2N5129 is an NPN silicon transistor (NOS GOLD PIN)

The 2N5129 is an NPN silicon transistor designed for small-signal amplification and switching applications. It features a maximum collector-emitter voltage of 12 V, a collector current rating up to 500 mA, and a power dissipation limit of 300 mW. With a transition frequency of 200 MHz, it is suitable for moderate-frequency circuits. Packaged in a TO-106 epoxy case, this transistor is now considered obsolete but remains valuable for restoring or maintaining legacy electronic equipment.