An AEC-Q200 MLCC rated 630 V or more is a narrow choice for EV drive electronics in Hungary. Of 2,291 Walsin AEC-Q200 part numbers, 104 reach 630 V. At 630 V the X7R ceiling is 10 nF, in 1206. None of the 2,291 is on our shelf, though 97 non-automotive parts at 630 V or more are.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design or sourcing engineer at an automotive or EV drive electronics maker in Győr or elsewhere in Hungary. Walsin Technology (Walsin) is the manufacturer and the only line we are authorised for. We re-measured every count on 11 November 2026 from Walsin’s MLCC export, 00_ALL_MLCC_parts_combined.xlsx (24,026 rows, 23,601 distinct part numbers), and from our stock list as at 23 September 2026. Every part number is real.
What did ORIGO report about the MEBeco drive line in Győr, and why does a capacitor buyer care?
It reported a fast line getting faster. According to ORIGO on 18 October 2026, Audi Hungaria’s Győr plant was building about 1,000 to 1,200 MEBeco electric drive units a day, was preparing a third shift, and planned to reach 2,550 units a day by year-end, with one drive completed about every 27 seconds.
The same report says each drive unit carries its own power electronics, assembled in a clean room and tested at high and low voltage before shipment. Those are ORIGO’s figures, not ours. Our inference is narrow: drive power electronics use ceramic capacitors at several hundred volts for snubbing, filtering and gate-drive isolation, and an automotive programme usually asks for AEC-Q200 parts. We say nothing about what Audi, Volkswagen or any supplier buys, and we have no relationship with any of them.
How many Walsin AEC-Q200 MLCC reach 630 V and above?
One hundred and four. We counted the two Walsin series named “Qualified to AEC-Q200”, MT (2,173 part numbers) and the soft-termination ST (118), and found 104 of the 2,291 rated 630 V or more: 68 at 630 V, 29 at 1,000 V, 2 at 1,250 V and 5 at 3,000 V.
That is 3.9 percent of the 2,653 Walsin MLCC rated 630 V or more outside the safety series. The ceilings are low and they sit in specific cases:
| Rated voltage | AEC-Q200 parts | Highest X7R value | Highest NP0 value | Largest-value example | Match / mismatch with a 630 V-plus automotive brief |
|---|---|---|---|---|---|
| 630 V | 68 | 10 nF (1206) | 33 nF (1210) | MT32N333J631 |
Match on voltage and grade; mismatch above 10 nF X7R |
| 1,000 V | 29 | 100 nF (1825) | 22 nF (1210) | ST46B104K102 |
Match on voltage and grade; 1825 case only at 100 nF |
| 1,250 V | 2 | none | 10 nF (1210) | MT32N103J12E |
Match on voltage; NP0 only |
| 3,000 V | 5 | 10 nF (2220) | 100 pF (1812) | ST55B103K302 |
Match on voltage; soft termination only |
We have not seen these ceilings set out anywhere. A 1,000 V AEC-Q200 X7R at 100 nF exists only as ST46B104K102 and ST46B104M102, both in the 1825 case. Our post on AEC-Q200 MLCC: MT versus MG explains the two automotive families.
Which Walsin parts cross a 10 nF, 630 V, X7R, 1206 brief, and which are AEC-Q200?
Fourteen parts share the size, value and voltage. We filtered the export for 1206, 10 nF and 630 V and found 14 part numbers in six series: 3 AEC-Q200 MT, 1 AEC-Q200 ST, 1 MG, 4 Middle to High Voltage, 2 SG and 3 SH. One is on our shelf: 1206B103K631, a Middle to High Voltage part.
The last column is for your incumbent.
| Walsin part | Series | Dielectric | Tolerance | On shelf 23 Sep 2026 | Match / mismatch with an AEC-Q200, X7R, ±10% brief | Your incumbent |
|---|---|---|---|---|---|---|
MT31B103K631 |
MT, AEC-Q200 | X7R | ±10% | No | Match on every field | |
MT31B103M631 |
MT, AEC-Q200 | X7R | ±20% | No | Mismatch: tolerance ±20% | |
MT31N103J631 |
MT, AEC-Q200 | NP0 | ±5% | No | Mismatch: dielectric NP0, thicker at 1.60 mm | |
ST31N103J631 |
ST, AEC-Q200 soft termination | export says X7R | export says ±10% | No | Unresolved: see the next section | |
MG31B103K631 |
MG, automotive without AEC-Q200 | X7R | column reads -0.1 | No | Mismatch: not in an AEC-Q200 series | |
1206B103K631 |
Middle to High Voltage | X7R | ±10% | Yes | Mismatch: commercial grade; the nearest shelf part |
A match is a match on the export fields. The AEC-Q200 grade is in the series name; Walsin’s datasheets describe the parts as AEC-Q200 compliant, and the qualification report for the exact part number is the document to request. Our post on what AEC-Q200 actually certifies covers why.
