Features

■ AC or DC input

■ Programmable sense voltage

■ Logic level compatibility

■ Threshold guaranteed over temperature (0°C to 70°C)

■ Optoplanar™ construction for high common mode immunity

■ UL recognized (file # E90700)

■ VDE certified – ordering option ‘V’, e.g., HCPL3700V

Applications

■ Low voltage detection

■ 5 V to 240 V AC/DC voltage sensing

■ Relay contact monitor

■ Current sensing

■ Microprocessor Interface

■ Industrial controls

Description

The HCPL-3700 voltage/current threshold detection optocoupler consists of an AlGaAs LED connected to a threshold sensing input buffer IC which are optically coupled to a high gain darlington output. The input buffer chip is capable of controlling threshold levels over a wide range of input voltages with a single resistor. The output is TTL and CMOS compatible.