This post explains for MOSFET.
The Part Number is K2961, 2SK2961.
The function of this semiconductor is 60V, 2A, N-Channel MOSFET.
The Package: TO-92MOD Type
Manufacturer: Toshiba Semiconductor
Preview images :
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Description
The K2961 is 60V, 2A, Silicon N Channel MOS Type Field Effect Transistor.
Features
1. Low drain−source ON resistance : RDS (ON) = 0.2 Ω (typ.)
2. High forward transfer admittance : |Yfs| = 2.0 S (typ.)
3. Low leakage current : IDSS = 100 μA (VDS = 60 V)
4. Enhancement mode : Vth = 0.8~2.0 V (VDS = 10 V, ID = 1 mA) […]
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Absolute Maximum Ratings (Ta = 25°C)
1. Drain to source voltage: VDSS = 60 V
2. Gate to source voltage: VGSS = ± 20 V
3. Drain current: ID = 2 A
4. Drain Power Dissipation: Pd = 0.9 W
5. Channel temperature: Tch = 150 °C
6. Storage temperature: Tstg = -55 to +150 °C
Application:
1. Relay Drive
2. Motor Drive and DC-DC Converter