TLP521−1,TLP521−2,TLP521−4 are models of Toshiba photocouplers, consisting of a phototransistor optically coupled to a gallium arsenide infrared emitting diode. They have features such as 55 V collector-emitter voltage, 50% current transfer ratio, 2500 Vrms isolation voltage, etc.
The TLP521 series consists of GaAs infrared emitting diodes optically coupled to phototransistors. The TLP521-1 provides a single isolated channel, the TLP521-2 offers two channels in an 8‑lead DIP package, and the TLP521-4 provides four channels in a 16‑lead DIP package. All devices are rated for high isolation voltage and are intended for general electronics applications such as computers, measuring equipment, and industrial robotics.
Key electrical characteristics include a collector‑emitter voltage rating of 55 V, isolation voltage of 2500 Vrms (AC, 1 min), forward current up to 70 mA, and operating temperature range from –55 °C to 100 °C. The datasheet also provides switching times, current transfer ratios, and recommended operating conditions for reliable circuit design.
| Collector‑Emitter Voltage (VCEO) | 55 V (min) |
|---|---|
| Isolation Voltage (BVg) | 2500 Vrms (min, AC 1 min) |
| Forward Current (Ifp) Pulse | 1 A (100 % pulse, 100 pps) |
| Forward Voltage (VF) at 10 mA | Typical 1.15 V |
| Maximum Collector Current (IC) | 50 mA |
| Supply Voltage (VCC) | 5 V to 24 V |
| Storage Temperature Range | -55 °C to 125 °C |
The devices are rated for at least 2500 Vrms isolation voltage (AC, 1 minute).
The maximum collector current is 50 mA.
The recommended supply voltage range is 5 V to 24 V.
Typical forward voltage is about 1.15 V at a forward current of 10 mA.