# KSC2690AYSTU

**onsemi** · Audio Amplifiers · TO-126-3

KSC2690AYSTU from onsemi, in a TO-126-3. 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 | Emitter | passive | Emitter terminal of the NPN transistor; the datasheet lists the emitter-base voltage rating as 5 V (VEBO). |
| 2 | Collector | passive | Collector terminal of the NPN transistor; the datasheet rates collector current at 1.2 A DC and 2.5 A pulsed, with collector-base and collector-emitter voltage of 120 V (KSC2690) or 160 V (KSC2690A). |
| 3 | Base | passive | Base terminal of the NPN transistor; the datasheet rates base current at 0.3 A DC. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-126-3 |
| Category | Amplifiers/Comparators |
| 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 (KSC2690A column) | VCBO |  |  | 160 | V |  | 2 |
| Collector-Emitter Voltage (KSC2690A column) | VCEO |  |  | 160 | V |  | 2 |
| Emitter-Base Voltage | VEBO |  |  | 5 | V |  | 2 |
| Collector Current (DC) | IC |  |  | 1.2 | A |  | 2 |
| Collector Current (Pulse) | ICP |  |  | 2.5 | A | PW≤10ms, Duty Cycle≤50% | 2 |
| Base Current (DC) | IB |  |  | 0.3 | A |  | 2 |
| Collector Dissipation | PC |  |  | 1.2 | W | Ta=25°C | 2 |
| Collector Dissipation | PC |  |  | 20 | W | TC=25°C | 2 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Collector Cut-off Current | ICBO |  |  | 1 | µA | VCB = 120V, IE = 0 | 2 |
| Emitter Cut-off Current | IEBO |  |  | 1 | µA | VEB = 3V, IC= 0 | 2 |
| DC Current Gain (hFE1) | hFE1 | 35 |  | 105 |  | VCE = 5V, IC = 5mA | 2 |
| DC Current Gain (hFE2) | hFE2 | 60 | 140 | 320 |  | VCE = 5V, IC = 0.3A | 2 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  | 0.4 | 0.7 | V | IC = 1A, IB = 0.2A | 2 |
| Base-Emitter Saturation Voltage | VBE(sat) |  | 1 | 1.3 | V | IC = 1A, IB = 0.2A | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC |  | IB Base Current(DC) 0.3 A PC Collector Dissipation (Ta=25°C) 1.2 W | 2 |

## CAD (KiCad official)

- Symbol: `KSC2690AYSTU`
- Footprint: `Package_TO_SOT_THT:TO-126-3_Vertical`
- 3D model: TO-126-3 (KiCad packages3D, STEP)
- 3D model files: `ksc2690aystu-etched.step` / `ksc2690aystu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ksc2690aystu.step` / `ksc2690aystu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588896650059898880) (7 pp, sha256 `cd613eddeffc8c9a`, 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/ksc2690aystu-datasheet.pdf)