An AEC-Q200 MLCC at 100 nF, 100 V, 1206, X7R has 6 Walsin Technology (Walsin) candidates for automotive makers in Japan: 3 in the MT series and 3 in the soft-termination ST series. Walsin flex-tests ST to 5 mm of board deflection and MT X7R to 2 mm. None of the 6 is on our shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for design and sourcing engineers at automotive electronics makers and tier suppliers in Japan, with Aichi’s vehicle cluster in mind. We parsed the Walsin MLCC export 00_ALL_MLCC_parts_combined.xlsx (24,026 rows, 23,601 distinct part numbers), read the MT and ST approval sheets 11_Automotive_MT.pdf and 12_Soft_Term_Automotive_ST.pdf, and checked our stock list as at 23 September 2026. Every part number is real. Sources were fetched on 11 November 2026.
Why does an Aichi automotive electronics maker care about an AEC-Q200 MLCC at 1206?
Because Aichi builds vehicles at volume, and a 1206 capacitor near a connector or a screw boss is where board flex cracks start. SteelOrbis reported on 30 October 2026 that Toyota’s domestic output rose 5.8 percent to 319,195 units in September 2026, while its global output for January to September fell 2.1 percent to 7,282,386 units.
Those are the report’s figures, not ours. Toyota’s release is datelined Toyota City, and Toyota’s own facilities page lists its Meiko Center shipping facility in Tokai City, Aichi Prefecture, and its Honsha Plant as making hybrid-system parts. We have no relationship with Toyota and say nothing about what it buys. Our point is narrower: in a 12 V or 48 V module, a 100 V, 100 nF X7R in 1206 is a common filter and snubber line, and the termination choice matters as much as the value.
How many Walsin parts answer a 100 nF, 100 V, 1206 X7R brief?
Fourteen part numbers in 18 rows. We filtered the export for X7R, 100 nF, 100 V and 1206 and found 18 rows holding 14 distinct part numbers in 6 series: General Purpose 3, SH soft termination 3, SG soft termination 1, MT 3, MG 1 and ST 3.
Six of the 14 are in AEC-Q200 series, MT and ST. The MG part, MG31B104K101, is in Walsin’s series named “Automotive Caps Without AEC-Q200 Certification”, and its Tolerance cell reads -0.1 rather than a percentage. The other eight are commercial. The difference between “automotive” and “AEC-Q200” in Walsin’s own naming is the first filter to apply; our AEC-Q200 MLCC: MT vs MG series post sets it out.
Which AEC-Q200 MLCC parts cross the brief, and what differs?
All six match electrically; termination and tolerance separate them. For a 100 nF, plus or minus 10 percent, 100 V, 1206 X7R brief, MT31B104K101 and ST31B104K101 both match every export field; the ST part adds soft termination, which Walsin’s approval sheet flex-tests to 5 mm against 2 mm for MT X7R.
| Walsin part | Series | Tolerance, thickness | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|
ST31B104K101 |
ST, soft termination, AEC-Q200 | ±10%, 1.25 mm | No | Match; flex-tested to 5 mm | |
MT31B104K101 |
MT, AEC-Q200 | ±10%, 1.25 mm | No | Match; X7R flex-tested to 2 mm | |
ST31B104J101 |
ST, soft termination, AEC-Q200 | ±5%, 1.25 mm | No | Match; tighter tolerance | |
MT31B104M101 |
MT, AEC-Q200 | ±20%, 1.25 mm | No | Mismatch: ±20 percent | |
MG31B104K101 |
MG, without AEC-Q200 | cell reads -0.1 | No | Mismatch: not an AEC-Q200 series | |
1206B104K101 |
General Purpose | ±10%, 0.95 or 1.25 mm | Yes | Mismatch: commercial grade |
Walsin’s sheets say the MT and ST series are AEC-Q200 compliant; that is not a certificate. Request the qualification report for the exact part number. Confirm against both datasheets and qualify in your own circuit.
What does soft termination buy you on a flexing board?
More deflection before damage, by Walsin’s own test. Walsin’s ST approval sheet, dated September 2026, runs its board-flex test to a 5 mm deflection; the MT approval sheet runs 3 mm, and 2 mm for X7R.
A polymer layer inside the ST termination absorbs bending stress, which is why the deflection limit is higher. That helps near connectors, mounting holes and panel break-out tabs, where flex cracks in ceramic capacitors start. It does not replace good layout: keep 1206 parts away from board edges and orient them parallel to the bend line. Both sheets are linked from our index: ST and MT. Our soft termination MLCC guide compares the four soft-termination families.
Why does the same part number appear at two thicknesses?
Because the export lists it twice. We found 4 of the 14 part numbers on two rows each: 1206B104K101, 1206B104M101 and 1206B104J101 at 0.95 mm and 1.25 mm, and SH31B104K101 at 0.95 mm and 1.25 mm.
The part number alone does not tell you the height. If your enclosure, conformal-coat clearance or stencil depends on it, confirm the thickness with the order, not from the code. None of the six AEC-Q200 parts is duplicated; all six read 1.25 mm.
