For a 100V MLCC on a 48 V AI server rail in Mexico, Walsin Technology (Walsin) lists 3,089 part numbers rated 100 V, 82 of them X7R at 1 µF or more. A 1210, 2.2 µF brief returns 10. Venatech Limited, an authorised Walsin distributor in Hong Kong, held 56 of the 100 V lines on its shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for power and sourcing engineers in Ciudad Juárez and northern Mexico who build or second-source the 48 V input, bus-converter and hot-swap stages of AI and general-purpose servers. We parsed the Walsin MLCC export 00_ALL_MLCC_parts_combined.xlsx (24,026 rows, 23,601 distinct part numbers) and our ready-stock list as at 23 September 2026. Every part number is real, and the market facts come from one report fetched on 11 November 2026.
What is Inventec building in Ciudad Juárez?
A 450 million US dollar expansion. According to Mexico News Daily on 4 August 2026, Taiwanese server and AI hardware maker Inventec announced an expansion of 450 million US dollars in Ciudad Juárez, Chihuahua, expected by the state government to create up to 6,000 specialised jobs.
The report adds that Mexico’s computer hardware exports rose more than 35% year on year in the first half of 2026, with AI servers a significant share of the increase. Those are the report’s figures, not ours. Our conclusion: AI servers draw power from 48 V or higher racks, and every board on that bus needs ceramic capacitors rated well above 48 V. We have no relationship with Inventec and say nothing about what it buys.
How many 100V MLCC does Walsin list?
3,089 distinct part numbers. We counted every row of 00_ALL_MLCC_parts_combined.xlsx rated 100 V and found 3,089 distinct Walsin MLCC: 2,162 C0G, 854 X7R, 67 X8G and a handful of X5R, X6S and X7S parts, from 0201 to 2225.
For bulk decoupling on a 48 V bus, the X7R parts at 1 µF or more are the ones that matter. We counted 82: 14 in 1206, 25 in 1210, 14 in 1812, 22 in 2220, 5 in 2225 and 2 in 1825. Our guide to passives for AI server power stages maps where each sits, and the MLCC range lists every family.
Which Walsin 1210, 2.2 µF, 100V MLCC cross a 48 V bus brief?
Ten part numbers in five series. We filtered the 100 V rows to 1210, 2.2 µF and X7R and found 10 Walsin part numbers: three general-purpose, three SH soft-termination, one TT low-profile, one MT AEC-Q200 and two ST AEC-Q200 soft-termination parts.
The table takes a common bus-converter input brief, 1210, 2.2 µF, X7R, plus or minus 10%, 100 V, and shows the closest rows. Your incumbent goes in the last column.
| Walsin part | Series | Tolerance | Thickness (mm) | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|
1210B225K101 |
General Purpose | ±10% | 2.50 ±0.50 | Match on every field; on our shelf | |
SH32B225K101 |
SH soft termination | ±10% | 2.50 ±0.50 | Match, adds flex-crack protection | |
TT32B225K101 |
TT low profile | ±10% | 2.50 ±0.50 | Match | |
MT32B225K101 |
MT (AEC-Q200) | ±10% | 2.50 ±0.50 | Match, automotive grade | |
ST32B225K101 |
ST (AEC-Q200, soft term.) | ±10% | 2.50 ±0.50 | Match, automotive and soft termination | |
1210B225J101 |
General Purpose | ±5% | 2.50 ±0.50 | Match, tighter tolerance | |
1210B225M101 |
General Purpose | ±20% | 2.50 ±0.50 | Mismatch: tolerance is wider |
A match is a match on export fields. X7R loses capacitance under DC bias, so take the bias curve at your bus voltage from Walsin’s datasheet before you count parts.
Why put a 100V MLCC on a 48 V server rail?
Because a 48 V rail is not a 48 V event. A nominal 48 V server bus runs to about 54 V in normal operation and rings higher at hot-plug, so a 100 V MLCC keeps the working voltage near half its rating, where X7R keeps more of its capacitance and transients stay inside the part’s limits.
