It's a 1N4742A 12v 1w Zener diode. This is a 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 | 12V |
| Zener Number | 1N4742A |
| Power Dissipation | 1W |
| Zener Tolerance | 5% |
| Package | DO-41 |
| Number of pieces | 25 |
| Country of Origin | China |
