Electric two-wheeler electronics for India need automotive-grade ceramics, and the Walsin Technology (Walsin) catalogue holds 3,066 in the MT, MG and ST series. Only 21 are 100 nF, X7R and 100 V or more, 5 of those are in the series that is not AEC-Q200, and none of the 3,066 is on our Hong Kong shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this from the Venatech upload files for Walsin MLCC (23,360 rows, 23,360 distinct part numbers) and our stock list as at 23 September 2026. It is for a design or sourcing engineer at an Indian maker of electric two-wheelers, battery packs or motor controllers who is choosing a 100 nF capacitor with margin on a pack or bus voltage. Every part number is real and every count is ours. The market fact names its source and the day we fetched it, 10 November 2026.
What did Chennai and Tamil Nadu report about electric vehicle registrations?
They reported steady growth, with Chennai electric two-wheelers up in two years. According to DT Next on 24 March 2026, citing Vahan data tabled in the Lok Sabha on 19 March 2026, Chennai registered 15,395 electric two-wheelers in 2025, up from 13,630 in 2023, while Tamil Nadu’s total electric vehicle registrations rose from 90,305 in 2023 to 174,477 in 2025.
Those are the newspaper’s figures, not ours, and they count registrations, not factory output. Our reading is ours: each of those scooters carries a battery management board, a motor controller and a charger input, and each needs decoupling capacitors with margin on its bus voltage. We have no relationship with any Indian maker and say nothing about what any of them buys.
How many Walsin automotive-series capacitors are there, and are they all AEC-Q200?
Three thousand and sixty-six, and not all of them. We counted the three automotive-named series in the Venatech upload files: 2,167 in the MT series, 783 in the MG series, which Walsin names Without AEC-Q200 Certification, and 116 in the ST soft-termination series; none of the 3,066 is on our stock list as at 23 September 2026.
About a quarter of the automotive-named parts are therefore not qualified to AEC-Q200. A search for automotive MLCC that returns the MG series will return parts that carry the name and not the qualification. Our post on MT versus MG series explains the split, and what AEC-Q200 actually certifies explains why Walsin says compliant, not certified, and why you should ask for the qualification report.
How many 100 nF, X7R parts with 100 V or more are in the automotive series?
Twenty-one, in three series. In the Venatech upload files, 21 automotive-series part numbers are 100 nF, X7R and rated 100 V or higher: 7 in the MT series, 5 in the MG series and 9 in the ST series, in sizes from 0603 to 1825.
At 0603 there are 4 (1 MT and 3 ST) and at 0805 there are 4 (2 MT, 1 MG and 1 ST), all at 100 V; the 1206 size holds 9, including 200 V and 250 V parts, and 1825 holds 2 at 1000 V. If your pack bus is 48 V or 60 V, a 100 V rung is the first one with margin, but derating on a ceramic is a design decision. See MLCC DC bias and voltage derating.
Why does the MG tolerance column look wrong?
Because it holds a negative decimal. Of the 783 MG-series part numbers, 651 carry a tolerance such as -0.1, -0.05, -0.01, -0.2 or -0.02 in the export, while all 2,167 MT-series rows carry a plus or minus value.
We have not seen this counted anywhere. The pattern reads like a plus or minus percentage that was parsed as a number, so -0.1 probably stands for plus or minus 10 percent, but we do not know that, and the description string repeats it, for example 100pF -0.05 16V X7R MLCC 0402. A tolerance filter that looks for plus or minus 10 percent will miss MG parts. Read the part number’s tolerance letter and the Walsin datasheet, not the column.
Which Walsin parts cross a 100 nF, 100 V, X7R, 0603, plus or minus 10 percent, AEC-Q200 brief, and what differs?
One matches the whole brief. MT18B104K101 is the only automotive part that matches a 100 nF, 100 V, X7R, 0603, plus or minus 10 percent brief on every export field we hold, and it sits in the MT series Walsin lists as AEC-Q200.
The reader’s incumbent goes in the last column.
| Walsin part | Description | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|
MT18B104K101 |
MT series, 0603, X7R, 100 nF, plus or minus 10 percent, 100 V | No | Match on size, dielectric, value, tolerance and voltage | |
ST18B104K101 |
ST soft termination, 0603, X7R, 100 nF, plus or minus 10 percent, 100 V | No | Match on the electrical fields; mismatch: soft termination | |
ST18B104J101 |
ST soft termination, 0603, X7R, 100 nF, plus or minus 5 percent, 100 V | No | Mismatch: tolerance is plus or minus 5 percent, tighter | |
MT21B104K101 |
MT series, 0805, X7R, 100 nF, plus or minus 10 percent, 100 V | No | Match on the electrical fields; mismatch: 0805 body | |
MG21B104K101 |
MG series, 0805, X7R, 100 nF, tolerance printed -0.1, 100 V | No | Mismatch: 0805 body, not AEC-Q200, tolerance field unclear |
A match in the table is a match on the export fields, no more. Confirm against both datasheets and qualify in your own circuit, and ask for the qualification report for the exact part number.
