Custom Planar Transformers
Planar transformers use flat PCB or stamped windings and low-profile ferrite cores to deliver high power density, excellent repeatability and superb thermal performance for demanding switch-mode supplies. P&A International engineers, prototypes and delivers custom planar transformers, typically 100 W to several kW, 100 kHz to 1 MHz+, built to your converter, stack-up and footprint.
As an engineering-led contract manufacturer founded as an engineering consultancy, we assign one dedicated engineer to your project from DFM review to qualified samples in 10–15 working days, then scale into volume through our vetted partner-factory network, where every supplier is ISO 9000 certified or better.Request a quote ›
consultancy + manufacture
per project, end-to-end
qualified samples with test data
every supplier certified or better
one-off to high volume
Why choose PA planar transformers
Low profile, high density
Flat PCB-stack windings and planar cores give high power density in a low-profile package.
Repeatable & cool
PCB-defined windings give tight unit-to-unit repeatability and a large surface area for cooling.
Low leakage
Interleaved copper layers cut leakage inductance and AC resistance for efficiency at high frequency.
Built to your stack
Core, layer count, copper weight and footprint designed and DFM-reviewed for your board.
Engineering capability
- Magnetic design & simulation — turns, leakage, AC resistance, core loss, thermal modelling
- PCB-stack design — layer count, copper weight, interleaving and creepage
- Planar core grade and clip selection for power density at your frequency
- Safety construction — creepage/clearance and insulation to IEC 62368-1 as specified
- Integration with your PCB / busbar and thermal interface
- DFM review to hit target cost while preserving performance
- Qualified samples with full test data before any volume tooling
- One dedicated engineer owns the project end-to-end
At a glance
| Type | Planar — PCB or stamped winding |
| Power | ~100 W – several kW |
| Frequency | 100 kHz – 1 MHz+ |
| Topologies | LLC, phase-shift full-bridge, forward, push-pull |
| Isolation | To CE/UL/IEC 62368-1; reinforced available |
| Profile | Low-profile; PCB or chassis integration |
| Prototype | 10–15 working days to qualified samples |
| Quality | Every supplier in our network is ISO 9000 certified or better |
Why engineers & buyers choose PA
For design engineers
A true design partner — one dedicated engineer, full simulation and DFM support, rapid samples, and planar transformers optimised for leakage, AC resistance, thermal and power density. We design the PCB stack-up to your converter — not just catalogue parts.
For purchasing
Low-risk scalability — predictable 10–15-day prototypes, flexible MOQ from one-off to production, target-cost DFM, a single point of contact, and a vetted ISO 9000+ partner network managed end-to-end by P&A. No hand-offs, no surprises.
3 easy steps to get started
Send us your spec
Send your drawing or spec sheet. One dedicated engineer reviews it and confirms the technical details with you.
Proposed design & quote
You receive a proposed design and indicative pricing — typically within 48 hours — to review and refine together.
Samples & production
Qualified samples with full test data in 10–15 working days; on approval we scale into volume through our partner network.
Applications
High-density AC-DC & DC-DC converters · EV and traction power · telecom and server power · renewable and energy-storage converters · industrial high-frequency supplies.
Explore related types: high-frequency & switch-mode magnetics, SMPS and inductors.
Choosing the right planar transformer
A few decisions shape every planar design — sharing this detail lets us quote and prototype faster:
| When planar wins | Choose planar for low profile, high power density, excellent repeatability and thermal performance at high switching frequency. |
| Stack-up & copper | Layer count, copper weight and interleaving set leakage, AC resistance and current capability; we co-design with your PCB. |
| Core & frequency | Planar core grade and size are chosen for loss and saturation at your frequency and power. |
| Thermal & integration | Surface area, clips and thermal interface to your heatsink or cold plate are designed in. |
| Isolation & safety | Creepage/clearance and insulation to IEC 62368-1, CE and UL designed into the stack-up from the start. |
What to send us for a fast, accurate quote
The more of this you can share, the quicker we can return a proposed design and price:
- Topology, switching frequency, input/output voltages and power
- Whether windings are in your PCB or a discrete part
- Target profile/height, footprint and thermal interface
- Isolation and safety requirements, and target standards
- Efficiency / leakage targets and any EMI constraints
- Target cost and annual volume or call-off pattern
- Any reference design, competitor part number or stack-up
Working from a competitor part or a sample is fine — our engineer will reverse-engineer it or design a drop-in equivalent to your specification.
📄 Download the planar transformer RFQ checklist & selection quick reference (PDF)
Get a quote
Send your topology, frequency, power and target footprint and one dedicated engineer will reply — typically within 48 hours — with a proposed design and indicative pricing.
One dedicated engineer reviews every enquiry and replies with a proposed design and indicative pricing. Your details are used only to respond to your enquiry. Prefer email? support@pa-international.com.au