Broadcom, HCPL-4100-000E DC Input Transistor Output Optocoupler, Through Hole, 8-Pin DIP

Data line transmission, with high noise immunity between electronic equipment, is achieved by using these 20mA current loop transmitter and receiver optocouplers for typical distances up to 9km.

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4mA-to-20mA Current-Loop Communication

Current loop systems are used in electrically noisy industrial environments for sending analogue sensor data over long distances of 300m or more.