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BAS21Q-7-F

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Diodes Incorporated Switching Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BAS21Q-7-F

Diodes Incorporated · Switching Diodes · SOT-23

BAS21Q-7-F from Diodes Incorporated, 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 A passive Anode of the single diode, shown at the bottom-left terminal of the top-view internal schematic; reverse voltage rating VRRM 250 V for BAS21.
2 NC unconnected Bottom-right terminal, shown with no internal connection in the top-view internal schematic.
3 K passive Cathode of the single diode, shown at the top terminal of the top-view internal schematic; reverse voltage rating VRRM 250 V for BAS21.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23
Category Diodes
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
Reverse Breakdown Voltage V(BR)R 250 V IR = 100µA 2
Forward Voltage VF 1 V IF = 100mA 2
Forward Voltage VF 1.25 V IF = 200mA 2
Reverse Current IR 100 nA @ Rated DC Blocking Voltage; TJ = +25C 2
Reverse Current IR 15 µA @ Rated DC Blocking Voltage; TJ = +100C 2
Total Capacitance CT 5 pF VR = 0, f = 1.0MHz 2
Reverse Recovery Time trr 50 ns IF = IR = 30mA, Irr = 0.1 x IR, RL = 100Ω 2
Repetitive Peak Reverse Voltage VRRM 250 V 2
Working Peak Reverse Voltage VRWM 200 V 2
DC Blocking Voltage VR 200 V 2
RMS Reverse Voltage VR(RMS) 141 V 2
Forward Continuous Current IFM 400 mA Note 5 2
Average Rectified Output Current IO 200 mA Note 5 2
Non-Repetitive Peak Forward Surge Current IFSM 2.5 A t = 1.0µs 2
Non-Repetitive Peak Forward Surge Current IFSM 0.5 A t = 1.0s 2
Repetitive Peak Forward Surge Current IFRM 625 mA Note 5 2
Power Dissipation PD 250 mW Note 5: FR-4 board, one inch square, 2oz copper pad 2
Thermal Resistance Junction to Ambient Air RJA 500 °C/W Note 5: FR-4 board, one inch square, 2oz copper pad 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 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: Solderable per MIL-STD-202, Method 208. Lead-Free Plating (Matte Tin Finish Annealed over Alloy 42 1

CAD (KiCad official)

  • Symbol: BAS21Q-7-F
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bas21q-7-f-etched.step / bas21q-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bas21q-7-f.step / bas21q-7-f.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (5 pp, sha256 7e7747c89547ad03, retrieved 2026-10-18, 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