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1N972A Datasheet and 1N972A 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 30V. Test current 4.2mA. +-10% tolerance."