5300 Vrms isolation in a 6-pin SMD package
The onsemi H11A13SD is a single-channel optocoupler in a 6-SMD Gull Wing package, combining a DC-input LED with a phototransistor output that includes a base terminal. The 5300 Vrms isolation rating qualifies it for reinforced insulation in mains-referenced circuits — a common requirement in industrial power supplies, motor-drive feedback, and PLC digital input modules where the low-voltage control side must be galvanically separated from the high-voltage field side.
CTR floor and switching speed for the signal path
With a minimum current transfer ratio of 50% at 10 mA forward current, the H11A13SD guarantees that the phototransistor collector current reaches at least 5 mA when the LED is driven at 10 mA — enough to saturate a downstream logic gate or pull a 5 V TTL input low through a 1 kΩ pull-up. The 2 µs typical turn-on and turn-off times place the switching ceiling around 250 kHz, adequate for 50/60 Hz line synchronization, relay-coil feedback, and low-speed serial isolation. The 400 mV maximum Vce(sat) at the rated collector current ensures the output saturates cleanly into a logic low without leaving the transistor in the linear region — important for noise margin in industrial environments where the receiving gate may have a 0.8 V Vil threshold.
onsemi lists the H11A13SD as obsolete. Buyers should verify the BOM position accepts the 6-SMD Gull Wing footprint and the 50% minimum CTR before committing a replacement.
Temperature grade and environment
Rated for -55°C to 100°C operating ambient, the H11A13SD covers the industrial temperature band with margin into the military low end. The 6-SMD Gull Wing package is suited for reflow soldering; the Tape & Reel delivery format supports automated pick-and-place assembly.