BOM alterations to compensate for discontinued parts.

[jcspencer]

Hi there!

I wanted to open this issue to help future builders of this great design!

A number of parts have been withdrawn/changed slightly by manufacturers, so I'm sharing this list of BOM alterations I've made in the hopes that it will help anyone attempting to build this great PCB in the future :)

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Manufacturer notices

Below is a (potentially incomplete) list of part notices affecting this project that I've come across when sourcing parts:

Component	Description
Murata GR* Capacitors	A number of the GR* series capacitors from Murata used in the BOM have been discontinued - see notice (via mouser). I've proposed alternatives - all from Murata - that are as close to 1:1 replacements as possible. Note: C115, C179, C185, C186, C190, C194, C196 - although GRM series - don't seem to be affected by this withdrawal.
Panasonic EEF-{HX, CS, CT, CX} withdrawal	The Panasonic EEF-{HX, CS, CT, CX} capacitors are NRND; see notice (via mouser)
Cirrus Logic P/N changes	Fairly easy, just a part number change from the manufacturer for the CS5381; see notice (via mouser)
LEDs	The Panasonic LEDs used in the BOM are discontinued; see notice (via mouser)

BOM alternatives

This list is a set of substitutions I've made for parts in the BOM. I've made sure to steer clear of conflict materials (see note 2). Luckily, most parts are all clean substitutes to other parts by the same manufacturer, and don't require footprint changes.

BOM Designator	Original Part	Suggested Alternative
C1, C2, ...	81-GRM18R71H103JA01D	GCM188R71H103JA37D
C14, C51	81-GRM1885C1H272GA1D	GCM1885C1H272GA16D
C21, C28,...	81-GRM2195C1H153GA1D	GCM2195C1H153GA16D
C22, C29, ...	81-GRM2165C1H222FA1D	GCM2165C1H222FA16D
C23, C34, ...	81-GRM2195C1H682FA1D	GCM2195C1H682FA16D
C3, C27, ...	81-GRM39C471F50	GCM1885C1H471FA16D
C32, C43, ...	81-GRM39C150F50	GCM1885C1H150FA16D
C6, C8, ...	81-GRM188R71E105KA2D	GCM188R71E105KA64D
C7, C11, ...	81-GRM188R71H104JA3D	GCM188R71H104JA57D
C74, C94, ...	81-GRM21BR71A106KE51	GRM21BR71A106KA73L
C9, C37, ...	81-GRM21B5C1H183GA1L	GCM21B5C1H183FA16L
C180, C181, ...	81-GRM32ER61E226KE15	see note 1
C25, C45, ...	667-EEF-HX1C330R	667-EEF-CX1C330R (not a long-term solution - see note 2)
D1, D2, D3	667-LNJ337W83RA	ASMT-RF45-AN002
U3	777-CS5381-KZZ	777-CS5381K-KZZR

• Note 1: These capacitors are affected by the withdrawal, but the stock levels at Mouser, etc. are still significant as of Feb. 2026.
• Note 2: The CX variant of the same cap is still stocked, whereas the HX is completely out at the time of writing (where the difference only appears to be longevity/temperature rating). Panasonic's only suggested replacements that match the footprint use tantalum 👎 , so the CX is likely the best short-term option without requiring board changes.