Custom Planar Transformers — Taiwan Manufacturer

febetek designs and manufactures custom low-profile, high-frequency planar transformers in Taiwan. We build them on PCB and lead-frame windings, assembled under a UL-recognized transformer insulation system — the same precision-magnetics discipline behind our broader product line. If you are sourcing a planar transformer for a height-constrained, high-density power stage and need a partner who can take it from electrical spec to volume production, you are in the right place. Precision Magnetics. Faster Charging. is how we think about every component we make: tight, repeatable, and engineered for the converter it lives in. Tell us your topology, power, and mechanical envelope, and we will quote a custom build. Request a Quote →

What Is a Planar Transformer?

A planar transformer is a flat, low-profile magnetic component in which the windings are formed as flat copper layers rather than round magnet wire wound on a bobbin. The conductors are typically etched copper traces on a multilayer PCB, or stamped lead-frame / copper-foil layers, stacked and interleaved with insulation between them. These flat conductor layers sit inside a low-profile planar core — commonly planar variants of E/I, ER, or PQ shapes — that clamps over the layer stack.

This construction is the defining difference from a conventional wound transformer, where insulated round wire is wound turn-by-turn onto a bobbin around a vertical core. In a planar design, the "turns" are defined by copper geometry — trace width, layer count, and the via pattern that connects layers — instead of by hand- or machine-winding. Because the geometry is fixed by the PCB artwork or lead-frame tooling, every unit reproduces the same magnetic structure (a property core and material vendors describe in their planar application notes, e.g. Ferroxcube / TDK planar-core literature).

The flat, wide conductor layout and the thin overall stack are what give planar transformers their characteristic advantages — low height, large surface area for heat removal, and tight coupling between primary and secondary. The trade-offs (higher inter-winding capacitance, layout-sensitive AC resistance) are also geometry-driven, which is exactly why a planar transformer benefits from being designed for its specific converter rather than picked off a shelf.

Why Choose Planar? Key Benefits for Your Design

These are general properties of planar magnetics reported across the industry literature (core-vendor application notes and power-electronics references). They describe the planar approach as a class — not measurements of any specific febetek part.

• Low profile for height-constrained designs. A flat layer stack and planar core let the component sit far lower than an equivalent bobbin-wound part. This is the headline reason designers move to planar when board height or enclosure depth is the constraint (industry-general).
• High power density. Wide, flat copper handles current in a compact footprint, so planar transformers are commonly used where high power must fit a small volume (industry-general).
• Excellent thermal dissipation. The large surface-to-volume ratio and the PCB-integrated heat path give planar transformers strong heat-spreading behavior, often allowing operation at higher current density than a comparable wound part (industry-general physics).
• Tight winding coupling / low leakage inductance. Interleaving primary and secondary as adjacent flat layers couples them tightly, which the literature associates with low leakage inductance — valuable for resonant topologies such as LLC (industry-general).
• High repeatability and manufacturability at volume. Because the windings are defined by PCB artwork or lead-frame tooling rather than hand-winding, unit-to-unit consistency is inherently high — a real advantage when you scale from prototype to production (industry-general manufacturability argument; this is also the part of the planar story that aligns with how febetek builds magnetics).

Capabilities & Specs to Define — What febetek Can Build

Below is the set of parameters to lock down before you send an RFQ for a custom planar transformer. The left column is the parameter; the right column states what febetek builds to your spec versus what you define per project. Concrete numeric ceilings (max power, frequency limit, minimum height, lead time) are intentionally left as TBD here — we quote them against your actual spec rather than publish generic limits.

| Parameter | febetek capability / status |
|---|---|
| Winding construction | PCB windings and lead-frame windings — both available |
| Insulation system | Built under a UL-recognized transformer insulation system (UL E533808) — product-level scope, transformer insulation system |
| Turns ratio | Custom — defined per your topology |
| Isolation / creepage / clearance | Custom — specified to your isolation class and the relevant safety standard (e.g. per IEC 60664 creepage tables, defined per project) |
| Profile height | Custom; specific minimum height — TBD |
| Power range | TBD |
| Switching frequency range | TBD |
| Topology | Defined per your converter (e.g. LLC, phase-shifted full-bridge, flyback, push-pull) |
| Core material / shape | Planar E/I, ER, PQ and similar; ferrite material grade selected for your frequency and loss target |

If you already have a reference design or a competitor part you are trying to second-source, send it — that gives us the fastest path to a matching custom build.

