2N3643 general-purpose NPN silicon bipolar junction transistor

The 2N3643 is a general-purpose NPN silicon bipolar junction transistor designed for amplification and switching applications. It supports up to 500mA continuous collector current with a maximum collector-emitter voltage of 30V. Typically housed in a TO-92 plastic package, earlier versions may come in a TO-105 metal can. Though no longer in active production and considered obsolete, the 2N3643 remains valuable for legacy electronic repairs and specialized projects requiring its specific characteristics.