component
MPSA42
Public Made by Adomby adom
ST Semtech 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
markdownMPSA42
ST Semtech · Bipolar (BJT) · TO-92
MPSA42 from ST Semtech, 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 NPN transistor; the datasheet gives VEBO 6 V maximum and a minimum emitter-base breakdown voltage of 6 V at IE = 100 µA. |
| 2 | Base | input | Base terminal of the NPN transistor; the datasheet gives VEBO 6 V maximum and VBE(sat) of 0.9 V maximum at IC = 20 mA, IB = 2 mA. |
| 3 | Collector | passive | Collector terminal of the NPN transistor; the datasheet gives VCEO of 300 V (MPSA42) or 200 V (MPSA43), IC of 500 mA and Ptot of 625 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| 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 |
|---|---|---|---|---|---|---|---|
| DC Current Gain (at VCE = 10 V, IC = 1 mA) | hFE | 25 | VCE = 10 V, IC = 1 mA | 1 | |||
| DC Current Gain (at VCE = 10 V, IC = 10 mA) | hFE | 40 | VCE = 10 V, IC = 10 mA | 1 | |||
| DC Current Gain (at VCE = 10 V, IC = 30 mA) | hFE | 40 | VCE = 10 V, IC = 30 mA | 1 | |||
| Collector Base Cutoff Current (MPSA42) | ICBO | 0.1 | µA | VCB = 200 V | 1 | ||
| Emitter Base Cutoff Current (MPSA42) | IEBO | 0.1 | µA | VEB = 6 V | 1 | ||
| Collector Base Breakdown Voltage (MPSA42) | V(BR)CBO | 300 | V | IC = 100 µA | 1 | ||
| Collector Emitter Breakdown Voltage (MPSA42) | V(BR)CEO | 300 | V | IC = 1 mA | 1 | ||
| Emitter Base Breakdown Voltage | V(BR)EBO | 6 | V | IE = 100 µA | 1 | ||
| Collector Emitter Saturation Voltage | VCE(sat) | 0.5 | V | IC = 20 mA, IB = 2 mA | 1 | ||
| Base Emitter Saturation Voltage | VBE(sat) | 0.9 | V | IC = 20 mA, IB = 2 mA | 1 | ||
| Gain Bandwidth Product | fT | 50 | MHz | IC = 10 mA, VCE = 20 V, f = 100 MHz | 1 | ||
| Collector Output Capacitance (MPSA42) | Cob | 3 | pF | VCB = 20 V, f = 1 MHz | 1 | ||
| Collector Base Voltage (MPSA42) | VCBO | 300 | V | Ta = 25 °C | 1 | ||
| Collector Emitter Voltage (MPSA42) | VCEO | 300 | V | Ta = 25 °C | 1 | ||
| Emitter Base Voltage | VEBO | 6 | V | Ta = 25 °C | 1 | ||
| Collector Current | IC | 500 | mA | Ta = 25 °C | 1 | ||
| Power Dissipation | Ptot | 625 | mW | Ta = 25 °C | 1 | ||
| Junction Temperature | Tj | 150 | °C | 1 | |||
| Storage Temperature Range | Tstg | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
MPSA42 - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
mpsa42-etched.step/mpsa42-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mpsa42.step/mpsa42.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (2 pp, sha256
61ee4a17f6d8d818, retrieved 2026-10-17, 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).