An MLCC second source for a board built in Ireland can sometimes be found inside one manufacturer’s catalogue: we grouped 23,594 Walsin Technology (Walsin) MLCC part numbers into 7,570 specifications by size, dielectric, capacitance and voltage, and 2,732 of them exist in two or more Walsin series.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this from Walsin’s MLCC export (00_ALL_MLCC_parts_combined.xlsx, 24,026 rows, 23,601 distinct part numbers, 7 of them without a readable capacitance) and our stock list as at 23 September 2026. It is for a buyer or engineer in Ireland’s semiconductor, medtech and industrial electronics base. Every count was re-measured by us on 11 November 2026 and every part number is real. This is supply-chain perspective, not legal advice.
What does the Chips Act 2.0 briefing of 3 November 2026 say?
It summarises a proposal that is still in negotiation. According to a LexisNexis news item of 3 November 2026 on a European Parliament briefing, the Commission’s Chips Act 2.0, presented on 3 June 2026, would replace Regulation (EU) 2023/1781, cap permitting for strategic projects at 12 months, add demand accelerators and revise monitoring and crisis response.
eeNews Europe reported on 12 August 2026 that the institutions target the second quarter of 2027 to finish negotiations, that the proposal tightens supply-chain monitoring, and that legislative documents envisage about 70 million euros for a business-to-business supply-chain platform. Ireland is directly concerned: the Irish Examiner reported on 19 April 2026 that Analog Devices’ 630 million euro Limerick expansion sits within the EU’s Important Projects of Common European Interest framework. Those are the reports’ statements, not ours.
What does supply-chain monitoring mean for an Irish buyer of passives?
Mostly, more questions about where the parts on your BOM can come from. Chips Act 2.0 is about semiconductors, not capacitors, but its monitoring and crisis-response pillars ask the same thing a buyer asks of a 0603 MLCC: if this line stops, what is the second source, and is it already qualified?
The usual answer is a second manufacturer, crossed field by field. A second answer is often overlooked: the same specification built in a different series of the same manufacturer, with a different termination, automotive label or construction. That can shorten requalification, because the supplier documents and audits are already on file, though it does not remove the need to test. Our posts on how to cross-reference an MLCC and AEC-Q200 MLCC: MT vs MG series cover the method.
How often does one Walsin MLCC specification exist in more than one series?
In just over a third of specifications, which hold two thirds of the parts. We grouped the parts by size, dielectric, capacitance and rated voltage: 7,570 specifications, of which 2,732 appear in two or more Walsin series and 4,838 in only one; 15,921 part numbers sit in multi-series specifications and 7,673 in single-series ones.
| Cut | Count | What it means |
|---|---|---|
| Specifications (size, dielectric, capacitance, voltage) | 7,570 | Distinct electrical briefs in the export |
| Specifications in 2 or more series | 2,732 | An in-catalogue alternative exists |
| Specifications in 1 series only | 4,838 | Second source has to be another maker |
| Shelf MLCC lines matched to the export | 762 of 864 | As at 23 September 2026 |
| Matched shelf lines whose spec spans 2+ series | 560 | 73 percent |
| Matched shelf General Purpose lines with an AEC-Q200 MT twin | 289 of 490 | Same four fields, MT series |
We left tolerance out of the key because the MG series’ Tolerance column holds a non-tolerance value on most rows, a defect we have published before. We have not seen these second-source counts published anywhere else.
What does an in-catalogue MLCC second source look like at 0603, 100 nF, 50 V?
Thirteen part numbers in six series, three of them on our shelf. At 0603, X7R, 100 nF, 50 V, we found 13 Walsin parts in the General Purpose, MT, MG, ST, SG and SH series; 0603B104K500, 0603B104M500 and SH18B104K500 are on our shelf.
| Walsin part | Series | Thickness in export | On shelf 23 Sep 2026 | Match / mismatch against 0603B104K500 |
Your incumbent |
|---|---|---|---|---|---|
0603B104K500 |
General Purpose | 0.80 +0.15/-0.10 mm | Yes | Reference line | |
MT18B104K500 |
MT, AEC-Q200 | 0.80 +0.15/-0.10 mm | No | Match on all four fields and thickness; adds AEC-Q200 series | |
MG18B104K500 |
MG, automotive without AEC-Q200 | 0.80 +0.15/-0.10 mm | No | Match on four fields; tolerance column defective | |
ST18B104K500 |
ST, soft termination, AEC-Q200 | 0.80 plus or minus 0.30 mm | No | Match on four fields; mismatch on thickness tolerance | |
SH18B104K500 |
SH, soft termination, Ag-poly | 0.80 plus or minus 0.30 mm | Yes | Match on four fields; mismatch on thickness tolerance and termination | |
SG18B104K500 |
SG, soft termination, Cu-poly | 0.80 plus or minus 0.30 mm | No | Match on four fields; mismatch on thickness tolerance |
The soft-termination parts carry a wider thickness tolerance, which matters for tight stencils and pick-and-place height checks. A match is a match on export fields only. Confirm against both datasheets, Walsin’s General Purpose and MT sheets among them, and qualify in your own circuit.
