It's a 1N5819 1A 40v Schottky diode. This is a general purpose Schottky diode, which have low switching noise, low forward voltage drop, high current capability, high switching capability, high surge capability. This type diode generally use switch mode power supply, DC DC converter controller circuit, power factor controller circuit, and battery charging circuit.
Specification-
| Diode Type | Schottky |
| VOLTAGE RANGE | 20 TO 40 Volts |
| CURRENT | 1 Amp |
| Country of Origin | China |
