Photocouplers support signal transfer up to 100kb/s

Posted By : Nat Bowers
Photocouplers support signal transfer up to 100kb/s

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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