This data sheet lists the technical specifications of FOD2743A/B/C, including reference voltage accuracy, current transfer ratio, isolation voltage, temperature coefficient, etc.
The FOD2743 series is an optically isolated error amplifier that combines a precision KA431 reference, an optocoupler, and an error‑amplifier in a single 8‑pin DIP package. It is offered in three tolerance grades (0.5 %, 1 %, 2 %) and features a low temperature coefficient of 50 ppm/°C, making it suitable for isolated AC‑DC power supplies and DC‑DC converters.
Key specifications include a 2.5 V reference, current‑transfer ratio of 50 %–100 %, 5000 Vrms isolation, operating temperature from –25 °C to +85 °C, and a bandwidth of 50 kHz. The datasheet also provides pin definitions, absolute maximum ratings, and typical application circuits.
| Reference voltage | 2.5 V |
|---|---|
| Current‑transfer ratio (CTR) | 50 %–100 % |
| Isolation voltage | 5000 Vrms |
| Temperature coefficient | 50 ppm/°C |
| Package | 8‑pin DIP (white) |
| Input voltage rating | 37 V |
| Collector current rating | 50 mA |
| Bandwidth | 50 kHz |
The device provides a 2.5 V reference voltage.
It is rated for 5000 Vrms isolation.
FOD2743A has 0.5 % tolerance, FOD2743B 1 %, and FOD2743C 2 % tolerance.
The CTR ranges from 50 % to 100 %.