Part Review Check

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2920L500/24SL Part Review
Reviewed available part information for the published part project 2920L500_24SL: MPN, package, pin count, description, project properties, ...
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Completed the part review and documented the full findings in 2920L500/24SL Part Review. The datasheet URL was already set, so I did not change it; the footprint pad geometry matches the datasheet, but the footprint/module name references 2920L700SLPR, and the pin metadata should be improved.
Open items:
  • Rename/clean up the footprint/module value from 2920L700SLPR.
  • Set both pins to Passive and add non-polarized PPTC terminal descriptions.
  • Consider changing package metadata from SMD to SMD 2920.
Suggested next steps:
  1. Update the pin metadata and package field.
  2. Rename the footprint/module label to a generic/correct 2920 PPTC name.
  3. Optionally switch the datasheet URL to the Littelfuse-hosted URL.
Fix metadata and review
Fix part issues
Use Littelfuse URL
Run ERC/DRC
Export review report
1
Pin Number
1
2
Pin Number
2

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2920L500/24SL Part Review
Scope
Reviewed available part information for the published part project 2920L500_24SL: MPN, package, pin count, description, project properties, schematic terminals, pin descriptions, footprint pads, 3D/model reference, and datasheet-derived specifications.
Existing project metadata

Table

FieldCurrent valueReview
Project / part name2920L500_24SLMatches the target MPN naming style.
DescriptionPTC 24V POLYFUSE SMD 2920 SL 5.00A / TRConsistent with a 24 V, 5 A SMD resettable PPTC/polyfuse.
Manufacturer NameLittelfuseMatches datasheet.
Manufacturer Part Number2920L500/24SLMatches datasheet extraction.
Package or Case CodeSMDNot incorrect, but too broad; datasheet package is 2920. Prefer SMD 2920 or 2920.
Part TypeCircuit Protection DevicesAcceptable broad category; more specific metadata would be Resettable Fuse, PPTC, or PolySwitch PPTC if supported.
Designator PrefixFAppropriate for fuse/PTC protection part.
MountSurface MountMatches datasheet.
Pads2Matches datasheet.
Datasheet URLhttps://www.mouser.fr/datasheet/2/240/littelfuse_ptc_low_rho_datasheet_pdf-1901322.pdfAlready populated, so no update was required by the request. This appears to be the Littelfuse datasheet hosted by Mouser. A manufacturer-hosted Littelfuse URL was also found: https://www.littelfuse.com/assetdocs/resettable-ptcs-low-rho-smd-ptc-datasheet?assetguid=b786faf0-de16-4763-9d22-6b8080943caf.
Datasheet key specifications
Source: Littelfuse PolySwitch / Low Rho Series SMD PPTC datasheet for 2920L500/24SL.

Table

SpecificationDatasheet value
Series / functionLow Rho Series PolySwitch resettable PPTC
Package size2920 SMD
Terminal count2 terminals / 2 solder pads
PolarityNon-polarized; both terminals are equivalent PPTC ends
MarkingLF 50J
Hold current, Ihold5.00 A
Trip current, Itrip10.00 A
Maximum voltage, Vmax24 Vdc
Maximum current, Imax50 A
Typical power dissipation, Pd2.2 W
Maximum time to trip2.00 s at 25.00 A
Initial resistance, Rmin0.001 ohm
Post-trip / R1max0.018 ohm
Operating temperature-40°C to +85°C
Max surface temperature in tripped state125°C
Terminal materialSolder-plated copper, matte tin (Sn)
Hold-current derating from datasheet

Table

Ambient temperatureHold current
-40°C8.20 A
-20°C7.25 A
0°C6.25 A
20°C5.00 A
40°C4.25 A
60°C3.25 A
70°C2.80 A
85°C2.05 A
Schematic symbol / pin review
Current schematic terminals

