2SD2114KT146W

2SD2114KT146W is a transistor from the Japanese 2SD NPN family. It’s a discrete silicon transistor used for amplification or switching in RF/analog circuits and general purpose “small-signal” roles.
What the suffix means:
- KT146W: a package/lot/version code; not a feature spec. The exact electrical data (Vce, Ic, ft, hFE, Pd) depends on the specific device revision and lot.
Key points:
- Type: NPN silicon transistor.
- Typical uses: RF/audio/driver stages, switching in discrete circuits.
- Packaging and pinout: varies by vendor; consult the exact datasheet for your part.
- Essential data: check Vce, Ic, power dissipation, frequency response (ft), gain, and thermal requirements in the datasheet.
If you’re sourcing or replacing it, obtain the official datasheet for the exact lot and verify pinout and ratings. I can help look up the datasheet and summarize the precise numbers if you want.

Pin count: 3.
Function: It is an NPN bipolar transistor (three-terminal device: Base, Collector, Emitter) used for switching and general-purpose amplification. Exact pin numbering (which lead is B/C/E) depends on the package variant—refer to the component's datasheet for the package-specific pin map.

2SD2114KT146W is a high‑voltage NPN power transistor. Common application areas include:
- Switching power supplies and DC‑DC converters
- Motor-drive circuits (DC motors, stepper motors)
- Linear regulators and pass elements in power supplies
- Inverters, uninterruptible power supplies, and renewable‑energy interfaces
- Medium‑power audio output stages
- Industrial/telecom equipment requiring rugged, high‑voltage switching
Note: check the datasheet for exact ratings (Vce, Ic, gain, switching speed) and heat-sinking requirements, and respect the safe operating area.

TO-220 plastic package (through-hole power transistor).