2SA1537-D Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -70 V
• Collector-Base Voltage, max: -80 V
• Emitter-Base Voltage, max: -3 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 700 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126F

Here is an image showing the pin diagram of this transistor.The 2SA1537-D transistor can have a current gain of 60 to 120. The gain of the 2SA1537 will be in the range from 40 to 320, for the 2SA1537-C it will be in the range from 40 to 80, for the 2SA1537-E it will be in the range from 100 to 200, for the 2SA1537-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1537-D might only be marked "A1537-D".The complementary NPN transistor to the 2SA1537-D is the 2SC3952-D.The FMMTA56 (SOT-23) and KST56 (SOT-23) is the SMD version of the 2SA1537-D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1537-D with the 2N4920, 2N4920G, 2SA1220, 2SA1220-R, 2SA743A, 2SA743A-B, 2SB548, 2SB548-R, 2SB549, 2SB549-R, 2SB631, 2SB631-D, 2SB631K, 2SB631K-D, 2SB649, 2SB649-B, BD140, BD140G, BD170, BD180, BD180G, BD231, BD238, BD238G, BD380, BD442, BD442G, BD790, BD792, KSA1220, KSA1220-R, KSE172, MJE172, MJE172G, MJE250, MJE251, MJE252, MJE253, MJE253G, MJE254 or MJE712.