# BAS20

**Nexperia** · Switching Diodes · SOT-23

BAS20 from Nexperia, 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 high-voltage switching diode; the datasheet gives no pin-specific limit, so the device limits apply (VR 150 V, IF 200 mA continuous). |
| 2 | n.c. | unconnected | Not connected; the datasheet assigns no electrical function to this pin. |
| 3 | K | passive | Cathode of the high-voltage switching diode; the datasheet gives no pin-specific limit, so the device limits apply (VR 150 V, IF 200 mA continuous). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| 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 |
|---|---|---|---|---|---|---|---|
| Ambient temperature | Tamb | -55 |  | 150 | °C |  | 2 |
| Repetitive peak reverse voltage | VRRM |  |  | 200 | V |  | 2 |
| Reverse voltage | VR |  |  | 150 | V |  | 2 |
| Continuous forward current | IF |  |  | 200 | mA |  | 2 |
| Non-repetitive peak forward current | IFSM |  |  | 9 | A | tp = 1 µs; square wave; Tj(init) = 25 °C | 2 |
| Non-repetitive peak forward current | IFSM |  |  | 3 | A | tp = 100 µs; square wave; Tj(init) = 25 °C | 2 |
| Non-repetitive peak forward current | IFSM |  |  | 1.7 | A | tp = 10 ms; square wave; Tj(init) = 25 °C | 2 |
| Repetitive peak forward current | IFRM |  |  | 625 | mA |  | 2 |
| Total power dissipation | Ptot |  |  | 250 | mW | Tamb ≤ 25 °C; device mounted on an FR4 printed-circuit board | 2 |
| Junction temperature | Tj |  |  | 150 | °C |  | 2 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 2 |
| Thermal resistance from junction to ambient | Rth(j-a) |  |  | 500 | K/W | Device mounted on an FR4 printed-circuit board | 2 |
| Thermal resistance from junction to solder point | Rth(j-sp) |  |  | 330 | K/W |  | 2 |
| Forward voltage | VF |  |  | 1 | V | IF = 100 mA; Tj = 25 °C | 3 |
| Forward voltage | VF |  |  | 1.25 | V | IF = 200 mA; Tj = 25 °C | 3 |
| Reverse current | IR |  |  | 100 | nA | VR = 150 V; Tj = 25 °C | 3 |
| Reverse current | IR |  |  | 100 | µA | VR = 150 V; Tj = 150 °C | 3 |
| Diode capacitance | Cd |  |  | 5 | pF | VR = 0 V; f = 1 MHz; Tamb = 25 °C | 3 |
| Reverse recovery time | trr |  |  | 50 | ns | IF = 30 mA; IR = 30 mA; RL = 100 Ω; IR(meas) = 3 mA; Tamb = 25 °C | 3 |

## CAD (KiCad official)

- Symbol: `BAS20`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bas20-etched.step` / `bas20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bas20.step` / `bas20.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/BAS20.pdf) (8 pp, sha256 `419ab5fe990b3cf9`, retrieved 2026-10-18, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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](docs/bas20-datasheet.pdf)