Photocoupler optimised for 100 kbps RS-232C

January 28, 2016 // By Graham Prophet
This device has been configured for use in industrial and home environments and claims cost and size advantages over existing 1Mbps Class IC photocouplers. Supporting signal transfer speeds of up to 100 kbps, the TLP2703 is price competitive with 1 Mbps class IC photocouplers and can be driven by an input current of 1 mA.

The IC features a high current transfer ratio (I C/IF) of 900% (min) at an input current of 0.5 mA. As the guaranteed propagation delay is 25 µsec (max) at an input current of I F=1.6 mA, and 7 µsec (max) at I F=12 mA, this product is suitable for insulated communication interfaces such as RS-232C.

RS-232C operates in the rate range between several kbps to 100 kbps. For this application general purpose transistor couplers are not satisfactory in terms of performance while 1 Mbps class IC couplers are often too expensive. The TLP2703 offers a solution, configured with a high output power infrared LED chip and a high speed photodarlington transistor.

The TLP2703 is housed in SO6L package with a max. height of 2.3 mm. With a creepage distance of 8 mm and an isolation voltage of 5 kVrms the TLP2703 is suitable for use in applications requiring high insulation performance. Its guaranteed operating temperature range is up to +125°C.

Toshiba Electronics Europe;