component
BC557C
Public Made by Adomby adom
LGE Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownBC557C
LGE · Bipolar (BJT) · TO-92
BC557C from LGE, 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 | EMITTER | passive | Emitter terminal of the PNP transistor; emitter-base breakdown is specified at VEBO = -5 V (IE = -100 µA, IC = 0). |
| 2 | BASE | passive | Base terminal of the PNP transistor, driven relative to the emitter; continuous collector current is limited to -100 mA and VCE(sat) is specified at IC = -100 mA, IB = -5 mA. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor; for the BC557 column the collector-emitter breakdown is -45 V (IC = -2 mA, IB = 0) and collector power dissipation is 625 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| 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-base breakdown voltage (BC557) | VCBO | -50 | V | IC= -100μA, IE=0 | 1 | ||
| Collector-emitter breakdown voltage (BC557) | VCEO | -45 | V | IC= -2mA, IB=0 | 1 | ||
| Emitter-base breakdown voltage | VEBO | -5 | V | IE= -100μA, IC=0 | 1 | ||
| Collector cut-off current (BC557, base open) | ICBO | -0.1 | μA | VCB= -45 V, IE=0 | 1 | ||
| Collector cut-off current (BC557, base open, emitter-collector) | ICEO | -0.1 | μA | VCE= -40 V, IB=0 | 1 | ||
| Emitter cut-off current | IEBO | -0.1 | μA | VEB= -5 V, IC=0 | 1 | ||
| DC current gain (BC557C, lower limit) | hFE | 420 | VCE=-5V, IC= -2mA | 1 | |||
| DC current gain (BC557C, upper limit) | hFE | 800 | VCE=-5V, IC= -2mA | 1 | |||
| Collector-emitter saturation voltage | VCE(sat) | -0.65 | V | IC=-100mA, IB= -5mA | 1 | ||
| Base-emitter saturation voltage | VBE(sat) | -1 | V | IC= -100mA, IB=-5mA | 1 | ||
| Transition frequency | fT | 150 | MHz | VCE= -5V, IC= -10mA, f = 100MHz | 1 | ||
| Collector-base voltage (BC557) | VCBO | -50 | V | 1 | |||
| Collector-emitter voltage (BC557) | VCEO | -45 | V | 1 | |||
| Emitter-base voltage | VEBO | -5 | V | 1 | |||
| Collector current (continuous) | IC | -100 | mA | 1 | |||
| Collector power dissipation | PC | 625 | mW | 1 | |||
| Junction temperature | TJ | 150 | ℃ | 1 | |||
| Storage temperature | Tstg | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
BC557C - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
bc557c-etched.step/bc557c-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc557c.step/bc557c.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LGE datasheet (4 pp, sha256
3f07b60d7056ca34, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).