# BCX55-16-JSM

**JSMSEMI** · Bipolar (BJT) · SOT-89

BCX55-16-JSM from JSMSEMI, in a SOT-89. 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 | BASE | input | Base of the NPN transistor; the datasheet rates DC base current at 100 mA and peak base current at 200 mA, with emitter-base voltage limited to 5 V. |
| 2 | EMITTER | passive | Emitter of the NPN transistor; the datasheet gives emitter-base breakdown V(BR)EBO of 5 V minimum at IE=10 µA. |
| 3 | COLLECTOR | passive | Collector of the NPN transistor, connected to the center tab; the datasheet rates BCX55 VCEO at 60 V and VCBO at 60 V, with DC collector current of 1 A and peak collector current of 1.5 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SOT-89 |
| 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-emitter voltage (BCX55 column) | VCEO |  |  | 60 | V |  | 1 |
| Collector-base voltage (BCX55 column) | VCBO |  |  | 60 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | 5 | V |  | 1 |
| DC collector current | IC |  |  | 1 | A |  | 1 |
| Peak collector current | ICM |  |  | 1.5 | A |  | 1 |
| Base current | IB |  |  | 100 | mA |  | 1 |
| Peak base current | IBM |  |  | 200 | mA |  | 1 |
| Total power dissipation | Ptot |  |  | 500 | mW | TS=130℃ | 1 |
| Junction and storage temperature | Tj,Tstg | -65 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage (BCX55) | V(BR)CBO | 60 |  |  | V | IC=100μA IB=0 | 2 |
| Collector-emitter breakdown voltage (BCX55) | V(BR)CEO | 60 |  |  | V | IC=10mA IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=10μA IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | 100 | nA | VCB=30V IE=0 | 2 |
| Collector cut-off current at high temperature | ICBO |  |  | 20 | μA | VCB=30V IE=0, TA=150℃ | 2 |
| DC current gain | hFE | 25 |  |  |  | VCE=2V IC=5mA | 2 |
| DC current gain (-16 group) | hFE | 100 |  | 250 |  | VCE=2V IC=150mA | 2 |
| DC current gain (BCX54…56 row) | hFE | 40 |  | 250 |  | VCE=2V IC=150mA | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=500mA IB=50mA | 2 |
| Base-emitter voltage | VBE |  |  | 1 | V | IC=500mA, VCE=2V | 2 |

## CAD (KiCad official)

- Symbol: `BCX55-16-JSM`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `bcx55-16-jsm-etched.step` / `bcx55-16-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcx55-16-jsm.step` / `bcx55-16-jsm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](docs/bcx55-16-jsm-datasheet.pdf) (5 pp, sha256 `9172f3cc368eb650`, retrieved 2026-11-05, 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/bcx55-16-jsm-datasheet.pdf)