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BC558A

Public Made by Adom

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

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BC558A

DIOTEC · Bipolar (BJT) · TO-92

BC558A from DIOTEC, 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 C passive Collector of the PNP transistor; max -VCEO 30 V, -VCBO 30 V and DC collector current -IC 100 mA (200 mA peak) for BC558.
2 B passive Base of the PNP transistor; peak base current -IBM 200 mA.
3 E passive Emitter of the PNP transistor; max -VEBO 5 V and peak emitter current IEM 200 mA.

Key specifications

Parameter Value
Manufacturer DIOTEC
Package TO-92
Category Transistors/Thyristors
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 (BC558/559 column) VCES 30 V E-B short; TA = 25°C 1
Collector-Base voltage (BC558/559 column) VCBO 30 V E open; TA = 25°C 1
Emitter-Base voltage VEBO 5 V C open; TA = 25°C 1
Power dissipation Ptot 500 mW TA = 25°C; leads kept at TA at 2 mm from case 1
Collector current DC IC 100 mA DC; TA = 25°C 1
Peak collector current ICM 200 mA TA = 25°C 1
Peak base current IBM 200 mA TA = 25°C 1
Peak emitter current IEM 200 mA TA = 25°C 1
Junction temperature Tj -55 150 °C 1
Storage temperature TS -55 150 °C 1
DC current gain, Group A hFE 110 220 - VCE = - 5 V, IC = - 2 mA, Group A 2
Collector-Emitter cutoff current (BC558/559) ICES 0.2 15 nA - VCE = 30 V, B-E short 2
Collector-Emitter cutoff current (BC558/559), Tj = 125°C ICES 4 µA - VCE = 30 V, B-E short, Tj = 125°C 2
Collector-Emitter saturation voltage VCEsat 80 250 mV - IC = 10 mA, - IB = 0.5 mA 2
Collector-Emitter saturation voltage VCEsat 300 650 mV - IC = 100 mA, - IB = 5 mA 2
Base-Emitter voltage VBE 600 660 mV - VCE = 5 V, - IC = 2 mA 2
Base-Emitter voltage VBE 750 820 mV - VCE = 5 V, - IC = 10 mA 2
Collector-Base capacitance CCBO 3.5 6 pF - VCB = 10 V, IE = ie = 0, f = 1 MHz 2
Noise figure (BC556...BC558) F 2 10 dB - VCE = 5 V, - IC = 200 µA, RG = 2 kΩ, f = 1 kHz, Δf = 200 Hz 2
Typical thermal resistance junction to ambient RthA 200 K/W leads kept at ambient temperature at 2 mm distance from case 2

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts silver affect human life or health, user shall contact in advance Diotec Semiconductor AG's Managing Board (Heitersheim, Germany) to 4

CAD (KiCad official)

  • Symbol: BC558A
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: bc558a-etched.step / bc558a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc558a.step / bc558a.glb are the bare package body.

Provenance

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

  • Datasheet: DIOTEC datasheet (4 pp, sha256 f2051b60b559de98, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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