The PDC023-EP13A05S from Bourns is a DC-DC Transformer that is ideal for high efficiency power over Ethernet (PoE) interface and DC-DC controllers, PoE power delivery (PD) controllers, and synchronous flyback converter applications. It has an inductance of 37 µH and a turns ratio of 4.5:1. This transformer has a DC resistance of less than 5 milli-ohms. This RoHS-compliant transformer operates over a temperature range from -40°C to +125°C. It is available in a surface-mount package that measures 17.5 x 13.0 mm.