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1200A coreless closed loop TMR sensor

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By Nick Flaherty

The CUR 423x TMR sensor family is suitable for DC and AC measurements in high-current applications and can measure currents above 1200 A. The advantages of galvanic isolation of load current and measuring circuits are particularly useful in high-voltage battery monitoring systems in hybrid and electric vehicles (xEV). A signal-to-noise ratio and a total error below 1% (full scale) of the operating temperature allow precise current measurements in applications with a signal bandwidth of up to 5kHz. Samples will be available in the fourth quarter of 2019.

All components required for closed-loop operation, such as compensation coil, shunt resistor and TMR sensor bridge, are integrated in a small, 1 mm industry standard TSSOP16-SMD package. By eliminating the need for a large toroidal core, space and costs can be saved. The programming of digital offset and gain temperature compensation, low pass filter and clamping can be done with TDK-Micronas programming tools.

Two sensor variants with flux density ranges of ±7 mT and ±40 mT are available. Fine adjustment of the field ranges allows adaptation to different current measurement ranges in the application. Current sensor modules with the CUR 423x can be programmed in production via the output pin. Output formats selectable by the customer, such as SENT according to SAEJ2716 Rev.4, SPI or fully ratiometric analog, allow flexible adaptation to the application requirements.


The CUR 423x TMR sensor was developed in accordance with ISO26262 and offers “ASIL-B ready” functional safety, which is achieved by a series of integrated diagnostic functions. The CUR 423x is AEC-Q100 qualified and is designed for automotive applications in the temperature range -40 °C to +170 °C (TJ).

The new devices are the first products based on TDK’s TMR sensor technology to be marketed under the Micronas brand and bear the curSENS logo. TMR technology has proven itself in existing automotive sensor products and is now expected to pave the way for innovative coreless current measurements. The new sensors demonstrate the synergies resulting from the acquisition of Micronas by TDK’s Magnetic Sensor business in 2016.

More information: https://www.micronas.com/

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TDK to swallow Micronas for its Hall-effect expertise


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