ACPL-064L Digital CMOS Optocouplers Broadcom ACPL-064L digital CMOS optocoupler is an ultra low power, 10MBd device that combines an AIGaAs LED and an integrated high gain photodetector. The ACPL-064L features a forward LED current as low as 1.6mA, meaning most microprocessors can directly drive the LED. Broadcom digital CMOS optocoupler includes an internal Faraday shield that provides a guaranteed common mode transient immunity specification of 20kV/µs.