KST3904 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 40 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 0.2 A
• Collector Dissipation: 0.35 W
• DC Current Gain (h_fe): 100 to 300
• Transition Frequency, min: 300 MHz
• Noise Figure, max: 5 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-23
• Electrically Similar to the Popular 2N3904 transistor

Here is an image showing the pin diagram of this transistor.The KST3904 transistor is marked as "1A".The complementary PNP transistor to the KST3904 is the KST3906.The 2N3904 is the TO-92 version of the KST3904.You can replace the KST3904 with the 2SC3441, 2SC3912, 2SC3913, 2SC3914, 2SC3915, 2SD602A, BC817, BCW66, BCX19, FMMT2222A, FMMT2222AR, FMMT3904, FMMT491, FMMT491Q, FMMT619, FMMTA05, FMMTA06, KN2222AS, KN3904S, KST05, KST06, KST2222A, KST4401, KTN2222AS, MMBT100, MMBT2222A, MMBT3904, MMBT3904L, MMBT3904LT1, MMBT3904LT1G, MMBT3904LT3, MMBT3904LT3G, MMBT4401, MMBTA05, MMBTA06, PMBT2222A, PMBT3904, PMBT4401, PMBTA06, PMST2222A, SMBTA05 or SMBTA06.