Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28578C found under Transformer Audio F by Emerson Electric Co. The National Stock Number assigned to this part is 5950007545942, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28578C.