ECG1104

ECG1104: AC Input Phototransistor Output Optocoupler featuring two gallium arsenide infrared emitting diodes connected in an inverse-parallel configuration optically coupled to an NPN phototransistor inside a 6-pin dual-in-line package. It functions by allowing bidirectional alternating currents (AC) or symmetric digital pulses to bridge a high 5000 \(\text{V}_{\text{RMS}}\) galvanic isolation gap, universally deployed to safely track telephone ring signals and monitor AC power line conditions. (Industry Exact Equals: Philips ECG1104, NTE1104, Vishay H11AA4, onsemi H11AA4M, Lite-On H11AA4, Everlight H11AA4).