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MMBT3904E

Public Made by Adom

by adom

ST Semtech Bipolar (BJT), SOT-523. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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mmbt3904e-etched.glb mmbt3904e: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904e-etched.step mmbt3904e: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
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mmbt3904e.glb plain STEP: one free product with face colours (generated model was nested; tscircuit read it white) · Ray 17d ago
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mmbt3904e.step plain STEP: one free product with face colours (generated model was nested; tscircuit read it white) · Ray 17d ago
package.json mmbt3904e: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
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MMBT3904E

ST Semtech · Bipolar (BJT) · SOT-523

MMBT3904E from ST Semtech, in a SOT-523. 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; emitter-base voltage limited to 6 V (VEBO) and base saturation voltage 0.65 to 0.85 V at IC = 10 mA, IB = 1 mA.
2 E passive Emitter; common terminal of the NPN transistor, with VEBO max 6 V and VCEO max 40 V relative to the collector.
3 C passive Collector; VCBO 60 V, VCEO 40 V and continuous collector current IC up to 200 mA.

Key specifications

Parameter Value
Manufacturer ST Semtech
Package SOT-523
Category Transistors/Thyristors
Pins 3

CAD (KiCad official)

  • Symbol: MMBT3904E
  • Footprint: Package_TO_SOT_SMD:SOT-523
  • 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: mmbt3904e-etched.step / mmbt3904e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt3904e.step / mmbt3904e.glb are the bare package body.

Provenance

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

  • Datasheet: ST Semtech datasheet (5 pp, sha256 e6aec3f169c23a6f, retrieved 2026-10-09, 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