Vishay’s VOMHA43A automotive optocoupler cuts SOP-5 package width to 3.6 mm

Vishay Intertechnology has narrowed the body of its SOP-5 optocoupler package from 4.4 mm to 3.6 mm.

The VOMHA43A is an automotive 1 MBd optocoupler that’s rated for a maximum repetitive peak isolation voltage (VIORM) of 707 Vpeak, which meets the requirements of 400 V battery systems. Competing devices reach 567 Vpeak, according to the company. Minimum guaranteed common mode transient immunity (CMTI) is 40 kV/µs, which Vishay says is more than double the figure of the closest competing part, and the comparative tracking index (CTI) is 400. The company says the device is AEC-Q102 qualified, RoHS-compliant and halogen-free, and it operates from -40° C to +125° C.

CMTI is a measure of how steep a common mode voltage step an isolator can withstand before its output flips state. In an inverter driving a traction motor, switching devices can drive the two sides of an isolation barrier hundreds of volts apart in tens of nanoseconds, and a coupler that can’t ride that out will report a false edge on the data line. CTI rates how well an insulating material resists surface tracking, and a higher index allows shorter creepage distances at a given working voltage.

The VOMHA43A consists of a GaAlAs infrared emitting diode optically coupled to an integrated photodetector and a transistor. The photodetector is junction-isolated from the transistor, and the device has an open collector output. Vishay says a Faraday shield on the detector chip lets the device reject and minimize high input to output common mode transient voltages.

The part is designed for isolated data communication, fast signal switching, ground signal isolation and logic voltage level shifting. In EVs, hybrid EVs and low speed EVs, Vishay says it provides communication bus isolation for CAN, LIN, I²C and SPI interfaces, along with isolated drive circuits such as intelligent power module (IPM) drivers. The company also lists industrial, home and building control and telecom uses.

Vishay says the VOMHA43A is pin-to-pin compatible with competing parts and can be used as a direct replacement without electrical or mechanical redesign. Samples and production quantities are available, and lead times are six weeks.

Source: Vishay Intertechnology