| Number of Channels | 4 (Quad-channel) |
| Isolation Voltage | 2,500 Vrms (min) |
| Input Type | LED (infrared) |
| Output Type | Phototransistor |
| Current Transfer Ratio (CTR) | 50% to 600% |
| Forward Voltage (V<sub>F</sub>) | 1.2V (typical) |
| Collector-Emitter Voltage (V<sub>CEO</sub>) | 80V |
| Input Current (I<sub>F</sub>) | 10 mA (max) |
| Output Collector Current (I<sub>C</sub>) | 50 mA (max) |
| Package Type | SOP-16 (Surface Mount) |
| Operating Temperature Range | -55°C to +110°C |
| Isolation Creepage Distance | 4 mm |
The TLP281-4GB is a quad-channel optocoupler (photocoupler) manufactured by Toshiba. This device is used to electrically isolate signals between different parts of a circuit while allowing the signal to pass through optically. It’s commonly used for signal isolation in applications such as microcontroller interfaces, power supplies, and industrial equipment.