TDK-EPC has developed a series of Epcos EP5 SMT pulse transformers. They are used to couple gate-drive circuits to MOSFETs and IGBTs operating at switching frequencies within a range of 150 kHz to several MHz. These transformers are available with a wide range of turns ratios, polarities and outputs.

Thanks to the use of miniaturized EP5 cores, these transformers have dimensions of 8.1 x 6.7 x 5.4 mm³. As several transformers are usually used in a circuit, the size reduction of the transformers results in space savings on the circuit board. Thanks to a special winding technology, parasitic capacitances between windings are 25 to 95 pF, depending on the type.

Stray inductances range between 0.9 and 2.5 µH. Short-term dielectric strength is tested to 1500 V DC for all types of the B82804A series. These components are designed for ambient temperatures of up to 85°C and operating temperatures of up to 125°C. Their terminal configuration and pin assignment correspond to the industry standard.

The main applications of these new transformers are half- and full-bridge converters as well as in frequency converters or inverters.