Si87xx Optocoupler Replacement Isolators

The Si87xx isolators are pin-compatible, single-channel, drop-in optocoupler replacements with data rates up to 15 Mbps. These devices isolate high-speed digital signals and offer performance, reliability, and flexibility advantages not available with optocoupler solutions. The Si87xx series is based on Silicon Labs' proprietary CMOS isolation technology for low-power and high-speed operation and are resistant to the wear-out effects found in optocouplers that degrade performance with increasing temperature, forward current, and device age. As a result, the Si87xx series offer longer service life and dramatically higher reliability compared to a traditional optocoupler. Ordering options include open collector or push-pull outputs with and without integrated pull-up resistor and output enable pin.
 
 

Features

  • Pin-compatible, drop-in upgrades for popular high-speed digital optocouplers
  • Performance and reliability advantages vs. optocouplers
    • Resistant to temperature, age and forward current effects
    • 10x lower FIT rate for longer service life
    • Higher common-mode transient immunity:
      >50 kV/μs typical
    • Lower power and forward input diode current
  • PCB footprint compatible with optocoupler packaging
  • Wide range of product options
  • Diode emulator input
  • 3 to 30 V open collector output
  • Propagation delay 30 ns typical
  • Data rates from dc to 15 Mbps
  • 3.75 and 5 kV reinforced isolation
  • UL, CSA, VDE certifications
  • Wide operating temperature range –40 to +125 °C
  • RoHS-compliant packages
 
 

Applications

Documentation

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Data Sheet (2)

User Guides (3)

Application Notes (5)

White Papers (9)

PCN (2)

DescriptionVersionUpdatedSize
1304221 Si8310 EOL notice
93 kB
1305141 EOL IA2116-330-FW
92 kB
Product Matrix
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Part NumberMaximum Propagation DelayIsolation Rating10kV surgeEnable ControlPackage TypeOutput SupplyInput SupplyTemperature RangeVDDBidirectional ChannelsEval KitUnidirectional ChannelsChannel TypeForward ChannelsReverse ChannelsMax Data RateDefault Output StateIntegrated Pull-UpAEC-Q100Input TypeOutput Type
Si8710AC-B-IP603.75YesNoGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8710AC-B-IS603.75YesNoNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8710AD-B-IS605.0YesNoWB SOIC63.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8710BC-B-IP603.75YesNoGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8710BC-B-IS603.75YesNoNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8710BD-B-IS605.0YesNoWB SOIC63.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8710CC-B-IP603.75YesNoGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZNoYesLED Emulator
Si8710CC-B-IS603.75YesNoNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZNoYesLED Emulator
Si8710CD-B-IS605.0YesNoWB SOIC63.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZNoYesLED Emulator
Si8711AC-B-IP603.75YesNoGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZYesYesLED Emulator
Si8711AC-B-IS603.75YesNoNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZYesYesLED Emulator
Si8711AD-B-IM605.0YesNoLGA83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZYesYesLED Emulator
Si8711BC-B-IP603.75YesNoGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZYesYesLED Emulator
Si8711BC-B-IS603.75YesNoNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZYesYesLED Emulator
Si8711BD-B-IM605.0YesNoLGA83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZYesYesLED Emulator
Si8711CC-B-IP603.75YesNoGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZYesYesLED Emulator
Si8711CC-B-IS603.75YesNoNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZYesYesLED Emulator
Si8711CD-B-IM605.0YesNoLGA83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZYesYesLED Emulator
Si8712AC-B-IP603.75YesYesGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8712AC-B-IS603.75YesYesNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8712AD-B-IM605.0YesYesLGA83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8712BC-B-IP603.75YesYesGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8712BC-B-IS603.75YesYesNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8712BD-B-IM605.0YesYesLGA83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional1015Hi-ZNoYesLED Emulator
Si8712CC-B-IP603.75YesYesGW DIP83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZNoYesLED Emulator
Si8712CC-B-IS603.75YesYesNB SOIC83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZNoYesLED Emulator
Si8712CD-B-IM605.0YesYesLGA83.0 - 30-40 to 125 °C3 - 30 V1Unidirectional101Hi-ZNoYesLED Emulator
Si8715BC-A-IP505.0YesNoWB SOIC62.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8715BC-A-IS503.75YesNoGW DIP82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8715BD-A-IS503.75YesNoNB SOIC82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8716BC-A-IP503.75YesYesGW DIP82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10HighNoYesLED EmulatorPush-pull
Si8716BC-A-IS503.75YesYesNB SOIC82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10HighNoYesLED EmulatorPush-pull
Si8717BC-A-IP503.75YesYesGW DIP82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8717BC-A-IS503.75YesYesNB SOIC82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8718BC-A-IP503.75YesYesGW DIP82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8718BC-A-IS503.75YesYesNB SOIC82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8719BC-A-IP505.0YesNoWB SOIC62.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8719BC-A-IS503.75YesNoGW DIP82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8719BD-A-IS503.75YesNoNB SOIC82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10Hi-ZNoYesLED EmulatorPush-pull
Si8720BC-A-IP503.75YesYesGW DIP82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10LowNoYesLED EmulatorPush-pull
Si8720BC-A-IS503.75YesYesNB SOIC82.5 - 5.5-40 to 125 °C2.5 - 5.5 V1Unidirectional10LowNoYesLED EmulatorPush-pull

