# SS8050D331

**ALJ** · Bipolar (BJT) · TO-92

SS8050D331 from ALJ, in a TO-92. 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 | Emitter | passive | Emitter terminal of the NPN transistor, with emitter-base breakdown voltage V(BR)EBO of 5 V minimum and VEBO rated at 5 V. |
| 2 | Base | input | Base terminal; base-emitter saturation voltage VBE(sat) is 1.2 V at IC = 800mA with IB = 80mA. |
| 3 | Collector | passive | Collector terminal; maximum ratings are VCBO 40 V, VCEO 25 V and collector current IC 1.5 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ALJ |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | V(BR)CBO | 40 |  |  | V | IC = 100µA, IE = 0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 25 |  |  | V | IC = 1mA, IB = 0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE = 100µA, IC = 0 | 1 |
| Collector cut-off current | ICBO |  |  | 100 | nA | VCB = 40V, IE = 0 | 1 |
| Emitter cut-off current | IEBO |  |  | 100 | nA | VEB = 5V, IC = 0 | 1 |
| DC current gain hFE(1) | hFE(1) | 100 |  | 400 |  | VCE = 1V, IC = 100mA | 1 |
| DC current gain hFE(2) | hFE(2) | 40 |  |  |  | VCE = 1V, IC = 800mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC = 800mA, IB = 80mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.2 | V | IC = 800mA, IB = 80mA | 1 |
| Base-emitter voltage | VBE |  | 1 |  | V | VCE = 1V, IC = 10mA | 1 |
| Transition frequency | fT | 100 |  |  | MHz | VCE = 10V, IC = 50mA, f = 30MHz | 1 |
| Collector-base voltage | VCBO |  |  | 40 | V |  | 1 |
| Collector-emitter voltage | VCEO |  |  | 25 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | 5 | V |  | 1 |
| Collector current | IC |  |  | 1.5 | A |  | 1 |
| Junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 1 |
| Collector power dissipation | PCM |  |  | 1 | W | TA = 25°C | 1 |
| Collector power dissipation | PCM |  |  | 2 | W | TC = 25°C | 1 |
| Collector power dissipation | PC |  |  | 625 | mW |  | 1 |
| Thermal resistance from junction to ambient |  |  |  | 200 | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `SS8050D331`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `ss8050d331-etched.step` / `ss8050d331-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ss8050d331.step` / `ss8050d331.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ALJ datasheet](docs/ss8050d331-datasheet.pdf) (3 pp, sha256 `26bedf810d57cfcb`, retrieved 2026-11-05, 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/ss8050d331-datasheet.pdf)