Initial inductance
Measured at low current before any roll-off. Ranges from about 100 to 500 nanohenries across the WHPBU series, which suits high frequency multiphase stages.
Inductor products
High Current Power Bead Inductors
These are single-winding power bead inductors for multiphase buck converters and point-of-load stages: nanohenry inductance, sub-milliohm DC resistance and saturation currents past a hundred amps. Select on the hot saturation figure and the heating current, not the room-temperature number.
Part number search & selector
Find High Current Power Bead Inductors part numbers
The table uses the current English-site product records, published selection fields and part-specific technical-file links.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
| Image | Datasheet | Compare | Downloads |
category
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Initial Inductance (nH)
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Tolerance (±%)
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DCR(mΩ)
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1-Saturation Current@25℃ (Amps)(typ)
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2-Saturation Current@100℃(Amps)(typ)
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Heating Current(Amps)(typ)
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| Image | Part number | Datasheet | Compare | Downloads | category | Initial Inductance (nH) | Tolerance (±%) | DCR(mΩ) | 1-Saturation Current@25℃ (Amps)(typ) | 2-Saturation Current@100℃(Amps)(typ) | Heating Current(Amps)(typ) | Sample |
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WHPBU-150705N-R15L0 | SPEC | WHPBU-150705N | 150 | 15 | 0.47±7% | 72 | 60 | 53 |
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WHPBU-150705N-R12L0 | SPEC | WHPBU-150705N | 120 | 15 | 0.47±7% | 87 | 75 | 53 |
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WHPBU-150705N-R10L0 | SPEC | WHPBU-150705N | 100 | 15 | 0.47±7% | 105 | 80 | 53 |
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By series
WHPBU series by current capability
Series differ in body size, which sets DC resistance and how much current each phase carries.
How to select
Selecting a power bead inductor in four steps
Phase count and ripple set the inductance; thermals and peak current set the series.
- 01
Derive the inductance per phase
Work from input and output voltage, switching frequency, phase count and the ripple you can accept. More phases and higher frequency both reduce the inductance each phase needs.
- 02
Size on hot saturation current
Use the saturation figure at 100 degrees, not the 25 degree number. Your per-phase peak, including load transients, has to stay inside it.
- 03
Check heating current and DCR
Heating current caps the continuous RMS per phase. Multiply DC resistance by that current squared to see the copper loss the board has to shed.
- 04
Confirm layout and verify
Check body size, land pattern and phase-to-phase spacing, then measure ripple, current sharing and temperature rise on the real board.
Parameters
Reading power bead inductor ratings
Two saturation figures and a heating current, each defined under different conditions.
Tolerance
Stated as a percentage around the initial inductance. It feeds directly into your ripple calculation, so use the worst-case corner rather than the nominal value.
DC resistance
Sub-milliohm across the range, from about 0.18 to 0.47 milliohm depending on series. At high phase current even a tenth of a milliohm is measurable heat.
Saturation current at 25°C
The room-temperature limit, useful for comparing parts but optimistic for design. A real converter runs hotter than its test bench.
Saturation current at 100°C
The figure to design against. Saturation capability falls as the core heats, so this is what your peak phase current must stay below.
Heating current
The continuous RMS current that produces the datasheet's stated temperature rise. It caps steady-state load, while saturation caps the peak.
Compare
WHPBU series side by side
DC resistance and heating current separate the series more than inductance does.
Return to the selector ↑| category | Parts | Initial Inductance (nH) | Tolerance (±%) | DCR(mΩ) | 1-Saturation Current@25℃ (Amps)(typ) | 2-Saturation Current@100℃(Amps)(typ) | Heating Current(Amps)(typ) | Action |
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| WHPBU-100705N | 7 | 72, 100, 120, 150, 200, 220, 300 | 15 | 0.325±7% | 19, 30, 33, 45, 65, 70, 80 | 12, 24, 25, 35, 50, 60, 70 | 31 | Filter → |
| WHPBU-100710N | 8 | 100, 120, 150, 180, 220, 300, 330, 470 | 15, 20 | 0.18±10% | 20, 35, 43, 60, 75, 90, 117 | 15, 30, 33, 50, 65, 75, 80, 100 | 70 | Filter → |
| WHPBU-131308N | 6 | 110, 210, 260, 320, 440, 500 | 10, 15 | 0.32 ± 9.4% | 28, 35, 50, 60, 70, 120 | 23, 25, 35, 45, 55, 105 | 45 | Filter → |
| WHPBU-150705N | 3 | 100, 120, 150 | 15 | 0.47±7% | 72, 87, 105 | 60, 75, 80 | 53 | Filter → |
Application review
Where power bead inductors are used
Confirm phase count, per-phase current, switching frequency and the thermal environment.
