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BC556

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Changjiang Electronics Tech (CJ) Bipolar Transistors - BJT, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componenttransistorsbc556factory-2.0.0extractor-text

Verified BC556

by Ray · last 31 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

31 Oct 2026RayPublished by the parts factory: tier lcsc, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: BC556 · TO-92 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 2-page datasheet
  • •distributor (warn): no ['digikey'] number
  • ✓family: TO-92_Inline
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-pfy4zsm9/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ bc556.kicad_sym✓ bc556.kicad_mod✓ bc556.step
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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BC556

Changjiang Electronics Tech (CJ) · Bipolar Transistors - BJT · TO-92

BC556 from Changjiang Electronics Tech (CJ), in a TO-92. 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 COLLECTOR passive Collector; VCBO -80V (BC556), VCEO -65V (BC556), continuous collector current -0.1 A.
2 BASE input Base; emitter-base voltage limit VEBO is -5 V.
3 EMITTER passive Emitter of the PNP transistor; V(BR)EBO is -5 V at IE=-100 µA.

Key specifications

Parameter Value
Manufacturer Changjiang Electronics Tech (CJ)
Package TO-92
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-Base Voltage VCBO -80 V BC556, Ta=25℃ 1
Collector-Emitter Voltage VCEO -65 V BC556, Ta=25℃ 1
Emitter-Base Voltage VEBO -5 V Ta=25℃ 1
Collector Current-Continuous IC -0.1 A Ta=25℃ 1
Collector Power Dissipation PC 625 mW Ta=25℃ 1
Thermal Resistance from Junction to Ambient RθJA 200 ℃/W 1
Junction Temperature Tj 150 ℃ 1
Storage Temperature Tstg -55 150 ℃ 1
Collector-base breakdown voltage V(BR)CBO -80 V IC= -0.1mA,IE=0, BC556 2
Collector-emitter breakdown voltage V(BR)CEO -65 V IC=-2mA,IB=0, BC556 2
Emitter-base breakdown voltage V(BR)EBO -5 V IE=-100μA,IC=0 2
Collector cut-off current ICBO -0.1 μA VCB=-70V,IE=0, BC556 2
Emitter cut-off current IEBO -0.1 μA VEB=-5V,IC=0 2
DC current gain hFE 120 800 VCE=-5V, IC=-2mA 2
Collector-emitter saturation voltage VCE(sat) -0.3 V IC=-10mA,IB=-0.5mA 2
Collector-emitter saturation voltage VCE(sat) -0.65 V IC=-100mA,IB=-5mA 2
Base-emitter saturation voltage VBE(sat) -0.8 V IC=-10mA,IB=-0.5mA 2
Base-emitter saturation voltage VBE(sat) -1 V IC=-100mA,IB=-5mA 2
Base-emitter voltage VBE -0.55 -0.7 V VCE=-5V, IC=-2mA 2
Base-emitter voltage VBE -0.82 V VCE=-5V, IC=-10mA 2
Collector output capacitance Cob 6 pF VCB=-10V,IE=0, f=1MHz 2
Transition frequency fT 150 MHz VCE=-5V,IC=-10mA, f=100MHz, BC556 2

CAD (KiCad official)

  • Symbol: BC556
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: bc556-etched.step / bc556-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc556.step / bc556.glb are the bare package body.

Provenance

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

  • Datasheet: Changjiang Electronics Tech (CJ) datasheet (2 pp, sha256 ce8dcdd4f2145ae3, retrieved 2026-10-31, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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