Optocoupler/LED/nixie tube/photoelectric device

The FOD2741 opto-isolated amplifier includes the popular KA431 precision programmable shunt voltage reference and optocoupler. The optocoupler is a gallium arsenide (GaAs) light-emitting diode optically coupled to a silicon phototransistor. It has 3 levels of reference voltage with tolerance = 2%, 1% and 0.5%. The range of current transfer ratio (CTR) is 100%-200%. It also has an outstanding temperature coefficient of 50 ppm/°C. It is primarily used as an error amplifier/reference voltage/optocoupler in isolated AC-to-DC power supplies and DC/DC converters. When using the FOD2741, power supply designers can reduce the number of components and save space in tight encapsulation designs. Tight tolerance references make adjustments unnecessary in many applications. The device features an 8-pin DIP white encapsulation.

The HCPL-0700, HCPL-0701, HCPL-0730, and HCPL-0731 optocouplers consist of an AlGaAs LED optically coupled to a high-gain split Darlington photodetector in a compact 8-pin small-outline encapsulation. The HCPL-0730 and HCPL-0731 devices have two channels per encapsulation for optimal packing density. This split Darlington configuration separates the input photodiode and first-stage gain from the output transistor, allowing for lower output saturation voltage and higher operating speed than conventional Darlington phototransistor optocouplers. The combination of very low input current of 0.5mA and high current transfer ratio of 2000% makes this series ideal for MOS, CMOS, LSTTL and EIA RS232C input interfaces while ensuring output compatibility to CMOS and high fanout TTL requirements.