Part Review and Datasheet Update

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Part review summary
I reviewed the current part project against the available project metadata and official Molex B8-series documentation for the 505551-2420 variant.
What I found Project metadata

Table

FieldCurrent valueReview
Manufacturer Part Number505551-2420Looks correct
Manufacturer NameMolexLooks correct
Part TypeConnectorsReasonable, though Connector would be a cleaner singular category
Package or Case CodeTOMismatch / likely incorrect
Designator PrefixJCorrect for a connector
Datasheet URLMolex product pagePresent, so I did not overwrite it
Key specs from official Molex material
From the official Molex B8 / 505550-505551 series documents and product-family information, this part is a:
  • Board-to-board / mezzanine plug connector
  • 24 circuits
  • 0.40 mm pitch
  • 0.80 mm mated height / series height
  • 0.3 A max current rating
  • 50 V max AC rms / DC
  • -40°C to +85°C ambient operating range
Symbol review Pin count
The schematic currently contains:
  • 24 numbered terminals: 1 through 24
  • 4 mounting-pad terminals: MP1 through MP4
So the symbol represents 28 total terminals/pads.
Cross-check result
  • The 24 contact positions are consistent with the 24-circuit part number.
  • The presence of 4 MP pads is consistent with a connector footprint that includes mounting / hold-down pads.
  • I did not find evidence of missing numbered contacts from the current symbol.
  • I also did not find any extra numbered signal pins beyond the expected 24.
Mismatch / weakness
  • All terminal components currently have Pin Type = Unspecified. That is incomplete for a finished part definition and should be filled in if you want better downstream ERC behavior and cleaner part metadata. The part-project sync workflow specifically calls out pin typing and property completion as required for a complete part definition and warns that missing pin typing degrades part quality .
  • I do not see any Pin Description properties on the terminals. The recommended workflow expects short pin descriptions where available from the datasheet or drawing set .
Footprint review What matches
  • The footprint contains pads for:
    • 1-24
    • MP1-MP4
  • That matches the symbol one-for-one by pad naming and count, which is a good sign.
  • I did not detect any obvious symbol-to-footprint naming mismatch.
What I could not fully verify
I could verify pad count and naming consistency, but I could not fully validate the exact land-pattern dimensions from the current tool output because the layout data available here exposes the pad identities, not the full measured pad geometry or pitch dimensions. So:
  • Symbol ↔ footprint pad mapping: looks consistent
  • Exact pad geometry vs Molex recommended land pattern: not fully verifiable from the current project data alone
Pin description / naming review Current state
  • Terminal designators are mostly raw pad names:
    • 1-24
    • MP1-MP4
  • That is acceptable for a connector part, since these are positional contacts rather than named functional pins.
Flagged issue
  • There are no descriptive per-pin properties visible, so the part is missing richer metadata such as short pin descriptions.
  • For a connector, that may be acceptable if the datasheet itself does not assign distinct electrical functions per contact, but it still means the part definition is fairly minimal.
Mismatches and flags

Table

AreaStatusNotes
MPNOK505551-2420 is consistent
ManufacturerOKMolex is correct
DescriptionMostly OKExisting description is understandable but could be more precise
Package / case codeFlagTO does not match this connector family and should be replaced
Datasheet URL presenceOKAlready set, so no change required
Datasheet URL qualityFlagIt points to a product page, not a canonical PDF datasheet/spec PDF
Pin countOK24 contacts + 4 MP pads present
Symbol ↔ footprint pad namesOKPad naming appears aligned
Pin typesFlagAll terminals are Unspecified
Pin descriptionsFlagNot populated
Exact footprint geometry vs datasheetNeeds manual check or richer source accessPad identities match, dimensions not fully validated here
Recommended metadata cleanup
I’d recommend these updates next:
  • Change Package or Case Code from TO to something aligned with the Molex series/package style
  • Replace the current datasheet link with the official Molex spec PDF rather than the product page
  • Set terminal Pin Type values explicitly
  • Optionally add short Pin Description values for the mounting pads vs contact pads
Bottom line
The part is structurally close:
  • The MPN, manufacturer, connector type, and 24 + 4 pad structure look consistent.
  • The symbol and footprint pad naming align.
  • The biggest issues are metadata quality, especially:
    • wrong Package or Case Code
    • non-canonical Datasheet URL
    • missing Pin Type
    • missing Pin Description
If you want, I can make the cleanup edits directly:
  1. update the project properties,
  2. set the datasheet property to the official Molex PDF,
  3. and populate the terminal pin metadata.
Fix all mismatches
Check power parts first
Use manufacturer datasheets
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5055512420

5055512420 thumbnail
24 Position Connector Plug, Outer Shroud Contacts Surface Mount Gold The 5055512420 is a high-density board-to-board (mezzanine) connector from Molex, designed for compact electronic assemblies requiring reliable and low-profile PCB interconnections. This connector belongs to the SlimStack 505551 series, which is optimized for fine-pitch, space-saving designs. It is a plug-type (male) connector intended to mate with a corresponding receptacle to create a stacked PCB configuration. Key Features Connector Type: Board-to-board (mezzanine), plug with outer shroud contacts Number of Positions: 24 pins Pitch: 0.40 mm (fine pitch for high-density layouts) Rows: 2 (dual-row configuration) Mounting Type: Surface Mount (SMT) Mated Height: ~0.8 mm (ultra-low profile stacking) Height Above PCB: ~0.68 mm Contact Finish: Gold-plated contacts for reliable conductivity Feature: Solder retention for improved mechanical stability during assembly The 5055512420 enables direct PCB-to-PCB connections without the need for cables. Its fine pitch and low stacking height make it ideal for compact devices where vertical space is limited. The outer shroud design helps improve alignment and mating reliability, while gold-plated contacts ensure stable electrical performance over repeated connections. #CommonPartsLibrary #Connector #SlimStack 505551 #505551-2420

Properties

505551-2420

Molex

Connectors

molex.com/content/dam/molex/molex-dot-com/products/automated/en-us/salesdrawingpdf/505/505551/5055512420_sd.pdf?inline

J

TO

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