On July 3, 2024, Telexis, a global microelectronics engineering company, announced that the MLX91220 (5V) and MLX91221 (3V) current sensor chips have obtained new safety certifications (UL/IEC 62368-1). The new sensor chip can now be used in systems with higher voltage isolation requirements for SOIC8 and SOIC16 packaging. Among them, the SOIC8 package provides basic isolation capability of 715V and enhanced isolation capability of 307V, while the SOIC16 package provides basic isolation capability of up to 1415V and enhanced isolation capability of 707V. This upgrade not only expands the application scope, but also reduces the number of components in the bill of materials. Applications that require enhanced isolation include in vehicle chargers (OBCs) and HVAC/compressors.

To ensure the safe operation of high-voltage Class 3 energy sources such as 800V electric vehicle battery packs and chargers, and to meet necessary isolation standards, double isolation barriers must be implemented to reduce risks. Previously, MLX91220 and MLX91221 were only certified as basic (i.e. single) isolation devices, and engineers needed to add additional components in the design, such as isolation amplifiers.

Now, the Hall effect sensor chips of Meilaixin have passed the new UL/IEC 62368-1 certification, and engineers can use these chips with confidence because they have enhanced isolation function and do not require additional isolation barriers to effectively protect end users from high voltage risks. The new voltage level is (applicable to pollution level 2):

SOIC16 packaging: Basic isolation (BI) is 1415V, enhanced isolation (RI) is 707V;

SOIC8 packaging: Basic isolation (BI) is 715V, enhanced isolation (RI) is 307V.

Now, engineers can remove unnecessary additional isolation components when using MLX91220 or MLX91221. In addition, for systems that currently adopt a single isolation design, it provides the possibility of re certification as a dual isolation system without the need to change the bill of materials.

This upgrade is only implemented in the form of further technical certification, which not only enhances the value of popular Hall effect sensor chips, but also greatly simplifies the design process and reduces related engineering work and costs. This solution maintains its high precision, flexibility, and plug and play characteristics while also providing enhanced security measures for various applications, such as automotive on-board chargers (OBCs), DC/DC converters, high-voltage chargers, renewable energy inverters, white goods, and robots.

"Through the new MLX91220 and MLX91221 certifications, we provide engineers with a convenient solution to enhance isolation," said Bruno Boury, Director of Meilaixin's Product Line. "We have effectively upgraded 50 product variants without requiring customers to bear additional costs, helping them meet critical safety requirements with just one component, not only reducing production costs but also reducing packaging restrictions."

MLX91220 and MLX91221 have established a solid market position in automotive and industrial applications due to their excellent reliability. This time, it further consolidated its market leading position through additional security certification. These two current sensor chips use a cost-effective and miniaturized SOIC8 narrow body package with a 4mm creepage distance, as well as a larger SOIC16 wide body package with an 8mm creepage distance. They all have a bandwidth of 300 kHz, a short response time of 2 microseconds, and support a current range of 0-50A RMS, providing accurate and efficient current detection solutions for various applications.

This is reported by Top Components, a leading supplier of electronic components in the semiconductor industry

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Name: John Chen

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