The FOD2741 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. It comes in 3 grades of reference voltage tolerance = 2%, 1%, and 0.5%. The Current Transfer Ratio (CTR) ranges from 100% to 200%. It also has an outstanding temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/ reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc converters. The device features an optocoupler, precision reference, and error amplifier in a single package, a 2.5V reference, CTR 100% to 200%, 5,000V RMS isolation, and low temperature coefficient of 50 ppm/°C max.
The FOD2741 series combines a precision programmable shunt reference with an optocoupler in a single 8‑pin DIP package. It is intended for use as an error amplifier, reference voltage source, and optocoupler in isolated AC‑to‑DC power supplies and DC‑to‑DC converters.
Key features include a 2.5 V reference, current transfer ratio of 100 %–200 %, 5000 Vrms isolation, 50 kHz bandwidth, and a low temperature coefficient of 50 ppm/°C. The datasheet lists absolute maximum ratings, electrical characteristics, and typical performance curves to aid designers.
| Reference voltage | 2.5 V |
|---|---|
| Current Transfer Ratio (CTR) | 100 % to 200 % |
| Isolation voltage | 5000 Vrms |
| Bandwidth | 50 kHz |
| Temperature coefficient | 50 ppm/°C |
| Package | 8‑pin DIP white |
| Input voltage rating | 37 V |
| Collector‑emitter breakdown voltage | 70 V |
The device provides a current transfer ratio (CTR) ranging from 100 % to 200 %.
It is rated for 5000 Vrms isolation.
The reference voltage has a temperature coefficient of 50 ppm/°C.
The component is supplied in an 8‑pin DIP white package.