The Walsin General Purpose sheet does not give one MLCC measurement voltage for Class II parts. It prints five levels, 1, 0.5, 0.3, 0.2 and 0.1 V, in a table on page 14. We mapped all 3,672 Class II export rows to it: 3,089 sit at 1 V, 120 are footnoted exceptions, and 163 have no level at all.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds 28 datasheets from Walsin Technology (Walsin), 451 pages in all. This post is written from 01_General_Purpose.pdf, 21 pages, dated Sep. 2026, and from the 8,467 General Purpose rows of 00_ALL_MLCC_parts_combined.xlsx. We opened the sheet, read the measurement-voltage table cell by cell and joined it to every Class II row by case size, capacitance, dielectric letter and rated voltage. Every part number below is real. The question is the one a test engineer asks when two suppliers quote different capacitance for the same part: at what voltage was it measured?
How many measurement voltages does the General Purpose sheet print for Class II parts?
Five, in a table, and the sheet prints two more windows elsewhere. On page 14, under “Measurement voltage for Class II”, we read 1 V, 0.5 V, 0.3 V, 0.2 V and 0.1 V. They are set by case size and capacitance: six size bands, 01005, 0201, 0402, 0603, 0805 and 1206/1210, with ten footnote marks, * to *9, naming individual part families that depart from the band. On page 12 the reliability section says something shorter: 1.0 plus or minus 0.2 Vrms at 1 kHz up to 10 µF, and 0.5 plus or minus 0.2 Vrms at 120 Hz above it.
The table writes its unit as “V”. The reliability text writes “Vrms”. The two windows on page 12 span 0.8 to 1.2 V and 0.3 to 0.7 V. 0.2 V and 0.1 V sit outside both. We read that as a mismatch between two statements in one PDF, and we count the rows it touches below.
How many of the 3,672 Class II export rows land on each level?
Most land on 1 V, and one row in 23 does not land anywhere. We separated the 4,795 NP0 rows, which the table does not cover, from the 3,672 rows in X7R, X5R, X6S, X7S and Y5V. We then applied each band and each footnoted exception: 3,089 rows (84.1 percent) fall at 1 V, 305 at 0.5 V, 22 at 0.3 V, 76 at 0.2 V, 17 at 0.1 V, and 163 have no band.
| Case size | Class II rows | At 1 V | At 0.5 V | At 0.3 V | At 0.2 V | At 0.1 V | No level | Real part at the lowest level | Match / mismatch against the 1.0 ± 0.2 Vrms rule on page 12 |
|---|---|---|---|---|---|---|---|---|---|
| 0201 | 437 | 348 | 50 | 22 | 11 | 6 | 0 | 0201X105M4R0 |
Mismatch on 17 rows at 0.2 V or 0.1 V |
| 0402 | 642 | 566 | 45 | 0 | 22 | 9 | 0 | 0402X106M6R3 |
Mismatch on 31 rows |
| 0603 | 798 | 679 | 101 | 0 | 17 | 1 | 0 | 0603S226M6R3 |
Mismatch on 18 rows |
| 0805 | 712 | 656 | 37 | 0 | 19 | 0 | 0 | 0805X106K6R3 is at 0.5 V |
Mismatch on 19 rows |
| 1206 | 616 | 582 | 30 | 0 | 3 | 1 | 0 | 1206A476M6R3 |
Mismatch on 4 rows |
| 1210 | 304 | 258 | 42 | 0 | 4 | 0 | 0 | 1210S107M6R3 is at 0.2 V |
Mismatch on 4 rows |
| 1812 | 160 | 0 | 0 | 0 | 0 | 0 | 160 | 1812B104K101 |
Mismatch — the table has no 1812 band |
| 0306 | 3 | 0 | 0 | 0 | 0 | 0 | 3 | 0306B225J4R0 |
Mismatch — not in the table or the ordering key |
We have not seen this counted anywhere: 93 Class II rows, 2.5 percent, are assigned 0.2 V or 0.1 V by the table, a level outside both windows that the reliability section prints. The sizes below 1206 carry 85 of them. The rows with capacitance above 10 µF are only 110 of the 3,672, so the low levels are not confined to the large-capacitance corner the 120 Hz clause was written for.
Which rows does the sheet pull out as exceptions?
