• Key Features
• Product lineup

【The Need for High EMI Immunity Op Amps】

There are 2 main reasons for using high EMI immunity Op Amps The first is to shut out external noise in electronic devices that protect human lives and ADAS (Advanced Driver Assistance Systems) to prevent traffic accidents.
The second is to cope with increased noise generated by high voltage batteries and drive equipment along with high power motors in AC and power steering systems installed in electric vehicles.
ROHM’s high EMI immunity EMARMOUR™ Op Amp series provides stronger noise protection for electronic circuits.

"EMARMOUR™ Series" Key Features

Key Features 1. Industry-leading* noise immunity significantly reduces the design load for countermeasures

As shown in the graph of the output voltage fluctuation vs noise frequency below, in contrast to the measured peaks of standard and general-purpose high EMI immunity products that are easily affected by frequency-based noise, ROHM’s new products minimize fluctuations due to frequency, making it possible to limit output voltage variations to less than ±1% (vs ±3.5 to ±10% with standard products).
Achieving high EMI immunity greatly reduces the burden placed on designers of automotive electrical systems to develop noise countermeasures that typically require much time and effort.
This reduces the cost and space previously required for external components such as the CR filter and shielding.

*ROHM October 2021 study

Key Features 2. Significantly improving noise immunity by conducting a thorough review of circuits, layout, element size, and other factors

In addition to conducting a thorough analysis of previous products, adding noise countermeasures circuits, and reviewing the layout, ROHM selected processes that generate optimal capacitances to dramatically improve EMI immunity. The key to success was to utilize a flexible approach in selecting the optimum solution, rather than simply following the industry trend of reducing chip size. Breakthrough noise immunity could never be achieved with just one countermeasure, but was the culmination of 3 factors.

• Susceptibility to external noise is prevented by fully aligning the above 3 measures

Key Features 3. Significantly reducing the time, effort, and costs for noise countermeasures

High EMI noise immunity created from an unprecedented design eliminates the need for an external CR filter and shield previously required, contributing to greater space savings while reducing peripheral component costs.
Also, previously when integrating noise countermeasures, if noise evaluation fails after implementing functional and noise designs, it was necessary to start from the beginning, placing a considerable burden in terms of time, effort, and cost.
In response, ROHM’s high EMI immunity Op Amps allow users to significantly reduce design man-hours and costs, thereby reducing delivery times for short-term set designs.

Key Features 4. Provides superior versatility and complies with international standards for reliability

ROHM’s new high EMI immunity Op Amps maintain the same performance as conventional products, ensuring worry-free operation even when used as replacements.
In addition, compliance with the international automotive standard AEC-Q100 ensures superior reliability.

EMARMOUR™ Series Product Lineup

Op Amps

■High EMI Immunity Ground Sense Op Amps

■High EMI Immunity 150°C Operation Ground Sense Op Amps

☆: Development planned

■High EMI Immunity Ground Sense Op Amps

■High EMI Immunity Input/Output Rail-to-Rail Op Amps

■High EMI Immunity High Speed Ground Sense Op Amps

Comparators

■High EMI Immunity Open Collector Comparators

■High EMI Immunity 150°C Operation Open Collector Comparators

☆: Development planned

*EMARMOUR™, Nano Cap™ and ComfySIL™ are trademarks or registered trademarks of ROHM Co., Ltd.