5300 Vrms isolation in a 4-DIP through-hole package
This mid-range bin is the most commonly specified for general-purpose logic-level isolation and relay drive, where the LED current budget and output saturation margin are balanced. The 400 mV maximum Vce saturation at the rated output current keeps the output drop low enough to drive a 5 V logic input directly.
Switching speed and temperature range
That places it in the slow-to-moderate speed class — fine for 50/60 Hz mains zero-cross detection, relay coil drive, and status feedback, but not for high-speed data or gate-drive isolation.