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CMOS-Based Isolators

Silicon Cert LaboratoriesRequest Info
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Silicon Laboratories Inc. has introduced a drop-in replacement for optocouplers based on CMOS technology and incorporating an LED emulator input. The Si87xx digital isolators provide noise immunity, making them suitable for solar power inverters, switched mode power supplies, uninterruptible power supplies, industrial drives, programmable logic controllers and high-voltage medical equipment.

The optocoupler replacements use a patented CMOS-based isolation architecture that is immune to the output variations that plague LED-based optocouplers. CMOS-based capacitive isolation technology provides more than 10 times the mean-time-to-failure rate of optocouplers. By offering longer device lifetimes and higher reliability, the Si87xx isolators enable system manufacturers to support longer end product warranties.

Isolation ratings are up to 5 kV and fully compliant with IEC 60747-5-2, including 10-kV surge protection. The devices meet the requirements for IEC 60950-1, 61010-1, 60601-1 (reinforced insulation) and provide up to 1200-V working voltage with a >60-year lifetime.

They are immune to temperature, age and forward current effects. They offer a 50% lower input turn-on current and a 10 times lower output quiescent current than optocouplers. The low parasitic capacitance of the digital isolation architecture improves the common mode transient immunity by as much as 75% over optocouplers. The isolators outperform optocouplers in propagation delay and pulse-width distortion, enabling faster, more accurate data transfer.

The base Si8710 device consists of an LED emulator input and an open-collector output. Two additional device configurations are available: the Si8711 adds an integrated pull-up resistor, and the Si8712 includes a dedicated enable pin that can asynchronously control the output.

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Photonics Spectra
Jan 2013

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60601-161010-1AmericasBiophotonicsBreakthroughProductscapacitive isolationCMOS-based isolatorsdigital isolatorsElectronics & Signal Analysisenergygreen photonicshigh-voltage medical equipmentIEC 60747-5-2IEC 60950-1industrialindustrial drivesisolatorsLED emulator inputNew Productsopen-collector outputProductsprogrammable logic controllerspropagation delaypulse-width distortionreplace optocouplersSi87xxSilicon Laboratoriessolar power invertersswitched mode power suppliesTexasuninterruptible power supplies

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