# BAS21-AU

**PANJIT International** · Switching Diodes · SOT-23

BAS21-AU from PANJIT International, 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 switching diode; BAS21-AU is rated for 200 V reverse voltage (250 V peak) and 200 mA average rectified current. |
| 2 | NC | unconnected | No internal connection; the SOT-23 package diagram shows no connection to the diode on this pin. |
| 3 | K | passive | Cathode of the single switching diode; the package diagram shows the diode's cathode bar tied to this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| 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 Voltage | VR |  |  | 200 | V |  | 1 |
| Peak Reverse Voltage | VRM |  |  | 250 | V |  | 1 |
| Rectified Current (Average) | IO |  |  | 200 | mA | Half wave rectification with resistive load and f >50Hz | 1 |
| Peak Forward Surge Current | IFSM |  |  | 2.5 | A | tp=1s, single half sine-wave superimposed on rated load | 1 |
| Power Dissipation | PTOT |  |  | 350 | mW | Derate above 25 oC | 1 |
| Maximum Forward Voltage | VF |  |  | 1 | V | @100mA | 1 |
| Maximum DC Reverse Current at rated DC blocking voltage | IR |  |  | 1 | A | At rated DC blocking voltage, TJ=25 oC | 1 |
| Maximum Reverse Recovery Time | TRR |  |  | 50 | nS | From IF=10mA to IR=1mA, VR=6V, RL=100 (Note 2) | 1 |
| Operating Junction Temperature and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | oC |  | 1 |
| Typical Junction Capacitance | CJ |  | 1.5 |  | pF | VR=0, f=1MHz (Note 1) | 1 |
| Typical Thermal Resistance, junction to ambient | RθJA |  | 357 |  | oC/W | FR-4 PCB, single-sided copper, 100cm2 copper pad area (Note 3) | 1 |

## CAD (KiCad official)

- Symbol: `BAS21-AU`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bas21-au-etched.step` / `bas21-au-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bas21-au.step` / `bas21-au.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8551858715402645504) (5 pp, sha256 `7b37c736c15a1f26`, retrieved 2026-10-19, 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/bas21-au-datasheet.pdf)