STMicroelectronics STISO621 digital isolator

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STMicroelectronics has released the STISO621 dual-channel digital isolators, a series of high-performance ICs for industrial applications and general optocoupler replacement.

The product transfers data between two isolated domains at up to 100 Mbps, with pulse distortion below 3 ns, leveraging ST’s 6 kV thick-oxide galvanic-isolation technology. With two independent unidirectional channels, the device performs as a UART interface handling data in both directions. Schmitt-trigger inputs to each channel offer high noise immunity.

The supply voltages to the two mutually galvanically isolated sides of the isolator are independent of each other. Each has a wide voltage range, allowing level translation between 3.3 and 5.5 V circuitry. Typical common-mode transient immunity (CMTI) of 65 kV/µs protects the low-voltage side against high switching transients in harsh environments.

The product is suited to a wide range of industrial and consumer applications in power supplies, motor drives, meters, inverters, battery monitors, appliances, fieldbus isolators, size-critical multichannel isolation adapters and general isolation throughout industrial-automation systems. The design is tested in accordance with VDE0884-10 and UL 1577, the specifications typically applied to isolation devices for high-voltage applications.

The high-performance product has an operating temperature range from -40 to +125°C. With a maximum working isolation voltage (V_IOWM) of 1200 Vpeak, and high impulse-withstand voltage (V_IOTM), galvanic insulation integrity is maintained over time and during any system faults.

Two package variants are offered. In the SO8 narrow-body package with 4 mm creepage and clearance, the STISO621 has V_IOTM of 4800 V. The STISO621W in the SO8 wide-body package with 8 mm creepage and clearance has V_IOTM of 6000 V.

For more information: www.st.com/isolated-interfaces.