Why does ST31N103J631 need a datasheet check before you order it?
Because its part number and its export row disagree twice. In Walsin’s ordering code the letter after the size is the dielectric, and N means NP0; the next letter is tolerance, and J means ±5%. The export row for ST31N103J631 reads X7R and ±10%, and its thickness field is blank.
We checked the whole export for the same conflict. Only 3 of 23,601 part numbers carry the N code with a dielectric other than NP0: ST31N103J631, MG18N1R6B500, and MT18N391J101, which we have published before. The likely answer is that the code is right and the row is wrong, because the neighbouring MT31N103J631 reads NP0 and ±5%, but we will not assert it. Ask Walsin’s datasheet, or ask us to.
What will we not tell you about EV drive electronics?
Anything about your inverter or your voltage class. Of the 28 Walsin datasheets we hold, 26 cover MLCC series and none names an electric drive, so every figure here is catalogue coverage, not suitability.
A rated voltage is not a working voltage, and Class II capacitance falls with applied DC voltage; our post on MLCC DC bias and voltage derating covers that. We hold no ISO 9001 or IATF 16949 certificate and make no qualification claim of our own. We hold no office, entity or stock in Hungary; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal or customs advice; confirm with your compliance team.
How can Venatech help a Hungarian automotive electronics maker?
How Venatech helps starts with a free paste box. The cross-reference tool, VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts. Paste up to 500 part numbers, or an Excel or CSV file, choose the automotive grade filter, and each Walsin candidate comes back with every field marked match or mismatch, the AEC-Q200 version listed beneath where one exists. Load a whole BOM for a review and see the MLCC range.
Our worked example: the 10 nF, 630 V, 1206 brief returned 14 parts, 1 exact AEC-Q200 match, 1 row to resolve and 1 commercial part on the shelf. 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
- 104 of 2,291 Walsin AEC-Q200 MLCC reach 630 V; at 630 V the X7R ceiling is 10 nF in 1206.
- At 1,000 V an AEC-Q200 X7R reaches 100 nF only in 1825.
- A 10 nF, 630 V, 1206 brief returns 14 parts;
MT31B103K631matches every field. ST31N103J631carries an NP0 code and an X7R row: check it.- None of the AEC-Q200 parts is on our shelf as at 23 September 2026.
Paste your high-voltage automotive capacitor lines into the free cross-reference tool and see every field marked match or mismatch. Qualification stays with you.
Frequently asked questions
What did ORIGO report about MEBeco production in Győr?
On 18 October 2026 it reported about 1,000 to 1,200 MEBeco drive units a day, a third shift in preparation and a target of 2,550 a day by year-end. These are ORIGO’s figures, not ours.
How many Walsin AEC-Q200 MLCC are rated 630 V or more?
104 of 2,291: 68 at 630 V, 29 at 1,000 V, 2 at 1,250 V and 5 at 3,000 V, counted across the MT and ST series in our export on 11 November 2026.
What is the highest AEC-Q200 X7R value at 630 V?
10 nF, in 1206, for example MT31B103K631. NP0 reaches 33 nF at 630 V in 1210. Confirm against Walsin’s datasheet before design-in.
Is a Walsin AEC-Q200 MLCC certified?
Walsin’s datasheets describe the parts as AEC-Q200 compliant, not certified. Request the qualification report for the exact part number. Venatech makes no qualification claim of its own.
Which Walsin AEC-Q200 MLCC do you hold on the shelf?
None, on our stock list as at 23 September 2026. We hold 97 non-automotive parts rated 630 V or more, such as 1206B103K631. The list is a dated snapshot; ask us through the site for to-order options.
Do you hold stock or an office in Hungary?
No. We hold no office, entity or stock in Hungary; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We hold no ISO 9001 or IATF 16949 certificate and give no legal or customs advice.
Related reading
- AEC-Q200 MLCC: MT versus MG
- What AEC-Q200 actually certifies
- Middle and high voltage MLCC, 200 V to 4 kV
- Free cross-reference tool and ready stock
Last reviewed 11 Nov 2026. Sources: ORIGO, “A harmadik műszakra készül az Audi Hungaria MEBeco üzeme”, 18 October 2026 (https://www.origo.hu/auto/2026/10/audi-hungaria-harmadik-muszakra-keszul-mebeco-uzem, fetched 11 Nov 2026); Walsin MLCC export and Venatech stock list as at 23 September 2026, re-measured 11 Nov 2026.