Choose the impedance grade
Start from the frequency where your scan fails. Low grades such as WHLC-2012A-750C and WHLC-2012A-900T0 suit fast pairs; high grades such as WHLC-2012A-122T0 suppress more noise but narrow the signal bandwidth.
Inductor products
WH2012 Signal Line Common Mode Chokes
WH2012 is a compact part for differential pairs where board space between the traces is limited. Compare the impedance at the frequency your scan fails, then verify the eye diagram and return loss on your own link before committing.
Part number search & selector
Find WH2012 Signal Line Common Mode Chokes part numbers
Filter WH2012 signal line common mode chokes by size, impedance, inductance, DC resistance, leakage inductance, isolation resistance, rated current and rated voltage.
* Frozen Image and Part Number columns · drag horizontally to review all specifications
| Image | Datasheet | Compare | Downloads |
Size
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Common Mode Impedance (10MHZ) ΩMin
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Common Mode Impedance (Ωtyp)
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Inductance (uH) +50/–30%
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RDC (Ω)Max
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Leakage Inductance (nH) typ
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Isolation Resistance (MΩ) Min
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Rated Current Max
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Rated Voltage (V) Max
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| Image | Part number | Datasheet | Compare | Downloads | Size | Common Mode Impedance (10MHZ) ΩMin | Common Mode Impedance (Ωtyp) | Inductance (uH) +50/–30% | RDC (Ω)Max | Leakage Inductance (nH) typ | Isolation Resistance (MΩ) Min | Rated Current Max | Rated Voltage (V) Max | Sample |
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WHLC-2012A-121T1 | SPEC | 2012 | - | 120 | - | 0.3 | - | 10 | 400mA | 125 |
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WHLC-2012A-381T0 | SPEC | 2012 | - | 380 | - | 0.45 | - | 10 | 300mA | 50 |
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WHLC-2012A-900T0 | SPEC | 2012 | - | 90 | - | 0.35 | - | 10 | 300mA | 50 |
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WHLC-2012A-181T0 | SPEC | 2012 | - | 180 | - | 0.35 | - | 10 | 300mA | 50 |
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WHLC-2012A-261T0 | SPEC | 2012 | - | 260 | - | 0.4 | - | 10 | 300mA | 50 |
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WHLC-2012A-361T1 | SPEC | 2012 | - | 360 | - | 0.45 | - | 10 | 300mA | 50 |
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WHLC-2012A-801T0 | SPEC | 2012 | - | 800 | - | 0.88 | - | 10 | 300mA | 50 |
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WHLC-2012A-102T0 | SPEC | 2012 | - | 1000 | - | 1.3 | - | 10 | 300mA | 50 |
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WHLC-2012A-122T0 | SPEC | 2012 | - | 1200 | - | 1.5 | - | 10 | 300mA | 50 |
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WHLC-2012A-750C | SPEC | 2012 | - | 75 | - | 0.55 | - | 10 | 280mA | 50 |
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WHAC-2012A-801T0 | SPEC | 2012 | - | 800 | - | 0.88 | - | 10 | 300mA | 50 |
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WHAC-2012A-900T0 | SPEC | 2012 | - | 90 | - | 0.35 | - | 10 | 300mA | 50 |
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WHLC-2012A-121T0 | SPEC | 2012 | - | 120 | - | 0.3 | - | 10 | 400mA | 50 |
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No matching part numbers
Broaden the selected filters or clear the current search.
By interface
Chokes by interface: USB, CAN, Ethernet, HDMI
The interface sets the data rate and therefore what the choke is allowed to do to the signal.
Series overview
Choosing a WH2012 signal line common mode choke
A WH2012 signal line common mode choke is a 2012-size chip, 0805 in inch terms, that sits on a differential pair near the connector and blocks common mode noise while the signal passes. It is also listed as a 2012 common mode choke, SMD common mode choke or common mode filter. This selector gathers WHLC part numbers, such as WHLC-2012A-181T0, and WHAC part numbers, such as WHAC-2012A-900T0; to browse one prefix, open the WHLC2012A chokes or the WHAC2012A chokes.
Mixed prefixes in one table
The WH2012 selector lists WHLC and WHAC part numbers side by side. WHAC-2012A-801T0 and WHLC-2012A-801T0 share a grade code but have separate datasheets; compare them before one replaces the other.
Read the suffix
WHLC-2012A-121T0 and WHLC-2012A-121T1 differ only in the suffix, yet the selector lists different ratings for them. Quote the full part number, suffix included, on your drawings, BOMs and purchase orders.
