# 2SD1664

**hongjiacheng** · Bipolar (BJT) · SOT-89

2SD1664 from hongjiacheng, 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 | B | input | Base terminal of the NPN transistor; the datasheet gives an emitter-base voltage rating VEBO of 5.0 V and an emitter-base cut-off current IEBO of 0.5 µA max at VEB = 4.0 V. |
| 2 | C | passive | Collector terminal; the datasheet limits are collector-base voltage VCBO 40 V, collector current IC 1.0 A, and collector power dissipation PC 0.5 W. |
| 3 | E | passive | Emitter terminal; the collector-emitter breakdown voltage V(BR)CEO is 32 V minimum at IC = 1.0 mA, IB = 0. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | SOT-89 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `2SD1664`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2sd1664-etched.step` / `2sd1664-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sd1664.step` / `2sd1664.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604436428105801728) (3 pp, sha256 `4dfb0580ac25a1f0`, retrieved 2026-10-09, 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/2sd1664-datasheet.pdf)