High current photorelays offer advanced performance and extended temperature

Toshiba Electronics Europe has launched two new high current photorelays that are fabricated using the latest U-MOS IX semiconductor process. The new TLP3553A and TLP3555A devices provide OFF-state output terminal voltage ratings of 30V and 60V, and ON-state continuous current ratings of 4A and 3A. These are higher than earlier generation products. When run in pulsed mode, the current ratings rise to 9A for both devices. Common applications for these devices comprise industrial equipment, building automation systems, security equipment and the replacement of mechanical relays in legacy systems. The TLP3553A features a low ON-state resistance of just 50mOhm (max.) which is less than a typical mechanical relay (about 100mOhm). This ensures that operating losses are kept to a minimum when the device replaces mechanical relays such as 1-Form-A that are often used in industrial applications. The photorelays are rated for work at temperatures between -40C and +110C, making it easy to meet a thermal margin in designs. Both TLP3553A and TLP3555A are offered in a DIP4 package both with and without surface mount option.