# 2SD1899

**Changjing** · Bipolar (BJT) · TO-252-2L

2SD1899 from Changjing, in a TO-252-2L. 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 NPN transistor; emitter-base breakdown voltage V(BR)EBO is 7 V minimum and VEBO is rated at 7 V. |
| 2 | COLLECTOR | passive | Collector terminal of the NPN transistor, rated for VCBO 60 V, VCEO 60 V, IC 3 A and PC 1 W. |
| 3 | EMITTER | passive | Emitter terminal of the NPN transistor, with VEBO rated at 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2L |
| 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 | 60 |  |  | V | IC=100µA,IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 60 |  |  | V | IC=1mA,IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 7 |  |  | V | IE=100µA,IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 10 | μA | VCB=60V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 10 | μA | VEB=7V,IC=0 | 1 |
| DC current gain | hFE(1) | 60 |  |  |  | VCE=2V, IC=0.2A | 1 |
| DC current gain | hFE(2) | 100 |  | 400 |  | VCE=2V, IC=0.6A | 1 |
| DC current gain | hFE(3) | 50 |  |  |  | VCE=2V, IC=2A | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.25 | V | IC=1.5A,IB=0.15A | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.2 | V | IC=1.5A,IB=0.15A | 1 |
| Collector output capacitance | Cob |  | 30 |  | pF | VCB=10V,IE=0, f=1MHz | 1 |
| Transition frequency | fT |  | 120 |  | MHz | VCE=5V,IC=1.5A | 1 |
| Collector-base voltage | VCBO |  |  | 60 | V | Ta=25℃ unless otherwise noted | 1 |
| Collector-emitter voltage | VCEO |  |  | 60 | V | Ta=25℃ unless otherwise noted | 1 |
| Emitter-base voltage | VEBO |  |  | 7 | V | Ta=25℃ unless otherwise noted | 1 |
| Collector current | IC |  |  | 3 | A | Ta=25℃ unless otherwise noted | 1 |
| Collector power dissipation | PC |  |  | 1 | W | Ta=25℃ unless otherwise noted | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance from junction to ambient | RθJA |  |  | 125 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `2SD1899`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2L (KiCad packages3D, STEP)
- 3D model files: `2sd1899-etched.step` / `2sd1899-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sd1899.step` / `2sd1899.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/8586205004738793473) (4 pp, sha256 `9fb91e52d3df10f4`, 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/2sd1899-datasheet.pdf)