Vishay has introduced the VOMHA43A automotive-grade high-speed optocoupler, housed in a 3.6mm wide SOP-5 package and AEC-Q102 automotive-grade certified. This device offers at least 40kV/μs common-mode transient immunity (CMTI) and a maximum peak repetitive isolation voltage of 707V, suitable for CAN, LIN, I²C, and SPI communication bus isolation, smart power module drive isolation, and 400V battery system applications. Samples and mass production are currently available, with a lead time of six weeks.
The VOMHA43A's 3.6mm package width is narrower than the previous 4.4mm SOP-5 package, saving PCB space and supporting stacking designs. While reducing the package size, the device achieves a minimum CMTI of 40kV/μs, a figure Vishay claims is more than double that of the closest competitor currently available. CMTI is a key indicator of an optocoupler's immunity to electrical spikes and electromagnetic interference, particularly important in automotive high-voltage systems.
This device boasts a maximum repetitive peak isolation voltage of 707 Vpeak, exceeding the typical 567 Vpeak of competing products, meeting the isolation requirements of 400V battery systems. Currently, 400V battery platforms are the mainstream architecture for electric vehicles, and isolation between the high-voltage battery system and the low-voltage communication bus is a fundamental requirement for functional safety. The VOMHA43A consists of a GaAlAs infrared LED coupled to an integrated photodetector and a high-speed transistor. Junction isolation is used between the photodetector and the transistor to reduce the Miller capacitance effect. The device operates within a temperature range of -40°C to +125°C, is pin-compatible with mainstream competing products, and can be directly replaced.
From an application perspective, CAN and LIN buses are fundamental protocols for in-vehicle communication, I²C and SPI are widely used for inter-chip communication, and intelligent power module driver isolation involves IGBT/SiC drive circuits in motor controllers. The VOMHA43A extends Vishay's product reach from traditional passive components to automotive communication isolation, 400V battery systems, power module drives, and motor drives. In the field of automotive isolation devices, domestic companies such as Nanochip Microelectronics, Rongpai Semiconductor, and Chuantu Microelectronics are also advancing automotive-grade isolation products.
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