STMicroelectronics — STISO621 Dual-Channel Digital Isolator
STMicroelectronics

STMicroelectronics STISO621 Dual-Channel Digital Isolator

Digital isolator offers reliable and high-performance alternative to an optocoupler

STMicroelectronics has begun volume production of the STISO621 dual-channel digital isolator IC, a high-performance replacement for optocouplers in industrial equipment.

 

The STISO621, which is based on new 6kV thick-oxide galvanic-isolation technology developed by ST, transfers data between two isolated domains at up to 100Mbits/s with pulse distortion of less than 3ns. Providing two independent unidirectional channels, the device performs as a UART data interface. 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 of 65kV/µs protects the low-voltage side from high switching transients in harsh environments.

 

The design of the STISO621 is tested in accordance with the VDE 0884-10 and UL 1577 standards, the specifications which are typically applied to isolation devices for high-voltage applications.

 

Two package variants are offered. In the SO8 narrow-body package with 4mm creepage and clearance, the STISO621 offers maximum impulse-withstand voltage of 4,800V. In the STISO621W, supplied in an SO8 wide-body package with 8mm creepage and clearance, the withstand-voltage rating is 6,000V.

 

ST provides a reference design based on the STISO621, the EVALSTPM-3PHISO, for three-phase isolated metering systems. This design combines the STISO621 to separate high-voltage domains with ST’s accurate STPMS2 metering front-end IC, together with firmware running on an STM32 microcontroller to compute three-phase metrology and power-quality data. ST also supplies a general-purpose evaluation board for the STISO621, the EVALSTISO62XV1.

Features

  • 1,200V peak isolation voltage
  • Low power consumption
  • Operating-temperature range: -40°C to 125°C

Applications

  • Power supplies
  • Motor drives
  • Meters
  • Inverters
  • Battery monitors
  • Industrial appliances
  • Fieldbus isolators

Evaluation Board

Board Part Number: EVALSTISO62XV1

The STISO621 evaluation board features a dual-channel digital isolator operating from a supply voltage up to 5V and offering 6kV of galvanic isolation.

Share This

Share on facebook
Share on twitter
Share on linkedin

Subscribe to our newsletters

Subscribe to Future Electronics

Get access to the latest product information, technical analysis, design notes and more

Choose your region

FTM Board Club

Sign up for access to exclusive development boards, an essential tool for many innovative design projects.

*Available to pre-qualified EMEA customers only.

Resources

Related Articles