KSC2258A Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 300 V
• Collector-Base Voltage, max: 300 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 4 W
• DC Current Gain (h_fe): 40
• Transition Frequency, min: 100 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 2SC4497-O (SOT-23), BF620 (SOT-89), BF820 (SOT-23) and PMBTA42 (SOT-23) is the SMD version of the KSC2258A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the KSC2258A with the 2SC2688, 2SC2688-K, 2SC2688-L, 2SC2688-M, 2SC2688-N, 2SC2752K, 2SC3417, 2SC3417-C, 2SC3417-D, 2SC3417-E, 2SC3417-F, 2SC3503, 2SC3503-C, 2SC3503-D, 2SC3503-E, 2SC3503-F, 2SC3789, 2SC3789-C, 2SC3789-D, 2SC3789-E, 2SC3789-F, 2SC3790, 2SC3790-C, 2SC3790-D, 2SC3790-E, 2SC3790-F, 2SC4212, BUX86, BUX87, KSC2688, KSC2688-G, KSC2688-O, KSC2688-R, KSC2688-Y, KSC2752Y, KSC3503, KSC3503-C, KSC3503-D, KSC3503-E or KSC3503-F.