Quad optocouplers shrink databus interfaces

NEC has developed a range of ultra-small optocouplers with four on-chip circuits, ideal for implementing isolated digital databus interfaces and handling multiple I/O signals from sequencers and PLCs.

NEC has developed a range of ultra-small optocouplers with four on-chip circuits, ideal for implementing isolated digital databus interfaces and handling multiple I/O signals from sequencers and programmable logic controllers.

The new quad optocoupler was developed using NEC's state-of-the-art package miniaturisation technology to integrate four circuits (channels) into an ultra-small 0.8mm lead pin pitch package (down from the conventional 1.27mm), which translates into a device that requires half the mounting sise of the smallest current products available.

NEC will release three versions of the optocoupler that enable electrical isolation of I/O signals by optically coupling the light emitting and receiving elements.

Version one will support AC signals and features two light emitting elements on the input side and a common collector lead on the output side.

The other two versions support DC input signals and feature a single light emitting element with either a common anode or cathode lead and a common collector lead on the output side.

Reduction of input current from 5 to 1mA allows considerable energy savings.

Optimisation of the light receiving element enables generation of output currents of 1 to 4mA at a low input.

The new device features a high isolation voltage of 1500V, in accordance with international safety standards.

It can be mounted by infra-red reflow (peak temperature: 235C) and the possible use of lead plating that supports lead-free solder and a peak temperature of 260C is currently being examined for future developments.

Volume production is scheduled for March 2002 at 800 thousand units per month.

Samples can be ordered at a price of Eur 2 per unit.

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