1N748D manual: 500mW, silicon zener diode. Zener voltage 3.9 V. Test current 20 mA. +-1% tolerance.

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1N748D Datasheet and 1N748D manual

Manufacturer : JGD

Packing : DO-35

Pins : 2

Temperature : Min -55 °C | Max 175 °C

Size : 218 KB

Application : 500mW, silicon zener diode. Zener voltage 3.9 V. Test current 20 mA. +-1% tolerance.