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KTC4378

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Changjiang Electronics Tech (CJ) Bipolar Transistors - BJT, SOT-89-3L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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KTC4378

Changjiang Electronics Tech (CJ) · Bipolar Transistors - BJT · SOT-89-3L

KTC4378 from Changjiang Electronics Tech (CJ), in a SOT-89-3L. 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; the base-emitter saturation voltage VBE(sat) is 1.2 V at IC=500mA, IB=50mA.
2 COLLECTOR passive Collector terminal; the datasheet rates VCBO at 80 V, VCEO at 60 V and continuous collector current IC at 1 A.
3 EMITTER passive Emitter terminal; the datasheet rates VEBO at 5 V and the emitter-base breakdown voltage V(BR)EBO at 5 V at IE=1mA.

Key specifications

Parameter Value
Manufacturer Changjiang Electronics Tech (CJ)
Package SOT-89-3L
Category Transistors
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-Emitter Voltage VCEO 60 V Ta=25℃ 1
Collector-Base Voltage VCBO 80 V Ta=25℃ 1
Emitter-Base Voltage VEBO 5 V Ta=25℃ 1
Collector Current -Continuous IC 1 A Ta=25℃ 1
Collector Dissipation PC 0.5 W Ta=25℃ 1
Junction Temperature TJ 150 ℃ 1
Storage Temperature Tstg -55 150 ℃ 1
Collector-base breakdown voltage V(BR)CBO 80 V IC=1mA,IE=0 1
Collector-emitter breakdown voltage V(BR)CEO 60 V IC=10mA,IB=0 1
Emitter-base breakdown voltage V(BR)EBO 5 V IE=1mA,IC=0 1
Collector cut-off current ICBO 0.1 μA VCB=50V,IE=0 1
Emitter cut-off current IEBO 0.1 μA VEB=4V,IC=0 1
DC current gain hFE(1) 100 320 VCE=2V,IC=0.05A 1
DC current gain hFE(2) 30 VCE=2V,IC=1A 1
Collector-emitter saturation voltage VCE(sat) 0.5 V IC=500mA,IB=50mA 1
Base-emitter saturation voltage VBE(sat) 1.2 V IC=500mA,IB=50mA 1
Transition frequency fT 150 MHz VCE=10V,IC=50mA 1
Collector output capacitance Cob 12 pF VCB=10V,IE=0,f=1MHz 1

CAD (KiCad official)

  • Symbol: KTC4378
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3L (KiCad packages3D, STEP)
  • 3D model files: ktc4378-etched.step / ktc4378-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ktc4378.step / ktc4378.glb are the bare package body.

Provenance

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

  • Datasheet: Changjiang Electronics Tech (CJ) datasheet (1 pp, sha256 2cfeebc5a9532a6b, retrieved 2026-10-27, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus off (skipped (clean text read)), 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