Isolation

Different by design

Learn about our capacitive isolation technology

What is isolation?

Isolation is about reliable protection

Galvanic isolation is a circuit design technique that allows two circuits to communicate and eliminates any unwanted direct current that flows between them.

Isolation is used most commonly to:

  • Protect human operators and low-voltage circuitry from high voltages.
  • Prevent ground potential differences between communicating subsystems.
  • Improve noise immunity.
Block diagram showing the isolation barrier

Isolation blocks unwanted DC and AC across a dielectric barrier 

TI's capacitive barrier is designed for strength

Dielectric strength is the foundation of an isolator

Our high-quality isolators are built in our closely controlled wafer manufacturing facilities. In contrast, other isolation technologies, such as optocouplers, are built in assembly houses which can result in flaws and part-to-part variation.

  • We use the industry's highest dielectric strength insulator, SiO2, for the capacitive isolation barrier of our devices.
  • Each capacitive barrier is built using TI proprietary technology with strength exceeding 12.8 kV of isolation surge-voltage protection with a specified isolation voltage of 5.7 kV.
Isolated package pinout
Layers of high-dielectric SiO2 make up our capacitive isolation barrier

Isolation designed for high voltage

Reinforced isolation barrier design is key

The dual-capacitive isolation barrier offers reliable, high-voltage protection.

  • Our two-die design is separated by two capacitors.   
  • The left and right die of a TI reinforced digital isolator sit on a split lead frame, each with its own high-voltage capacitor.
  • The two die are connected through bond wires which serve as the only connection between the left and right side of the isolation device.
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A cross section of a TI isolator 

Designed for quality & reliability

Strength, quality and the most reliable isolation barrier lifetime

Industry certifications for isolation devices require high-voltage lifetime testing as proof of high-voltage robustness and reliability. Our on-site high-voltage labs and expert isolation technologists have worked for decades to develop and test high-quality, robust and reliable isolation barriers for our isolation products. 

  • Test data for our isolators demonstrates the industry's highest working voltage, with expected lifetimes over 100 years—more than 5 times the industry-standard 20 year minimum required for a certified digital isolation device.
  • We use the highest quality mold compound (CTI Level 1) and robust packaging to meet creepage and clearance requirements for high-voltage IEC standards.
  • Our isolation devices are certified across the latest industry standards, including the most recently released VDE 0884-11 requirements.  
Graph showing time to fail versus applied voltage

Isolation capacitor lifetime projection for reinforced insulation 

Learn more about our high-voltage testing from our experts

Enabling high voltage quality and reliability

Learn more about our high-voltage testing from our experts.