Easy Drop-in Replacement for Optocoupler Solutions

The Si87xx digital isolator family is available in popular optocoupler configurations shown below, and most applications require no PCB modification — simply install the Si87xx into the optocoupler footprint (package options include SOCI8, DIP8, LGA8 and SDIP6). The Si87xx series feature are open drain outputs. Any external components used to improve optocoupler common mode transient immunity (CMTI), such as "speed-up" capacitors, negative voltage supplies and input buffers can be left intact or removed to reduce external BOM.
Si87xx digital isolator block configurations Si87xx digital isolator block configurations  
 

Optocoupler Replacement Technology

Used for more than 40 years, optocouplers are inherently limited by outdated LED-based technology, which exhibits significant output variation over input current, temperature and age. These variations reduce the operating performance and reliability over the optocoupler’s lifetime, resulting in increased design complexity and shorter life expectancy for end products. Because of their aging effects, optocouplers are often specified to last only 10 years, posing a serious problem for industrial system designers who want to develop products with 20+ year warranties.
Silicon Labs’ Si87xx optocoupler-replacement devices use a patented CMOS-based isolation architecture that is completely immune to the output variations that plague LED-based optocouplers. The innovative light-emitting diode (LED) emulator input included in the Si87xx devices eliminates the need to redesign existing systems.

Reliability over Time and Temperature

CMOS-based capacitive isolation technology provides more than ten times the mean-time-to-failure (MTTF) rate of optocouplers. By offering longer device lifetimes and higher reliability, the Si87xx isolators enable system manufacturers to support longer end product warranties and reduce costs associated with repair or replacement. Less variability, especially in the input turn-on current, also simplifies system designs since engineers no longer need to anticipate aging effects when using the Si87xx devices.
The Si87xx family is based on Silicon Labs’ industry-leading capacitive isolation technology, with isolation ratings up to 5 kV and fully compliant with IEC 60747-5-2 including 10 kV surge protection. The family meets the requirements for IEC 60950-1, 61010-1 and 60601-1 (reinforced insulation) and provides up to 1200 V working voltage with a 60+ year lifetime. The wide -40 to +125 °C operating range makes the Si87xx the perfect optocoupler replacement in high temperature applications such as solar inverters.
The Si87xx products are CSA and UL certified. CSA_UL_Logos
The Si87xx products are VDE certified. VDE_Logo

Performance Enhancements over Optocoupler Solutions

In addition to their inherent immunity to temperature, age and forward current effects, the Si87xx isolators offer other significant performance advantages over competing optocoupler solutions:
  • The Si87xx devices offer a 50 percent lower input turn-on current and a 10x lower output quiescent current than competing optocouplers, reducing overall system power.
  • The low parasitic capacitance of the Si87xx digital isolation architecture improves the common mode transient immunity (CMTI) by as much as 75 percent over competing optocouplers, thereby enhancing system data integrity. Due to the inherent high parasitic capacitance of their LED-based architecture, optocouplers suffer from poor CMTI, which can lead to incorrect data being passed across the isolator.
  • The Si87xx isolators outperform optocouplers in key timing specifications, such as propagation delay and pulse-width distortion, enabling faster, more accurate data transfer and improved efficiency.

Si84xx, Si86xx and Si87xx Top-Level Comparison

  Si84xx Si86xx Si87xx​
Max Isolation Voltage (kV) 2.5​ 5.0​ 5.0​
​Min CMTI (kV/µs) 25​ 35​ 35​
Input Device​ Buffer​ Schmitt Trigger​ Opto Emulator​
Input VDD Range (V)​ 2.7 to 5.5​ 2.5 to 5.5​ 1.7 to 2.8*​
Output VDD Range (V)​ 2.7 to 5.5​ 2.5 to 5.5​ 4.5 to 30​
Current/Ch at VDD = 5 V, 1 Mbps (mA)​ 1.65​ 1.25​ 2.5​
Max Prop Delay (nS)​ 9.5​ 9​ 60​
Max Pulse Width Distortion (nS)​ 2.5​ 1.5​ —​
Minimum Pulse Width (nS)​ 6​ 5​ —​
10 kV Surge Capability​ No​ No​ Yes​
Typ Rise/Fall Time at VDD = 5 V (nS)​ 5.0/3.7​ 3.5/2.0​ 12​
Output Latch​ None​ None​ None​
* Voltage shown is anode voltage with respect to cathode voltage​

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