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STMicroelectronics Unveils Dual Channel Digital Isolator

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

STThe STISO621 transfers data between two isolated domains at up to 100Mbit/s, with pulse distortion below 3ns, leveraging ST’s 6kV 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 ensure high noise immunity.

The supply voltages to the two mutually galvanically isolated sides of the STISO621 are independent of each other. Each has a wide voltage range, allowing level translation between 3.3V and 5.5V circuitry. Typical common-mode transient immunity (CMTI) of 65kV/µs protects the low-voltage side against high switching transients in harsh environments.

The STISO621 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 under VDE0884-10 and UL 1577, the specifications typically applied to isolation devices for high-voltage applications.

The EVALSTISO62XV1 product evaluation board is available to help accelerate design completion in multiple applications. The EVALSTPM-3PHISO reference design, specifically designed for three-phase isolated metering-systems use cases, is also available.

It combines the STISO621 to separate high voltage domains with ST’s high-accuracy STPMS2 metering front-end IC and specific firmware running on an STM32 microcontroller to compute three-phase metrology and power-quality data.

With a maximum working isolation voltage (VIOWM) of 1200Vpeak, and high impulse-withstand voltage (VIOTM), galvanic insulation integrity is maintained over time and during any system faults.

Two package variants are offered. In the SO8 narrow-body package with 4mm creepage and clearance, the STISO621 has a VIOTM of 4800V.

The STISO621W in the SO8 wide-body package with 8mm creepage and clearance have a VIOTM of 6000V. The high-performance level is guaranteed from -40°C to 125°C temperature range.


Aishwarya Saxena

A book geek, with creative mind, an electronics degree, and zealous for writing.Creativity is the one thing in her opinion which drove her to enter into editing field. Allured towards south Indian cuisine and culture, love to discover new cultures and their customs. Relishes in discovering new music genres.

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