An AEC-Q200 MLCC at 0603, 100 nF, X7R and 50 V or more has 9 Walsin Technology (Walsin) candidates for a Curitiba, Brazil supplier: 4 in the MT series and 5 in the soft-termination ST series. We counted 2,283 AEC-Q200 series MLCC in total, and none was on the Hong Kong shelf on 23 September 2026.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design, quality or sourcing engineer at an automotive electronics supplier around Curitiba and Sao Jose dos Pinhais in Parana, Brazil. We measured every count from our Walsin MLCC export, the Venatech_MLCC_Upload .xlsx files (23,360 distinct part numbers), from Walsin’s own approval sheets for the MT, ST and General Purpose series, and from our stock list as at 23 September 2026. Market facts name their source and the day we fetched them, 11 November 2026.
What did Renault and Geely announce for Parana in September 2026?
More money for the Ayrton Senna plant. According to Automotive World on 16 September 2026, Renault and Geely added 319 million euros (368 million US dollars) to their Brazil venture, taking combined investment for 2025 to 2027 to 899 million euros, for vehicles built at Renault’s Ayrton Senna plant in Sao Jose dos Pinhais, Parana.
The same report says local production of the Geely EX5 EM-i began in early September 2026, that the EX2 electric hatchback was due to start local production in December, and that a Renault electric vehicle on Geely’s GEA platform and a hybrid flex-fuel powertrain both start in 2027. Those are the publisher’s figures. For a Parana supplier, new electrified platforms mean new bills of materials, and every capacitor on an automotive board gets the same first question at design review: is it an AEC-Q200 MLCC?
Which Walsin AEC-Q200 MLCC parts cross a 0603, 100 nF, X7R, 50 V brief?
Nine of twenty-one candidates. We filtered the MLCC export to 0603, 100 nF, X7R and 50 V or above and found 21 part numbers: 4 MT and 5 ST parts in AEC-Q200 series, 2 MG parts in a series Walsin names without AEC-Q200, 4 SH or SG soft-termination parts outside the automotive series, and 6 General Purpose parts.
Put your incumbent in the last column.
| Walsin part | Description | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|
MT18B104K500 |
MT series, 0603, 100 nF, X7R, 10 percent, 50 V | No | Match on size, value, dielectric, voltage and AEC-Q200 series | |
MT18B104K101 |
MT series, 0603, 100 nF, X7R, 10 percent, 100 V | No | Match, with voltage headroom to 100 V | |
ST18B104K500 |
ST soft termination, 0603, 100 nF, X7R, 10 percent, 50 V | No | Match; thickness tolerance 0.80 plus or minus 0.30 mm | |
ST18B104K101 |
ST soft termination, 0603, 100 nF, X7R, 10 percent, 100 V | No | Match; 100 V; wider thickness tolerance | |
MG18B104K500 |
MG series, 0603, 100 nF, X7R, 50 V | No | Mismatch: series named without AEC-Q200 | |
SH18B104K500 |
SH soft termination, 0603, 100 nF, X7R, 10 percent, 50 V | Yes | Mismatch: soft termination but not an AEC-Q200 series | |
0603B104K500 |
General Purpose, 0603, 100 nF, X7R, 10 percent, 50 V | Yes | Mismatch: not an automotive series | |
0603B104K101 |
General Purpose, 0603, 100 nF, X7R, 10 percent, 100 V | Yes | Mismatch: not an automotive series |
The other MT parts are MT18B104J500 and MT18B104M500 at 5 and 20 percent; the other ST parts are ST18B104M500, ST18B104J101 and ST18B104M101; the other soft-termination parts outside the automotive series are SH18B104J500, SH18B104K101 and SG18B104K500. A match is a match on the export fields. Confirm against both datasheets and qualify in your own circuit. Our guides to the MT and MG series and to what AEC-Q200 actually certifies explain the labels.
Is every Walsin automotive MLCC an AEC-Q200 MLCC?
No. Our export carries 2,283 part numbers in the two series Walsin names as qualified to AEC-Q200, 2,167 MT and 116 ST, and 783 more in the MG series, whose own series name reads “Without AEC-Q200 Certification”.
A filter on the word “Automotive” collects all three series and lets 783 MG parts through. The MG rows also write tolerance as a decimal, such as minus 0.1 rather than plus or minus 10 percent, so a tolerance filter can drop them by accident. Walsin’s MT approval sheet, 11_Automotive_MT.pdf, dated August 2026, states that the MT series meets the AEC-Q200 requirement. That is the manufacturer’s statement, not ours: request the qualification report for the exact part number.
What separates the MT and ST series on board flex?
The bend each one survives. Walsin’s approval sheets set the board-flex test at 2 mm deflection for MT X7R parts, 5 mm for the ST soft-termination series and 1 mm for General Purpose parts, according to 11_Automotive_MT.pdf, 12_Soft_Term_Automotive_ST.pdf and 01_General_Purpose.pdf.
