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Digital isolators provide high channel count

Posted: 05 Aug 2011 ?? ?Print Version ?Bookmark and Share

Keywords:digital isolators? octocouplers? insulation protection?

Silicon Laboratories Inc. has release digital isolators that offers high channel count, performance and data rate for applications with isolation ratings up to 5kV. The Si86xx 3.75kV and 5kV 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 5kV rating, the Si86xx family offers an isolation solution for systems powered from 220Vac 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).


The Si86xx isolators deliver 150Mbit/s across a wide temperature range of -40∼C每125∼C.

Based on Silicon Labs' digital isolation technology, the Si86xx family includes six-channel isolators rated to 5kV, bidirectional isolators suitable for isolating I2C buses in a wide range of applications, and 3.75kV options that provide higher levels of protection than currently available from 2.5kV isolators. These higher isolation ratings translate into longer service lifetime in harsh application conditions. The Si86xx family's 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 20dB lower electromagnetic emissions than competing solutions. By offering high electric field immunity, the Si86xx digital isolators are suitable 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.

The Si86xx isolators deliver fast data rate (150Mbit/s) across wide temperature range (-40∼C每125∼C), as well as ultra-low power operation of less than 1.6mA per channel at 1Mbit/s for energy-efficient system design. The 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.

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 5kV and narrow-body SOIC-8 and SOIC-16 packages rated at 3.75kV. Pricing in 10,000-unit quantities for 5kV Si86xx devices ranges from $1.06 for a single-channel, 3.75kV rated device up to $3.76 for six-channel versions rated to 5kV isolation in SOIC-16 packages.

Silicon Labs offers the Si86xxISO-KIT evaluation kit, priced at $49.00, to support basic functional testing and engineering validation of 5kV isolation product configurations. The Si86ISOLIN-KIT linear isolation reference design, priced at $149, provides a comprehensive, high-performance alternative to costly isolation amplifiers used to implement analog signal isolation. The reference design includes three different analog isolation circuits supporting input signal bandwidths from 100每500kHz.

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