Digital isolators provide robust galvanic isolation

June 02, 2016 // By Graham Prophet
These two-channel, bi-directional digital isolators reduce space and system complexity, says Maxim Integrated; the MAX14933 and MAX14937 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 join Maxim’s portfolio of quad-channel digital isolators, which provide speed, propagation delay, skew, and jitter for timing sensitive applications while maintaining an extremely robust isolation barrier between two power domains.


Digital isolators, Maxim contends, 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 2.75 kVrms or 5 kVrms, respectively. They support data rates from DC up to 1.7 MHz 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.

The offer space savings, with lower component count and system complexity; and provide a flexible interface to most microcontrollers and FPGAs, running at various supply voltages. They are rated for more than 30 years lifetime at rated working voltage. The MAX14933 is available in both a 16-pin wide-body (10.3 x 7.5mm) and narrow-body (9.9 x 3.9mm) SOIC package. The MAX14937 is available in a 16-pin wide-body (10.3 x 7.5mm) SOIC package. Pricing starts at $1.80 for the MAX14933ASE and $2 for the MAX14933AWE. Pricing starts at $3.29 for the MAX14937AWE (all 1000). Both products are specified over the -40 to +125C temperature range; an evaluation kit is available for both products: MAX14933WEVKIT# and MAX14937WEVKIT#.


Maxim Integrated;