KSD261Y Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 20 V
• Collector-Base Voltage, max: 40 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.5 A
• Collector Dissipation: 0.5 W
• DC Current Gain (h_fe): 120 to 240
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2SD261Y transistor

The KSD261Y 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 KSD261CY transistor (with suffix "C") is the center collector version of the KSD261Y.
Here is an image showing the pin diagram of this transistor.The KSD261Y transistor can have a current gain of 120 to 240. The gain of the KSD261 will be in the range from 120 to 400, for the KSD261G it will be in the range from 200 to 400.The complementary PNP transistor to the KSD261Y is the KSA643Y.The 2SD261Y is the TO-92 version of the KSD261Y.You can replace the KSD261Y with the 2N4401, 2N5172, 2SC1209, 2SD261, 2SD261Y, 2SD471A, 2SD471AY, KN2222, KN2222A, KSD471A, KSD471AY, KSP2222A, KTC8050, KTC9013, KTN2222, KTN2222A, M8050, MPS2222, MPS2222A, MPS2222AG, MPS2222G, MPS3704, MPS3706, MPS650, MPS650G, MPS6531, MPS6532, MPS6601, MPS6601G, MPS6602, MPS6602G, MPS8050, MPSW01, MPSW01A, MPSW01AG, MPSW01G, NTE123AP, P2N2222A, P2N2222AG, PN2219, PN2219A, PN2222, PN2222A, PN3569, S8050, S9013, SS8050 or ZTX449.