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2SC4944

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Changjing Bipolar (BJT), SOT-353. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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2SC4944

Changjing · Bipolar (BJT) · SOT-353

2SC4944 from Changjing, in a SOT-353. 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 B1 input Base of the first NPN transistor (the one whose collector is pin 5); VEBO max 5 V.
2 E passive Common emitter of both NPN transistors; collector current is 150 mA max per the ratings.
3 B2 input Base of the second NPN transistor (the one whose collector is pin 4); VEBO max 5 V.
4 C2 passive Collector of the second NPN transistor; VCBO 60 V, VCEO 50 V, IC 150 mA continuous.
5 C1 passive Collector of the first NPN transistor; VCBO 60 V, VCEO 50 V, IC 150 mA continuous.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-353
Category Transistors/Thyristors
Pins 5

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-Base Voltage VCBO 60 V 1
Collector-Emitter Voltage VCEO 50 V 1
Emitter-Base Voltage VEBO 5 V 1
Collector Current -Continuous IC 150 mA 1
Collector Power Dissipation PC 200 mW 1
Operation Junction and Storage Temperature Range TJ,Tstg -55 150 ℃ 1
Collector-base breakdown voltage V(BR)CBO 60 V IC=100μA,IE=0 1
Collector-emitter breakdown voltage V(BR)CEO 50 V IC=1mA,IB=0 1
Emitter-base breakdown voltage V(BR)EBO 5 V IE=100μA,IC=0 1
Collector cut-off current ICBO 0.1 μA VCB=60V,IE=0 1
Emitter cut-off current IEBO 0.1 μA VEB=5V,IC=0 1
DC current gain hFE 120 400 VCE=6V,IC=2mA 1
Collector-emitter saturation voltage VCE(sat) 0.25 V IC=100mA,IB=10mA 1

CAD (KiCad official)

  • Symbol: 2SC4944
  • Footprint: Package_TO_SOT_SMD:SOT-353_SC-70-5
  • 3D model: SOT-353 (KiCad packages3D, STEP)
  • 3D model files: 2sc4944-etched.step / 2sc4944-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 2sc4944.step / 2sc4944.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (3 pp, sha256 94c555b7567e292d, retrieved 2026-10-21, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF