# SS8550

**hongjiacheng** · Bipolar (BJT) · SOT-23

SS8550 from hongjiacheng, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | B | input | Base terminal of the PNP BJT. Drive current into base (negative relative to emitter for PNP forward-active operation). VBE(sat) max -1.2V at IC=-800mA, IB=-80mA. |
| 2 | E | passive | Emitter terminal of the PNP BJT. Typically tied to the higher potential (e.g. VCC) in high-side switching or common-emitter configurations. VEBO max -5.0V. |
| 3 | C | passive | Collector terminal of the PNP BJT. VCBO max -40V, VCEO max -25V, IC max -1.5A. VCE(sat) max -0.5V at IC=-800mA, IB=-80mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `SS8550R1`

## CAD (KiCad official)

- Symbol: `SS8550`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ss8550-etched.step` / `ss8550-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ss8550.step` / `ss8550.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590905117371944960) (3 pp, sha256 `e0535b4723c7363e`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ss8550-datasheet.pdf)