High-Frequency Inductor Manufacturer: RFQ Guide
At 1–100 MHz, an inductor is defined by its operating point, not its nominal inductance: give the manufacturer the switching frequency, ripple waveform, DC current, inductance at current, thermal budget and size — then verify their loss data, testing depth and qualification. The RFQ checklist in this guide gets you comparable quotes from high-frequency inductor manufacturers.
High-frequency inductors for AI GPU VRM, server POL and compact converters are specified by their operating point. A good RFQ gets you a good part; a vague one gets you a datasheet that looks good and fails in the field. Here is what a high-frequency inductor manufacturer needs from you.
1. The five numbers that matter
| Parameter | Why the manufacturer needs it |
|---|---|
| Switching frequency | Core material and loss data are frequency-specific |
| Ripple current waveform | Loss depends on the real ΔB swing, not a sine assumption |
| DC current & peak | Sets saturation margin and bias-stability requirements |
| Inductance at current | The value must hold at full load, not at zero current |
| Thermal budget & size | Decides core size, DCR and package |
2. Material and construction
At 1–100 MHz, molded metal inductors with FeNi-based or composite cores keep permeability stable under bias and loss manageable. Ask which core material the quote uses, the permeability grade and the bias curve — then compare quotes on the same operating point, not on the same part number.
3. Testing to verify
- L vs DC bias curve at the operating current
- Core loss or temperature rise at the actual switching frequency
- DCR and AC resistance at the ripple frequency
- Saturation current definition (inductance roll-off % vs current)
- Qualification coverage for the target application (e.g., server-grade endurance, AEC-Q200)
4. The RFQ checklist
- Topology, switching frequency and ripple ratio
- Inductance, rated current, peak current and allowed roll-off
- Ambient temperature range and allowed temperature rise
- Footprint, height and termination (SMD / through-hole)
- Target efficiency or DCR, and qualification standard
- Prototype quantity and validation timeline
The High-Frequency Inductor Design note explains how each parameter drives the design, and the Power Inductor Spec Guide covers the broader specification. YUTE’s molded inductors are built on FeNi-based cores with in-house testing; frequency capability is confirmed per part number.
Submit the checklist through the engineering RFQ and our engineering team will respond with a technical evaluation on the next business day.
Frequently Asked Questions
What information should an RFQ for a high-frequency inductor include?
Five parameters do most of the work: switching frequency, ripple current and its waveform, DC and peak current, the inductance required at that current, and the thermal and size budget. Without them, quotes are not comparable between suppliers.
Why is nominal inductance not enough at high frequency?
Because the core’s permeability changes with bias and frequency, and the loss depends on the real ripple waveform rather than a sine approximation. The inductance that matters is the value at the operating point, not the value measured at zero current.
What core material suits MHz switching inductors?
Metal alloy or composite cores are the common choice at MHz switching, because they combine high saturation with permeability that remains reasonably flat beyond 10 MHz. Manganese-zinc ferrite becomes lossy at those frequencies.
What testing should a high-frequency inductor supplier provide?
Inductance versus DC bias at the operating point, core loss data at the real frequency and flux swing, DCR measurement, and temperature rise measured under load. These confirm the part behaves as intended rather than only meeting a nominal specification.
Should I validate samples in the real circuit?
Yes. Simulation and datasheet comparison narrow the options, but measuring loss and temperature rise on a prototype at the actual operating point is what confirms the part will work in the converter.
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