Switch-mode transformers

Switch-mode transformers are one of the most important components in a switch-mode converter.

The component used can make all the difference in the performance of the entire application. Designers need to consider accurate design specifications in terms of circuit topology, frequency of operation, number of windings, core materials, heat dissipation, and form factor.

As it is important selecting a transformer that can work with the semiconductor controller of the converter, some of our technical supply partners can offer transformers directly developed with semiconductor application engineers. Our offer of standard products covers a wide range of applications. In addition, we can easily adapt existing products to meet the design needs for bespoke solutions.

Product ranges in switch-mode transformers

74000 series flyback switch-mode transformers
Myrra
74000 series flyback switch-mode transformers

Switch-mode transformers used in switch-mode power supplies due to their compactness and efficiency

Planar switch-mode transformers
Champs Technologies
Planar switch-mode transformers

A low-profile component due to tooled ferrite core shapes that are available

Switch-mode Transformer
JQH - Shenzen JingQuanHua Electronics Co. Ltd
Switch-mode Transformer

Engineered for switching power supply standards, the JQH planar transformer offers a compact, low-profile design, with customisable options to meet performance requirements.

FAQs about our switch-mode transformers for power electronics and SMPS applications

Switch-mode transformer FAQs

A switch mode transformer is a high-frequency magnetic component that transfers energy and provides isolation in SMPS topologies (flyback, forward, active-clamp, etc.). Correct selection of topology, frequency, windings, core material, thermal path and form factor is critical to overall converter performance—hence our design alignment with the chosen controller.

In power-electronics parlance, both switching transformer and switch transformer refer to the same class of high-frequency parts used in switched converters; they differ from 50/60 Hz mains units by operating at kHz levels with ferrite or other high-frequency cores to achieve compact size and high efficiency.

Yes. We stock catalog switch mode transformers for rapid design-in and can adapt an existing design—or build new—to match controller characteristics, safety insulation, leakage targets, and thermal limits. Some ranges are co-developed with semiconductor application engineers for best fit.

A quality switch mode power supply transformer balances reinforced insulation (creepage/clearance), low leakage inductance, controlled capacitance, and low copper/core losses at the intended switching frequency—while meeting agency requirements (e.g., UL systems) and ambient ratings.

Choose planar when you need a low-profile switch mode transformer with repeatable leakage and capacitance, excellent volumetric efficiency, and strong heat spreading from the flat core geometry. Planar construction (often PCB-embedded windings) minimises AC resistance and proximity losses and eases automated assembly.

You can source a switch mode transformer directly from Acal BFi. We offer off-the-shelf catalog switch mode transformers (including flyback and planar ranges) for rapid prototypes, plus modified-standard and fully custom builds aligned to your controller, insulation class, leakage targets, and thermal limits. Share input range, topology, power, isolation requirement, max height/footprint, and compliance standards, and we will recommend the right switching transformer—whether a standard item or a tailored switch mode power supply transformer.