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BSS138WQ-7-F

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Diodes Incorporated MOSFETs, SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BSS138WQ-7-F

Diodes Incorporated · MOSFETs · SOT-323

BSS138WQ-7-F from Diodes Incorporated, in a SOT-323. 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 (VGSS) with threshold VGS(TH) of 0.5V min to 1.5V max at ID = 250µA.
2 S passive Source; continuous body diode current up to 0.28A (IS) flows through this terminal.
3 D passive Drain; drain-source voltage rated 50V (VDSS) with continuous drain current of 0.28A at TA = +25°C.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-323
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 50 V VGS = 0V, ID = 250µA 2
Zero Gate Voltage Drain Current IDSS 1 µA VDS = 50V, VGS = 0V 2
Gate-Body Leakage IGSS 100 nA VGS = 20V, VDS = 0V 2
Gate Threshold Voltage VGS(TH) 0.5 1.5 V VDS = VGS, ID = 250µA 2
Static Drain-Source On-Resistance RDS(ON) 1.2 3.5 Ω VGS = 10V, ID = 0.22A 2
Diode Forward Voltage VSD 0.8 1.2 V VGS = 0V, IS = 0.2A 2
Drain-Source Voltage VDSS 50 V TA = +25°C 2
Gate-Source Voltage VGSS 20 V TA = +25°C 2
Continuous Drain Current ID 0.28 A VGS = 10V, Steady State, TA = +25°C (Note 6) 2
Continuous Drain Current ID 0.22 A VGS = 10V, Steady State, TA = +70°C (Note 6) 2
Maximum Body Diode Continuous Current IS 0.28 A TA = +25°C 2
Pulsed Drain Current IDM 1 A 10μs Pulse, Duty Cycle = 1% 2
Total Power Dissipation PD 0.4 W Note 5, minimum recommended pad 2
Total Power Dissipation PD 0.5 W Note 6, 1inch square copper pad 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
Thermal Resistance, Junction to Ambient RθJA 279 °C/W Note 5, minimum recommended pad 2
Thermal Resistance, Junction to Ambient RθJA 226 °C/W Note 6, 1inch square copper pad 2
Input Capacitance Ciss 48 pF VDS = 25V, VGS = 0V, f = 1.0MHz 2
Output Capacitance Coss 10 pF VDS = 25V, VGS = 0V, f = 1.0MHz 2
Reverse Transfer Capacitance Crss 6 pF VDS = 25V, VGS = 0V, f = 1.0MHz 2
Gate Resistance Rg 37.5 Ω VDS = 0V, VGS = 0V, f = 1.0MHz 2
Total Gate Charge Qg 1.5 nC VGS = 10V, VDS = 25V, ID = 0.2A 2
Gate-Source Charge Qgs 0.2 nC VGS = 10V, VDS = 25V, ID = 0.2A 2
Gate-Drain Charge Qgd 0.3 nC VGS = 10V, VDS = 25V, ID = 0.2A 2
Turn-On Delay Time tD(ON) 3 ns VDD = 30V, ID = 0.2A, VGS = 10V, Rg = 150Ω 2
Turn-On Rise Time tR 9 ns VDD = 30V, ID = 0.2A, VGS = 10V, Rg = 150Ω 2
Turn-Off Delay Time tD(OFF) 43 ns VDD = 30V, ID = 0.2A, VGS = 10V, Rg = 150Ω 2
Turn-Off Fall Time tF 14 ns VDD = 30V, ID = 0.2A, VGS = 10V, Rg = 150Ω 2
Reverse Recovery Time tRR 17.6 ns IF = 0.2A, di/dt = 100A/µs 2
Reverse Recovery Charge QRR 9.5 nC IF = 0.2A, di/dt = 100A/µs 2

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: Matte Tin Finish Annealed over Alloy 42 Leadframe (Lead Free Plating). Solderable per MIL-STD-202, Method 208 1

CAD (KiCad official)

  • Symbol: BSS138WQ-7-F
  • Footprint: Package_TO_SOT_SMD:SOT-323_SC-70
  • 3D model: SOT-323 (KiCad packages3D, STEP)
  • 3D model files: bss138wq-7-f-etched.step / bss138wq-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bss138wq-7-f.step / bss138wq-7-f.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 61fbc577f0fbc5d5, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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