Vishay Intertechnology has introduced an automotive 1MBd high-speed optocoupler in a new SOP-5 package with a narrow width of 3.6mm. Combining a comparative tracking index (CTI) of 400 with minimum guaranteed common mode transient immunity (CMTI) of 40kV/µS, the Vishay VOMHA43A promises improved signal transmission quality and save space in applications requiring isolation voltages (VIORM) up to 707Vpeak.
While previous SOP-5 packages offered a width of 4.4mm, the narrower SOP-5 of the VOMHA43A requires less PCB space, while supporting stackable designs. The device’s minimum CMTI — which is more than double that of the closest competing device — provides enhanced robustness against electrical spikes and RF and EMI issues. And while competing devices offer maximum repetitive peak isolation voltages of 567Vpeak, the optocoupler’s isolation voltage performance of 707Vpeak meets the requirements of 400V battery systems.
The VOMHA43A consists of a GaAlAs infrared emitting diode, optically coupled with an integrated photodetector and a high speed transistor. The photodetector is junction-isolated from the transistor to reduce miller capacitance effects. The optocoupler features an open collector output function that allows designers to adjust load conditions when interfacing with different logic systems, while a Faraday shield on the detector chip allows the device to reject and minimize high input to output common mode transient voltages.
