It's a 1N4730A 1w 3.9v Zener diode. This is general purpose diode which use in Voltage reference, Voltage stabilizer, Shunt regulator, Clipping and clamping circuits, Voltage switching operation, Different kinds of protection circuit
Specification
| Zener Voltage | 3.9V |
| Zener Number | 1N4730A |
| Power Dissipation | 1W |
| Zener Tolerance | 5% |
| Package | DO-41 |
| Number of pieces | 25 |
| Country of Origin | China |
