MLCC Operating Temperature by Dielectric: 12 Walsin Sheets Print 4 Ranges, 107 Export Rows Sit in a 150 °C Column, and the Characteristic Row Has 2 Names

MLCC operating temperature by dielectric is stated four ways across Walsin’s 12 series approval sheets: to 85, 105, 125 or 150 °C. We joined those columns to 21,283 export rows. 641 rows stop at 85 °C, 133 at 105 °C and 107 reach 150 °C. The export itself carries no temperature column.

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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 the first 12 series approval sheets in the MLCC folder, 175 pages, and from 00_ALL_MLCC_parts_combined.xlsx. We opened every page, extracted the operating temperature wherever it is printed, and joined each dielectric column to the export rows of the series it describes. Every part number below is real. The question is the one a qualification engineer asks first: if the export says X5R, what temperature is that part good for?

How many different operating temperature ranges do Walsin’s 12 MLCC sheets print?

Four, and every one starts at minus 55 °C. We read the “Operating temperature” row of the general electrical data table on all 12 sheets. The upper limit is +85 °C for X5R, +105 °C for X6S, +125 °C for NP0, X7R and X7S, and +150 °C for X8G and for the RH series. That is 4 upper limits, in 12 sheets, under 6 dielectric labels. The range belongs to the dielectric column, not to the sheet: the General Purpose sheet alone prints three of the four.

Upper limit	Dielectric columns that carry it	Sheets that print it	Real part in the export	Your incumbent part’s range (fill in)	Match / mismatch against a 125 °C requirement
+85 °C	X5R	01_General_Purpose, 02_Ultra_Small_01005	0201X101K160		Mismatch — 40 °C short
+105 °C	X6S	01_General_Purpose	0201S224K6R3		Mismatch — 20 °C short
+125 °C	NP0, X7R, X7S	11 of the 12 sheets	0805B101K251		Match
+150 °C	X8G; the whole RH series	06_Microwave_RF, 07_Microwave_High_Reliability_RH, 11_Automotive_MT	RF18G180J251		Match, with 25 °C of headroom

The temperature is printed on 22 of the 175 pages, 12.6 percent. Everywhere else a reader has to carry it in their head.

How many export rows sit under each range?

20,399 of 21,283 sit under 125 °C, and 884 do not. We mapped the 9 export series that these sheets describe, 21,283 of the 24,026 rows, to the dielectric column on the page, using the Dielectric field. 641 rows are X5R and stop at 85 °C. 133 are X6S and stop at 105 °C. 107 are X8G and reach 150 °C. 3 rows have no usable dielectric to map. The remaining 2,743 rows belong to series with no sheet among these 12, and we have left them out rather than guess.

Range from the sheet	Export rows	Series where they sit	Example	Match / mismatch against what the column can tell you
+85 °C	641	General Purpose 609, Ultra-small 32	01R5X102K100	Match — X5R maps to one range on both sheets
+105 °C	133	General Purpose 133	0402S105K6R3	Match — X6S appears in one sheet only
+125 °C	20,399	9 series	ST18B473K500	Match — NP0, X7R and X7S agree on every sheet that prints them
+150 °C	107	Microwave RF 104, Automotive MT 3	MT15G180F500	Match — but the range is per dielectric, not per series
No range stated	3	General Purpose 2 (Y5V), Automotive MT 1	1206F474Z500	Mismatch — the sheet gives Y5V no operating temperature on any of its 21 pages

The three unmapped rows are 1206F474M500 and 1206F474Z500, which carry Y5V, and MT18N391J101, whose Dielectric field holds the number 390. We have not seen this counted anywhere: across 21,283 rows, 641 plus 133 plus 107 equals 881, so one row in 24 sits outside the 125 °C class that most buyers assume, and the export gives no other way to tell. Our free cross-reference tool lists the dielectric as Walsin states it, and the range is yours to read from the sheet.

The 23 September 2026 ready stock snapshot holds 786 part numbers in these 9 series. 55 are X5R, 3 are X6S, 1 is Microwave RF X8G (RF21G8R2C251) and 1 is Y5V. A snapshot is a dated list, not a live feed.

Do the two temperature statements in one sheet agree?

Yes, where they exist, and 10 of the 12 sheets make the statement twice. The first is the operating temperature row on the electrical data page. The second is item 6, “Temperature Coefficient”, in the reliability section. We compared every dielectric and every number: 10 sheets print both, the pairs agree on all of them, and the two automotive sheets, 11_Automotive_MT and 12_Soft_Term_Automotive_ST, print the range once. In their reliability block the range is replaced by the words “Min. operating temp. to Max. operating temp. at 25°C” and no number.

