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Avago Technologies has introduced a miniature optocoupler isolation amplifier with low temperature drift and reinforced insulation for current and voltage sensing applications such as industrial inverters.
The ACPL-C78x devices are packaged in a stretched-SO8 package with 8mm creepage and clearance and are suitable for reinforced insulation up to 1140V(peak) according to the optocoupler safety norm IEC/EN 60747-5-2 and 5000V per UL1577.
The package is 30% smaller than existing DIP8 packages, said the supplier.
In typical applications, the ACPL-C78x optocoupler measures the voltage across a shunt resistor and then transmits the signal digitally across the isolation barrier. The signal is then converted back into a differential analog output signal.
Using a double insulation construction consisting of silicone and a homogenous polyamide tape (greater than 80µm thick), optical isolators are capable of achieving a long high voltage life time. They are suitable for providing safe insulation in the end products where they are used.
The parts are available in three different options, sorted for absolute gain tolerance at 25°C which can be useful in non-calibrated applications.
The common mode noise rejection capability of these new isolation amplifiers is 15kV/µs at 1000VCM.
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