ACPL-K378 Voltage/Current Detector Optocouplers

Broadcom ACPL-K378 Isolated Voltage/Current Detector Optocouplers come with adjustable upper and lower thresholds. The devices utilize threshold-sensing input buffer ICs that permit control of threshold levels over a wide range of input voltages with a single external resistor. The input buffer incorporates several features, including switching immunity, hysteresis for enhanced noise immunity, and a diode bridge for easy use with internal clamping diodes and AC input signals. This feature protects the buffer and LED from a wide range of overvoltage and overcurrent transients. Variations in optical coupling from the LED to the detector do not affect the threshold levels because threshold sensing is done before driving the LED.