Part Datasheet Review

flux

I found the official Littelfuse MINI® FL1 datasheet and am checking whether the part already has a datasheet link before updating it.

flux

The part already has a Datasheet URL, so I did not overwrite it. I’m now checking the symbol and footprint against the current Littelfuse datasheet and official product resources.
Created a project doc

Part Datasheet Review - Littelfuse 178.6764.0001

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Date: 2026-07-22 Reviewed available Flux part information for Littelfuse 178.6764.0001, including MPN, package/case information, pin count, ...

flux

Completed the part review and saved the detailed findings in Part Datasheet Review - Littelfuse 178.6764.0001. The Datasheet URL was already present, so I did not overwrite it.
Open items:
  • Footprint is high-risk/unverified: pad spacing, drill size, and hole count may not match Littelfuse’s recommended hole pattern.
  • Pin metadata is incomplete: both terminals are Unspecified with no pin descriptions.
  • Current Littelfuse rating appears to be 58 VDC / 22 A continuous / 30 A max, while the linked older datasheet shows 125 V / 30 A.
Suggested next steps:
  1. Obtain the official Littelfuse 2D print / installation drawing and rebuild or verify the footprint.
  2. Update terminal pin types/descriptions to passive fuse-holder contacts.
  3. Consider updating the Datasheet URL to the current 2025 Littelfuse datasheet if you want the newest ratings as the primary reference.
Fix pins and footprint
Fix pin metadata
Find 2D print
Rebuild footprint
Update datasheet link
Run validation
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Pins

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2
Pin Number
2
1
Pin Number
1
Part Datasheet Review - Littelfuse 178.6764.0001
Date: 2026-07-22
Scope
Reviewed available Flux part information for Littelfuse 178.6764.0001, including MPN, package/case information, pin count, description, properties, schematic symbol terminals, footprint geometry, and pin descriptions. Checked the existing Datasheet URL and compared against Littelfuse datasheet/product resources.
Existing Part Information Found in Flux

Table

FieldCurrent Flux value
Project / part178.6764.0001
Manufacturer Part Number178.6764.0001
ManufacturerLittelfuse
DescriptionFuse holder, PCB, FK1 / MINI blade
Part TypeCircuit Protection Devices
MountPCB / through-hole style
Package / casePCB-mount MINI blade fuse holder; terminal pitch noted as 7.62 mm in metadata
Pin / terminal count2 electrical terminals
Datasheet URLhttp://www.littelfuse.com//media/commercial-vehicle/datasheets/automotive-fuse-holders/mini/littelfuse-fuseholder-mini-fl1-pcb-mount.pdf
AssetsSTEP model 178.6764.0001.stp, KiCad footprint 17867640001.kicad_mod, SVG symbol, thumbnail
The Datasheet URL was already set, so it was not overwritten.
Datasheet Sources Checked

Table

SourceNotes
Existing Flux Datasheet URLOlder official Littelfuse / commercial-vehicle PDF: PCB Mount Fuse Holder for MINI® Style Blade Fuse, Rev. 111616, lists 125 V / 30 A and includes a small mechanical / PCB hole-pattern drawing.
Current Littelfuse datasheetOfficial Littelfuse asset: https://www.littelfuse.com/assetdocs/mini-fl1-datasheet?assetguid=86e3ab08-0473-4acb-98d6-4cf3dbe2f0fa, titled MINI® FL1 Series — 58V PCB Fuse Holder, Rev. 101425.
Littelfuse product pageConfirms active product, series MINI-FL1, part 178.6764.0001, related resources including datasheet and 2D print.
Key Specs from Current Littelfuse Datasheet / Product Page

Table

ParameterDatasheet value
ManufacturerLittelfuse
MPN178.6764.0001
SeriesMINI-FL1
Description / ordering rowHolder For FL1 (MINI) PCB – 100 Pieces
Product statusActive
FunctionPCB fuse holder for one MINI blade fuse; fuse not included
Fuse compatibilityMINI® 32 V DC and MINI® 58 V DC blade fuses
Mounting methodPCB mount
Continuous current22 A
Maximum current30 A
Maximum voltage, current datasheet58 V DC
Terminal pitch7.62 mm
Body materialHeat-resistant black glass-fiber-reinforced PBT
FlammabilityUL 94 V-0
Terminal materialTin-plated copper alloy
Packaging100 pieces
Rating / Datasheet Revision Note
There is a revision difference between datasheets:
  • Current Littelfuse datasheet / product page: 58 V DC, 22 A continuous, 30 A max.
  • Older Littelfuse / distributor copies: 125 V / 125 VDC, 30 A max, max contact temperature 130 °C.
Recommendation: treat the current Littelfuse 2025 datasheet values as the primary electrical ratings for new designs unless Littelfuse confirms that the older 125 V rating is still applicable for the exact use case.
Schematic Symbol / Terminal Check

