Industry’s first six-channel 5 kV digital isolators

08 August 2011

Isolators offer superior EMI and noise performance and highest data rate
Isolators offer superior EMI and noise performance and highest data rate

Isolators offer superior EMI and noise performance and highest data rate.

Silicon Laboratories has released a family of digital isolators that offers the highest channel count, performance and data rate for demanding applications with isolation ratings up to 5 kV.

The new Si86xx 3.75 kV and 5 kV digital isolators replace optocouplers in target applications requiring robust operation and high levels of insulation protection such as industrial automation and drives, motor control and medical systems.

With its 5 kV rating, the Si86xx family offers a solution for systems powered from 220 V AC mains supplies such as isolated AC-DC and DC-DC power supplies, as well as solar panel microinverters, data communications systems and hybrid electric vehicles (HEVs).

Based on Silicon Labs’ patented digital isolation technology, the new Si86xx family includes the industry’s first six-channel isolators rated to 5 kV, bidirectional isolators suitable for isolating I2C buses in a wide range of applications, and 3.75 kV options that provide higher levels of protection than currently available from 2.5 kV isolators.

These higher isolation ratings translate into a longer service lifetime in harsh application conditions. The Si86xx family’s unmatched isolation channel count also helps simplify timing and isolation challenges in high-speed systems with wide digital buses by enabling developers to minimise the number of separate isolators, thereby reducing BOM costs and board space.

The Si86xx family offers significant electromagnetic emissions and immunity performance advantages, providing error-free data in noisy environments and up to 20 dB lower electromagnetic emissions than competing solutions.

By offering the highest electric field immunity, the Si86xx digital isolators are well suited for use in noisy environments common in motor control, industrial automation and power supply applications as well as green energy applications such as smart meters where tamper protection is a growing concern.

Isolators offer superior EMI and noise performance and highest data rate
Isolators offer superior EMI and noise performance and highest data rate

The Si86xx isolators deliver the industry’s fastest data rate (150 Mbps) across the widest temperature range (-40 to 125ºC), as well as ultra-low power operation of less than 1.6 mA per channel at 1 Mbps for energy-efficient system design.

The robust architecture of the Si86xx family ensures that signal integrity is maintained even while operating at high data rates and at high temperatures in harsh environments.

“The new Si86xx family brings the superior EMI performance, high data rates and reliability of Silicon Labs’ digital isolator technology to demanding applications requiring isolation ratings up to 5 kV and system cost reduction based on higher channel count density,” said Mark Thompson, Vice President of Embedded Mixed-Signal products at Silicon Labs. “The Si86xx isolators enable developers to upgrade their optocoupler-based designs with a more reliable, highly integrated and higher-performance digital isolation solution.”

Samples and production quantities of the Si86xx digital isolators are available now in a variety of compact packages including wide-body SOIC-16 packages rated at 5 kV and narrow-body SOIC-8 and SOIC-16 packages rated at 3.75 kV.

Silicon Labs also offers the Si86xxISO-KIT evaluation kit to support basic functional testing and engineering validation of 5 kV isolation product configurations. The Si86ISOLIN-KIT linear isolation reference design provides a comprehensive, high-performance alternative to costly isolation amplifiers used to implement analogue signal isolation.

The reference design includes three different analogue isolation circuits supporting input signal bandwidths from 100 to 500 kHz.

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