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AN729

REPLACING TRADITIONAL OPTOCOUPLERS WITH Si87XX DIGITAL ISOLATORS

Silicon Laboratories 

AN729

This simple architecture provides numerous advantages over optocouplers:

Pin and Package Drop-In Opto-Coupler Upgrade

Faster propagation time, better parametric stability over voltage and temperature, 2x to 3x lower internal

parasitic coupling compared to optocouplers.

Standard CMOS Process Technology

CMOS is a well understood process technology with 40+ years of learning and offers 5.5 times lower

failures-in-time (FIT) rate than GaAs-based optocouplers, a time dependent dielectric breakdown (TDDB)

of 60 years, and a mean time-to-failure (MTTF) of 87 years. CMOS also provides an operating temperature

range of –40 to +125 °C compared to –40 to +85 °C for optocouplers, greater parametric stability over

voltage and temperature, and lower operating power versus optocouplers.

Precise Current Thresholds with Hysteresis

The Si826x output is either low or high, with no ambiguous output states and excellent threshold stability

over voltage and temperature. There are no current transfer ratio (CTR) issues to address.

Improved Performance

Shorter propagation delay time and PWD, wider operating temperature range, and greater parametric

operating stability than optocouplers.

Silicon Dioxide Based Capacitive Isolation Barrier

Silicon dioxide is an ultra-stable material enabling an unparalleled lifetime of over 60 years, compared to

less than 15 years in optocouplers.

Superior Surge Tolerance

Withstands 10 kV surge per IEC 60065

Wide Product Range

The Si87xx digital isolators are available in gull-wing PDIP8, SOIC8, LGA8, and SDIP6 packages and offer

optional internal pull-up resistor and external enable. (For more information, see the Si87xx Digital isolator

data sheet.)

2

Rev. 0.1

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