What does the Hong Kong shelf hold in automotive capacitors?
None of the three series. Our stock list as at 23 September 2026 holds 1,125 distinct part numbers, and none of the 3,066 MT, MG and ST part numbers is among them.
Every automotive MLCC line is therefore a to-order enquiry from us today. That is a fact about our shelf, not about Walsin’s availability, and we make no lead-time promise. The ready stock list is a dated snapshot, never live-synced, and the MLCC range lists the families. Ask us through the site, with the series and the tolerance letter.
What will we not tell you about electric two-wheelers?
Anything about your pack, your controller or your qualification plan. Of the 28 Walsin datasheets we hold, 26 cover MLCC series, but none names an electric two-wheeler, so every count here is catalogue coverage, not suitability.
We make no claim that any part suits a scooter, a pack voltage or a vibration profile. Walsin’s datasheets say compliant with AEC-Q200, not certified; we make no qualification claim of our own. We hold no ISO 9001 or IATF 16949 certificate. We give no legal, customs or conformity advice; confirm with your compliance team.
How can Venatech help a Chennai designer?
How Venatech helps starts with a free paste box. The cross-reference tool, called VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts; paste up to 500 part numbers or an Excel or CSV file and each Walsin candidate returns with every field marked match or mismatch, with the grade filter for commercial or automotive. Load a whole BOM for a review. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.
Worked example from our own files: the 100 nF, 100 V, 0603 brief returned 1 exact part among 4 at the size, none stocked. Venatech Limited is an authorised Walsin Technology distributor in Hong Kong; Stackpole and Viking are lines we supply. We serve from Hong Kong, welcome small lots, and you request a quote through the site.
The short version
For an Indian electric two-wheeler designer, an automotive 100 nF capacitor is a series question: 3,066 parts in MT, MG and ST, 21 at 100 nF, X7R and 100 V or more, 5 of them not AEC-Q200, and none on the shelf. Name the series, the grade and the tolerance letter.
Send us one automotive capacitor line from your BOM, with the voltage, size, grade and tolerance you can accept, and we will return the Walsin parts with every difference stated. If your incumbent is AEC-Q200, do you know which Walsin series carries that qualification?
Sources
Fetched 10 November 2026.
- DT Next, Tamil Nadu adoption of EVs surges in urban centres, two-wheelers lead the chart (Vahan data tabled in the Lok Sabha on 19 March 2026), 24 March 2026: https://www.dtnext.in/news/tamilnadu/tamil-nadu-adoption-of-evs-surge-in-urban-centres-two-wheelers-lead-chart
Related reading
- AEC-Q200 MLCC: MT versus MG series
- What AEC-Q200 actually certifies
- MLCC DC bias and voltage derating
- Free cross-reference tool (VenaMatch)
- Ready stock, Hong Kong snapshot dated 23 September 2026
Last reviewed 10 Nov 2026.
Frequently asked questions
How many electric two-wheelers did Chennai register in 2025?
DT Next reported on 24 March 2026, citing Vahan data tabled in the Lok Sabha on 19 March 2026, that Chennai registered 15,395 electric two-wheelers in 2025, up from 13,630 in 2023. These are the newspaper’s figures, not ours.
How many Walsin automotive-named capacitors are there?
3,066 distinct part numbers in the Venatech upload files: 2,167 MT, 783 MG and 116 ST. The MG series is named Without AEC-Q200 Certification by Walsin. None is on our stock list as at 23 September 2026.
Which Walsin 100 nF, 100 V, X7R automotive parts exist?
21: 7 MT, 5 MG and 9 ST, from 0603 to 1825. Only MT18B104K101 matches a 0603, plus or minus 10 percent brief on every export field. Confirm against the datasheet and request the qualification report.
Why does the MG series tolerance column show negative numbers?
651 of 783 MG rows print a value such as -0.1 instead of a plus or minus percentage. We infer a parsing artefact but have not confirmed it. Check the tolerance letter in the part number and the Walsin datasheet.
Is the MG part a drop-in for an AEC-Q200 MT part?
No. MG21B104K101 matches the electrical fields of MT21B104K101 at 100 nF and 100 V in 0805, but the MG series is not AEC-Q200 per Walsin’s naming. Qualify in your own circuit.
Do you hold stock or an office in India?
No. Our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation, and no automotive-series part is on the shelf. We hold no ISO 9001 or IATF 16949 certificate and give no legal, customs or conformity advice. Confirm with your compliance team.