# 2SD1664U

**CBI** · Bipolar (BJT) · SOT-89

2SD1664U from CBI, 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 of the NPN transistor; VEBO max 5 V and IEBO max 0.5 µA at VEB = 4 V. |
| 2 | C | passive | Collector (also the tab on the SOT-89 package); VCBO 40 V, VCEO 32 V, IC 1 A DC and 2 A pulse. |
| 3 | E | passive | Emitter of the NPN transistor; ratings are 150 °C junction temperature and 0.5 W dissipation (2 W on a 40 x 40 x 0.7 mm ceramic board). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| 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 | V(BR)CBO | 40 |  |  | V | at IC = 50 µA | 1 |
| Collector Emitter Breakdown Voltage | V(BR)CEO | 32 |  |  | V | at IC = 1 mA | 1 |
| Emitter Base Breakdown Voltage | V(BR)EBO | 5 |  |  | V | at IE = 50 µA | 1 |
| DC Current Gain, Group P | hFE | 82 |  | 180 | - | at VCE = 3 V, IC = 100 mA | 1 |
| DC Current Gain, Group Q | hFE | 120 |  | 270 | - | at VCE = 3 V, IC = 100 mA | 1 |
| DC Current Gain, Group R | hFE | 180 |  | 390 | - | at VCE = 3 V, IC = 100 mA | 1 |
| Collector Cutoff Current | ICBO |  |  | 0.5 | µA | at VCB = 20 V | 1 |
| Emitter Cutoff Current | IEBO |  |  | 0.5 | µA | at VEB = 4 V | 1 |
| Collector Emitter Saturation Voltage | VCE(sat) |  |  | 0.4 | V | at IC = 500 mA, IB = 50 mA | 1 |
| Collector Base Voltage | VCBO |  |  | 40 | V |  | 1 |
| Collector Emitter Voltage | VCEO |  |  | 32 | V |  | 1 |
| Emitter Base Voltage | VEBO |  |  | 5 | V |  | 1 |
| Collector Current - DC | IC |  |  | 1 | A |  | 1 |
| Collector Current - Pulse | ICP |  |  | 2 | A | Single pulse, PW = 100 ms | 1 |
| Total Power Dissipation | Ptot |  |  | 0.5 | W |  | 1 |
| Total Power Dissipation | Ptot |  |  | 2 | W | When mounted on a 40 X 40 X 0.7 mm ceramic board | 1 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage Temperature Range | TStg | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `2SD1664U`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2sd1664u-etched.step` / `2sd1664u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sd1664u.step` / `2sd1664u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [CBI datasheet](docs/2sd1664u-datasheet.pdf) (3 pp, sha256 `81daf24124e00ac5`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/2sd1664u-datasheet.pdf)