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BAS21AW
Public Made by Adomby adom
ST Semtech Switching Diodes, SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownBAS21AW
ST Semtech · Switching Diodes · SOT-323
BAS21AW from ST Semtech, 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 | K1 | passive | Cathode of diode 1 in the dual BAS21AW, with 250 V maximum reverse voltage and 200 mA continuous forward current. |
| 2 | K2 | passive | Cathode of diode 2 in the dual BAS21AW, with 250 V maximum reverse voltage and 200 mA continuous forward current. |
| 3 | A | passive | Common anode of both diodes in the BAS21AW (pin 3 is the shared top pin of the SOT-323 package). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| Package | SOT-323 |
| 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 Voltage | VR | 250 | V | BAS21W/AW/CW/SW | 1 | ||
| Continuous Forward Current | IF(AV) | 200 | mA | 1 | |||
| Repetitive Peak Forward Current | IFRM | 625 | mA | 1 | |||
| Non-repetitive Peak Forward Surge Current | IFSM | 0.5 | A | at t = 1 s | 1 | ||
| Non-repetitive Peak Forward Surge Current | IFSM | 2.5 | A | at t = 1 µs | 1 | ||
| Total Device Dissipation | Ptot | 250 | mW | 1 | |||
| Junction and Storage Temperature Range | Tj, Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 500 | ℃/W | Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout | 1 | ||
| Reverse Breakdown Voltage | V(BR)R | 250 | V | at IR = 100 µA, BAS21W/AW/CW/SW | 2 | ||
| Forward Voltage | VF | 1 | V | at IF = 100 mA | 2 | ||
| Forward Voltage | VF | 1.25 | V | at IF = 200 mA | 2 | ||
| Reverse Current | IR | 0.1 | µA | at VR = 200 V, BAS21W/AW/CW/SW | 2 | ||
| Reverse Current | IR | 100 | µA | at VR = 200 V, Tj = 150℃, BAS21W/AW/CW/SW | 2 | ||
| Total Capacitance | Ctot | 5 | pF | at VR = 0, f = 1 MHz | 2 | ||
| Reverse Recovery Time | trr | 50 | ns | at IF = IR = 30 mA, RL = 100 Ω, Irr = 0.1 X IR | 2 |
CAD (KiCad official)
- Symbol:
BAS21AW - Footprint:
Package_TO_SOT_SMD:SOT-323_SC-70 - 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files:
bas21aw-etched.step/bas21aw-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bas21aw.step/bas21aw.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (4 pp, sha256
91e6b2f1ba62b8b7, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).