Table

TerminalCurrent Flux dataDatasheet expectationStatus
1Pin Number 1; Pin Type Unspecified; no Pin DescriptionPassive fuse-holder contact / terminalMismatch: pin type and description incomplete
2Pin Number 2; Pin Type Unspecified; no Pin DescriptionPassive fuse-holder contact / terminalMismatch: pin type and description incomplete
The two-terminal schematic representation is logically appropriate for a single fuse holder. However, the terminal metadata should be cleaned up: both pins should be passive/contact terminals with clear pin descriptions such as Fuse holder contact terminal 1 and Fuse holder contact terminal 2.
Footprint Geometry Found in Flux
Footprint asset: 17867640001.kicad_mod.
Key footprint features:

Table

FeatureCurrent footprint
Electrical pad 1Through-hole circular pad at (-4.000, -0.8), size 2.4 mm, drill 1.6 mm
Electrical pad 2Through-hole circular pad at (4.000, -0.8), size 2.4 mm, drill 1.6 mm
Electrical pad spacing8.0 mm center-to-center
Additional holePad 3, non-plated through-hole at (0, 0), size/drill 2.8 mm
Fab outline14.2 mm × 7.45 mm rectangle
Courtyard16.2 mm × 9.45 mm rectangle
3D model178.6764.0001.stp
Footprint Cross-Check Result
High-risk mismatch / not verified.
Issues:
  1. 8.0 mm pad spacing vs 7.62 mm terminal pitch
    The current footprint places electrical pad centers 8.0 mm apart. The current Littelfuse datasheet states the fuse-holder terminals fit a 7.62 mm pitch. Older drawing snippets show an 8 mm ±0.15 dimension, so this may be a drawing-context issue, but the discrepancy must be resolved against Littelfuse’s official 2D print / installation drawing before production.
  2. Drill size likely questionable
    The current footprint uses 1.6 mm drills for the two electrical pads. The older manufacturer drawing appears to show approximately Ø0.8 mm holes. If Ø0.8 mm is correct, the current Ø1.6 mm drills are significantly oversized.
  3. Possible missing physical holes / pads
    The older PCB hole pattern appears to show multiple holes and several offsets, not simply two large electrical holes plus one center NPTH. If the actual part has multiple solder stakes or contact legs per electrical terminal, the footprint should implement multiple physical plated holes tied to pin 1 and/or pin 2 rather than one oversized hole per terminal.
  4. Center NPTH not confirmed
    The 2.8 mm center NPTH in the current footprint was not confirmed from the accessible current datasheet. It may be valid if the part has a plastic locating post, but it should be checked against the Littelfuse 2D print.
  5. Current datasheet lacks full footprint detail
    The current 2025 datasheet points to Littelfuse product resources for the 2D print / installation guide and does not embed full PCB hole/pad geometry. The exact footprint cannot be fully verified from the current one-page datasheet alone.
Mismatch Summary

Table

AreaStatusDetails
MPNOK178.6764.0001 matches Littelfuse sources.
ManufacturerOKLittelfuse matches sources.
DescriptionOKPCB MINI / FK1 blade fuse holder matches sources.
Pin countOK for schematic2 electrical terminals is correct for one fuse circuit.
Datasheet URLPresentExisting URL is official/legacy, so no update was made. Current Littelfuse URL should be considered for future update.
Electrical ratingsNeeds revision awarenessCurrent source says 58 V DC, 22 A continuous, 30 A max; older source says 125 V / 30 A.
Pin descriptionsMismatch / incompletePin Type is Unspecified; Pin Description missing for both terminals.
FootprintHigh-risk mismatch / unverifiedPad spacing, drill size, and physical hole count may not match manufacturer drawing.
3D modelNot fully verifiedSTEP asset exists; no clear mismatch observed from the available data, but should be checked after footprint is corrected/verified.
Recommendation
Do not treat this part as production-ready until the official Littelfuse 2D print / installation drawing is obtained and the footprint is verified or rebuilt. The most important checks are hole count, electrical pad grouping, hole diameters, terminal center spacing, and locating post geometry.
An internal Flux part-quality report was filed for the likely footprint and terminal-metadata issue.

  • Scope

  • Existing Part Information Found in Flux

  • Datasheet Sources Checked

  • Key Specs from Current Littelfuse Datasheet / Product Page

  • Rating / Datasheet Revision Note

  • Schematic Symbol / Terminal Check

  • Footprint Geometry Found in Flux

  • Footprint Cross-Check Result

  • Mismatch Summary

  • Recommendation