A 63 V or 80 V part can work on paper, but the margin is thin and the DC-bias loss is larger at the same working voltage. That is why many 48 V designs standardise on 100 V ceramics at the input and hot-swap, and keep lower ratings for the 12 V side. Our guide to MLCC DC bias and voltage derating shows how to set the margin for your own rack.
Which Walsin 100V MLCC are on the Hong Kong shelf?
Fifty-six lines. We matched the 3,089 parts against our ready-stock list as at 23 September 2026 and found 56 Walsin 100 V lines on the shelf, 36 of them X7R, from 0201 to 2220 and from 0.5 pF to 2.2 µF.
| Walsin part on the shelf | Size | Dielectric | Capacitance |
|---|---|---|---|
1210B225K101 |
1210 | X7R | 2.2 µF |
1210B105K101 |
1210 | X7R | 1 µF |
2220B474K101 |
2220 | X7R | 470 nF |
1206B104K101 |
1206 | X7R | 100 nF |
0805B104K101 |
0805 | X7R | 100 nF |
0603B104K101 |
0603 | X7R | 100 nF |
Those cover the bulk, mid-frequency and high-frequency positions of one 48 V input. The ready-stock list is a dated Hong Kong snapshot, never live-synced; for any other part, request a quote and we source it through our authorised Walsin channel. We give no stock or lead-time promise.
How can Venatech help a server electronics maker in Mexico?
How Venatech helps: cross the BOM, quote the gaps fast. Venatech Limited is the authorised Walsin distributor in Hong Kong, and VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, field by field.
Paste up to 500 part numbers into the cross-reference tool, or upload a whole BOM. We serve small lots from Hong Kong, quote fast and help you check each cross; request a quote through the site. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply. We give no USMCA, customs or tariff advice; confirm with your compliance team.
The short version
Ciudad Juárez is adding AI server capacity, and every 48 V board needs ceramics with real voltage margin. Walsin covers that with 3,089 MLCC rated 100 V, 82 of them X7R at 1 µF or more; a 1210, 2.2 µF brief returns 10 part numbers, and 56 of the 100 V lines were on our Hong Kong shelf as at 23 September 2026.
Send us the 48 V capacitor lines from your BOM, and we will return the Walsin rows with every field marked. What is the highest voltage your input rail rings to at hot-plug?
Related reading
- Passives for AI server power stages
- MLCC DC bias and voltage derating
- Middle and high voltage MLCC from 200 V to 4 kV
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Mexico News Daily, “Taiwanese AI firm Inventec announces 450M expansion in Ciudad Juárez”, 4 August 2026: https://mexiconewsdaily.com/business/inventec-ai-technology-expansion-mexico/
Frequently asked questions
What is Inventec investing in Ciudad Juárez, Mexico?
Mexico News Daily reported on 4 August 2026 that Inventec announced an expansion of 450 million US dollars in Ciudad Juárez, expected to create up to 6,000 specialised jobs. These are the report’s figures.
How many 100V MLCC does Walsin make?
We counted 3,089 distinct Walsin MLCC rated 100 V: 2,162 C0G, 854 X7R and 67 X8G, with a few others. 82 are X7R at 1 µF or more.
Which Walsin part matches a 1210, 2.2 µF, X7R, 100 V capacitor?
1210B225K101 matches on every export field, SH32B225K101 adds soft termination, and MT32B225K101 is the AEC-Q200 option. Check DC bias at your bus voltage against Walsin’s datasheet.
Why use 100 V capacitors on a 48 V server bus?
The bus runs to about 54 V and rings higher at hot-plug. A 100 V part keeps working voltage near half its rating, which limits DC-bias loss and leaves transient margin.
Does Venatech stock 100V MLCC in Hong Kong?
As at 23 September 2026 our snapshot held 56 Walsin 100 V lines, 36 of them X7R, including 1210B225K101. For other parts, request a quote; we make no lead-time promise.
Can Venatech supply EMS plants in Mexico?
Yes. Venatech Limited is an authorised Walsin distributor in Hong Kong, serving buyers in Mexico in small lots. We give no customs or tariff advice.