2SA2121-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -200 V
• Collector-Base Voltage, max: -200 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -15 A
• Collector Dissipation: 220 W
• DC Current Gain (h_fe): 80 to 160
• Transition Frequency, min: 25 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.The 2SA2121-O transistor can have a current gain of 80 to 160. The gain of the 2SA2121 will be in the range from 55 to 160, for the 2SA2121-R it will be in the range from 55 to 110.Sometimes the "2S" prefix is not marked on the package - the 2SA2121-O might only be marked "A2121-O".The complementary NPN transistor to the 2SA2121-O is the 2SC5949-O.You can replace the 2SA2121-O with the 2SA1302, 2SA1302O, 2SA1943, 2SA1943N, 2SA1943O, 2SA1962, 2SA1962O, 2SA1986, 2SA1986-O, 2SA2151, 2SA2151A, 2SA2151A-O, 2SA2151A-P, 2SA2151A-Y, FJA4213, FJA4213O, FJL4215, FJL4215O, KTA1943, KTA1943A, KTA1943AO, KTA1943O, KTA1962, KTA1962A, KTA1962AO, KTA1962O, MJL4302A, MJL4302AG, MJW1302A, MJW1302AG, NTE2329 or TTA1943.