5300 Vrms isolation in a 6-DIP through-hole package
The onsemi H11A4W is a single-channel phototransistor optoisolator with a guaranteed 5300 Vrms isolation rating, packaged in the industry-standard 6-DIP (0.400", 10.16 mm) through-hole format. The DC input drives an infrared LED; the output is a phototransistor with the base brought out, giving the designer the option to add a base resistor for speed adjustment or leave it open for standard transistor operation.
CTR floor and switching speed for the BOM
Minimum current transfer ratio is 10 % at a forward current of 10 mA — this is the floor the designer budgets for to guarantee the output transistor saturates at the load current. The typical turn-on and turn-off times are both 2 µs, which suits logic-level signal isolation up to a few hundred kilohertz; for higher-speed interfaces a logic-output optocoupler would be a better fit. Maximum Vce saturation is 400 mV, so the output drops less than half a volt when fully on at the rated collector current. The output transistor is rated for 30 V maximum, and the forward voltage of the LED is 1.18 V typical, which is standard for an infrared GaAs emitter. Operating temperature spans -55 °C to 100 °C, covering industrial and most automotive under-hood environments. The maximum continuous forward current through the LED is 100 mA, and the package is supplied in tubes.
onsemi has marked the H11A4W as obsolete.