When 2012 runs out
If no 2012 grade gives enough suppression, step up to the 3225-size WHAC3225B chokes or 4532-size WHAC4532A chokes. Both need more board area and wider trace spacing, so reserve room early.
Applications
Where WH2012 signal line common mode chokes fit
A 2012 body suits tight pairs with little room beside the connector.
USB 2.0 host and device ports
USB 2.0 cables pick up common mode noise, and the port is often where emissions escape. A low grade such as WHLC-2012A-900T0 beside the connector is a common first fit; check the eye diagram afterwards.
LVDS panel and camera links
Monitors, HMIs and video equipment run LVDS pairs over flex cables that radiate when common mode noise rides on them. Choose the grade from the failing band and data rate, then check eye opening.
Modules with little spare area
Small modules, handheld instruments and dense mainboards often have room for a 2012 chip where a 3225 body will not fit. Use the 3D model to check clearance before the layout is frozen.
Documents
WH2012 signal line common mode choke datasheets
Search by part number for the datasheet, 3D model and PCB footprint, then check terminal numbering and pad spacing before layout.
Showing representative available file sets. Search to find a specific SKU.
WHLC-2012A-121T12012
WHLC-2012A-381T02012
WHLC-2012A-900T02012
WHLC-2012A-181T02012
WHLC-2012A-261T02012
WHLC-2012A-361T12012
- 13
- PDF datasheets listed
- 13
- 3D file sets listed
- 13
- 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 WH2012 signal line common mode chokes
VOOHU manufactures its signal line chokes in its own magnetics factory in Mianyang. Each part number here has a datasheet, 3D model and PCB footprint for checking your layout before you order samples.
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. For a quote, send part numbers and quantities; typical lead time is 7–10 days.
Replacing another 2012 choke
Send the part number and datasheet of the choke you want to replace. Our FAE team compares impedance curve, DC resistance, rated current and footprint, then suggests WH2012 candidates to validate with samples before production.
Quality and company
VOOHU is ISO 9001 and ISO 14001 certified. Since 2018 VOOHU has supplied more than 1,500 customers, including 150+ listed companies. The 2012 chokes come from the same Mianyang factory that builds its LAN transformers.
FAQ
WH2012 signal line common mode choke questions
Supply, the first grade to try, and how this page differs from the CHIP LAN 2012 page.
What interfaces does WH2012 suit?
It suits differential pairs where space between the traces is tight. Whether it fits a specific interface depends on the impedance curve and how much insertion loss the link tolerates, so send the interface and data rate and our engineers will confirm rather than judging by package size alone.
How do I compare it with other parts in the 2012 band?
Read each candidate's common mode impedance at the frequency your emission scan fails, then compare DC resistance and the recommended land pattern. Shared package size means the footprints are similar; it says nothing about the impedance curve or the symmetry between windings.
Does DC resistance matter on a signal pair?
It adds loss in the signal path, and where the pair also carries bias current it causes a voltage drop and some heating. Read the maximum figure from the datasheet rather than a typical value, then judge it against the link budget your interface allows.
Will it affect my eye diagram?
Possibly. Real parts have some asymmetry and parasitic effects, which produce insertion loss and mode conversion, and both grow with data rate. Measure the eye and return loss on the target board with and without the part rather than relying on common mode impedance alone.
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 interface, the data rate and the frequency band where your scan fails, and a sales engineer will confirm candidates first.
Is VOOHU a WH2012 signal line common mode choke manufacturer?
Yes. VOOHU manufactures the WH2012 signal line common mode chokes in its own magnetics factory in Mianyang, China. That covers the WHLC and WHAC part numbers alike, so one quotation can include every 2012 grade you test.
Which WH2012 grade should I try first on a USB 2.0 pair?
Start low. A fast pair has little room for insertion loss, so WHLC-2012A-900T0 or WHAC-2012A-900T0 is the usual first fit. Move up a grade only if the scan still fails, re-measuring the eye each time.
How does this page differ from the 2012 CHIP LAN page?
The 2012 common mode chokes for CHIP LAN designs page covers WHLC2012A parts in Ethernet ports. This WH2012 page covers the same size for other differential pairs, such as USB 2.0 and LVDS links, plus the WHAC part numbers.
Engineer support
WH2012 signal line common mode choke samples
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
From the selector or engineering review
- Quantity and project stage
Prototyping / pilot build / production
- Required delivery date
Specify sample and production timing separately
- Required documentation
Compliance documents, material declarations or third-party reports
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
How to choose a USB 2.0 common mode choke
What is a common mode choke and how does it work?
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