High impedance, light load
WHACM07A40R302 lists 3000 Ω reference and 2500 Ω minimum impedance at 100 MHz, with 75 mΩ maximum DCR and a 0.9 A rating. WHACM07A40R272 gives 2700 Ω reference at 100 MHz at 1 A.
Inductor products
WHACM07A40R Common Mode Chokes
WHACM07A40R is the compact end of the WHACM range, for boards where the filter stage has very little room. Read the impedance at your failing frequency rather than the peak, and confirm the rated current leaves margin at your ambient.
Part number search & selector
Find WHACM07A40R Common Mode Chokes part numbers
Filter WHACM07A40R common mode chokes by size, impedance at 100 MHz, DCR, rated current, insulation resistance and rated voltage.
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| Image | Part number | Datasheet | Compare | Downloads | Dimensions(L*W*H MAX) | Z(Ω) 100MHz/0.1V Min. | Z(Ω) 100MHz/0.1V Ref. | DC Resistance (mΩ) Max. | Rated DC Current (A)Max. | Insulation Resistance (MΩ)Min. | Rated Voltage (V)Max. | Sample |
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WHACM07A40R302 | SPEC | 7060 | 2500 | 3000 | 75 | 0.9 | 10 | 125 |
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WHACM07A40R272 | SPEC | 7060 | 2000 | 2700 | 63 | 1 | 10 | 125 |
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WHACM07A40R132 | SPEC | 7060 | 910 | 1300 | 21 | 2.5 | 10 | 125 |
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WHACM07A40R102 | SPEC | 7060 | 800 | 1020 | 17 | 3 | 10 | 125 |
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WHACM07A40R501 | SPEC | 7060 | 275 | 450 | 10 | 5 | 10 | 125 |
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WHACM07A40R301 | SPEC | 7060 | 225 | 300 | 10 | 5 | 10 | 125 |
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WHACM07A40R400 | SPEC | 7060 | 40 | 70 | 5 | 15 | 10 | 125 |
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WHACM07A40R101 | SPEC | 7060 | 100 | 140 | 10 | 9 | 10 | 125 |
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By series
Power line common mode choke families
Families differ in construction and size band, which sets impedance and current together.
01WHAL1211A SeriesPart numbers: 7
02WHPL1211A SERIESPart numbers: 7
03WHAL1513A SeriesPart numbers: 5
04WHAL4520A SeriesPart numbers: 14
05WHAL7060A SeriesPart numbers: 8
06WHAL9070A SeriesPart numbers: 6
07WHACM07A40R SeriesPart numbers: 8
08WHACM09A50R SeriesPart numbers: 6
09WHACM12A65R SeriesPart numbers: 7
10WHACM15A60R SeriesPart numbers: 5
Series overview
Choosing a WHACM07A40R common mode choke
A WHACM07A40R common mode choke, also called a common mode inductor or CMC, is a 7060-size power line choke for the EMI filter at a DC input. All parts are rated 125 V with 10 MΩ minimum insulation resistance, and current ratings run from 0.9 A on the high-impedance end to 15 A on the low-impedance end. For less board area, see WHAL4520A common mode chokes; for higher impedance at 6–10 A, see WHACM12A65R.
The middle of the ladder
WHACM07A40R132 gives 1300 Ω reference impedance at 100 MHz with 21 mΩ DCR and a 2.5 A rating. WHACM07A40R102 trades a little impedance, 1020 Ω at 100 MHz, for 17 mΩ and 3 A.
Same current, more impedance
WHACM07A40R501 and WHACM07A40R301 are both rated 5 A with 10 mΩ maximum DCR, but WHACM07A40R501 lists 450 Ω reference impedance at 100 MHz against 300 Ω, adding attenuation at no extra DCR.
Low impedance, high current
WHACM07A40R101 carries 9 A with 140 Ω reference impedance at 100 MHz. WHACM07A40R400 is the high current common mode choke of the series: 15 A, 5 mΩ maximum DCR and 70 Ω reference at 100 MHz.
Applications
Where WHACM07A40R common mode chokes fit
One body size, a 125 V rating and 0.9–15 A cover very different DC inputs.
Router and access point inputs
On a 12 V router or access point input, WHACM07A40R102 at 3 A or WHACM07A40R132 at 2.5 A sits between the DC jack and the converter, with Y capacitors completing the common mode filter.