Applications We Power

Custom planar transformers fit the high-frequency, density-driven power stages that show up across modern electronics. These are the standard application areas for planar magnetics (industry-general):

• Isolated DC-DC converters — bus converters and intermediate-bus architectures where height and density matter.
• Telecom / datacom and server power — front-end and point-of-load conversion in space-constrained racks and sleds.
• Automotive / EV power — on-board chargers (OBC) and high-voltage-to-low-voltage DC-DC converters.
• LED drivers — isolated, low-profile drive stages.
• Industrial SMPS — compact switch-mode supplies for equipment and automation.

This sits naturally alongside febetek's core business: we are a magnetics maker (EMI common-mode chokes, inductors, transformers) and we build the power stages behind fast-charging modules, so power-electronics magnetics is our home ground. We design to your application — we do not publish customer names or shipment figures.

How to Engage — Custom Planar Design & RFQ Process

Custom planar work runs through our RFQ flow rather than a fixed catalog page. The engagement is straightforward:

1. Submit your spec / requirements — through the RFQ form.
2. Design proposal — we return a proposed construction (winding stack, core, isolation approach) against your spec.
3. Prototype sample — we build samples for your bench and system validation.
4. Volume production — once the sample is approved, we move to series production.

To get a useful first response fast, include in your RFQ:

• Electrical spec — input/output voltages, power, switching frequency, topology (LLC / PSFB / flyback / push-pull), turns ratio if known.
• Mechanical envelope — maximum height and footprint, mounting and termination preferences.
• Isolation / safety requirements — working voltage, isolation class, creepage/clearance or the standard you must meet.
• Target volume — prototype quantity and expected annual production.
• Application — so we can advise on core material and construction.

We quote prototype and production lead time against your specific part.

Request a Quote — Magnetics · Transformers →

Why Source Planar Transformers From febetek

For a B2B magnetics partner, what matters is verifiable credibility — so here is exactly what febetek brings, stated precisely:

• A magnetics designer and maker since 2016, headquartered in Taiwan (New Taipei). Our day-to-day is precision magnetics for power electronics, which is the same engineering discipline a custom planar transformer demands.
• ISO 9001 quality management — company-level quality system.
• UL E533808 — transformer insulation system. This is a product-level recognition scoped to the transformer insulation system; we build planar transformers under it. It is not a company-wide certification and not a blanket product-safety mark — we label it precisely on purpose.
• RoHS / REACH material compliance documentation is available on the relevant product pages.

There is also a practical sourcing angle: febetek serves a dual market — domestic Taiwan plus overseas, including the Asia / Japan electronics ecosystem. If your supply chain already reaches into the region, a Taiwan-based magnetics partner shortens the loop between design iteration and tooling.

We do not claim certifications we do not hold, and we do not publish track-record, headcount, or shipment numbers beyond "since 2016." If a credential is not listed above, assume we have not claimed it.

Related Series & Internal Links

Planar is one node in our transformer line. Explore the rest of the cluster:

• Planar Transformers — series page
• Transformers — L1 overview
• Transformers for DC-DC Converter
• Transformers for AC-DC Converter
• Gate Drive Transformers
• Current Sense Transformers

Power Your Planar Design With febetek

Bring us the topology, the power, and the height you have to hit — we will design the planar transformer around it and quote prototype-to-production. Reach us at [email protected] or send your spec directly through the form. febetek is headquartered in Taiwan.

Request a Quote — Magnetics · Transformers →