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MMBT3904T

Public Made by Adom

by adom

CBI 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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docs Publish 0.1.0 · Ray 25d ago
viewers mmbt3904t: viewers · Ray 25d ago
mmbt3904t-etched.glb mmbt3904t: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904t-etched.step mmbt3904t: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904t-hero.glb mmbt3904t: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904t-hero.overlay.json mmbt3904t: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904t.glb plain STEP: one free product with face colours (generated model was nested; tscircuit read it white) · Ray 17d ago
mmbt3904t.kicad_mod Publish 0.1.0 · Ray 25d ago
mmbt3904t.kicad_sym Publish 0.1.0 · Ray 25d ago
mmbt3904t.lbr Publish 0.1.0 · Ray 25d ago
mmbt3904t.step plain STEP: one free product with face colours (generated model was nested; tscircuit read it white) · Ray 17d ago
package.json mmbt3904t: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
page.json mmbt3904t: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
README.md Publish 0.1.0 · Ray 25d ago

MMBT3904T

CBI · Bipolar (BJT) · SOT-523

MMBT3904T from CBI, 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 BASE passive Base terminal of the NPN transistor; the datasheet gives emitter-base breakdown V(BR)EBO of 6 V minimum at IE=10µA and the emitter-base voltage rating VEBO of 6 V.
2 EMITTER passive Emitter terminal of the NPN transistor; the datasheet limits the emitter-base voltage to VEBO 6 V and the collector current to IC 200 mA.
3 COLLECTOR passive Collector terminal of the NPN transistor; the datasheet limits the collector-emitter voltage to VCEO 40 V, collector-base voltage to VCBO 60 V, collector current to 200 mA, and collector power dissipation PC to 150 mW.

Key specifications

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

CAD (KiCad official)

  • Symbol: MMBT3904T
  • 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: mmbt3904t-etched.step / mmbt3904t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt3904t.step / mmbt3904t.glb are the bare package body.

Provenance

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

  • Datasheet: CBI datasheet (2 pp, sha256 1122ee9cb770e0c0, retrieved 2026-10-09, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF