# 2SA1585

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

2SA1585 from Changjing, 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, with emitter-base breakdown of -6 V (min/typ/max as -6 V) and a base-emitter reverse test at VEB = -5 V for emitter cut-off current. |
| 2 | EMITTER | passive | Emitter terminal of the PNP transistor, rated with a maximum emitter-base voltage VEBO of -6 V and emitter cut-off current IEBO of -0.1 µA at VEB = -5 V. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor, rated for a collector-base voltage VCBO of -20 V, a collector-emitter voltage VCEO of -20 V and a continuous collector current of -2 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 | V(BR)CBO | -20 |  |  | V | IC= -50µA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -20 |  |  | V | IC= -1 mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -6 |  |  | V | IE=- 50µA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -0.1 | µA | VCB=-20V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -0.1 | µA | VEB= -5V, IC=0 | 1 |
| DC current gain | hFE | 120 |  | 390 |  | VCE=-2 V, IC= -0.1A | 1 |
| Collector-emitter saturation voltage | VCEsat |  |  | -0.5 | V | IC= -2A, IB=-0.1A | 1 |
| Transition frequency | fT | 240 |  |  | MHz | VCE=-2V, IC=-0.5A, f=100MHz | 1 |
| Collector-base voltage | VCBO |  |  | -20 | V |  | 1 |
| Collector-emitter voltage | VCEO |  |  | -20 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | -6 | V |  | 1 |
| Collector current, continuous | IC |  |  | -2 | A |  | 1 |
| Collector power dissipation | PC |  |  | 350 | mW |  | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature range | Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `2SA1585`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `2sa1585-etched.step` / `2sa1585-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sa1585.step` / `2sa1585.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586178653948821504) (4 pp, sha256 `499a304fa5bfe6bb`, 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/2sa1585-datasheet.pdf)