That is a clean result and it should be reported as one. Nothing is contradicted. The weakness is the other direction: a sheet that prints its range on one page and says “Min. to Max.” on page 25 forces the reader to join the two. The Automotive MT sheet, the one automotive sheet with a 150 °C column, is one of the two that leaves the reader to do it.

Why does the same row carry two names and two units?

Because the sheets were written in two styles and the styles were never merged. The row under the operating temperature is headed “Capacitance characteristic” on 6 sheets and “Capacitance change” on 6. Its NP0 value is printed ±30ppm on 6 sheets and ±30ppm/°C on the other 6. We read all 12.

Sheet	Row heading	NP0 or X8G value in the electrical data table	Value in the same sheet’s reliability section	Match / mismatch
01_General_Purpose	characteristic	±30ppm	±30ppm/°C	Mismatch
02_Ultra_Small_01005	change	±30ppm	±30ppm/°C	Mismatch
03_Large_Size_1825_2220_2225	characteristic	±30ppm	±30ppm/°C	Mismatch
04_Middle_and_High_Voltage	characteristic	±30ppm	±30ppm/°C	Mismatch
05_Surface_Coating_Type	characteristic	±30ppm	±30ppm/°C	Mismatch
10_High_Q_Low_ESR_HH	change	±30ppm	±30ppm/°C	Mismatch
06_Microwave_RF, 07_Microwave_High_Reliability_RH, 08_Microwave_Narrow_Tolerance_UF, 09_Microwave_Automotive_RT	change	±30ppm/°C	±30ppm/°C	Match
11_Automotive_MT, 12_Soft_Term_Automotive_ST	characteristic	±30ppm/°C	±30ppm/°C	Match

Six of the 12 sheets print a bare ±30ppm in one table and ±30ppm/°C in another table of the same PDF. The difference is a factor of 100 if the unit is taken at face value. Thirty parts per million per degree over the 100 °C from 25 to 125 °C is 3,000 parts per million, 0.3 percent. A bare 30 parts per million is 0.003 percent. The reliability text uses the per-degree form on every sheet, so the per-degree reading is the one we use, but a script that copies the table row will store a different unit on 6 sheets than on the other 6. The 65-page full catalogue repeats it: we counted 15 series pages that print the row, 8 with a bare ppm and 7 with ppm/°C.

What does the 150 degree column promise, and what does the export hold?

Less than the column suggests. Two sheets give X8G a 150 °C column alongside NP0. The Microwave RF sheet lists X8G at 0402, 0603 and 0805, from 0.1 pF to 82 pF at 250 V and 500 V. The export holds 104 X8G rows: 101 at 0805, 3 at 0603 and none at 0402. The Automotive MT sheet lists X8G from 0.1 pF to 0.015 µF at 10 V to 100 V, and the export holds 3 rows, all 18 pF at 50 V.

Sheet	What the 150 °C column states	What the export holds	Match / mismatch
06_Microwave_RF	X8G at 0402, 0603, 0805; 0.1 pF to 82 pF; 250 V, 500 V	104 rows: 0805 = 101, 0603 = 3, 0402 = 0; 0.2 pF to 82 pF; 250 V = 53, 500 V = 51	Mismatch on size (0402 empty) and on the lower end (0.1 pF absent). Match on voltage and upper capacitance
11_Automotive_MT	X8G at 0201 to 1210; 0.1 pF to 0.015 µF; 10 V to 100 V	3 rows, MT15G180F500, MT15G180G500, MT15G180J500: one 0402 value, 18 pF, 50 V, three tolerances	Mismatch — one capacitance and one voltage out of the column’s range
07_Microwave_High_Reliability_RH	150 °C for the whole series	0 rows, series not in the export	Mismatch — cannot be offered by the cross-reference tool

A range on a sheet is a statement about what Walsin can make. A row in the export is a statement about what is listed. They are different, and the 150 °C class is where the gap is widest: 107 listed rows against three sheets that print the range. For a longer treatment of the dedicated high-temperature line, see high-temperature MLCC to 150 °C, the HT series. For how the dielectric letters are written, see NP0 versus X7R versus X5R.

What should you read before assigning a temperature to a part?

