The CST2010-020L_ from Coilcraft is a Current Sense Transformer that is designed for automotive applications. This transformer has a primary current of 47 A and an isolation voltage of 1500 Vrms. It has an inductance of 0.34 mH, and a turn ratio of 1:20. This AEC-Q200 qualified transformer is designed for use over 1 MHz and has very low primary DC resistance. It is available in a surface-mount package.