2SC3784 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 50 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1.2 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 1000
• Transition Frequency, min: 180 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.Sometimes the "2S" prefix is not marked on the package - the 2SC3784 might only be marked "C3784".You can replace the 2SC3784 with the 2SC3785, 2SC3786, 2SD1509, 2SD1692, 2SD1692-K, 2SD1692-L, 2SD1692-M, 2SD985, 2SD985-K, 2SD985-L, 2SD985-M, 2SD986, 2SD986-K, 2SD986-L, 2SD986-M, KSB985, KSB985-O, KSB985-R, KSB985-Y, KSB986, KSB986-O, KSB986-R, KSB986-Y, KSD1692, KSD1692-G, KSD1692-O, KSD1692-Y, MJE270 or MJE270G.