The dielectric on the sheet, not the series name. Take the sheet for the series, find the dielectric column, and read the operating temperature row; then confirm it in the reliability section. For the 3 rows with no mappable dielectric, and for any part where the export Dielectric field is not one of the six labels on the sheets, ask. We hold 28 Walsin datasheets, 451 pages, and we will send the sheet that covers your part number.

Qualification stays with you. The sheet’s range is the manufacturer’s statement; your circuit’s temperature margin, derating and your own test results decide whether it is enough. Venatech makes no qualification claim of its own, and the sheets do not name a manufacturing site. For the AEC-Q200 sheets, request the qualification report for the exact part number, because the reliability pages in our documents describe test conditions and not a lot-level report. The capacitor range sits on the MLCC page.

The short version

Four upper limits exist across Walsin’s 12 series sheets: 85, 105, 125 and 150 °C, all from minus 55 °C. They belong to the dielectric column. Across 21,283 export rows, 641 are X5R at 85 °C, 133 are X6S at 105 °C, 107 are X8G at 150 °C, 20,399 are at 125 °C and 3 have no range. Six sheets print ±30ppm in one table and ±30ppm/°C in the other. The 150 °C column promises 0402 X8G on the Microwave RF sheet and the export holds none. We will not tell you a part is good for your temperature. We will show you the column the sheet puts it in. Confirm against both datasheets and qualify in your own circuit.

Send us the dielectric and the maximum temperature on your specification, and we will tell you which of these four columns it sits in. And a question back: when your selector filters on “X7R”, does it know what that means for the part’s range?

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Frequently asked questions

<!– wp:rank-math/faq-block {"questions":[{"id":"faq-question-01","title":"What operating temperature range does a Walsin X5R MLCC have?","content":"Minus 55 to plus 85 °C on the two sheets that print X5R, the General Purpose and the Ultra-small 01005 sheet. The export holds 641 X5R rows in those two series, 609 and 32. The range is printed in the electrical data table and again in the reliability section, and the two agree.","visible":true},{"id":"faq-question-02","title":"Which Walsin MLCC dielectrics reach 150 °C?","content":"X8G, and the whole RH series. X8G appears with a 150 °C column on the Microwave RF and Automotive MT sheets, and the RH sheet prints 150 °C for the series. In the export, 104 Microwave RF rows and 3 Automotive MT rows carry X8G, 107 in all; the RH series has no rows.","visible":true},{"id":"faq-question-03","title":"Does the export say what temperature a part is rated to?","content":"No. The 16 columns in 00_ALL_MLCC_parts_combined.xlsx do not include operating temperature. The only route is the Dielectric field joined to the series sheet, and that works for 21,280 of the 21,283 rows covered by these 12 sheets. Three rows carry Y5V or a bare number.”,”visible”:true},{“id”:”faq-question-04″,”title”:”Is the NP0 temperature coefficient in parts per million or per degree?”,”content”:”Per degree, by the reliability text. Six of the 12 sheets print a bare ±30ppm in the electrical table and ±30ppm/°C in the reliability section. The unit differs by a factor of 100 over the 100 °C from 25 to 125 °C, so copy the per-degree form.”,”visible”:true},{“id”:”faq-question-05″,”title”:”Do both automotive sheets print the operating range twice?”,”content”:”No. The Automotive MT and Soft Term Automotive ST sheets print it once, on page 3. In their reliability block they say \”Min. operating temp. to Max. operating temp. at 25°C\” with no number, while the other 10 sheets print the figures in both places.”,”visible”:true},{“id”:”faq-question-06″,”title”:”Does the General Purpose sheet give Y5V an operating temperature?”,”content”:”No. Y5V is defined in the ordering key and has a limit in the reliability table, but we searched all 21 pages and found no operating temperature for it. The export holds 2 Y5V rows, 1206F474M500 and 1206F474Z500, so those cannot be mapped to a range.”,”visible”:true},{“id”:”faq-question-07″,”title”:”Which documents do I need before specifying an MLCC on temperature?”,”content”:”The series approval sheet and the dielectric column on it. We hold 28 datasheets, 451 pages, and send the sheet for your part number on request. For thin film, inductor, varistor, disc capacitor, RF and antenna lines we hold none, so confirm those against Walsin’s own site.”,”visible”:true}],”listStyle”:””,”titleWrapper”:”h3″,”titleCssClasses”:””,”contentCssClasses”:””,”sizeSlug”:””} –>

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