This is a 1N4001 Diode a member of the 1N400X series, a series of general-purpose silicon rectifier diodes with a current rating of 1A. They are mostly used for voltage regulation
Technical Specification
Type: Switching Diode
Peak Reverse Repetitive Voltage: 50V
Maximum continuous forward current: 1A
Peak Non-repetitive Surge Current: 30A
Peak forward Voltage: 1.1V
Peak Reverse Current: 5µA
Operating Temperature: -50˚C ~ +175˚C
Part Status: Active
Application
Diodes are used in power circuits for voltage rectification, clipping and clamping circuits.