Dual-channel isolation with 5000Vrms barrier
The onsemi HCPL2531SM is a dual-channel optocoupler in an 8-SMD gull-wing package, designed for galvanic isolation in logic-level and low-power signal paths. The 5000Vrms isolation rating covers reinforced insulation requirements per IEC 60950-1 for safety barriers between primary and secondary circuits. Each channel uses a DC-driven LED (1.45V typical forward voltage) coupled to a phototransistor output rated for 20V maximum and 8mA per channel. The current transfer ratio spans 19% to 50% at 16mA forward current, giving the designer a known gain window for logic-level translation across the isolation barrier.
Switching speed and temperature range for industrial control
Turn-on and turn-off times are 250ns and 260ns typical respectively, which suits PLC digital input modules, fieldbus interface isolation, and motor-drive feedback paths where propagation delay must stay below a microsecond. The 25mA absolute maximum forward current per channel sets the LED drive limit; staying below 16mA for nominal operation keeps the CTR within the specified 19%-50% band and avoids accelerated LED degradation over the product lifetime.