High-speed logic-gate optocouplers boost noise immunity to 20kV/µs

Three new optical isolators from Fairchild Semiconductor® utilise patented OPTOPLANAR® package technology, which reduces package capacitance by 30% to achieve over 20kV/µs Common-Mode Rejection (CMR) of noise for enhanced operation in industrial environments.

The FOD0721, FOD0720 and FOD0710 are logic-gate optocouplers that isolate the logic-control circuitry from the transceiver at the bus-interface level. Achieving double the rejection of common-mode noise compared to alternative optocouplers, they deliver a fast and robust isolation interface to ensure low transmission error rates and proven reliability for noisy industrial environments. By combining a CMOS LED driver, CMOS detection circuitry and a high-efficiency LED emitter, the FOD07xx series also achieves low power consumption.

The high noise immunity of these optocouplers combines with a fast data speed of 25Mbit/sec to protect against transmission errors and system failures. The FOD07xx series meets high-reliability requirements and devices are qualified according to the UL1577 safety standard for optical isolators. All devices are delivered in the 8-pin, small-outline, surface-mount SOP-8 package.

 

FEATURES 40ns propagation delay Low pulse-width distortion 5V-CMOS compatibility Temperature range: -40°C to 100°C

APPLICATIONS Programmable Logic Controllers (PLCs) Isolated data-acquisition systems PROFIBUS, DeviceNet™, CAN or RS485 networks

 

 

Fairchild Semiconductor / FOD0721, FOD0720 & FOD0710