The TLP121 is a miniature flat‑pack optocoupler that integrates a gallium‑arsenide infrared emitting diode with a phototransistor. It is designed for surface‑mount assembly and is used in a wide range of electronic equipment such as computers, office devices, and industrial robotics.
The document lists maximum ratings, individual and coupled electrical characteristics, isolation performance, and switching behavior, together with handling precautions and restrictions on product use. Key parameters include collector‑emitter voltage, current transfer ratio, isolation voltage, and temperature limits.
| Collector‑Emitter Voltage (VCEO) | 80 V (Min) |
|---|---|
| Current Transfer Ratio (CTR) | 50 % (Min) |
| Isolation Voltage | 3750 Vrms (Min) |
| Forward Voltage (Vf) at 10 mA | 1.0 V (Typ) |
| Storage Temperature Range | -55 °C to 125 °C |
| Operating Temperature Range | -55 °C to 100 °C |
| Pulse Forward Current (Ipp) | 1 A (100 µs pulse, 100 pps) |
The device is rated for a minimum collector‑emitter voltage of 80 V.
It provides at least 3750 Vrms isolation voltage.
The recommended operating temperature range is –55 °C to 100 °C.
Typical forward voltage is about 1.0 V at 10 mA.