# KSA931

**Changjing** · Bipolar (BJT) · TO-92L

KSA931 from Changjing, in a TO-92L. 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 PNP transistor, with emitter-base voltage VEBO limited to -8 V. |
| 2 | COLLECTOR | passive | Collector terminal, rated for VCBO -80 V, VCEO -60 V, continuous collector current IC -0.7 A and collector power dissipation PC 1 W. |
| 3 | BASE | passive | Base terminal, driven at IB -50 mA for saturation at IC -500 mA (β=10), giving VCE(sat) of -0.7 V and VBE(sat) of -1.2 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-92L |
| 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 Voltage | VCBO |  |  | -80 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | -60 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | -8 | V |  | 1 |
| Collector Current -Continuous | IC |  |  | -0.7 | A |  | 1 |
| Collector Power Dissipation | PC |  |  | 1 | W |  | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | -80 |  |  | V | IC= -100μA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -60 |  |  | V | IC= -10mA , IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -8 |  |  | V | IE= -100μA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -0.1 | μA | VCB= -60 V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -0.1 | μA | VEB= -5V, IC=0 | 1 |
| DC current gain | hFE | 40 |  | 320 |  | VCE=-2 V, IC= -50mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.7 | V | IC= -500mA, IB= -50mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -1.2 | V | IC= -500mA, IB= -50mA | 1 |
| Transition frequency | fT |  | 100 |  | MHz | VCE= -10 V, IC= -50mA | 1 |
| Collector output capacitance | Cob |  | 13 |  | pF | VCB=-10V,IE=0,f=1MHz | 1 |

## CAD (KiCad official)

- Symbol: `KSA931`
- Footprint: `Package_TO_SOT_THT:TO-92`
- 3D model: TO-92L (KiCad packages3D, STEP)
- 3D model files: `ksa931-etched.step` / `ksa931-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ksa931.step` / `ksa931.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/ksa931-datasheet.pdf) (4 pp, sha256 `5ef9ca018b595206`, 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/ksa931-datasheet.pdf)