component
BD438
Public Made by Adomby adom
STMicroelectronics Bipolar (BJT), TO-126-3. 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
markdownBD438
STMicroelectronics · Bipolar (BJT) · TO-126-3
BD438 from STMicroelectronics, in a TO-126-3. 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 | Base | input | Control input terminal with maximum base current of 1 A |
| 2 | Collector | output | Collector terminal with maximum collector current of 4 A and collector-emitter voltage of 45 V |
| 3 | Emitter | output | Emitter terminal with maximum emitter-base voltage of 5 V |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-126-3 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
BD438 - Footprint:
Package_TO_SOT_THT:TO-126-3_Vertical - 3D model: TO-126-3 (KiCad packages3D, STEP)
- 3D model files:
bd438-etched.step/bd438-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bd438.step/bd438.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (4 pp, sha256
eff0c287adc6d211, retrieved 2026-09-24, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).