The SMPS Transformers, or Transformers for Off-line and DC-DC Switching Converters, are among the most important inductive components that we produce.
Due to the specificity of each switching converter project, we supply the SMPS Transformers exclusively as custom products, ensuring every design is tailored to customer requirements.
We mostly manufacture SMPS Transformers according to a specification defined by the customer or referring to third-party specifications, such as the output of automatic design tools offered by controller manufacturers.
Nevertheless, automatic tools often propose designs with significant room for optimization. In agreement with the customer, we can revise the specs for SMPS Transformers to achieve improved dimensions, lower costs, or enhanced performance.
You can see here some reports proving our optimization capabilities; in these cases, our SMPS Transformers have surpassed the performance of components designed and optimized by leading companies in the electronic market.
When required, we can carry out the entire transformer design based solely on the customer’s technical data.
Our know-how and 30+ years of experience in both technical and safety standards allow us to provide excellent support, which also includes pre-compliance analysis for the SMPS design.
If you are interested in SMPS Transformers for resonant applications, visit this page.
For flyback, push-pull, forward, and any other topology, the preferential sizes of the most common SMPS Transformers are listed below.
These sizes are suggested but non-binding; our specialty is to meet any requirement. SMPS Transformers with particular characteristics such as larger sizes, SMD versions, increased creepage/clearance types, and more are also currently supplied.
SMPS Transformers are not only critical for energy transfer but also for ensuring compliance with EMI and safety regulations. Their design directly impacts efficiency, thermal performance, and insulation reliability.
For example, when dealing with high-frequency operation, the choice of core material and winding layout becomes fundamental in reducing losses and avoiding parasitic effects. In addition, reinforced insulation systems and optimized creepage/clearance distances are crucial for meeting international standards such as EN 61558 and IEC 62368.
Proper dimensioning of the SMPS Transformers also contributes to reducing the overall converter footprint while maintaining safety margins and long-term reliability.
- Preferred Sizes for Flyback Transformers and Low Power Units
- Suited to converters based on any controller
- High dielectric strength and reinforced insulation to meet safety requirements
- UL Recognized Components available on request
| Layout | Power (1) | Max Dimensions |
||
| A | B | H | ||
| E10A | 0-2W | 12,5 mm | 16,3 mm | 13,6 mm |
| E12A | 2-6W | 14,2 mm | 20,6 mm | 10,3 mm |
| E13A | 4-8W | 14,8 mm | 19,3 mm | 14,7 mm |
| E16A | 7-15W | 17,3 mm | 19,3 mm | 14,2 mm |
| E20A | 15-25W | 21,7 mm | 25,6 mm | 16,6 mm |
| E25A | 20-45W | 26,7 mm | 19,4 mm | 31,7 mm |
| E25B | 40-70W | 26,9 mm | 33,2 mm | 21,7 mm |
| E25C | 20-45W | 28,4 mm | 33,7 mm | 20,4 mm |
(1) For reference only; Power range refers to offline flyback converters; the actual max power depends on the design details and features.
The power can be 20% or more higher in low input voltage or functional insulation flyback converters, 100% higher in push-pull converters.
The 3D file can be downloaded from the pdf sheet