That matters near a connector, a screw boss or a board edge in an engine-bay module, where the PCB flexes during assembly. The price of the soft termination is in the dimensions: the ST 0603 parts in our table publish thickness at 0.80 plus or minus 0.30 mm against 0.80 plus 0.15 or minus 0.10 mm for MT, so check pick-and-place nozzle and height limits. Our flex-cracking guide covers the mechanism.
What does the Hong Kong shelf hold in AEC-Q200 MLCC?
Nothing in those series. We checked all 2,283 MT and ST part numbers against our stock list as at 23 September 2026 and found 0; across the whole export, 740 of 23,360 MLCC part numbers appear on that list, including 3 General Purpose and 1 SH soft-termination 0603 100 nF X7R part.
So every AEC-Q200 MLCC in this post is a to-order enquiry, and the stocked General Purpose parts are a prototype or non-automotive option only. The ready-stock list is a dated snapshot, never live-synced, and the MLCC range lists the families. We give no lead time and no stock promise.
What will we not tell a Brazilian automotive electronics plant?
Anything about your PPAP or your customer’s approved list. We hold no ISO 9001 or IATF 16949 certificate, Venatech makes no qualification claim of its own about any part, and Walsin’s datasheets describe AEC-Q200 as a requirement met, not a certificate.
We hold no office, entity or stock in Brazil; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or import-tax advice; confirm with your compliance team.
How can Venatech help an automotive buyer in Brazil?
How Venatech helps starts with a free paste box. The cross-reference tool (VenaMatch) decodes 18 manufacturers’ part numbers, covers 800,000+ crossable parts, and lets you filter by grade, commercial or automotive, with the AEC-Q200 version listed beneath where one exists.
Load a whole BOM for a check, and see the ready-stock list, a Hong Kong snapshot dated 23 September 2026. Worked example from our own export: the 0603, 100 nF, X7R, 50 V AEC-Q200 brief returned 9 series matches among 21 candidates, none stocked. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We serve from Hong Kong in small lots and you request a quote through the site.
The short version
For a Parana automotive board, an AEC-Q200 MLCC is a series question first: MT and ST carry the AEC-Q200 statement, MG does not, and ST adds a 5 mm bend at the cost of a looser thickness. At 0603, 100 nF, X7R, 9 Walsin parts pass that test and none is on the shelf.
Send us one capacitor line from your BOM, with size, value, dielectric, voltage and the board-flex figure you need, and we will return the Walsin parts with every difference stated. Qualification stays with you.
Related reading
- AEC-Q200 MLCC: MT vs MG series
- Flex cracking and board bend: why soft termination exists
- What AEC-Q200 actually certifies
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Automotive World, Renault and Geely pledge US368m more to their Brazil JV, 16 September 2026: https://www.automotiveworld.com/news/renault-and-geely-pledge-us368m-more-to-their-brazil-jv/
- Walsin approval sheets held by Venatech: 11_Automotive_MT.pdf (August 2026), 12_Soft_Term_Automotive_ST.pdf, 01_General_Purpose.pdf.
- Venatech Walsin MLCC export (Venatech_MLCC_Upload .xlsx files) and stock list as at 23 September 2026, measured 11 November 2026.
Frequently asked questions
What did Renault and Geely invest in Parana, Brazil in 2026?
Automotive World reported on 16 September 2026 that the two companies added 319 million euros, taking combined Brazil investment for 2025 to 2027 to 899 million euros, for production at the Ayrton Senna plant in Sao Jose dos Pinhais. These are the publisher’s figures.
Which Walsin AEC-Q200 MLCC matches 0603, 100 nF, X7R, 50 V?
MT18B104K500 in the MT series and ST18B104K500 in the soft-termination ST series both match on the export fields. In all, 9 MT and ST parts fit at 50 V or 100 V. Confirm against the datasheet and qualify in your own circuit.
Is the Walsin MG series AEC-Q200?
No. Walsin’s own series name for MG reads “Without AEC-Q200 Certification”. We counted 783 MG part numbers against 2,283 in the MT and ST series, which Walsin names as qualified to AEC-Q200.
What board flex does a soft-termination AEC-Q200 MLCC survive?
Walsin’s ST approval sheet tests board flex at 5 mm deflection, against 2 mm for MT X7R parts and 1 mm for General Purpose parts. The ST 0603 parts publish a wider thickness tolerance, 0.80 plus or minus 0.30 mm.
Is any Walsin AEC-Q200 MLCC on the Hong Kong shelf?
No. None of the 2,283 MT and ST part numbers was on our stock list as at 23 September 2026. Three General Purpose parts and one SH soft-termination part at 0603, 100 nF, X7R were. The snapshot is dated, not live, so ask through the site.
Do you hold IATF 16949 or an office in Brazil?
No. We hold no ISO 9001 or IATF 16949 certificate and no office, entity or stock in Brazil. Our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. Confirm import and compliance questions with your compliance team.