120 rows, 3.3 percent of Class II, in 22 part families that match at least one export row. We coded every footnoted line on page 14 as a rule on case size, dielectric letter, capacitance and voltage, and counted the export rows each rule catches. The 0201 size carries 72 of the 120, and in every case the exception changes the level the band would give.
| Footnote | Part families named | Level the band would give | Level the footnote gives | Export rows | Match / mismatch against the band |
|---|---|---|---|---|---|
* |
0201 X 27 to 82 nF, 6.3 to 16 V; X 47 nF 25 V; S 27 to 82 nF, 6.3 to 10 V | 1 V | 0.5 V | 33 | Mismatch |
*1 |
0201 X, B and S, 100 to 470 nF at various voltages | 0.2 V | 0.5 V or 0.3 V | 35 | Mismatch |
*2 |
0201 X 1 µF, 6.3 and 10 V | 0.1 V | 0.3 V | 4 | Mismatch |
*3 |
0402 B 220 nF 16 V; B 330 and 470 nF; S 330 and 470 nF | 1 V | 0.5 V | 19 | Mismatch |
*4 |
0402 B 1 µF 6.3 V | 0.5 V | 0.2 V | 3 | Mismatch |
*5 |
0402 X 2.2 and 4.7 µF 6.3 V | 0.2 V | 0.5 V | 6 | Mismatch |
*6 |
0603 B 1 µF 35 V | 0.5 V | 1 V | 3 | Mismatch |
*7 |
0603 X 10 µF 10 V; S 22 µF 6.3 V | 0.2 V | 0.5 V or 0.1 V | 3 | Mismatch |
*8 |
0805 B 4.7 µF 6.3 to 25 V | 1 V | 0.5 V | 10 | Mismatch |
*9 |
1206 X 100 µF, 1206 A 47 µF, 1210 S 100 µF, all 6.3 V | 0.5 V | 0.2 V or 0.1 V | 4 | Mismatch |
Of the 1,125 part numbers in the 23 September 2026 ready stock snapshot, 287 are General Purpose Class II parts that appear in this export. 14 of them are footnoted exceptions, for example 0402X225M6R3 and 0603X106K100, and 4 have no level at all. The snapshot is dated; it is not a live feed.
Which Class II rows have no measurement voltage at all?
163, and 160 of them are 1812. The sheet lists 1812 on its first page, in the features line, in the ordering key and in the general electrical data table, and prints capacitance grids for it. Its measurement-voltage table stops at “1206/1210”. The 160 General Purpose 1812 rows, such as 1812B104J101 and 1812B154K500, therefore have only the page-12 rule to go on. Three more rows, 0306B225J4R0, 0306B225K4R0 and 0306B225M4R0, sit at a size that is in neither the table nor the ordering key, a gap we already counted in our ordering key post.
We are not saying the 1812 parts are measured wrongly. We are saying the sheet does not tell you. The export has 16 columns and none of them is a measurement condition, so the answer is not in the parametric data either.
Do the other Class II sheets print a table or a rule?
A rule, on five of the six others. Seven of the 12 sheets cover a Class II dielectric: the General Purpose, Ultra-small 01005, Large Size, Middle and High Voltage, Surface Coating, Automotive MT and Soft Term Automotive ST sheets. Only the General Purpose and the Ultra-small sheets print a level table. The Large Size, Surface Coating, MT and ST sheets give 1.0 ± 0.2 Vrms at 1 kHz up to 10 µF and 0.5 ± 0.2 Vrms at 120 Hz above it. The Middle and High Voltage sheet gives 1.0 ± 0.2 Vrms at 1 kHz and nothing for the large capacitances.
| Sheet | How Class II measurement voltage is stated | Export Class II rows | Match / mismatch against the General Purpose table |
|---|---|---|---|
01_General_Purpose |
5-level table by size and capacitance, plus a page-12 rule | 3,672 | reference |
02_Ultra_Small_01005 |
2-level table: 0.5 V up to 10 nF, 0.2 V above; plus a clause for X5R | 41, of which 28 are at 0.5 V and 13 at 0.2 V | Match on the 01005 band; the X5R clause quotes 0.5 or 1.0 ± 0.2 Vrms, so 0.2 V is a mismatch inside this sheet |
03_Large_Size_1825_2220_2225, 05_Surface_Coating_Type, 11_Automotive_MT, 12_Soft_Term_Automotive_ST |
1.0 ± 0.2 Vrms to 10 µF, 0.5 ± 0.2 Vrms at 120 Hz above | no 1 V or 0.5 V table | Mismatch — two levels, no size dependence |
04_Middle_and_High_Voltage |
1.0 ± 0.2 Vrms at 1 kHz, no 120 Hz clause | no table | Mismatch — one level only |
The 01005 numbers are the one place two sheets agree: the General Purpose table’s 01005 band and the Ultra-small sheet’s table both read 0.5 V up to 10 nF and 0.2 V above. Walsin’s 01005 parts sit in the Ultra-small series in the export, with 41 Class II rows, so the General Purpose export holds no 01005 row for that band to describe.
