# KST9012

**KEXIN** · Bipolar (BJT) · SOT-23

KST9012 from KEXIN, 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 | Base | input | Base terminal of the PNP transistor; the datasheet gives VEBO of -5 V and VBE(sat) of -1.2 V at IC = -500 mA, IB = -50 mA. |
| 2 | Emitter | passive | Emitter terminal of the PNP transistor; the emitter-base breakdown voltage is -5 V minimum at IE = -100 uA, and the absolute maximum VEBO is -5 V. |
| 3 | Collector | passive | Collector terminal of the PNP transistor; absolute maximum ratings are VCBO -40 V, VCEO -25 V, continuous IC -500 mA, and collector power dissipation PC 300 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEXIN |
| Package | SOT-23 |
| 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 | VCBO | -40 |  |  | V | Ic= -100u A, I E=0 | 1 |
| Collector - emitter breakdown voltage | VCEO | -25 |  |  | V | IC= -1 mA , IB=0 | 1 |
| Emitter - base breakdown voltage | VEBO | -5 |  |  | V | IE= -100uA, I C=0 | 1 |
| Collector cut - off current | ICBO |  |  | -0.1 | A | VCB=- 40V, IE=0 | 1 |
| Emitter cut - off current | IEBO |  |  | -0.1 | A | VEB=- 5V, IC=0 | 1 |
| DC current gain | hFE | 120 |  | 400 |  | VCE=-1V, IC= -50mA | 1 |
| Collector - emitter saturation voltage | VCE(sat) |  |  | -0.6 | V | IC= -500 mA, IB= -50mA | 1 |
| Base - emitter voltage | VBE(sat) |  |  | -1.2 | V | IC= -500 mA, IB=- 50mA | 1 |
| Collector output capacitance | Cob |  | 5 |  | pF | VCB=-10V,IE=0,f=1MHz | 1 |
| Transition frequency | fT |  | 150 |  | MHz | VCE=-6V, IC=-20mA,f=30MHz | 1 |
| Collector - Base Voltage | VCBO |  |  | -40 | V | Ta = 25 | 1 |
| Collector - Emitter Voltage | VCEO |  |  | -25 | V | Ta = 25 | 1 |
| Emitter - Base Voltage | VEBO |  |  | -5 | V | Ta = 25 | 1 |
| Collector Current to Continuous | IC |  |  | -500 | mA | Ta = 25 | 1 |
| Collector Power Dissipation | PC |  |  | 300 | mW | Ta = 25 | 1 |
| Junction Temperature | Tj |  |  | 150 |  |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 |  |  | 1 |

## CAD (KiCad official)

- Symbol: `KST9012`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `kst9012-etched.step` / `kst9012-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kst9012.step` / `kst9012.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KEXIN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588904710875463680) (2 pp, sha256 `fe2fe1b155b01c26`, 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/kst9012-datasheet.pdf)