The IL211AT comes in an 8-SOIC package (3.90 mm body width) — a standard footprint for optocouplers in this isolation class. The surface-mount body sits low enough that the 4 kVrms creepage distance is maintained by the package moulding, not an external slot. Rated for -55 °C to 100 °C operating ambient, the part covers industrial temperature bands — motor-drive control feedback and PLC digital inputs both stay within the envelope.
Switching speed and transfer ratio
Turn-on and turn-off times are both 3 µs typical — this sets the maximum data rate at roughly 160 kHz in a saturated-switch configuration. For a 24 VDC PLC input with a 10 mA LED drive, the 20% minimum CTR at 10 mA guarantees the output transistor pulls the collector voltage below the logic threshold within that window. The transistor-with-base output lets you tailor the switching threshold with an external base resistor — useful when the input current varies across the 60 mA absolute maximum forward current.