Worcester, Mass. Allegro MicroSystems Inc. has launched an improved accuracy and extended range version of its existing ACS752 family of current sensors. The new ACS754/5 current sensors provide a smaller, lower cost alternative to toroid-based sensors for precise current sensing in industrial, consumer, communications and automotive systems.
The ACS754 devices feature bi-directional sensing, while the ACS755 versions offer single-direction sensing with approximately twice the resolution of the bi-directional ACS754 models. The devices provide 3 kV isolation and single voltage supply operation while placing only 100 μ Ω of resistance in the current path. Available in 50 A, 100 A, 130 A, 150 A and 200 A versions, the devices are available in both industrial and automotive temperature ranges.
The lead-free, PC-mountable package measures 14 x 22 x 7-mm overall, and integrates the current path, which eliminates the need to design your own magnetic circuit or thread your conductor through the device in manufacturing.
Consisting of a precision linear Hall IC optimized to an internal magnetic circuit to increase device sensitivity, the company said the combination of a precisely controlled self-aligning assembly process (patents pending) and factory-programmed precision of the linear Hall-effect sensors results in high-level performance and product uniformity.
The power lead frames are designed for extremely low power loss and are electrically isolated from the sensor signal leads. This isolation allows the ACS754/5 sensors to be used in applications requiring electrical isolation without the addition of other isolation components. The worst-case accuracy over the devices' total measurement and temperature range is 5% to 6% (depending on version) in industrial applications and 7% to 10% in extended temperature automotive applications. Accuracy at 25°C is better than 1%.
The ACS754/5 family is priced at $7.10 in quantities up to 1,000. Delivery is eight to ten weeks.
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