What does the Hong Kong shelf hold for this brief?
One commercial line. Of the 14 part numbers, only 1206B104K101, the General Purpose part, is on our stock list as at 23 September 2026; none of the 3,076 Walsin parts in the MT, MG and ST automotive series is on the shelf.
So the shelf answers a prototype or a non-automotive board, not an AEC-Q200 build. The ready-stock list is a dated snapshot, not live, and the MLCC range lists the families. Ask for ST or MT parts by exact number.
What will we not tell you about automotive qualification?
Whether a part passes your PPAP, your OEM’s specification or your environmental profile. Of the 26 Walsin MLCC datasheets we hold, none names a vehicle maker, so every count here is catalogue coverage, not approval.
Venatech makes no qualification claim of its own. We give no price, lead time or stock promise. We hold no ISO 9001 or IATF 16949 certificate. Our locations are Hong Kong, Shenzhen, Singapore and Jiangmen; we hold no office or stock in Japan. We give no customs or conformity advice; confirm with your compliance team.
How can Venatech help an automotive electronics maker in Japan?
How Venatech helps: the free cross-reference tool, VenaMatch, decodes 18 manufacturers’ part numbers across 800,000+ crossable parts, with a grade filter for commercial or automotive. Paste up to 500 part numbers or load a BOM, and each line returns Walsin candidates with the AEC-Q200 version listed where one exists and every difference stated.
The ready-stock list is a Hong Kong snapshot dated 23 September 2026. We serve from Hong Kong in small lots and you request a quote through the site. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply.
The short version
For 100 nF, 100 V, 1206 X7R, Walsin offers 14 part numbers; 6 are AEC-Q200 (3 MT, 3 ST). ST is flex-tested to 5 mm, MT X7R to 2 mm. Only the commercial 1206B104K101 is on our shelf.
Send us your 1206 capacitor lines near connectors and mounting holes, and we will return the AEC-Q200 Walsin parts with every difference stated.
Sources
Fetched 11 November 2026.
- SteelOrbis, “Toyota’s global vehicle output and sales decrease in Jan-Sept 2026”, 30 October 2026: https://www.steelorbis.com/steel-news/latest-news/toyotas-global-vehicle-output-and-sales-decrease-in-jan-sept-2026-1487206.htm
- Toyota, production, sales and export results release, Toyota City, 29 October 2026: https://global.toyota/en/company/profile/production-sales-figures/202609.html
- Toyota, manufacturing facilities in Japan (Meiko Center, Tokai City, Aichi Prefecture): https://global.toyota/en/company/profile/facilities/manufacturing-worldwide/japan.html
- Toyota, plants in Japan (Honsha Plant, hybrid-system parts): https://global.toyota/en/company/profile/facilities/manufacturing-jp/
- Walsin ST and MT approval sheets (links above) and the MLCC export
00_ALL_MLCC_parts_combined.xlsx, with the Venatech stock list as at 23 September 2026, re-measured 11 November 2026 (internal files).
Related reading
- AEC-Q200 MLCC: MT vs MG series
- Soft termination MLCC: SH, SG, ST and VT
- What AEC-Q200 actually certifies
- Free cross-reference tool (VenaMatch)
- Ready stock, Hong Kong snapshot dated 23 September 2026
Last reviewed 11 Nov 2026.
Frequently asked questions
Which Walsin AEC-Q200 MLCC parts are 100 nF, 100 V, 1206 X7R?
Six: MT31B104K101, MT31B104M101 and MT31B104J101 in the MT series, and ST31B104K101, ST31B104M101 and ST31B104J101 in the soft-termination ST series. Walsin describes both series as AEC-Q200 compliant; request the qualification report for your exact part.
What board-flex deflection do Walsin ST and MT capacitors withstand in test?
Walsin’s ST approval sheet runs its board-flex test to 5 mm of deflection. The MT approval sheet runs 3 mm, and 2 mm for X7R. Confirm the full test conditions in each sheet before you rely on them.
Is the Walsin MG series AEC-Q200?
Walsin’s own series name for MG is “Automotive Caps Without AEC-Q200 Certification”. For an AEC-Q200 requirement, use MT or ST. The MG part in this brief, MG31B104K101, also shows -0.1 in its Tolerance cell.
Why does 1206B104K101 appear twice in the Walsin export?
It is listed at two thicknesses, 0.95 mm and 1.25 mm, under one part number. Three other part numbers in this brief do the same. Confirm the height with your order if your enclosure or stencil depends on it.
Do you hold AEC-Q200 MLCC stock in Hong Kong?
None of the 3,076 Walsin MT, MG and ST part numbers was on our stock list as at 23 September 2026. The snapshot is dated, not live. Ask through the site; we give no stock or lead-time promise.
Do you have an office or stock in Japan?
No. Our locations are Hong Kong, Shenzhen, Singapore and Jiangmen; we hold no office or stock in Japan. We give no customs or conformity advice and make no qualification claim; confirm with your compliance team.