Compact surface mount current sense transformer

May 15, 2020 //By Nick Flaherty
The EPCOS B82801A1 current sense transformer series from TDK
The EPCOS B82801A1 current sense transformer series from TDK has nine types with currents up to 7A and frequencies up to 1MHz.

TDK has launched a compact surface mount (SMT) current sense transformer series for switched mode power supply designs

The EPCOS current sense transformer family is designed for measuring currents of up to 7A at frequencies between 50 kHz and 1 MHz.

The B82801A1 current sense transformer series has nine types with transformation ratios from 1:20 to 1:150 between the primary and secondary winding. The maximum DC resistance of the primary winding for all types is only 2.5 mΩ. High levels of reproducibility and reliability come from a highly automated production using laser welding technology.

The compact design of the RoHS-compatible current sense transformer is key for reducing the size of switched mode power supplies. The footprint is 4.5 x 4.85 mm and the height is 3.5 mm, which, coupled with an  insulating coating on the ferrite cores provides a space-saving installation on tightly populated boards. The test voltage of the windings is 500 V.

Applications for the current sense transformer series include overload detection and detection of load shedding in switched mode power supplies.

Further information is at

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