Murata Part Review
Worked for 3 mins 1 sec
The official Murata datasheet is already set, so I’m not changing that field. I found metadata and footprint issues and am writing the detailed cross-check into a project file.
Worked for 1 min 58 sec
Created a project doc
Completed the part review and saved the detailed findings in Part Datasheet Cross-Check: LQM21PN4R7MGRD. The Datasheet URL was already set to the Murata PDF, so I did not change it.
Open items:
- MPN and manufacturer fields are incorrect.
- Inductance property is blank.
- Symbol terminal descriptions are missing.
- Footprint pads are effectively zero-sized/mis-spaced and do not match Murata’s recommended land pattern.
Suggested next steps:
- Correct the part metadata properties.
- Fix terminal names/descriptions.
- Rebuild the 0805 footprint pads to the Murata land pattern.
Fix part metadata
Correct metadata
Fix footprint pads
Add terminal descriptions
Run review checks
Refine this doc
Ask about this doc
Part Datasheet Cross-Check: LQM21PN4R7MGRD
Date: 2026-07-13
Project: LQM21PN4R7MGRD
Reviewed Sources
- Current Flux part project metadata and properties
- Schematic terminals and pin properties
- PCB footprint pad rules and footprint geometry
- Existing Datasheet URL property: https://search.murata.co.jp/Ceramy/image/img/P02/JELF243B-0026.pdf
- Datasheet content extracted from Murata reference specification
JELF243B_0026N-01, titledCHIP COIL (CHIP INDUCTOR) for Consumer equipment & Industrial equipment LQM21PN□□□□GR□ REFERENCE SPECIFICATION - Web search confirmation for
LQM21PN4R7MGRD official datasheet Murata
Current Part Information in Flux
Table
| Field | Current value | Datasheet / expected value | Status |
|---|---|---|---|
| Part name | LQM21PN4R7MGRD | LQM21PN4R7MGRD | OK |
| Description | LQM21PN_GR Series Inductor 4.7uH +/-20% 0805 (2012) | Chip coil / chip inductor, 4.7 uH +/-20%, 0805 / 2012 class | OK |
| Terminal / pad count | 2 | 2-terminal SMD chip inductor | OK |
| Designator Prefix | L | Inductor prefix L is appropriate | OK |
| Datasheet URL | Murata JELF243B-0026.pdf URL | Official Murata reference specification URL is already present | OK; no update needed |
| Manufacturer Part Number | https://www.mouser.co.uk/ProductDetail/Murata-Electronics/LQM21PN4R7MGRD?... | LQM21PN4R7MGRD | MISMATCH: field contains a Mouser product URL instead of the MPN |
| Manufacturer Name | 81-LQM21PN4R7MGRD | Murata Manufacturing Co., Ltd. / Murata Electronics | MISMATCH: field contains a Mouser ordering code rather than manufacturer name |
| Part Type | Inductors | Chip inductor / fixed inductor | OK, though plural/general |
| Package or Case Code | L0805 | 0805 / 2012 metric Murata LQM21 package family | OK / acceptable |
| Inductance | blank value with unit H | 4.7 uH | MISMATCH: property is present but empty |
Key Datasheet Specs
Table
| Parameter | Datasheet value |
|---|---|
| Manufacturer part number | LQM21PN4R7MGRD |
| Manufacturer | Murata Manufacturing Co., Ltd. |
| Part family | LQM21PN_GR chip inductor |
| Inductance | 4.7 uH |
| Tolerance | +/-20% (M) |
| Measurement frequency | 1 MHz |
| DC resistance | 0.23 ohm +/-25%; equivalent max about 0.288 ohm |
| Self-resonant frequency | 30 MHz minimum |
| Rated current at 85 C ambient | 0.8 A |
| Rated current at 125 C ambient | 0.6 A |
| Temperature rise at rated current | 40 C max |
| Operating temperature | -55 C to +125 C |
| Storage temperature | -55 C to +125 C |
| Unit mass | 0.012 g typical |
| Marking | No marking |
Packaging code D | Tape; 4000 pcs/reel per datasheet packaging section |
| Recommended land dimensions | a = 1.2 mm, b = 3.0 to 4.0 mm, c = 1.0 mm |
| Solder paste thickness | 100 um to 150 um |
| Standard reflow peak | 245 C +/-3 C, 2 cycles |
| Limit reflow peak | 260 C / 10 s, 2 cycles |
Symbol Cross-Check
The schematic contains two terminal components, with pin numbers 1 and 2. That matches a non-polarized 2-terminal chip inductor.
Issues found:
- Both terminals have
Pin Type: Unspecified. For a passive inductor this is usually acceptable, but using a passive bidirectional/electrical passive terminal type would be clearer if available. - The terminal pin label appears as
undefinedin the schematic data. Pin numbers are present (1and2), but terminal names/descriptions are not populated. - No pin descriptions are set. Suggested descriptions:
Terminal 1andTerminal 2, or equivalent non-polarized inductor terminals.
Footprint Cross-Check
Current layout data shows:
- 2 pads total, matching the datasheet terminal count.
- Both pads are SMD rectangular pads on the top layer.
- Pad centers are at approximately x = +/-0.001175 mm, y = 0 mm.
- Pad size is approximately 0.001 mm x 0.00115 mm.
- Footprint silkscreen/fab outlines render roughly as an 0805 body outline, but the pads are effectively collapsed near the origin and are far too small for a 2012 / 0805 inductor footprint.
Datasheet recommended land dimensions are
a = 1.2 mm, b = 3.0 to 4.0 mm, c = 1.0 mm. Interpreting the Murata drawing convention, this corresponds to two rectangular pads approximately 1.0 mm wide by 1.2 mm long, with total outside pad span b in the 3.0 to 4.0 mm range. For a centered footprint, expected pad centers would be separated by roughly b - a, i.e. about 1.8 mm to 2.8 mm depending on selected land span.Footprint mismatch:
- Current pad dimensions and spacing do not match the recommended Murata land pattern and are not manufacturable as-is.
- Current pad geometry appears off by roughly three orders of magnitude; values look like meters-to-mm scaling leakage or an incorrectly entered rule value.
Mismatch Summary
Manufacturer Part Numberis incorrect: it contains a Mouser URL, notLQM21PN4R7MGRD.Manufacturer Nameis incorrect: it contains Mouser order code81-LQM21PN4R7MGRD, not Murata.Inductanceproperty is empty; should be4.7 uH.- Symbol terminal names/descriptions are missing; terminal data appears as
undefineddespite pin numbers being present. - Footprint pads are incorrect: pad positions and sizes are effectively zero and do not match Murata land dimensions.
- Datasheet URL is already present and appears to point to the official Murata PDF, so no Datasheet property update was required.
Recommended Corrections
- Set
Manufacturer Part NumbertoLQM21PN4R7MGRD. - Set
Manufacturer NametoMurata Manufacturing Co., Ltd.orMurata Electronics. - Set
Inductanceto4.7 uHand retain tolerance+/-20%if a tolerance property is added. - Add pin descriptions for the two non-polarized terminals.
- Rebuild or correct the footprint pads using Murata recommended land dimensions: pad length about 1.2 mm, pad width about 1.0 mm, and total outside land span between 3.0 mm and 4.0 mm.
Reviewed Sources
Current Part Information in Flux
Key Datasheet Specs
Symbol Cross-Check
Footprint Cross-Check
Mismatch Summary
Recommended Corrections
