Transformer products
Compare WHLC-2012A common mode chokes for common mode noise suppression in CHIP LAN circuits. The family datasheet lists typical common mode impedance options from 90 to 1200 Ω at 100 MHz. Review the target circuit and signal requirements before choosing impedance and package. Request samples or pricing directly if your part number is known.
Part number search & selector
Filter 2012 common mode chokes by size, classification, data rate, impedance and PoE label.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
| Image | Datasheet | Compare | Downloads |
Size
|
Classification
|
Data Rate
|
L(μH)
|
Impedance(Ω)
|
PoE
|
Sample |
|---|
| Image | Part number | Datasheet | Compare | Downloads | Size | Classification | Data Rate | L(μH) | Impedance(Ω) | PoE | Sample |
|---|---|---|---|---|---|---|---|---|---|---|---|
 |
WHLC-2012A-122T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 1200 | Non-PoE |
|
||
|
|
WHLC-2012A-102T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 1000 | Non-PoE |
|
||
|
|
WHLC-2012A-801T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 800 | Non-PoE |
|
||
|
|
WHLC-2012A-381T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 380 | Non-PoE |
|
||
|
|
WHLC-2012A-361T1 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 360 | Non-PoE |
|
||
|
|
WHLC-2012A-261T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 260 | Non-PoE |
|
||
|
|
WHLC-2012A-181T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 180 | Non-PoE |
|
||
|
|
WHLC-2012A-900T0 | SPEC | 2012(0805) | Cap+CMC | 100/1000 BASE-T | - | 90 | Non-PoE |
|
Broaden the selected filters or clear the current search.
Product family quick links
Counts reflect the current published product data.
Series overview
A 2012 common mode choke in a CHIP LAN design sits on the differential pairs of a capacitively coupled Ethernet port, where coupling capacitors replace the transformer. They are also called chip LAN common mode chokes or 0805 common mode chokes. All use the 2012 (0805 inch) body and are listed for non-PoE 100/1000BASE-T ports. For an isolated port, use a 3532A chip LAN transformer; for PoE, a 4532B PoE chip LAN transformer.
Lower- and higher-impedance options share the same 2012 body, from WHLC-2012A-900T0 at the low end to WHLC-2012A-122T0 at the high end. More impedance suppresses common mode noise harder but adds differential insertion loss.
Coupling capacitors block DC between the PHY and the cable, and the choke filters common mode noise. Nothing in this circuit gives magnetic isolation, so first confirm that your PHY reference design allows capacitive coupling.
Size, classification, data rate and PoE label are the same across the range, so filter on impedance first and shortlist neighboring steps to compare on the board.
The 2012 (0805 inch) SMD body suits standard pick-and-place and reflow. Keep each choke close to its coupling capacitors, route the pair symmetrically, and use the footprint file of the exact part number.
Applications
They suit Ethernet links that need no galvanic isolation and whose PHYs support capacitive coupling.
Links between boards in one enclosure, over a backplane or a short internal cable, can run capacitively coupled when both PHYs allow it. A mid-range part such as WHLC-2012A-361T1 is a sensible first candidate.
Where board area is tight and the port needs no isolation, 2012 (0805 inch) chokes in a Cap+CMC circuit can be used instead of a chip transformer, once the PHY reference circuit allows it.
In EMC pre-scans, engineers often try neighboring impedance steps side by side, such as WHLC-2012A-381T0 and WHLC-2012A-801T0. Keep the PHY settings unchanged between runs.
Downloads & technical resources
Search by part number for the datasheet, 3D model and PCB footprint, then read the impedance values, test frequency and land pattern before layout.
Showing representative available file sets. Search to find a specific SKU.
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
VOOHU manufactures these 2012 common mode chokes in its own magnetics factory in Mianyang. Every part number comes with a datasheet, a 3D model and a PCB footprint for your layout check.
Discuss a new design
Contact FAE for a replacement assessment.
Already have a part number? Request samples or a quote.
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. For a quotation, list the part numbers and quantity; typical lead time is 7–10 days.
If another supplier’s choke is already on your board, send its part number and datasheet. Our FAE team compares impedance, test frequency, DC resistance and footprint, then proposes VOOHU candidates to validate with samples before production.
VOOHU is ISO 9001 and ISO 14001 certified. Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies. Production stays in its Mianyang magnetics factory.
FAQ & related guides
Who makes these chokes, how to step through impedance, and how they compare with the 3216 range.
No. The WHLC-2012A datasheet identifies it as a common mode choke. A capacitively coupled circuit may need separate capacitors and other components. Check the complete BOM rather than treating a circuit name as the internal structure of one part.
No. They are typical common mode impedance options at 100 MHz. Selection also depends on frequency characteristics, DCR and the effect on the signal. Share the PHY and noise frequency range to identify a suitable part.
Do not use it alone as an Ethernet isolation transformer. The current catalog lists this family for non-PoE designs; it does not authorize PoE use. Isolation and power-delivery capability require a separate review of the complete circuit.
No. Check terminal numbering, recommended pads, spacing, tolerances and orientation. Use the datasheet and footprint for the same part. Do not substitute the footprint of a standard two-terminal 0805 resistor or capacitor.
Yes. Share the impedance and test frequency, PHY, application and quantity. Sales can involve FAE to review candidates. If the WHLC part number is already known, request pricing and samples directly.
Yes. VOOHU manufactures these 2012 common mode chokes in its own magnetics factory in Mianyang, China. The same factory builds the X’fmr+CMC chip LAN transformers listed under CHIP LAN, so both port styles come from one source.
Start in the middle of the impedance range listed in the selector, for example WHLC-2012A-361T1 or WHLC-2012A-381T0. If emissions still fail, step up toward WHLC-2012A-102T0; if eye margin is short, step down toward WHLC-2012A-181T0. Take values and test frequency from each datasheet and confirm on the target board.
Both are Cap+CMC parts with a non-PoE label. The 2012 range is specified by common mode impedance and listed for 100/1000BASE-T; the 3216 CHIP LAN components are specified by inductance instead and are also listed for 2.5G/5G BASE-T.
Engineer 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.
Include the document revision
Temperature, isolation voltage and PoE current basis
Pin count, pitch and spacing between pin rows
To help prioritize samples and evaluation
When you need candidates and a comparison of differences
Engineering review identifies candidate parts and explains the differences.
From the selector or engineering review
Prototyping / pilot build / production
Specify sample and production timing separately
Compliance documents, material declarations or third-party reports
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. Sales will respond on business days.
