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Part Datasheet Audit
Audit scope
Part project reviewed against the official Würth Elektronik datasheet for MPN 750032052.
  • Official datasheet: https://www.we-online.com/components/products/datasheet/750032052.pdf
  • Existing Datasheet URL property: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/feb061d521e6d9c3d1ace1356588a3afe683425e5392b6fd7e16c5e04a31edff.pdf
  • The Datasheet URL property was already populated, so it was not changed.
Existing part information

Table

FieldCurrent valueReview
Manufacturer Part Number750032052Matches official order code
Manufacturer NameWürthCorrect but abbreviated; datasheet identifies Würth Elektronik / Würth Elektronik Midcom
Part TypeTransformersCorrect, though “Flyback Transformer” would be more specific
Designator PrefixLPresent; transformer prefixes are commonly T, but this is a library convention rather than a datasheet mismatch
DescriptionWE-FB 3751 Flyback Transformer for LT3751Matches current official datasheet title
Package / sizeEFD20Matches datasheet
Pin/pad count10Matches physical package; six pins are winding connections and four are N.C.
Footprint asset750032052.kicad_modPresent
3D model asset750032052.stpPresent
Symbol asset750032052 Symbol.svgPresent
Key official specifications

Table

ParameterOfficial value
Primary inductance, N110 µH ±10%, measured at 10 kHz / 100 mV
Turns ratio, N1:N21:10
Saturation current, N110 A typical at
N1 DC resistance0.02 Ω maximum at 20 °C
N2 DC resistance1.06 Ω maximum at 20 °C
Leakage inductance, referred to N10.3 µH maximum at 100 kHz / 10 mA
Insulation test voltage1000 VAC, N1 to N2
Operating temperature-40 °C to +125 °C
Moisture sensitivity levelMSL 1
PackageEFD20, SMD
Maximum body dimensions28.7 mm × 21.97 mm × 11.43 mm
Product marking32052, with pin-1 dot
Official winding and pin mapping
The datasheet schematic defines:

Table

Pin(s)Datasheet functionPolarity
1N1 endDotted end
4, 5N1 opposite endUndotted end
10N2 endDotted end
6, 7N2 opposite endUndotted end
2, 3, 8, 9N.C.No electrical connection
Schematic symbol cross-check
Current symbol terminals:

Table

PinCurrent labelExpected label/functionResult
1N2+N1 dotted end, e.g. N1+Mismatch
2N.C.N.C.Match
3N.C.N.C.Match
4N1-N1 undotted endMatch
5N1-N1 undotted endMatch
6N1+N2 undotted end, e.g. N2-Mismatch
7N1+N2 undotted end, e.g. N2-Mismatch
8N.C.N.C.Match
9N.C.N.C.Match
10N2-N2 dotted end, e.g. N2+Polarity mismatch
Symbol findings
  1. Primary and secondary winding names are mixed. Pins 1/4/5 must all belong to N1, while pins 10/6/7 must all belong to N2.
  2. Dot polarity is inconsistent. If + denotes the dotted end, pin 1 should be N1+ and pin 10 should be N2+; pins 4/5 should be N1-, and pins 6/7 should be N2-.
  3. Pin descriptions are missing. Every terminal currently has Pin Type Unspecified, with no Pin Description, Pin Group, Section, orientation, or terminal-order metadata.
  4. N.C. pins are correctly identified by number, but should have explicit descriptions such as “No internal connection; leave electrically unconnected.”
Footprint cross-check
The official recommended land pattern specifies:
  • Two pad columns separated by 22.66 mm center-to-center
  • 3.75 mm vertical pitch
  • Pads 2.92 mm × 1.52 mm
  • Left column pins 1 through 5; right column pins 6 through 10
The current footprint’s computed pad geometry corresponds to:
  • X positions approximately ±11.33 mm, giving 22.66 mm column spacing
  • Y positions ±7.50, ±3.75, and 0 mm, giving 3.75 mm pitch
  • Pad size 2.92 mm × 1.52 mm after the applied 90° rotation
  • Ten rectangular SMD pads in the correct two-column sequence
Result: The copper pad geometry and pin count match the datasheet-recommended land pattern. No pad-position or pad-size mismatch was found.
Footprint limitations / items not fully verified
  • The available computed layout data did not expose detailed solder-mask expansion, paste-mask apertures, courtyard, fabrication outline, or silkscreen primitives from the imported .kicad_mod; these were not independently confirmed.
  • The 3D STEP model is present and rotated 90°, but exact body-to-pad alignment and body dimensions were not numerically exposed for a full model fit check.
  1. Rename symbol terminals to align with the official winding mapping:
    • Pin 1 → N1+
    • Pins 4, 5 → N1-
    • Pin 10 → N2+
    • Pins 6, 7 → N2-
  2. Add explicit Pin Descriptions for all ten terminals.
  3. Assign winding-based Pin Groups/Sections (Primary, Secondary, No Connect) and meaningful pin types; keep N.C. pins explicitly marked.
  4. Optionally replace the stored uploaded-copy Datasheet URL with the canonical official Würth URL for long-term traceability, although the existing property was not missing and therefore was left unchanged in this audit.
  5. Visually inspect the footprint silkscreen pin-1 marker and STEP model alignment before publishing or manufacturing.
Overall assessment
  • Metadata: Mostly correct; manufacturer naming is abbreviated and the datasheet property points to an uploaded copy rather than the canonical manufacturer URL.
  • Symbol: Not correct for use as-is because the primary/secondary winding labels and dot polarity do not match the datasheet pin mapping.
  • Footprint: Copper land pattern matches the official dimensions and pin arrangement based on the exposed geometry.
  • Pin descriptions: Incomplete; all terminals lack descriptive/function metadata and are typed as Unspecified.

  • Audit scope

  • Existing part information

  • Key official specifications

  • Official winding and pin mapping

  • Schematic symbol cross-check

  • Symbol findings

  • Footprint cross-check

  • Footprint limitations / items not fully verified

  • Recommended corrections

  • Overall assessment