# 2SA1661-Y

**Slkor SLKORMICRO Elec** · Bipolar (BJT) · SOT-89

2SA1661-Y from Slkor SLKORMICRO Elec, 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 | Base | passive | Base terminal of the PNP transistor; the datasheet gives VBE(sat) of -1.2 V max at IC=-500 mA, IB=-50 mA. |
| 2 | Collector | passive | Collector terminal; the absolute maximum ratings give VCBO and VCEO of -120 V and continuous collector current IC of -800 mA. |
| 3 | Emitter | passive | Emitter terminal; the absolute maximum rating for emitter-base voltage VEBO is -5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Slkor SLKORMICRO Elec |
| 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 Voltage | VCBO |  |  | -120 | V | Ta = 25℃ | 1 |
| Collector - Emitter Voltage | VCEO |  |  | -120 | V | Ta = 25℃ | 1 |
| Emitter - Base Voltage | VEBO |  |  | -5 | V | Ta = 25℃ | 1 |
| Collector Current - Continuous | IC |  |  | -800 | mA | Ta = 25℃ | 1 |
| Base Current | IB |  |  | -160 | mA | Ta = 25℃ | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW |  | 1 |
| Collector Power Dissipation | PC |  |  | 1 | W |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | VCBO | -120 |  |  | V | Ic= -1mA, IE=0 | 1 |
| Collector-emitter breakdown voltage | VCEO | -120 |  |  | V | Ic= -10 mA, IB=0 | 1 |
| Emitter-base breakdown voltage | VEBO | -5 |  |  | V | IE= -1mA, IC=0 | 1 |
| Collector-base cut-off current | ICBO |  |  | -100 | nA | VCB= -120 V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -100 | nA | VEB= -5V, IC=0 | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -1 | V | IC=-500 mA, IB=-50mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -1.2 | V | IC= -500 mA, IB=- 50mA | 1 |
| Base-emitter voltage | VBE |  |  | -1 | V | VCE= -5V, IC= -500mA | 1 |
| DC current gain (Y range) | hFE | 120 |  | 240 |  | VCE= -5V, IC= -100mA | 1 |
| Collector output capacitance | Cob |  |  | 30 | pF | VCB= -10V, IE= 0, f=1MHz | 1 |
| Transition frequency | fT | 120 |  |  | MHz | VCE= -5V, IC= -100mA | 1 |

## CAD (KiCad official)

- Symbol: `2SA1661-Y`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2sa1661-y-etched.step` / `2sa1661-y-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sa1661-y.step` / `2sa1661-y.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Slkor SLKORMICRO Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603061097419730944) (3 pp, sha256 `1632f715bb9b4970`, retrieved 2026-10-20, 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/2sa1661-y-datasheet.pdf)