Since 1949, Transformer Manufacturers, Inc.’s (TMI) expertise in manufacturing quality custom transformers and magnetic products has enabled them  to solve problems for their customers while meeting or exceeding their specifications and requirements.

Transformer manufacturing is their core business and all products are proudly made in America. TMI serves the global market from their facilities centrally located in the Chicago transportation hub.

Their products include power transformers (isolation transformers and autotransformers), audio transformers, choke transformers, toroid transformers and printed-circuit-mounted transformers for a wide range of industries. They specialize in small to mid-size magnetics.

The TMI manufacturing quality management system conforms to ISO 9001:2008. Transformer Manufacturers' plant offers value-centered manufacturing that is totally dedicated to high quality and continuous improvement. Our products incorporate the finest in materials and workmanship. We use advanced manufacturing methods for quality and value while minimizing waste and the impact on the environment. They fully test their transformers and related products before shipping.