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MMBT3904Q

Public Made by Adom

by adom

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

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MMBT3904Q

Yangzhou Yangjie Elec Tech · Bipolar (BJT) · SOT-23

MMBT3904Q from Yangzhou Yangjie Elec Tech, 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 B input Base of the NPN transistor, shown at the bottom-left lead of the SOT-23 diagram.
2 E passive Emitter of the NPN transistor, shown at the bottom-right lead; VEBO max 6.0 V.
3 C passive Collector of the NPN transistor, shown at the single top lead; VCEO 40 V, VCBO 60 V, IC continuous 200 mA max.

Key specifications

Parameter Value
Manufacturer Yangzhou Yangjie Elec Tech
Package SOT-23
Category Transistors/Thyristors
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Collector-Base Voltage VCBO 60 V 1
Collector-Emitter Voltage VCEO 40 V 1
Emitter-Base Voltage VEBO 6 V 1
Collector Current -Continuous IC 200 mA 1
Total Device Dissipation PD 300 mW Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch. 1
Junction Temperature Tj -55 150 ℃ 1
Storage Temperature TSTG -55 150 ℃ 1
Collector-emitter breakdown voltage V(BR)CEO 40 Vdc IC=1.0mAdc, IB=0 2
Collector-base breakdown voltage V(BR)CBO 60 Vdc IC=10uAdc, IE=0 2
Emitter-base breakdown voltage V(BR)EBO 6 Vdc IE=10μAdc, IC=0 2
Collector cut-off current ICBO 50 nAdc VCB=60Vdc, IE=0 2
DC current gain hFE 40 VCE=1Vdc, IC=0.1mAdc 2
DC current gain hFE 70 VCE=1Vdc, IC=1.0mAdc 2
DC current gain hFE 100 300 VCE=1Vdc, IC=10mAdc 2
DC current gain hFE 60 VCE=1Vdc, IC=50mAdc 2
DC current gain hFE 30 VCE=1Vdc, IC=100mAdc 2
Collector-emitter saturation voltage VCE(sat) 0.2 Vdc IC=10mAdc, IB=1.0mAdc 2
Collector-emitter saturation voltage VCE(sat) 0.3 Vdc IC=50mAdc, IB=5.0mAdc 2
Base-emitter saturation voltage VBE(sat) 0.65 0.85 Vdc IC=10mAdc, IB=1.0mAdc 2
Base-emitter saturation voltage VBE(sat) 0.95 Vdc IC=50mAdc, IB=5.0mAdc 2
Output Capacitance Cobo 4 pF VCB=5.0Vdc, f=1.0MHz, IE=0 2
Input Capacitance Cibo 8 pF VEB=0.5Vdc, f=1.0MHz, IC=0 2
Delay time td 35 ns VCC=3.0Vdc, VBE=0.5Vdc, IC=10mAdc, IB1=1.0mAdc 2
Rise time tr 35 ns 2
Storage time ts 200 ns VCC=3.0Vdc, IC=10mAdc, IB1=IB2=1.0mAdc 2
Fall time tf 50 ns 2
Thermal Resistance Junction to Ambient RthJA 357 K/W Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch. 1

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin ●Terminals: Tin plated leads, solderable per J-STD-002 and JESD22- B102 1

CAD (KiCad official)

  • Symbol: MMBT3904Q
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbt3904q-etched.step / mmbt3904q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt3904q.step / mmbt3904q.glb are the bare package body.

Provenance

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

  • Datasheet: Yangzhou Yangjie Elec Tech datasheet (5 pp, sha256 8d673d288d9fcf50, retrieved 2026-10-17, 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