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SMT current sense transformers target car electronics

03 Nov 2014

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TDK Corp. has announced a couple of EPCOS SMT current sense transformers aimed at automotive electronics. The first type (B78417A2185A003), based on an EP7 ferrite core and has dimensions of 10.6 x 12.2 x 11mm, is geared to measure pulse currents of up to 20A. It features DC resistance of 1.3mΩ on the primary side and 3.7Ω on the secondary side. The second SMT current sense transformer (B78419A2251A003) has an EP10 ferrite core and measures 12.8 x 13.6 x 14.4mm, offering DC resistance of 0.5mΩ on the primary side and 2.7Ω on the secondary side. The measurement range of the larger type extends to 30A, detailed the company.

EPCOS SMT current sense transformer

Both transformers have a turn ratio of 1:100 and supports -40°C to 150°C temperature range. The test voltage between the primary and secondary sides is 2.8kVDC. The creepage and clearance distances meet the requirements for basic insulation according to IEC 60664. The transformers are qualified to AEC-Q200.

The SMT current sense transformers are intended for emerging 48V automotive power systems as well as for all xEV applications, where the components can be used to measure the currents of the electric drives.

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