KSC3503 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 300 V
• Collector-Base Voltage, max: 300 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 7 W
• DC Current Gain (h_fe): 40 to 320
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The KSC3503 transistor can have a current gain of 40 to 320. The gain of the KSC3503-C will be in the range from 40 to 80, for the KSC3503-D it will be in the range from 60 to 120, for the KSC3503-E it will be in the range from 100 to 200, for the KSC3503-F it will be in the range from 160 to 320.The complementary PNP transistor to the KSC3503 is the KSA1381.The PMBTA42 (SOT-23) is the SMD version of the KSC3503 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the KSC3503 with the 2SC2899, 2SC3417, 2SC3503, 2SC3789, 2SC3790, BD128, BD129 or KSC2258A.