# TCLT1009

**Vishay Intertech** · Transistor, Photovoltaic Output Optoisolators · SOP-4-2.54mm

TCLT1009 from Vishay Intertech, in a SOP-4-2.54mm. 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 | A | passive | Anode of the gallium arsenide infrared-emitting diode, with forward current IF limited to 60 mA and reverse voltage VR limited to 6 V. |
| 2 | C | passive | Cathode of the infrared-emitting diode, which shares the 60 mA forward current and 6 V reverse voltage input limits. |
| 3 | E | passive | Emitter of the phototransistor output, with emitter-collector voltage VECO limited to 7 V. |
| 4 | C | passive | Collector of the phototransistor output, with collector-emitter voltage VCEO limited to 70 V and collector current IC limited to 50 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| Package | SOP-4-2.54mm |
| Category | Optoisolators |
| Pins | 4 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Current transfer ratio | CTR | 200 |  | 400 | % | VCE = 5 V, IF = 5 mA | 3 |
| Reverse voltage | VR |  |  | 6 | V |  | 2 |
| Forward current | IF |  |  | 60 | mA |  | 2 |
| Forward surge current | IFSM |  |  | 1.5 | A | tp ≤ 10 μs | 2 |
| Power dissipation (input) | Pdiss |  |  | 100 | mW |  | 2 |
| Junction temperature (input) | Tj |  |  | 125 | °C |  | 2 |
| Collector emitter voltage | VCEO |  |  | 70 | V |  | 2 |
| Emitter collector voltage | VECO |  |  | 7 | V |  | 2 |
| Collector current | IC |  |  | 50 | mA |  | 2 |
| Collector peak current | ICM |  |  | 100 | mA | tp/T = 0.5, tp ≤ 10 ms | 2 |
| Power dissipation (output) | Pdiss |  |  | 150 | mW |  | 2 |
| Junction temperature (output) | Tj |  |  | 125 | °C |  | 2 |
| Total power dissipation | Ptot |  |  | 250 | mW |  | 2 |
| Operating ambient temperature range | Tamb | -55 |  | 100 | °C |  | 2 |
| Storage temperature range | Tstg | -55 |  | 125 | °C |  | 2 |
| Soldering temperature | Tsld |  |  | 260 | °C |  | 2 |
| Forward voltage | VF |  | 1.25 | 1.6 | V | IF = 50 mA | 2 |
| Collector emitter voltage | VCEO | 70 |  |  | V | IC = 1 mA | 2 |
| Emitter collector voltage | VECO | 7 |  |  | V | IE = 100 μA | 2 |
| Collector emitter cut-off current | ICEO |  | 10 | 100 | nA | VCE = 20 V, IF = 0 A | 2 |
| Collector emitter saturation voltage | VCEsat |  |  | 0.3 | V | IF = 10 mA, IC = 1 mA | 2 |

## CAD (KiCad official)

- Symbol: `TCLT1009`
- Footprint: `Package_SO:SOP-4_3.8x4.1mm_P2.54mm`
- 3D model: SOP-4-2.54mm (KiCad packages3D, STEP)
- 3D model files: `tclt1009-etched.step` / `tclt1009-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tclt1009.step` / `tclt1009.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Vishay Intertech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586196024692527104) (9 pp, sha256 `b0514659b55eec98`, retrieved 2026-10-26, 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/tclt1009-datasheet.pdf)