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BLM3404

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BL Shanghai Belling MOSFETs, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BLM3404

BL Shanghai Belling · MOSFETs · SOT-23

BLM3404 from BL Shanghai Belling, 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 G input Gate; gate-source voltage limited to ±20V absolute maximum, with threshold VGS(th) of 1.2V min to 2.4V max at ID=250μA.
2 S passive Source; continuous drain current is 5.8A and pulsed drain current is 20A maximum.
3 D passive Drain; drain-source voltage is 30V maximum and RDS(ON) is below 31mΩ at VGS=10V and below 43mΩ at VGS=4.5V.

Key specifications

Parameter Value
Manufacturer BL Shanghai Belling
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
Drain-Source Breakdown Voltage BVDSS 30 33 V VGS=0V ID=250μA 1
Zero Gate Voltage Drain Current IDSS 1 μA VDS=30V,VGS=0V 1
Gate-Body Leakage Current IGSS 100 nA VGS=±20V,VDS=0V 2
Gate Threshold Voltage VGS(th) 1.2 1.6 2.4 V VDS=VGS,ID=250μA 2
Drain-Source On-State Resistance RDS(ON) 25.5 31 mΩ VGS=10V, ID=5A 2
Drain-Source On-State Resistance RDS(ON) 36 43 mΩ VGS=4.5V, ID=4A 2
Diode Forward Voltage VSD 1.2 V VGS=0V,IS=6A 2
Diode Forward Current IS 6 A 2
Drain-Source Voltage VDS 30 V 1
Gate-Source Voltage VGS -20 20 V 1
Drain Current-Continuous ID 5.8 A 1
Drain Current-Pulsed IDM 20 A Note 1: repetitive rating, pulse width limited by max junction temperature 1
Maximum Power Dissipation PD 1.4 W 1
Operating Junction and Storage Temperature Range TJ,TSTG -55 150 ℃ 1
Thermal Resistance, Junction-to-Ambient RθJA 89 ℃/W Note 2: surface mounted on FR4 board, t ≤ 10 sec 1
Forward Transconductance gFS 15 S VDS=5V,ID=5A 2
Input Capacitance Clss 255 PF VDS=15V,VGS=0V, F=1.0MHz 2
Output Capacitance Coss 45 PF VDS=15V,VGS=0V, F=1.0MHz 2
Reverse Transfer Capacitance Crss 35 PF VDS=15V,VGS=0V, F=1.0MHz 2
Turn-on Delay Time td(on) 4.5 nS VDD=15V, RL=3Ω, VGS=10V, RGEN=3Ω 2
Turn-on Rise Time tr 2.5 nS VDD=15V, RL=3Ω, VGS=10V, RGEN=3Ω 2
Turn-Off Delay Time td(off) 14.5 nS VDD=15V, RL=3Ω, VGS=10V, RGEN=3Ω 2
Turn-Off Fall Time tf 3.5 nS VDD=15V, RL=3Ω, VGS=10V, RGEN=3Ω 2
Total Gate Charge Qg 5.2 nC VDS=15V,ID=6A, VGS=10V 2
Gate-Source Charge Qgs 0.85 nC VDS=15V,ID=6A, VGS=10V 2
Gate-Drain Charge Qgd 1.3 nC VDS=15V,ID=6A, VGS=10V 2

CAD (KiCad official)

  • Symbol: BLM3404
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: blm3404-etched.step / blm3404-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); blm3404.step / blm3404.glb are the bare package body.

Provenance

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

  • Datasheet: BL Shanghai Belling datasheet (6 pp, sha256 8d8ff09c2a28ee96, 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