The FOD2741 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. 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. When using the FOD2741, power supply designers can reduce the component count and save space in tightly packaged designs. The tight tolerance reference eliminates the need for adjustments in many applications. The device comes in a 8-pin dip white package.
The FOD2741A, FOD2741B and FOD2741C combine a precision shunt reference, an error amplifier and an optocoupler in an 8‑pin DIP package. They are intended for isolated AC‑to‑DC power supplies and DC‑DC converters, reducing component count and simplifying design.
Key features include a 2.5 V reference voltage, current‑transfer ratio of 100‑200 %, 5 kV RMS isolation, and a low temperature coefficient of 50 ppm/°C. The devices are supplied in DIP‑8 and tape‑and‑reel formats and meet UL, CSA, VDE and BSI approvals.
| Reference voltage | 2.5 V |
|---|---|
| Current Transfer Ratio (CTR) | 100 % – 200 % |
| Isolation rating | 5 000 V RMS |
| Operating temperature range | -25 °C to +85 °C |
| Storage temperature range | -55 °C to +125 °C |
The reference voltage is 2.5 V.
The CTR ranges from 100 % to 200 %.
It provides 5 000 V RMS isolation.