The 2N3421 is an NPN bipolar junction transistor from Microchip Technology. It features a collector-emitter breakdown voltage of 80V, collector current of 3A, and power dissipation of 1W in a TO-5 package.
2N3725 is an NPN bipolar junction transistor from Texas Instruments. It features a maximum collector-emitter voltage of 50V and collector current of 1A, with a TO-5 through-hole package.