CPU and GPU core rails
- Confirm phase count and per-phase peak current including transients, then verify current sharing and temperature rise across all phases.
Server and datacentre power stages
- Airflow is usually available but ambient is high. Derate the heating current for the real inlet temperature, not for 25 degrees.
FPGA and ASIC supply rails
- Fast load steps dominate. Check the hot saturation figure against the transient peak, not just the steady-state current.
Point-of-load converters
- Single-phase POL stages still benefit from low DCR. Confirm the inductance suits the switching frequency and the ripple budget.
Documents
Power bead inductor datasheets
Datasheets carry the saturation curves, heating current and recommended land pattern.
Showing representative available file sets. Search to find a specific SKU.
WHPBU-150705N-R15L0WHPBU-150705N
WHPBU-150705N-R12L0WHPBU-150705N
WHPBU-150705N-R10L0WHPBU-150705N
WHPBU-131308N-R50L0WHPBU-131308N
WHPBU-131308N-R44L0WHPBU-131308N
WHPBU-131308N-R32L0WHPBU-131308N
- 24
- PDF datasheets listed
- 0
- 3D file sets listed
- 0
- PCB footprints listed
VOOHU’s published product content is reviewed by its engineering team. Specifications, downloads and technical support information are tied to specific part numbers, so you can verify them before requesting samples or a quotation.
Category overview
What a power bead inductor is and how to rate one
These parts are often mislabelled. Knowing what they are, and which of the three current figures to design against, prevents most of the errors.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Single winding, not coupled
A power bead inductor is a single winding of one or two turns over a ferrite core. It is not a coupled inductor and not a common mode choke, both of which have two windings that interact magnetically. The construction gives very low DC resistance and very high saturation current in a small body.
Three current figures, three jobs
Saturation at 25 degrees is a comparison number. Saturation at 100 degrees is the one your peak phase current must stay under, because the core loses capability as it heats. Heating current is the continuous RMS that produces the rated temperature rise. Size the peak on the hot figure, the steady state on heating current.
Why DC resistance dominates here
With phase currents in the tens of amps, loss rises with the square of current. A part at 0.18 milliohm and one at 0.47 milliohm differ by more than a factor of two in copper loss. On a dense multiphase board that shows up directly as board temperature, so read DCR early rather than last.
FAQ
Power bead inductor questions engineers ask
Answers cover what a power bead is, which current rating to design against and how to compare.
What is a power bead inductor?
It is a single-winding power inductor, usually one or two turns over a ferrite core, designed for very low DC resistance and very high saturation current in a small body. It is the standard choice for multiphase buck converters powering processors, FPGAs and ASICs, where each phase carries tens of amps at low inductance.
Is this the same as a coupled inductor?
No. A coupled inductor has two or more windings that interact magnetically and is used to shape ripple across phases. A power bead is a single winding with no magnetic coupling between phases. The two are not interchangeable, and the datasheets describe different things, so do not substitute one for the other.
Which saturation current should I design against?
The figure at 100 degrees. Saturation capability falls as the core heats, and a working converter runs well above room temperature. The 25 degree number is useful for comparing parts on equal terms, but sizing a design against it leaves no margin once the board is hot.
What is heating current and how is it different?
Heating current is the continuous RMS current that produces the temperature rise stated in the datasheet. It caps the steady-state load each phase can carry. Saturation current caps the instantaneous peak. Both have to be satisfied: heating current for the average, hot saturation for the transient.
Why does DC resistance matter so much here?
Because loss rises with the square of current, and phase currents here are tens of amps. Across the WHPBU range DC resistance runs from about 0.18 to 0.47 milliohm, which is more than a factor of two in copper loss at the same current. On a dense board that shows up directly as temperature.
How do I choose the inductance value?
Work from input and output voltage, switching frequency, phase count and the ripple current you can accept. More phases and higher switching frequency both reduce the inductance each phase needs, which is why these parts are specified in nanohenries rather than microhenries.
Can I mix different series across phases?
It is not advisable. Phases should be as identical as possible, because differences in inductance and DC resistance cause unequal current sharing, and the phase carrying the most current runs hottest and saturates first. Use the same part across all phases and verify the sharing by measurement.
How do I request power bead inductor samples or a quote?
With a complete part number, send the part number, quantity, delivery region and the date you need it. If you are still selecting, send the total output current, phase count, per-phase RMS and peak current, switching frequency and ambient temperature.
Engineer support
Continue after product selection
Send the candidate part number and the condition you need reviewed. Sample support can be added after the selection is clear; commercial questions may be discussed in the same engineering conversation.
- 1Selected part numbers
- 2Engineering review
- 3Sample request
- 4Commercial discussion
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