Part Metadata Review and Update

flux

2:15

Evaluating project data.

Reviewing the bill of materials.

Analyzing the schematic.

Analyzing the PCB layout.

Looking for "Extract the key specs: manufacturer, exact MPN, product description, inductance, rated current, DC resistance, isolation or rated voltage if listed, operating/storage temperature, dimensions, package style, and any package/case code." in 744821039.pdf

Looking for "Extract the complete pin information: all terminal numbers, winding names, start/finish or polarity/dot marking, and how the four pins map to the two common-mode choke windings." in 744821039.pdf

Looking for "Extract the package drawing and PCB footprint details: body length/width/height, pin pitch, recommended land pattern if present, and any mechanical drawing notes relevant to footprint verification." in 744821039.pdf

Looking for "Explain the symbol and pin mapping conventions shown in the datasheet, including which pins should be paired as one winding and which terminals are the dotted ends if specified." in 744821039.pdf

Searching the project.

Analyzing the PCB layout.

Searching project properties.

Searching 4 domains.

Searching for PCB details.

Searching 2 domains.

Searching for asset details.

Searching pcb.

Fetching datasheet information.

Searching fetch_url.

Looking for "recommended PCB layout footprint dimensions pin spacing hole drill pad diameter 744821039 WE-CMB XS5" in 744821039.pdf

Searching for project properties.

Searching 2 domains.

Clarifying project requirements.

Search complete — 143 results across 5 domains.

Addressing citation requirements.

Summarizing the specs.

I reviewed the part project against the official Würth datasheet and the current project data.
Result
  • Datasheet property: already set to the official Würth PDF, so no update was needed.
  • Pin count: matches the datasheet: 4 terminals. The sync workflow for part projects is to use the datasheet as the source of truth and ensure the terminal count matches exactly
  • Main issues found: missing package metadata, incomplete terminal metadata, and likely symbol labeling mismatch.
Current project metadata vs datasheet

Part metadata audit

FieldIn projectIn datasheetStatus
Manufacturer Part Number744821039744821039OK
Manufacturer NameWürthWürth Elektronik eiSos GmbH & Co. KGAcceptable, but could be made more exact
Part TypeInductorsCommon mode power line chokeAcceptable
Designator PrefixLInductor/choke familyOK
Datasheet URLOfficial Würth PDF already setSameOK
Package / Case CodeMissingXS, through-hole 4-pinMismatch / missing
DescriptionWE-CMB Common Mode Power Line Choke Size Typ XS; L = 39 mH; IR = 0.3 A; RDC = 3000 mWE-CMB Common Mode Power Line Choke, size XS, 39 mH, 0.3 A, 3000 mΩNeeds cleanup
Key specs from the datasheet

Datasheet summary

ParameterValue
SeriesWE-CMB
Exact MPN744821039
ManufacturerWürth Elektronik eiSos GmbH & Co. KG
Part typeCommon mode power line choke
Size / caseXS
MountingThrough-hole
Windings2
Terminal count4
Inductance39 mH ±30% @ 10 kHz / 0.1 mA
Rated current0.3 A max
DC resistance3000 mΩ max @ 20 °C
Rated voltage250 V AC max @ 50 Hz
Insulation test voltage1500 V AC @ 50 Hz / 5 mA / 2 s
Ambient temp at rated current-40 to +70 °C
Operating temperature-40 to +125 °C
Pin and symbol cross-check
The datasheet shows two windings:
  • Winding 1: pins 1-2
  • Winding 2: pins 4-3
It also shows the physical pin layout as:
  • top row: 4, 2
  • bottom row: 3, 1

Pin audit

Datasheet pin pairingProject terminalProject Pin Number propertyStatus
Pin 131OK
Pin 242OK
Pin 323OK
Pin 414OK
Mismatches and concerns

Flagged issues

AreaFindingSeverity
Terminal metadataAll four terminals have Pin Type = UnspecifiedMedium
Terminal labelsSchematic designators are just 1, 2, 3, 4 instead of functional terminal namingLow
Pin descriptionsNo pin descriptions presentMedium
Package metadataPackage or Case Code is missing; datasheet says XSMedium
Description textRDC = 3000 m appears truncated; should be 3000 mΩ or 3.0 Ω equivalentLow
Manufacturer name precisionProject says Würth; datasheet gives full manufacturer nameLow
For a simple passive magnetic like this one, the part-project sync guidance says not to invent pin data, and to ensure exact pin-number matching from the datasheet before assigning any metadata
Symbol assessment
  • The pin numbering is consistent with the datasheet.
  • The winding pairing is not captured explicitly in the current symbol metadata.
  • The datasheet does not explicitly expose polarity dots in the extracted text, so I would not assign dot/start-finish semantics unless you want me to verify from the graphical figure manually.
  • Because all terminals are generic and unnamed, the symbol is technically usable but not very descriptive.
Footprint assessment
From the project index:
  • Footprint asset: WE-CMB_XS5.kicad_mod
  • 3D model asset: 744821039.stp
  • Pad count: 4
From the datasheet:
  • Recommended hole pattern: 10.0 mm x 4.5 mm
  • Hole diameter: Ø1.1 mm
So the high-level footprint check looks consistent:
  • 4 pads present
  • Pin numbering 1-4 present
  • Footprint family naming aligns with the part size
What I could not fully verify from the currently exposed project data is:
  • exact pad copper diameter
  • exact pad shape
  • exact XY pad coordinates
So I can say the footprint appears plausibly matched, but not fully dimension-verified down to pad geometry.
Overall verdict

Summary

CategoryVerdict
MPNOK
Datasheet URLOK
Pin countOK
Pin numberingOK
Winding pairingDatasheet known, not clearly expressed in symbol metadata
Footprint family matchLikely OK
Footprint exact geometryPartially verified only
Part metadata completenessIncomplete
Symbol metadata completenessIncomplete
Recommended fixes
  • Add Package or Case Code = XS
  • Normalize manufacturer name to the full datasheet name
  • Fix the description text so resistance is clearly 3000 mΩ
  • Add terminal descriptions such as:
    • 3: Winding 1 terminal
    • 4: Winding 1 terminal
    • 1: Winding 2 terminal
    • 2: Winding 2 terminal
  • Optionally rename the terminals to make the winding pairs clearer
If you want, I can make those metadata fixes in the part project next.
Fix part metadata
Verify footprint dimensions
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744821039

744821039 thumbnail
39 mH @ 10 kHz 2 Line Common Mode Choke Through Hole 300mA DCR The 744821039 is a common mode choke (CMC) designed for power line filtering. It is used to suppress electromagnetic interference (EMI), particularly common-mode noise in AC/DC power circuits and switching power supplies. Type: Common mode choke (power line filter) Inductance: 39 mH @ 10 kHz Rated current: 300 mA Number of lines: 2-line configuration Mounting: Through-hole (radial/vertical, 4 pins) AC voltage rating: up to 250 V DC resistance: ~3 Ω max Operating temperature: −40°C to +125°C Blocks high-frequency noise on power lines Allows normal differential current (useful signal) to pass Improves EMC compliance of electronic systems Reduces radio interference (RFI) in circuits AC/DC power supply input filters Switch-mode power supplies (SMPS) Industrial electronics and motor drives Household appliances and embedded systems Devices without proper grounding (noise suppression) #CommonPartsLibrary #Inductor #WE-CMB

Properties

744821039

Würth

Inductors

we-online.com/catalog/datasheet/744821039.pdf

L

39m

H

creativecommons.org/licenses/by/4.0/

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