Optoelectronics

Photocouplers support signal transfer up to 100kb/s

28th January 2016
Nat Bowers

Designed for comms applications in factory automation equipment and home appliances, Toshiba Electronics Europe has announced the TLP2703 photocoupler. The device supports signal transfer speeds of up to 100kb/s, can be driven by a low input current of just 1mA and is price competitive with 1Mb/s class IC photocouplers.

This IC photocoupler features a minimum high current transfer ratio (IC/IF) of 900% at an input current of 0.5mA. Since the guaranteed maximum propagation delay is 25μs at an input current of IF=1.6mA and 7μs (maximum) at IF=12mA, this product is suitable for insulated communication interfaces such as RS-232C.

The widely used RS-232C communication interface and standard operates from several to 100kb/s. For this application, general purpose transistor couplers are not satisfactory in terms of performance while 1Mb/s class IC couplers are often too expensive. The TLP2703 is a suitable 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 maximum height of 2.3mm. Featuring a creepage distance of 8mm and an isolation voltage of 5kVrms, the TLP2703 is suitable for use in applications requiring high insulation performance. Its guaranteed operating temperature range is up to +125°C, which allows the implementation in compact industrial equipment that contains a greater density of components and therefore higher internal temperatures.

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