component

MMBT5550

Public Made by Adom

by adom

Changjing Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
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docs Publish 0.1.0 · Ray 20d ago
viewers mmbt5550: viewers · Ray 20d ago
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mmbt5550-etched.step mmbt5550: factory component page (tier=lcsc) · Ray 20d ago
mmbt5550-hero.glb mmbt5550: hero GLB from the etched model (keeps the MPN mark) · Ray 20d ago
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MMBT5550

Changjing · Bipolar (BJT) · SOT-23

MMBT5550 from Changjing, in a SOT-23. 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 gives VBE(sat) of 1 V at IC=10 mA, IB=1 mA and 1.2 V at IC=50 mA, IB=5 mA.
2 EMITTER passive Emitter terminal of the NPN transistor; the absolute maximum emitter-base voltage VEBO is 6 V.
3 COLLECTOR passive Collector terminal of the NPN transistor; the datasheet limits are VCEO 140 V, VCBO 160 V and IC 600 mA.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-23
Category Transistors/Thyristors
Pins 3

CAD (KiCad official)

  • Symbol: MMBT5550
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbt5550-etched.step / mmbt5550-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt5550.step / mmbt5550.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (3 pp, sha256 479c62a3732986ae, 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