Table

Schematic terminalCurrent pin numberCurrent pin typeCurrent pin descriptionDatasheet expectationReview
Terminal component ~::4ebd240a1UnspecifiedMissing / undefinedOne end of non-polarized PPTC elementFunctional terminal count is correct; pin type should ideally be Passive; description should be added.
Terminal component ~::5cb28b4b2UnspecifiedMissing / undefinedOther end of non-polarized PPTC elementFunctional terminal count is correct; pin type should ideally be Passive; description should be added.
Symbol conclusion
The two-terminal non-polarized symbol concept matches the datasheet. The main symbol issue is metadata completeness: both terminals are currently Unspecified and have no pin descriptions. For ERC quality and library clarity, both pins should be Passive with descriptions such as PPTC terminal 1, non-polarized and PPTC terminal 2, non-polarized.
Footprint review
For 2920L500/24SL, the datasheet gives the solder pad layout:

Table

SymbolMeaningDatasheet value
FIndividual pad length2.00 mm
GGap between pads4.60 mm
HPad width5.30 mm
Center-to-center spacingG + F6.60 mm
Current footprint geometry from embedded KiCad module

Table

FeatureCurrent footprint valueDatasheet comparison
Pad 1 centerx = -3.300 mmCorrect for 6.60 mm center spacing.
Pad 2 centerx = +3.300 mmCorrect for 6.60 mm center spacing.
Pad size2.000 mm × 5.300 mmMatches F = 2.00 mm and H = 5.30 mm.
Inner pad gap6.60 - 2.00 = 4.60 mmMatches G = 4.60 mm.
Fab outline7.356 mm × 5.120 mmWithin datasheet body range A = 6.73–7.98 mm and B = 4.80–5.44 mm.
Courtyard10.6 mm × 7.3 mmReasonable clearance around the 2920 body.
Footprint conclusion
The pad placement and solder land dimensions match the datasheet recommendation for 2920L500/24SL.
Mismatches and concerns
  1. Footprint/module name is misleading: the embedded KiCad module/value is 2920L700SLPR, while the project MPN is 2920L500/24SL. The geometry appears correct and likely shared across 2920 variants, but the footprint name/value should be renamed to a generic/correct name such as Littelfuse_2920_PPTC or 2920L500_24SL to avoid review and BOM confusion.
  2. Package metadata is underspecified: Package or Case Code = SMD should preferably be SMD 2920 or 2920.
  3. Pin type metadata is weak: both terminals are Unspecified; for a fuse/PTC they should be Passive.
  4. Pin descriptions are missing: add non-polarized PPTC terminal descriptions for pins 1 and 2.
  5. Datasheet URL is distributor-hosted: it is already populated and appears to be the correct Littelfuse datasheet, so no update was required. A Littelfuse-hosted URL is available and may be preferable for long-term source authority.
Overall assessment
No serious electrical rating or footprint geometry mismatch was found. The part is fundamentally consistent with the Littelfuse 2920L500/24SL datasheet, but library polish should address the misleading footprint name, broad package metadata, and missing/unspecified pin metadata.

  • Scope

  • Existing project metadata

  • Datasheet key specifications

  • Hold-current derating from datasheet

  • Schematic symbol / pin review

  • Current schematic terminals

  • Symbol conclusion

  • Footprint review

  • Datasheet recommended land pattern

  • Current footprint geometry from embedded KiCad module

  • Footprint conclusion

  • Mismatches and concerns

  • Overall assessment

Documents

  • 2920L500/24SL Part Review

Assets

image1.png

image1.png

image1Thumbnail
stp

2920L500_24SL

2920L500_24SL.stp3D Model
2920L500_24SL

2920L500_24SL

2920L500_24SL Symbol.svgDefault
kicad_mod

2920L500_24SL

2920L700SLPR.kicad_modFootprint

2920L500/24SL

2920L500/24SL thumbnail
2920L500/24 is a 24 V, 5 A hold-current resettable PPTC/polyfuse in a surface-mount 2920 package, designed for overcurrent protection of 12 V PCB power buses. PTC 24V POLYFUSE SMD 2920 SL 5.00A / TR Keywords: 2920L500/24, 5A resettable fuse, 24V PPTC, 2920 polyfuse, PCB power protection ~5A resettable PTC/polyfuse for 12V PCB power bus

Properties

2920L500/24SL

Littelfuse

Circuit Protection Devices

mouser.fr/datasheet/2/240/littelfuse_ptc_low_rho_datasheet_pdf-1901322.pdf

F

Surface Mount

SMD

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