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MMBT3904M 1N

Public Made by Adom

by adom

Changjing Bipolar (BJT), SOT-723. 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
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mmbt3904m-1n-etched.glb mmbt3904m-1n: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904m-1n-etched.step mmbt3904m-1n: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904m-1n-hero.glb mmbt3904m-1n: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904m-1n-hero.overlay.json mmbt3904m-1n: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
mmbt3904m-1n.glb plain STEP: one free product with face colours (generated model was nested; tscircuit read it white) · Ray 17d ago
mmbt3904m-1n.kicad_mod Publish 0.1.0 · Ray 25d ago
mmbt3904m-1n.kicad_sym Publish 0.1.0 · Ray 25d ago
mmbt3904m-1n.lbr Publish 0.1.0 · Ray 25d ago
mmbt3904m-1n.step plain STEP: one free product with face colours (generated model was nested; tscircuit read it white) · Ray 17d ago
package.json mmbt3904m-1n: etched from the flattened plain STEP (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
page.json mmbt3904m-1n: 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

MMBT3904M 1N

Changjing · Bipolar (BJT) · SOT-723

MMBT3904M 1N from Changjing, in a SOT-723. 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 Base terminal of the NPN transistor; the datasheet rates the emitter-base voltage VEBO at 6 V and gives a base-emitter saturation voltage of 0.65 to 0.85 V at IC=10 mA, IB=1 mA.
2 EMITTER passive Emitter terminal of the NPN transistor; the datasheet rates the emitter-base breakdown voltage V(BR)EBO at 6 V minimum at IE=10 µA.
3 COLLECTOR passive Collector terminal of the NPN transistor; the datasheet rates the collector-emitter voltage VCEO at 40 V and the continuous collector current IC at 0.2 A.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-723
Category Transistors/Thyristors
Pins 3

CAD (KiCad official)

  • Symbol: MMBT3904M 1N
  • Footprint: Package_TO_SOT_SMD:SOT-723
  • 3D model: SOT-723, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.5 mm nominal SOT-723 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: mmbt3904m-1n-etched.step / mmbt3904m-1n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt3904m-1n.step / mmbt3904m-1n.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (4 pp, sha256 d122b2d7b26b65bc, 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