Coilcraft, Inc. High Power Transformers for Power over Ethernet RA7129-BLD

RA7129-BLD is a high-power PoE transformer designed for use with STMicroelectronics ST PM8804 and ST PM8805 controllers, optimized for the STEVAL-POE00xV1 evaluation board and compliant with the IEEE 802.3bt standard. It operates at 250 kHz with a 36-72 V input range, providing a 5 V, 20 A output. The primary inductance is 134 µH ±25% at 0 A and 250 kHz, with a DCR maximum of 0.0265 Ω for the primary and 0.0035 Ω for the secondary. The turns ratio is 1:0.333:0.667 for primary:secondary:auxiliary, and isolation is rated at 1500 Vrms. It is packaged in a surface-mount format with dimensions of 30.00 mm × 21.00 mm × 11.43 mm max, uses RoHS-compliant tin-silver-copper terminations, weighs 11.5-13.5 g, and operates from -40°C to +125°C ambient with a maximum part temperature of +165°C. The component is rated MSL 1 and is supplied on a 13-inch reel with 175 units per reel.