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KTC4379-Y-RTF

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KEC Semicon Bipolar Transistors - BJT, SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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KTC4379-Y-RTF

KEC Semicon · Bipolar Transistors - BJT · SOT-89

KTC4379-Y-RTF from KEC Semicon, in a SOT-89. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 BASE input Base terminal of the NPN transistor, labelled BASE in the SOT-89 pin figure.
2 COLLECTOR (HEAT SINK) passive Collector terminal, which is also the heat sink tab of the SOT-89 package, as labelled in the pin figure.
3 EMITTER passive Emitter terminal of the NPN transistor, labelled EMITTER in the SOT-89 pin figure.

Key specifications

Parameter Value
Manufacturer KEC Semicon
Package SOT-89
Category Triode/MOS Tube/Transistor
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Collector Cut-off Current ICBO 0.1 A VCB=50V, IE=0 1
Emitter Cut-off Current IEBO 0.1 A VEB=5V, IC=0 1
Collector-Emitter Breakdown Voltage V(BR)CEO 50 V IC=10mA, IB=0 1
DC Current Gain hFE(1), rank Y hFE (1) 120 240 VCE=2V, IC=0.5A (Note 1); rank Y per Note 2 (Y:120-240) 1
DC Current Gain hFE (2) 40 VCE=2V, IC=1.5A (Note 1) 1
Collector-Emitter Saturation Voltage VCE(sat) 0.5 V IC=1A, IB=0.05A (Note 1) 1
Base-Emitter Saturation Voltage VBE(sat) 1.2 V IC=1A, IB=0.05A (Note 1) 1
Collector-Base Voltage VCBO 50 V Ta=25 1
Collector-Emitter Voltage VCEO 50 V Ta=25 1
Emitter-Base Voltage VEBO 5 V Ta=25 1
Collector Current IC 2 A Ta=25 1
Base Current IB 0.4 A Ta=25 1
Collector Power Dissipation PC 500 mW Ta=25 1
Collector Power Dissipation (mounted on ceramic substrate) PC* 1 W mounted on ceramic substrate (250mm2 x0.8t) 1
Junction Temperature Tj 150 1
Storage Temperature Range Tstg -55 150 1

CAD (KiCad official)

  • Symbol: KTC4379-Y-RTF
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: ktc4379-y-rtf-etched.step / ktc4379-y-rtf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ktc4379-y-rtf.step / ktc4379-y-rtf.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: KEC Semicon datasheet (4 pp, sha256 f54b49df81db07d0, retrieved 2026-11-05, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF