KSD471AY Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 30 V
• Collector-Base Voltage, max: 40 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 120 to 240
• Transition Frequency, min: 130 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2SD471AY transistor

The KSD471AY is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads. The KSD471ACY transistor (with suffix "C") is the center collector version of the KSD471AY.
Here is an image showing the pin diagram of this transistor.The KSD471AY transistor can have a current gain of 120 to 240. The gain of the KSD471A will be in the range from 120 to 400, for the KSD471AG it will be in the range from 200 to 400.The complementary PNP transistor to the KSD471AY is the KSB564AY.The FMMT449 (SOT-23) is the SMD version of the KSD471AY transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.The 2SD471AY is the TO-92 version of the KSD471AY.You can replace the KSD471AY with the 2SD471A, 2SD471AY, BC537, BC537-16, MPS650, MPS650G, MPS651, MPS651G, MPS6602, MPS6602G, MPSW01, MPSW01A, MPSW01AG, MPSW01G, PN2222A, ZTX449 or ZTX450.