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Transistor photocouplers suit general-purpose apps

Posted: 07 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:general purpose photocoupler? transistor photocoupler?


Toshiba America Electronic Components Inc. has rolled the TLP781, a general-purpose photocoupler with transistor output that features high isolation voltage of up to 5,000Vrms (min.). The transistor photocoupler is targeted for a wide range of applications including home appliances, office equipment, solid state relays, switching power supplies, controllers and signal transmission systems.

Developed by Toshiba Corp., the TLP781 photocoupler and the TLP781F, a variation with wide lead spacing, meet reinforced insulation class UL, BSI, SEMKO and VDE international safety standard requirements.

The TLP781 is functionally equivalent to the existing Toshiba TLP421 photocoupler.

"These photocouplers are intended to assist customers working on designs that may be intended for global shipment and thus must meet the requirements for all major safety standards," said Jay Heinecke, business development director, discrete business unit, for TAEC.

The photocouplers consist of a silicone photo-transistor optically coupled to a gallium-arsenide infrared emitting diode in 4-pin DIP packages that measure only 6.5mm x 4.6mm x 3.5mm high. The TLP781 standard type features 7.62mm lead pitch, while the TLP781F wide lead version features 10.16mm pitch. The devices feature collector-emitter voltage of 80V (min.) with a current transfer ratio of 50 percent (min.). The operating temperature (Topr) is -55 to 110C (max.).

Samples of the TLP781 photocoupler and TLP781F photocoupler with wide lead spacing are available now, priced at 20 cents in sample quantities.

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