Custom High-Frequency & Switch-Mode Magnetics
Switch-mode designs live or die on the magnetics. P&A International engineers, prototypes and delivers custom SMPS and planar transformers, LAN & signal transformers, common-mode chokes, and power & SMD inductors — EE, EF, ETD, EFD, RM, PQ and planar cores, 1 W to 3 kW, 20 kHz to 1 MHz+ — built exactly to your schematic, target cost and compliance requirement.
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.
consultancy + manufacture
per project, end-to-end
qualified samples with test data
every supplier certified or better
one-off to high volume
What we make
SMPS & switch-mode transformers
EE, EF, ETD, EFD, RM & PQ ferrite cores. Flyback, forward, push-pull, half/full-bridge, LLC & planar. 1 W–3 kW, 20 kHz–1 MHz+. Low leakage, optimised core loss.
LAN & signal transformers
Ethernet, PoE & data-line isolation. Pulse and signal magnetics for clean signal integrity, with reinforced isolation built to IEC 62368-1 / UL as specified.
Common-mode chokes
EMI/EMC suppression and current sensing for power and data lines. High-permeability cores, low insertion loss, precise winding for stable HF operation.
Power & SMD inductors
Power, filter, flat-wire high-current & SMD inductors. Broad L/I range with litz, foil and multi-layer options for low AC resistance and high saturation.
Engineering capability
- Magnetic design & simulation — turns ratio, leakage inductance, core loss, AL value, thermal modelling
- Core grade & planar PCB-stack selection for power density and repeatability
- Thermal & efficiency optimisation; EMI/EMC mitigation
- Safety construction — reinforced or triple-insulated wire; creepage/clearance to IEC 62368-1 and 61558
- DFM review to hit target cost while preserving performance
- Built-to-spec compliance (CE/UL/IEC as specified)
- Qualified samples with full test data before any volume tooling
- One dedicated engineer owns the project end-to-end
At a glance
| Cores | EE / EF / ETD / EFD / RM / PQ / EP / pot / planar |
| Power | 1 W – 3 kW |
| Frequency | 20 kHz – 1 MHz+ |
| Topologies | Flyback, forward, push-pull, half/full-bridge, LLC, planar |
| Isolation | To CE/UL/IEC; reinforced insulation available |
| Prototype | 10–15 working days to qualified samples |
| Quantities | One-off prototypes to high volume |
| 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 magnetics optimised for efficiency, leakage, thermal and EMI. We routinely target leakage-inductance reduction and first-pass DFM approval on demanding topologies such as LLC resonant converters — not just off-the-shelf 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 schematic 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
Power supplies & chargers · AC-DC / DC-DC converters · industrial & renewable-energy power · telecom, data & PoE infrastructure · LED drivers · energy storage & battery management · consumer and medical electronics.
For lower-frequency and mains designs, see our low-frequency & power transformers, including toroidal, encapsulated and three-phase types.
Choosing the right switch-mode magnetics
Getting the magnetics right early saves costly re-spins later. A few decisions shape every high-frequency design — and sharing this detail lets us quote and prototype faster:
| Topology first | Flyback for low-power isolated rails; forward / two-switch forward for mid-power; push-pull, half- and full-bridge for higher power; LLC resonant for soft-switching and high efficiency. Topology, switching frequency and I/O voltages set the core and winding strategy. |
| Core & material | EE, EF, ETD and EFD cover most SMPS work; RM and PQ give compact, low-EMI designs; planar suits low-profile, high-power-density builds. Ferrite grade balances core loss, saturation and cost at your frequency. |
| Leakage & efficiency | Winding strategy — interleaving and sandwiching — controls leakage and AC/proximity losses, which drive efficiency, snubber design and EMI. We model and minimise it. |
| Thermal headroom | Temperature rise comes from combined core and copper loss; we select bobbin, wire gauge (including litz) and potting to keep the part inside your thermal limits. |
| Isolation & safety | Creepage and clearance, the insulation system (reinforced or triple-insulated wire) and compliance to IEC 62368-1 / 61558, CE and UL are designed in 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:
- Schematic or topology, plus switching frequency
- Input/output voltages, currents and power (turns ratio if known)
- Isolation and safety requirements, and target standards
- Mechanical envelope — height, footprint, mounting — and any thermal limits
- Target cost and annual volume or call-off pattern
- Any reference design, competitor part number or physical sample
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 RFQ checklist & core-selection quick reference (PDF)
Get a quote
Send your schematic, spec sheet or target requirements and one dedicated engineer will reply — typically within 48 hours — with a proposed design and indicative pricing. No project too big or too small.
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
Frequently asked questions
Can you design from a spec, reference design or sample?
What power levels and switching frequencies do you cover?
Do you make planar transformers?
How fast are prototypes, and what are typical MOQs?
What quality and safety standards do you support?
High-frequency & switch-mode types
Explore the range: SMPS & switch-mode transformers, planar transformers, LAN & signal transformers and inductors & chokes. For mains and 50/60 Hz designs, see our low-frequency & power transformers.