BCW31 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 32 V
• Collector-Base Voltage, max: 32 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.5 A
• Collector Dissipation: 0.35 W
• DC Current Gain (h_fe): 110 to 220
• Transition Frequency, min: 200 MHz
• Noise Figure, max: 4 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-23

Here is an image showing the pin diagram of this transistor.The BCW31 transistor is marked as "D1".The complementary PNP transistor to the BCW31 is the BCW29.You can replace the BCW31 with the 2SC3325, 2SC3912, 2SC3913, 2SC3914, 2SC3915, 2SD602A, BC817, BC817-16, BCV71, BCW65, BCW65A, BCW66, BCW66F, BCX19, FMMT2222A, FMMT2222AR, FMMT491, FMMT491Q, FMMT619, FMMTA05, KN2222AS, KST05, KST2222A, KST4401, KTN2222AS, MMBT100, MMBT2222A, MMBT4401, MMBTA05, PMBT2222A, PMBT4401, PMST2222A or SMBTA05.