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FS3401LT1 X1FS21

Public Made by Adom

by adom

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

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FS3401LT1 X1FS21

FOSAN · MOSFETs · SOT-23-3L

FS3401LT1 X1FS21 from FOSAN, in a SOT-23-3L. 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 ±12 V, with threshold VGS(th) of -0.6 V to -2 V at ID = -250 uA.
2 S passive Source of the P-channel MOSFET; continuous drain current is -4.5 A and pulsed drain current is -20 A.
3 D passive Drain; drain-source voltage rated -30 V with RDS(ON) of 40 mΩ typ (46 mΩ max) at VGS = -10 V, ID = -4.2 A.

Key specifications

Parameter Value
Manufacturer FOSAN
Package SOT-23-3L
Category Triode/MOS Tube/Transistor
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 V ID = -250uA, VGS=0V 2
Gate Threshold Voltage VGS(th) -2 -0.6 V ID = -250uA, VGS= VDS 2
Diode Forward Voltage Drop VSD -1 V IS= -1A, VGS=0V 2
Zero Gate Voltage Drain Current IDSS -1 uA VGS=0V, VDS= -24V 2
Zero Gate Voltage Drain Current (55C) IDSS -5 uA VGS=0V, VDS= -24V, TA=55℃ 2
Gate Body Leakage IGSS 100 nA VGS=+12V, VDS=0V 2
Static Drain-Source On-State Resistance RDS(ON) 40 46 mΩ ID= -4.2A, VGS= -10V 2
Static Drain-Source On-State Resistance RDS(ON) 50 58 mΩ ID= -2A, VGS= -4.5V 2
Static Drain-Source On-State Resistance RDS(ON) 80 85 mΩ ID= -1A, VGS= -2.5V 2
Drain-Source Voltage BVDSS -30 V 1
Gate-Source Voltage VGS 12 V 1
Drain Current (continuous) ID -4.5 A 1
Drain Current (pulsed) IDM -20 A 1
Total Device Dissipation PD 1500 mW TA=25℃ 1
Junction Temperature TJ 150 ℃ 1
Storage Temperature Tstg -55 150 ℃ 1
Input Capacitance CISS 954 pF VGS=0V, VDS= -15V, f=1MHz 2
Output Capacitance COSS 115 pF VGS=0V, VDS= -15V, f=1MHz 2
Turn-ON Time t(on) 6 ns VDS= -15V, VGS= -10V, RGEN=6Ω 2
Turn-OFF Time t(off) 38 ns VDS= -15V, VGS= -10V, RGEN=6Ω 2

CAD (KiCad official)

  • Symbol: FS3401LT1 X1FS21
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3L (KiCad packages3D, STEP)
  • 3D model files: fs3401lt1-x1fs21-etched.step / fs3401lt1-x1fs21-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); fs3401lt1-x1fs21.step / fs3401lt1-x1fs21.glb are the bare package body.

Provenance

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

  • Datasheet: FOSAN datasheet (3 pp, sha256 139fcdbc14c95e27, retrieved 2026-10-22, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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