Two-Channel, Bi-Directional Digital Isolators Reduce Space and System Complexity for Designers

by donpedro

MAX14933-MAX14937_PR-Graphic_Image_rgb_SPR_MAX14933_and_MAX14937_diagram_rgb_SDesigners can save space and achieve more flexible designs with the MAX14933 and MAX14937 two-channel, bi-directional digital isolators from Maxim Integrated Products, Inc. They transfer digital signals between circuits in both directions and provide complete galvanic isolation between two power domains, all while using fewer components to save board space.

The MAX14933 and MAX14937 are the newest additions to Maxim’s recently introduced ultra-robust portfolio of quad-channel digital isolators, which include MAX14930-MAX14932 and MAX14934- MAX14936. These devices provide best-in-class speed, propagation delay, skew, and jitter for timing sensitive applications while maintaining an extremely robust isolation barrier between two power domains.

Digital isolators are replacing optocouplers in many applications because they offer the same isolation capabilities while using less board space and consuming less power. The MAX14933 and MAX14937 provide high voltage isolation of 2.75kVrms or 5kVrms, respectively. They support data rates from DC up to 1.7MHz and can be used in isolated I²C busses with or without clock stretching. Both products feature independent 2.25V to 5.5V supplies on each side of the isolator, and provide open-drain channels for applications that require data to be transmitted in both directions on the same line. Applications include power supplies, battery management systems, instrumentation, and interfaces for I²C, SMBus, or PMBus.

Key Advantages

  • Space savings: Lowers component count and system complexity
  • Flexible interface: Interfaces with most microcontrollers and FPGAs running at various supply voltages
  • Robust galvanic isolation: More than 30 years lifetime at rated working voltage

These I²C, two-channel, bi-directional digital isolators provide a solution for designers who want to lower component count and system complexity,” said Tony Partow, Executive Business Manager at Maxim Integrated.

Availability and Pricing

  • The MAX14933 is available in both a 16-pin wide-body (10.3mm x 7.5mm) and narrow-body (9.9mm × 3.9mm) SOIC package. The MAX14937 is available in a 16-pin wide-body (10.3mm × 7.5mm) SOIC package
  • Pricing starts at $1.80 for the MAX14933ASE and $2 for the MAX14933AWE (1000-up, FOB USA). Pricing starts at $3.29 for the MAX14937AWE (1000-up, FOB USA)
  • Both products are specified over the -40-degree Celsius to +125-degree Celsius temperature range
  • An evaluation kit is available for both products: MAX14933WEVKIT# and MAX14937WEVKIT#
  • For more information about the family of products, visit

Maxim Integrated

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