Which stocked lines have no second series, and what then?
202 of the 762 matched shelf lines. We counted 115 General Purpose, 74 Middle and High Voltage, 9 Microwave RF, 2 High Temperature, 1 Ultra Microwave and 1 large-size line whose specification exists in no other Walsin series, for example 0402B202K500 and 0603B181K101.
For those lines the second source has to be another manufacturer, and that is where a field-by-field cross earns its keep. Many of them are odd values, such as 2,000 pF or 500 pF, which a competitor may also not list. We will not call another maker’s part a drop-in match until the fields say so; we show where it differs and leave the qualification with you. Note too that 102 of our 864 MLCC shelf lines have no row in the parametric export at all.
How can Venatech help an Irish sourcing or design team?
How Venatech helps: the 7,570 specifications above are what the free tool searches. The cross-reference tool, VenaMatch, decodes 18 manufacturers’ part numbers across 800,000+ crossable parts, accepts up to 500 part numbers or an Excel or CSV file, filters by commercial or automotive grade and by soft termination, and states every difference from your original.
Upload a BOM at BOM upload to request a quote. The ready-stock list is a Hong Kong snapshot dated 23 September 2026, never live-synced; the MLCC range lists the series. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We serve from Hong Kong in small lots, give no price, lead time or stock guarantee, hold no office or stock in Ireland, and give no legal or compliance advice: confirm with your compliance team.
The short version
Chips Act 2.0 is still a proposal, but its monitoring and crisis pillars push every buyer towards a written second-source plan. For MLCC, 2,732 of 7,570 Walsin specifications already exist in two or more series, and 560 of our 762 matched shelf lines have that in-catalogue option; the other 202 need a cross to another maker.
Paste your MLCC list into the free cross reference, or send it to us, and we will mark which lines have a second Walsin series and which need another manufacturer, with every difference stated. How many of your lines are single-source today?
Sources
Fetched 11 November 2026.
- LexisNexis, “European Parliament briefing highlights proposed EU Chips Act 2.0 reforms”, 3 November 2026: https://www.lexisnexis.co.uk/legal/news/european-parliament-briefing-highlights-proposed-eu-chips-act-2-0-reforms
- eeNews Europe, “Chips Act 2: Europe’s second semiconductor push”, 12 August 2026: https://www.eenewseurope.com/en/chips-act-2-europe-second-semiconductor-push/
- Irish Examiner, “Analog Devices bolstering Europe’s chips ambition”, 19 April 2026: https://www.irishexaminer.com/business-columnists/arid-41830004.html
Related reading
- How to cross-reference an MLCC
- AEC-Q200 MLCC: MT vs MG series
- Soft termination MLCC: SH, SG, ST and VT
- Free tools: VenaMatch cross reference and the ready stock list
Last reviewed 11 Nov 2026.
Frequently asked questions
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What is in the Chips Act 2.0 proposal summarised on 3 November 2026?
A LexisNexis item on a European Parliament briefing says the proposal, presented on 3 June 2026, would replace Regulation (EU) 2023/1781, cap strategic-project permitting at 12 months, add demand accelerators and revise monitoring and crisis response. It is not yet adopted.
What is an in-catalogue MLCC second source?
The same size, dielectric, capacitance and voltage built in a different series of the same manufacturer. In Walsin’s export, 2,732 of 7,570 specifications have one. It can shorten requalification, but you still test it in your circuit.
How many Walsin parts share the 0603, X7R, 100 nF, 50 V specification?
We counted 13 in six series: General Purpose, MT, MG, ST, SG and SH. 0603B104K500, 0603B104M500 and SH18B104K500 are on our shelf as at 23 September 2026.
Does a soft-termination MLCC fit the same footprint as a standard one?
The size code is the same, but in the 0603, 100 nF example the soft-termination parts carry a thickness tolerance of plus or minus 0.30 mm against plus 0.15 or minus 0.10 mm. Check stencil and placement height.
How many of your stocked MLCC lines have a second Walsin series?
560 of the 762 shelf lines we matched to the export. 202 have no other Walsin series, so their second source has to be another manufacturer. 102 of our 864 MLCC shelf lines have no export row.
Do you give compliance advice on the Chips Act?
No. This is supply-chain perspective only. We hold no office or stock in Ireland and give no legal, customs or compliance advice, and no price, lead time or stock guarantee. Confirm with your compliance team.