MCT5210 (Siemens Group) - AlGaAs LED/ Phototransistor Optocoupler MCT5210 MCT5211 AlGaAs LED/ Phototransistor Optocoupler FEATURES • Current Transfer Ratio MCT5210, >70% at IF=3.0 mA MCT5211, >110% at IF=1.0 mA • Sat (14 views)