Zener diode (1N4733A)
1N4733A · 5.1 V Zener · 1 W · 7 Ω at 49 mA
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: 1N47xx 1 W series
Pins
- Anode
- Cathode (band)
Ratings and limits
| Zener voltage | 5.1 V ±5 % |
|---|---|
| Power | 1 W at 50 °C lead temperature |
| Max zener current | ≈ 196 mA |
How to use it
Simple voltage reference or clamp: a resistor from the supply feeds the zener; the load takes its voltage across the zener.
Lessons and builds that use it
- Zener shunt regulator
- Series-pass regulator (transistor + Zener)
- SCR crowbar over-voltage protection
- Reverse-polarity protection with a P-MOSFET
- 65 W USB-C PD stage on a ready-made 24 V supply: buck converter, PD controller, load switch (build)
- 65 W USB-C PD charger from scratch: mains flyback (UC3844, 800 V MOSFET, PQ2625 transformer), TL431 + PC817 feedback, PD controller (build)
- Real device: phone charger, 220 V AC wall to 5 V USB (build)
- Real device: laptop charger, 220 V AC wall to 20 V with PFC (build)