Common mode impedance
The resistance the choke presents to common mode noise, quoted at a stated frequency. Compare candidates at the same frequency or the values do not correspond.
Induktivitätsprodukte
WHACM09A50R Common Mode Chokes
WHACM09A50R sits between the compact and larger WHACM bands, which often makes it the practical starting point when neither space nor current is severely constrained. Compare the impedance curve against the band your scan fails.
Artikelsuche und Produktauswahl
Artikelnummern für WHACM09A50R Common Mode Chokes finden
Die Tabelle verwendet die aktuellen Produktdatensätze der englischsprachigen Website, veröffentlichte Auswahlfelder und artikelspezifische Links zu technischen Dateien.
* Spalten „Bild“ und „Artikelnummer“ fixiert · horizontal ziehen, um alle Spezifikationen anzuzeigen
| Bild | Datenblatt | Vergleichen | Downloads |
Abmessungen (L×B×H, max.)
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Z (Ω) bei 100 MHz/0,1 V, min.
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Z (Ω) bei 100 MHz/0,1 V, Referenzwert
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Gleichstromwiderstand (mΩ), max.
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DC-Nennstrom (A), max.
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Isolationswiderstand (MΩ), min.
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Nennspannung (V), max.
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Muster |
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| Bild | Artikelnummer | Datenblatt | Vergleichen | Downloads | Abmessungen (L×B×H, max.) | Z (Ω) bei 100 MHz/0,1 V, min. | Z (Ω) bei 100 MHz/0,1 V, Referenzwert | Gleichstromwiderstand (mΩ), max. | DC-Nennstrom (A), max. | Isolationswiderstand (MΩ), min. | Nennspannung (V), max. | Muster |
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WHACM09A50R302 | SPEC | 9070 | 2500 | 3000 | 75 | 3 | 10 | 50 |
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WHACM09A50R222 | SPEC | 9070 | 1700 | 2200 | 60 | 2.5 | 10 | 50 |
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WHACM09A50R102 | SPEC | 9070 | 750 | 1000 | 13 | 4 | 10 | 50 |
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WHACM09A50R701 | SPEC | 9070 | 500 | 700 | 10 | 5 | 10 | 50 |
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WHACM09A50R601 | SPEC | 9070 | 450 | 600 | 8 | 5.5 | 10 | 50 |
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WHACM09A50R301 | SPEC | 9070 | 225 | 300 | 6 | 6 | 10 | 50 |
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Keine passenden Artikelnummern
Erweitern Sie die ausgewählten Filter oder löschen Sie die aktuelle Suche.
By series
Power line common mode choke families
Families differ in construction and size band, which sets impedance and current together.
01WHAL1211A-SerieArtikelnummern: 7
02WHPL1211A-SerieArtikelnummern: 7
03WHAL1513A-SerieArtikelnummern: 5
04WHAL4520A-SerieArtikelnummern: 14
05WHAL7060A-SerieArtikelnummern: 9
06WHAL9070A-SerieArtikelnummern: 6
07WHACM07A40R-SerieArtikelnummern: 9
08WHACM09A50R-SerieArtikelnummern: 6
09WHACM12A65R-SerieArtikelnummern: 7
10WHACM15A60R-SerieArtikelnummern: 5
So wählen Sie aus
Selecting a power line common mode choke in four steps
Work from the failing frequency band outward to current, losses and board space.
- 01
Identify the failing band
Read the frequency range where your conducted emission scan exceeds the limit. That band, not a general noise complaint, decides which impedance curve you need.
- 02
Match the impedance curve
Pick a part whose common mode impedance peaks across the failing band. Read the impedance at that frequency, not the headline figure at the family's peak.
- 03
Check current and DC resistance
The rated current must cover the worst-case load with margin. DC resistance sets the voltage drop and the heat the winding has to shed.
- 04
Confirm the mechanical fit
Check size, land pattern and clearance to neighbouring parts, then re-scan on your own board because layout changes the result.
Parameters
Reading common mode choke ratings
Impedance is a curve, not a single number, so read the test frequency with the value.
Nennstrom
The continuous current the winding carries under stated temperature-rise conditions. Derate for ambient temperature and restricted airflow inside the enclosure.
DC resistance
Winding resistance, usually a maximum figure. It sets the conduction loss and the voltage drop the supply has to tolerate at full load.
Common mode inductance
Measured with both windings in the common mode configuration. Higher inductance generally moves the impedance peak toward lower frequencies.
Leakage inductance
The part of the winding that does not couple. It acts on differential signals and can be useful, but it also limits how high a current the part handles.
Withstand voltage
Isolation between the two windings under a stated test. Select against the safety requirement that applies to the equipment, not the working voltage.
Vergleichen
Common mode choke families side by side
Size band drives impedance and current capability more than family naming does.
