component
BAS21A
Public Made by Adomby adom
Changjing Switching Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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BAS21A
Changjing · Switching Diodes · SOT-23
BAS21A from Changjing, 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 | K1 | passive | Cathode of the first diode of the BAS21A dual common-anode switching diode (VRRM 250 V, IFM 400 mA per the datasheet ratings). |
| 2 | K2 | passive | Cathode of the second diode of the BAS21A dual common-anode switching diode (VRRM 250 V, IFM 400 mA per the datasheet ratings). |
| 3 | A | passive | Common anode of both diodes in the BAS21A (marking JS2), shared connection of the two diodes. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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) | 250 | V | IR= 100µA | 1 | ||
| Reverse voltage leakage current | IR | 0.1 | µA | VR=200V | 1 | ||
| Forward voltage | VF | 1000 | mV | IF=100mA | 1 | ||
| Forward voltage | VF | 1250 | mV | IF=200mA | 1 | ||
| Diode capacitance | CD | 5 | pF | VR=0V, f=1MHz | 1 | ||
| Reverse recovery time | trr | 50 | ns | IF=IR=30mA, Irr=0.1×IR, RL=100Ω | 1 | ||
| Repetitive peak reverse voltage | VRRM | 250 | V | Ta=25℃ | 1 | ||
| Non-repetitive peak forward surge current | IFSM | 2.5 | A | t=8.3ms | 1 | ||
| Repetitive peak forward surge current | IFRM | 625 | mA | Ta=25℃ | 1 | ||
| Power dissipation | PD | 225 | mW | Ta=25℃ | 1 | ||
| Thermal resistance junction to ambient | RθJA | 555 | ℃/W | 1 | |||
| Junction temperature | TJ | 150 | ℃ | 1 | |||
| Storage temperature range | TSTG | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
BAS21A - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
bas21a-etched.step/bas21a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bas21a.step/bas21a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
15a308ba5c95c43a, 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).
# BAS21A
**Changjing** · Switching Diodes · SOT-23
BAS21A from Changjing, 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 | K1 | passive | Cathode of the first diode of the BAS21A dual common-anode switching diode (VRRM 250 V, IFM 400 mA per the datasheet ratings). |
| 2 | K2 | passive | Cathode of the second diode of the BAS21A dual common-anode switching diode (VRRM 250 V, IFM 400 mA per the datasheet ratings). |
| 3 | A | passive | Common anode of both diodes in the BAS21A (marking JS2), shared connection of the two diodes. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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) | 250 | | | V | IR= 100µA | 1 |
| Reverse voltage leakage current | IR | | | 0.1 | µA | VR=200V | 1 |
| Forward voltage | VF | | | 1000 | mV | IF=100mA | 1 |
| Forward voltage | VF | | | 1250 | mV | IF=200mA | 1 |
| Diode capacitance | CD | | | 5 | pF | VR=0V, f=1MHz | 1 |
| Reverse recovery time | trr | | | 50 | ns | IF=IR=30mA, Irr=0.1×IR, RL=100Ω | 1 |
| Repetitive peak reverse voltage | VRRM | | | 250 | V | Ta=25℃ | 1 |
| Non-repetitive peak forward surge current | IFSM | | | 2.5 | A | t=8.3ms | 1 |
| Repetitive peak forward surge current | IFRM | | | 625 | mA | Ta=25℃ | 1 |
| Power dissipation | PD | | | 225 | mW | Ta=25℃ | 1 |
| Thermal resistance junction to ambient | RθJA | | | 555 | ℃/W | | 1 |
| Junction temperature | TJ | | | 150 | ℃ | | 1 |
| Storage temperature range | TSTG | -55 | | 150 | ℃ | | 1 |
## CAD (KiCad official)
- Symbol: `BAS21A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bas21a-etched.step` / `bas21a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bas21a.step` / `bas21a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586179733029859328) (4 pp, sha256 `15a308ba5c95c43a`, 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](docs/bas21a-datasheet.pdf)