Controllers and remote I/O
PLCs and remote I/O on a 24 V bus pick up noise from long field wiring. A 5 A power line choke such as WHACM07A40R501 leaves headroom, and its 125 V rating sits far above the rail.
High-current DC inputs
When one input feeds a multi-port switch or an NVR, WHACM07A40R101 and WHACM07A40R400 keep conduction loss low at 9 A and 15 A. Check winding temperature at full load inside the enclosure.
Documents
WHACM07A40R common mode choke datasheets
Open each WHACM07A40R common mode choke datasheet by part number and confirm the impedance curve, DCR, current rating and outline before layout.
Showing representative available file sets. Search to find a specific SKU.
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- 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.
Sourcing
Sourcing WHACM07A40R common mode chokes from VOOHU
VOOHU is a common mode choke manufacturer with its own magnetics factory in Mianyang. Each part has a datasheet; 3D models and PCB footprints are not published, so take the land pattern from the drawing.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
Samples and quotations
Samples are available for evaluation, and selected parts are free of charge. Our FAE team will be glad to confirm the options for your project. Quotations need the part number, quantity and target date; typical lead time is 7–10 days.
Replacing another 7060 choke
Send the part number and datasheet of the 7060-size common mode choke you use now. Our FAE team compares impedance at 100 MHz, DCR, ratings and land pattern, then proposes WHACM07A40R candidates to validate with samples before production.
Quality and support
VOOHU is ISO 9001 and ISO 14001 certified. Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies. Its own FAE team supports the WHACM07A40R series from first design review to production.
FAQ
WHACM07A40R common mode choke questions
Who makes the series, which part suits a 5 A rail and how it compares with 9070.
How does WHACM differ from the WHAL range?
They are separate families with their own construction and specification, not two labels for the same parts. Impedance behaviour, current capability and footprint are each defined per datasheet. Compare the two on the parameters that matter to your design rather than assuming one supersedes the other.
What is the trade with a compact part?
Less winding window and less core volume, which generally means lower current capability and a different impedance curve. If your line current and failing band both fit inside what the compact part offers, the smaller footprint is a clear gain. If not, move up the range.
How do I compare candidates fairly?
Read each part's common mode impedance at the same frequency, specifically the frequency where your conducted emission scan fails. Then compare rated current under the same temperature-rise condition and maximum DC resistance. Comparing headline peaks across different test frequencies tells you very little.
Does a small choke saturate more easily?
Less core volume generally means less margin before the core approaches saturation, and once it does the impedance collapses and the filtering stops. Stay within the rated current including transients, and derate for the ambient temperature inside your enclosure.
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.
Is VOOHU a WHACM07A40R common mode choke manufacturer?
Yes. VOOHU manufactures the WHACM07A40R common mode chokes in its own magnetics factory in Mianyang, China. All share the 7060 size, a 125 V rating and 10 MΩ minimum insulation resistance, so the columns that separate them are impedance, DCR and current.
Which WHACM07A40R common mode choke suits a 5 A rail?
WHACM07A40R501 and WHACM07A40R301 are rated exactly 5 A, which leaves no margin. WHACM07A40R101 is the next step, rated 9 A with 140 Ω reference impedance at 100 MHz; WHACM07A40R400 carries 15 A but only 70 Ω reference at 100 MHz.
How does WHACM07A40R compare with WHACM09A50R?
The WHACM09A50R common mode chokes use the larger 9070 size, are rated 50 V and run from 2.5 A to 6 A. WHACM07A40R is smaller yet rated 125 V and reaches 15 A, so start here on a 48 V rail or above 6 A.
Engineer support
WHACM07A40R common mode choke samples and support
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
For a replacement review
- Original part and datasheet
Include the document revision
- Operating conditions
Temperature, isolation voltage and PoE current basis
- Package constraints
Pin count, pitch and spacing between pin rows
- Project stage and annual volume
To help prioritize samples and evaluation
- Target review date
When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
For samples and a quotation
- Candidate part numbers
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Prototyping / pilot build / production
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Specify sample and production timing separately
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Samples are free of charge. Sample quantity and lead time depend on the part number and project stage. Sales will respond on business days.
Related guides and reviews
Fixing conducted emissions at a DC power port
What is a common mode choke and how does it work?
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