From version 8.4, while it is of course still possible to model transformers as previously, it is not recommended since

- The previously used method of transformer modeling is not compatible with the usage of the Magnetics Design Module (MDM)
- Even if MDM is not being used, the transformer should be modeled in a manner consistent with the other SIMPLIS multi-level models, using the new Multi-Level Lossy Transformer (Version 8.4+).