PN3638A Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -25 V
• Collector-Base Voltage, max: -25 V
• Emitter-Base Voltage, max: -4 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 0.625 W
• DC Current Gain (h_fe): 100
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The PN3638A 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, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The BC808 (SOT-23), BC808-16 (SOT-23), BC808-16W (SOT-323), BC808-25 (SOT-23), BC808-25W (SOT-323), BC808-40 (SOT-23), BC808-40W (SOT-323), BC808W (SOT-323), MMBTA63 (SOT-23), MMBTA64 (SOT-23), MMBTA65 (SOT-23), PMBTA64 (SOT-23), PZTA63 (SOT-223), PZTA64 (SOT-223) and PZTA65 (SOT-223) is the SMD version of the PN3638A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the PN3638A with the 2N4952, 2N4953, 2SA1020Y, 2SA1150, 2SA1150-O, 2SA1150-Y, 2SA1270-Y, 2SA1271, 2SA1271-O, 2SA1271-Y, 2SA1273, 2SA1273-O, 2SA1273-Y, 2SA1287, 2SA1287-G, 2SA1382, 2SA1534-R, 2SA1534-S, 2SA1534A-R, 2SA1534A-S, 2SA1619-R, 2SA1619-S, 2SA1619A-R, 2SA1619A-S, 2SA1680, 2SA1761, 2SA200-Y, 2SA562TM-Y, 2SA683-R, 2SA683-S, 2SA684-R, 2SA684-S, 2SA719-R, 2SA719-S, 2SA720-R, 2SA720-S, 2SA928A, 2SA928A-O, 2SA928A-Y, 2SA950, 2SA950-O, 2SA950-Y, 2SA952-K, 2SA952-L, 2SA966, 2SA966-O, 2SA966-Y, 2SA984-E, 2SA984-F, 2SA993C, 2SA993D, 2SB1116, 2SB1116-K, 2SB1116-L, 2SB1116-U, 2SB1229, 2SB1229-R, 2SB1229-S, 2SB1229-T, 2SB1229-U, 2SB564K, 2SB564L, 2SB598-E, 2SB598-F, 2SB598-G, 2SB621-R, 2SB621-S, 2SB621A-R, 2SB621A-S, 2SB740, 2SB740-B, 2SB740-C, 2SB764-E, 2SB764-F, 2SB892, 2SB892-R, 2SB892-S, 2SB892-T, 2SB892-U, 2SB985, 2SB985R, 2SB985S, 2SB985T, 2SB985U, BC876, KSA1281-Y, KSA928A, KSA928A-O, KSA928A-Y, KSB1116, KSB1116-G, KSB1116-L, KSB1116-Y, KSB1116S, KSB1116S-G, KSB1116S-L, KSB1116S-Y, KSB564ACG, KSB564ACY, KSB810-G, KSB810-Y, KSB811-G, KSB811-Y, KTA1270Y, KTA1271, KTA1271O, KTA1271Y, KTA1272, KTA1272O, KTA1272Y, KTA1273, KTA1273O, KTA1273Y, KTA1281Y, KTA1282, KTA1282O, KTA1282Y, KTA1283GR, KTA1283Y, KTA200-Y, KTB764-GR, KTB764-Y, MPS3638A, NTE193A, STB1277, STB1277-O or STB1277-Y.