# 2SD1664G-Q-AB3-R

**UTC Unisonic Tech** · Bipolar (BJT) · SOT-89

2SD1664G-Q-AB3-R from UTC Unisonic Tech, 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 | passive | Base terminal of the NPN transistor, pin 1 of the SOT-89 package per the ordering-information pin assignment table. |
| 2 | C | passive | Collector terminal of the NPN transistor; DC collector current is rated 1 A and pulsed collector current 2 A (duty 1/2, PW 20 ms). |
| 3 | E | passive | Emitter terminal of the NPN transistor; emitter-base voltage is rated 5 V (VEBO). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-89 |
| 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 | BVCBO | 40 |  |  | V | IC= 50μA | 3 |
| Collector-Emitter Breakdown Voltage | BVCEO | 32 |  |  | V | IC= 1mA | 3 |
| Emitter-Base Breakdown Voltage | BVEBO | 5 |  |  | V | IE=50μA | 3 |
| Collector Cut-Off Current | ICBO |  |  | 0.5 | μA | VCB=20V | 3 |
| Emitter Cut-Off Current | IEBO |  |  | 0.5 | μA | VEB= 4V | 3 |
| DC Current Gain (rank Q, 120-270) | hFE | 120 |  | 270 |  | VCE= 3V, Ic= 100mA | 3 |
| Collector-Emitter Saturation Voltage | VCE(SAT) |  | 0.15 | 0.4 | V | IC/IB=500mA /50mA | 3 |
| Transition Frequency | fT | 150 |  |  | MHz | VCE=5V, IE=-50mA, f=100MHz | 3 |
| Output Capacitance | Cob |  |  | 15 | pF | VCB= 10V, IE= 0A, f=1MHz | 3 |
| Collector-Base Voltage | VCBO |  |  | 40 | V |  | 3 |
| Collector-Emitter Voltage | VCEO |  |  | 32 | V |  | 3 |
| Emitter-Base Voltage | VEBO |  |  | 5 | V |  | 3 |
| Collector Current DC |  |  |  | 1 | A |  | 3 |
| Collector Current Pulse | IC |  |  | 2 | A | Duty=1/2, PW=20ms | 3 |
| Collector Power Dissipation (SOT-89) | PC |  |  | 0.5 | W | SOT-89 package | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `2SD1664G-Q-AB3-R`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2sd1664g-q-ab3-r-etched.step` / `2sd1664g-q-ab3-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sd1664g-q-ab3-r.step` / `2sd1664g-q-ab3-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603112321061298176) (5 pp, sha256 `e80e0db566df10d8`, 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/2sd1664g-q-ab3-r-datasheet.pdf)