2SA641-E Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.03 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 350 to 700
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +125 °C
• Package: TO-92

The 2SA641-E is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads.
Here is an image showing the pin diagram of this transistor.The 2SA641-E transistor can have a current gain of 350 to 700. The gain of the 2SA641 will be in the range from 150 to 1000, for the 2SA641-F it will be in the range from 225 to 450, for the 2SA641-H it will be in the range from 150 to 300, for the 2SA641-U it will be in the range from 500 to 1000.Sometimes the "2S" prefix is not marked on the package - the 2SA641-E might only be marked "A641-E".The complementary NPN transistor to the 2SA641-E is the 2SC923-E.You can replace the 2SA641-E with the 2N5087, BC317, BC320, HS733, HS733-BL, KSA733, KSA733L, KSP55, KSP56, KTC9015, MPS751, MPS751G, MPSA55, MPSA55G, MPSA56, MPSA56G, MPSW55, MPSW55G, MPSW56, MPSW56G, PN4250A, S9015, SS9015 or ZTX792A.