Range of speedy photocouplers can handle high voltage spikes

14 June 2006 Opto-Electronics

Sharp Microelectronics has expanded its family of optocouplers by adding some components for specific models with transfer rates of 1 Mbps, 10 Mbps or 25 Mbps. Whereas all high-speed optocouplers function within an ambient temperature range of -40 to +85°C, the 1 Mbps high-speed optocoupler goes beyond this - it is designed to work in an expanded temperature range of -55 to 100°C.

Depending on the type of optocoupler, the components provide voltage isolation of 3,75 kV or 5,0 kV. This high degree of electric breakdown strength, good temperature and moisture stability are made possible by the 'Double-Transfer Mould Technology'. In a two-stage moulding process, the photo-elements are first coated with a transparent resin and then covered with a non-transparent resin, which are high-temperature-resistant epoxy resins. This technology enables the components to withstand peak temperatures of 260°C during reflow and dip soldering.

The high switching speed (25 Mbps) of the optoelectronic components is achieved by using high-speed LEDs (GaAIAs) with Sharp driver CMOS ICs and the OPIC method. This technology, which was also developed by Sharp, integrates the photodiode and the IC signal processor on one chip.

Sharp's high-speed optocouplers can be used in a large number of premium applications. In the factory automation sector, these include fieldbus applications, such as: DeviceNet, Profibus and Interbus. In the area of computer networking, the high-speed products are used in interfaces such as RS422 or RS485.

Depending on the design, Sharp offers these RoHS-compliant high-speed optocouplers in both SOP 8 and DIP 8 housings.

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