# BAP50-04W

**YFW** · Diodes - General Purpose · SOT-323

BAP50-04W from YFW, 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 | Anode | passive | Anode terminal of one of the two planar PIN diodes in series; each diode is rated for 50 V continuous reverse voltage and 50 mA continuous forward current. |
| 2 | Cathode | passive | Cathode terminal of the other PIN diode in the series pair; each diode is rated for 50 V continuous reverse voltage and 50 mA continuous forward current. |
| 3 | Common connection | passive | Common connection node of the two series-configured diodes as labelled in the datasheet pinout; the datasheet gives no separate electrical limit for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| 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 |
|---|---|---|---|---|---|---|---|
| continuous reverse voltage | VR |  |  | 50 | V |  | 1 |
| continuous forward current | IF |  |  | 50 | mA |  | 1 |
| total power dissipation | Ptot |  |  | 240 | mW | Ts = 90 °C | 1 |
| storage temperature | Tstg | -65 |  | 150 | °C |  | 1 |
| junction temperature | Tj | -65 |  | 150 | °C |  | 1 |
| forward voltage | VF |  | 0.95 | 1.1 | V | IF = 50 mA | 1 |
| reverse voltage | VR | 50 |  |  | V | IR = 10 µA | 1 |
| reverse current | IR |  |  | 100 | nA | VR = 50 V | 1 |
| diode capacitance | Cd |  | 0.35 | 0.6 | pF | VR = 1 V; f = 1 MHz | 1 |
| diode capacitance | Cd |  | 0.3 | 0.5 | pF | VR = 5 V; f = 1 MHz | 1 |
| diode forward resistance | rD |  | 25 | 40 | Ω | IF = 0.5 mA; f = 100 MHz; note 1 | 1 |
| diode forward resistance | rD |  | 14 | 25 | Ω | IF = 1 mA; f = 100 MHz; note 1 | 1 |
| diode forward resistance | rD |  | 3 | 5 | Ω | IF = 10 mA; f = 100 MHz; note 1 | 1 |
| thermal resistance from junction to soldering point | Rth j-s |  | 250 |  | K/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BAP50-04W`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `bap50-04w-etched.step` / `bap50-04w-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bap50-04w.step` / `bap50-04w.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603387664679133184) (3 pp, sha256 `1afaea42b2c4f2c4`, retrieved 2026-10-18, tier: lcsc)
- **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/bap50-04w-datasheet.pdf)