Zur Produktauswahl zurückkehren ↑| Abmessungen (L×B×H, max.) | Artikelnummern | Z (Ω) bei 100 MHz/0,1 V, min. | Z (Ω) bei 100 MHz/0,1 V, Referenzwert | Gleichstromwiderstand (mΩ), max. | DC-Nennstrom (A), max. | Isolationswiderstand (MΩ), min. | Nennspannung (V), max. | Aktion |
|---|---|---|---|---|---|---|---|---|
| 1211 | 7 | 80, 500, 600, 750, 2200, 2300 | 230, 700, 800, 1000, 2500, 2700 | 2, 4, 6, 8, 14, 35, 50 | 1.5, 1.8, 6, 8, 10 | 10 | 125 | Filtern → |
| 1513 | 5 | 225, 400, 500, 800, 1200 | 300, 500, 700, 1000, 1500 | 5, 6, 7, 10, 23 | 5, 9, 10, 13 | 10 | 80 | Filtern → |
| 4520 | 14 | 60, 90, 180, 200, 250, 300, 350, 500, 650, 800, 1000, 1200, 1800, 2500 | 90, 150, 230, 300, 380, 420, 500, 700, 900, 1000, 1200, 1400, 2000, 3000 | 35, 40, 45, 50, 55, 58, 60, 70, 80 | 1, 1.5, 1.9, 2.0, 2.1, 2.2, 2.4, 2.5, 3, 3.2 | 10 | 50 | Filtern → |
| 7060 | 9 | 40, 100, 225, 275, 500, 800, 910, 2000, 2500 | 70, 140, 300, 450, 700, 1020, 1300, 2700, 3000 | 5, 10, 15, 17, 21, 63, 75 | 0.9, 1, 2.5, 3, 4, 5, 9, 15 | 10 | 125 | Filtern → |
| 9070 | 6 | 225, 450, 500, 750, 1700, 2500 | 300, 600, 700, 1000, 2200, 3000 | 6, 8, 10, 13, 60, 75 | 2.5, 3, 4, 5, 5.5, 6 | 10 | 50 | Filtern → |
Anwendungsprüfung
Where power line common mode chokes are fitted
Confirm the line current, the failing band and how much board space the filter can take.
AC mains input filtering
- Confirm the line current and the failing band from the conducted scan, then verify the withstand voltage meets the equipment safety case.
DC power distribution
- Check the rated current against the worst-case load and confirm DC resistance does not push the rail below tolerance at full draw.
Motor drives and inverters
- Switching noise is broadband. Verify the impedance curve covers the whole failing range, not just the fundamental switching frequency.
Industrial power supplies
- Space and temperature rise usually decide. Confirm the derated current at the real ambient inside the enclosure.
Documents
Common mode choke datasheets and drawings
Datasheets carry the impedance curve, current rating and recommended land pattern.
Es werden repräsentative verfügbare Dateisätze angezeigt. Suchen Sie nach einer bestimmten Artikelnummer.
- 6
- Aufgeführte PDF-Datenblätter
- 0
- Aufgeführte 3D-Dateisätze
- 0
- Aufgeführte PCB-Footprints
Die veröffentlichten Produktinhalte von VOOHU werden vom technischen Team geprüft. Spezifikationen, Downloads und Informationen zum technischen Support sind bestimmten Artikelnummern zugeordnet, sodass Sie sie vor einer Muster- oder Angebotsanfrage prüfen können.
Kategorieübersicht
How a common mode choke works and how to choose one
Most selection mistakes here come from treating impedance as a single number, or from confusing common mode with differential mode noise.
Neues Design besprechen
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Common mode versus differential mode
Differential noise travels out on one conductor and back on the other. Common mode noise travels the same direction on both and returns through ground. A choke winds both conductors on one core so their supply currents cancel, while common mode current sees a high impedance. That is why it filters one and passes the other.
Impedance is a curve
The headline impedance figure is measured at one frequency. What matters is whether the curve is high across the band where your conducted emission scan actually fails. A part with a higher peak in the wrong place will not help. Read the curve from the datasheet, identify your failing band first, and match the two.
What limits the choice
Rated current and DC resistance set the ceiling. A choke with excellent impedance is useless if the winding cannot carry the load current, or if its resistance drops the rail below tolerance. Check those against worst case, then confirm on your own board, because layout and the rest of the filter change the measured result.
FAQ
Common mode choke questions engineers ask
Answers cover how the choke works, how to read impedance and where it belongs.
Why start evaluation in the middle of a range?
Because it usually leaves room to move either way. If the mid band part covers your failing frequency and carries the current with margin, you are done. If impedance falls short you step up; if board space is the binding constraint you step down and re-check the current.
How much margin should I leave on rated current?
Enough to cover the worst-case continuous load, the highest ambient temperature the product sees, and any restriction on airflow inside the enclosure. The datasheet figure is defined under stated conditions, and a sealed box at elevated ambient is rarely those conditions.
Can I compare WHACM parts by size code alone?
Use the size code as a first filter only. Two parts in adjacent bands may differ in turns, wire gauge and core material, which changes impedance, current and DC resistance in ways the size code does not express. Read the datasheets before shortlisting.
What if the impedance is right but the current is not?
Move up the range and re-check the impedance at your frequency, because a larger core usually shifts the peak lower. If the failing band is high, you may need a different construction rather than simply a bigger part. Send the conditions to our engineers.
How do I request 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 line current, the frequency band where your scan fails and the board space available, and a sales engineer will confirm candidates first.
Technischer Support
Nach der Produktauswahl fortfahren
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