SEM1020 is a low cost isolator that requires power on both sides of the isolation barrier. In certain applications there can be a number of devices in a loop, each requiring some volts from the loop. Often there is a requirement for more volts than the loop can supply. By using the SEM1020 low cost isolator an additional load up to 900 ohm can be driven from a single 24V supply.

SEM1020 Data Sheet

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SEM1020 4 to 20mA Loop Booster