What should you ask before comparing two capacitance values?
The measurement voltage and frequency written on the sheet for that exact part, because a figure measured under a different condition is a figure for a different test. For a General Purpose Class II part, find the case size, capacitance and voltage in the page-14 table, check whether a footnote names your part, and then decide whether the page-12 rule is the one you will use in incoming inspection. For an 1812, ask Walsin. We hold 28 Walsin datasheets, 451 pages, and will send the sheet for your part number.
Our free cross-reference tool matches on the fields the export carries and states differences from your original part, and the measurement voltage is not one of those fields. For how the capacitance test frequency is stated across the other sheets, read our post on capacitance test conditions, and for the DC side of the same question, DC bias and voltage derating. The capacitor range sits on the MLCC page. Qualification stays with you.
The short version
The General Purpose sheet prints five Class II measurement voltages in a table on page 14 and two windows in a rule on page 12. 3,089 of 3,672 Class II rows sit at 1 V, 120 are footnoted exceptions, 93 are assigned 0.2 V or 0.1 V outside both windows, and 163 have no level because the table stops at 1206/1210. Of the 12 sheets, 7 cover Class II and only 2 print a table. We will not tell you two capacitance values are comparable. We will show you the voltage the sheet puts behind each. Confirm against both datasheets and qualify in your own circuit.
Send us the part number and the measurement condition on your incoming-inspection plan, and we will tell you which line of the sheet it falls under. And a question back: if your supplier’s certificate states 1 V and the table says 0.2 V, which of the two did your test house use?
Frequently asked questions
What measurement voltage does Walsin use for Class II MLCC capacitance?
It depends on the sheet. The General Purpose sheet prints five levels from 1 V to 0.1 V by case size and capacitance, on page 14. Four other sheets state 1.0 plus or minus 0.2 Vrms to 10 µF. Of 3,672 General Purpose Class II rows, 3,089 are at 1 V by the table.
Why does the General Purpose sheet have footnoted exceptions?
We cannot say; the sheet does not give a reason. The page lists part families, such as 0201 X 27 to 82 nF at 6.3 to 16 V, whose level differs from the band. They catch 120 of the 3,672 Class II export rows, 3.3 percent, and 72 of those are 0201.
Does the export hold the measurement voltage?
No. The export has 16 columns across 24,026 rows: Part Number, Series, Size, Dielectric, Capacitance, Tolerance, Rated Voltage, L, W, T, Termination, Packing, SPQ, Remark, Thickness and Symbol. None of them states a measurement voltage or frequency, so the condition is available from the datasheet only.
Which Class II rows have no stated measurement voltage?
163 of the 3,672: 160 at 1812 and 3 at 0306. The measurement-voltage table stops at the 1206/1210 band. The 1812 parts have only the general rule on page 12 to go on. The 0306 size is in neither the table nor the ordering key.
Is 0.2 V consistent with the rule on page 12 of the same sheet?
No. The rule gives 1.0 plus or minus 0.2 Vrms up to 10 µF and 0.5 plus or minus 0.2 Vrms above it, which span 0.8 to 1.2 V and 0.3 to 0.7 V. The table assigns 0.2 V to 76 rows and 0.1 V to 17, 93 rows in all.
Do the Ultra-small and General Purpose sheets agree?
On the 01005 band, yes: both read 0.5 V up to 10 nF and 0.2 V above. Inside the Ultra-small sheet, its X5R clause quotes 0.5 or 1.0 plus or minus 0.2 Vrms, so its own 0.2 V level is outside that window. The export holds 41 Class II rows in the Ultra-small series.
Where can I get the full list of exceptions?
From the datasheet. We hold 28 Walsin datasheets, 451 pages, and send the sheet for your part number on request. We read the footnotes from the PDF text, and a footnote number runs into the part number that follows it, so confirm any exception with Walsin before relying on our count.