TDK Corporation has introduced two new EPCOS SMT current sense transformers for automotive electronics. The devices are designed for use in emerging 48-V automotive power systems as well as for all xEV applications, where the components can be used to measure the currents of the electric drives.
The B78417A2185A003 device is based on an EP7 ferrite core and measures 10.6 mm x 12.2 mm x 11 mm. It is designed to measure pulse currents of up to 20 A. The DC resistance is 1.3 mΩ on the primary side and 3.7 Ω on the secondary side. The B78419A2251A003 part contains an EP10 ferrite core and measures 12.8 mm x 13.6 mm x 14.4 mm. The measurement range of the larger type extends to 30 A. Its DC resistance is 0.5 mΩ on the primary side and 2.7 Ω on the secondary side.
Both transformers offer a turn ratio of 1:100 and are suitable for a wide temperature range from -40 to +150 °C. The test voltage between the primary and secondary sides is 2800 V DC. The creepage and clearance distances meet the requirements for basic insulation according to IEC 60664. The new transformers are qualified to AEC-Q200.