component
MMBTA42
Public Made by Adomby adom
hongjiacheng Bipolar (BJT), SOT-23. 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
markdownMMBTA42
hongjiacheng · Bipolar (BJT) · SOT-23
MMBTA42 from hongjiacheng, in a SOT-23. 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 | B | input | Base terminal of the NPN transistor; the datasheet limits emitter-base voltage VEBO to 5.0 V maximum and gives VBE(sat) of 0.9 V maximum at IC=20 mA, IB=2.0 mA. |
| 2 | E | passive | Emitter terminal of the NPN transistor; the datasheet limits emitter-base voltage VEBO to 5.0 V and collector current IC to 0.5 A. |
| 3 | C | passive | Collector terminal of the NPN transistor; the datasheet limits collector-emitter voltage VCEO to 300 V, collector-base voltage VCBO to 300 V, collector current IC to 0.5 A, and collector power dissipation PC to 350 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
MMBTA42 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbta42-etched.step/mmbta42-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbta42.step/mmbta42.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: hongjiacheng datasheet (3 pp, sha256
734f759be2c4599a, retrieved 2026-10-09, 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).