Chip Resistor Datasheet Revision: ASC_WR_V24 Is Ten Years Old and Covers 8,032 of 234,815 Parts, Checked for UK Buyers

The chip resistor datasheet revision we hold for Walsin’s biggest resistor series is ASC_WR_V24, dated SEP 2016. We opened all 137 chip resistor export files to measure what it actually covers: 8,032 of 234,815 part numbers, 3.4%. For a buyer in the United Kingdom qualifying this line, that is the number to know before the datasheet’s age.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds 28 Walsin Technology (Walsin) datasheets, 451 pages, and all 203 of Walsin’s parametric export files. For this post we parsed all 137 chip resistor files — 234,815 rows — against the ten pages of Walsin_WR_General_Purpose_Chip_Resistor.pdf ourselves, line by line, rather than take the coverage figure on trust. Every part number below is real.

How old is the chip resistor datasheet revision we hold for Walsin’s biggest resistor series?

Ten years and one month. We read the footer of all 451 pages we hold. The WR general purpose sheet is stamped ASC_WR_V24 SEP 2016 on every one of its ten pages — the only numbered revision in our library besides the MR automotive sheet, ASC_MR_V13, dated March 2024. All 24 MLCC series sheets carry a document name and a month, no number, between January and September 2026.

Document	Revision footer	Age at 11 October 2026	Public URL
24 MLCC series sheets	Name plus month, no number	1–9 months	Yes, in INDEX_MLCC_series.csv
Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf	ASC_MR_V13	31 months	None
Walsin_WR_General_Purpose_Chip_Resistor.pdf	ASC_WR_V24	121 months	None

A “V24” footer implies at least twenty-three earlier issues, and we hold none of them. We searched all 451 pages again for “revision,” “revised,” “version” and “amend”: all four return zero. There is no way, from inside our own library, to tell whether a V25 exists.

How much of the WR export does ASC_WR_V24 actually cover?

8,032 of 234,815 rows, and we counted every one of them fresh for this post. We parsed all 137 chip resistor files: 45,315 part numbers carry a WR prefix, a prefix that appears in no other series group in the catalogue. Of those, 24,737 sit in the non-automotive WR general purpose series once the automotive rows are excluded. The sheet’s quick-reference table on page 3 lists exactly four size codes — WR12, WR08, WR06, WR04 — and those four sizes account for 8,032 of the 24,737, which is 32.5% of the non-automotive series and 3.4% of the entire 234,815-row chip resistor catalogue.

Size in the export	Rows	In ASC_WR_V24‘s quick reference?
1206 (3216)	2,218	Yes — WR12
0805 (2012)	1,938	Yes — WR08
0603 (1608)	1,938	Yes — WR06
0402 (1005)	1,938	Yes — WR04
0201 (0603)	7,752	No
01005 (0402)	755	No
1210 (3225)	1,824	No
1218 (3248)	1,938	No
2010 (5025)	2,218	No
2512 (6432)	2,218	No

Six of ten export size codes sit outside the sheet entirely — 16,705 rows, more than twice the 8,032 the sheet actually covers.

Which WR size codes in the export sit outside the sheet entirely?

The same six, and we picked one resistance value to show it cleanly: 4.70 kΩ, ±1%, across every WR size the export carries. We have not seen a single resistance value compared across all ten WR sizes before.

Part number	Size	Rated power in export	TCR in export	Match / mismatch vs ASC_WR_V24
WR12X4701FTL	1206	1/4 W	≦±100	Match — size, power and TCR as tabulated
WR08X4701FTL	0805	1/8 W	≦±100	Match on all three
WR06X4701FTL	0603	1/10 W	≦±100	Match on all three
WR04X4701FTL	0402	1/16 W	≦±100	Match on all three
WR02X4701FAL	0201	1/20 W	≦±200	Mismatch — size code not in the sheet; TCR grade not in the sheet either
WR01X4701FDL	01005	1/32 W	≦±200	Mismatch — smallest footprint in the series, absent from page 3
WR10X4701FTR	1210	1/3 W	≦±100	Mismatch — size absent, though TCR happens to match
WR18X4701FTL	1218	1 W	≦±100	Mismatch — four times the sheet’s largest published dissipation figure
WR20X4701FTL	2010	3/4 W	≦±100	Mismatch — no row in the sheet at all
WR25X4701FTL	2512	1 W	≦±100	Mismatch — largest footprint in the series, absent

The same resistance value, the same tolerance, ten real part numbers, and six of them have no governing page in the one document we hold for this series.

Does the final letter of a WR part number mean one thing inside the sheet and another outside it?

It means less than the sheet claims almost everywhere, and we measured the split by whether the size is in the sheet or not. Page 6 of ASC_WR_V24 documents exactly one termination code, L. Inside the four sizes the sheet tabulates, L and R endings are close to even — 4,016 end in L against 3,876 in R, a ratio of 1.04 to 1. Outside the sheet’s four sizes, the balance shifts hard toward L — 10,611 against 5,814, a ratio of 1.82 to 1 — and 280 of the 16,705 outside rows end in a third letter, N, that the sheet does not mention at all.

We have not seen this inside-sheet-versus-outside-sheet split counted anywhere. Whatever that final character encodes, it is not applied evenly across the catalogue, and the Termination column reads Sn base (Lead free) on every one of the 24,737 rows regardless of which letter closes the part number — so the letter is not the termination finish on any of them.

Where does the export disagree with the sheet on a size the sheet does cover?

On 1206, twice. Page 3 gives WR12’s maximum dissipation as 1/4 W at 70°C ambient. We counted all 2,218 non-automotive 1206 rows: 140 are rated 1/2 W — double the sheet’s own published figure, on the size code the sheet explicitly tabulates. Every one of the 140 carries a trailing FN suffix the sheet’s ordering key never defines, including WR12F1R00FTL FN at 1.00 Ω ±1%.

What should a UK buyer do with a datasheet revision this old?

Three steps, and the first costs nothing but five minutes with the export. Check which side of the sheet’s four sizes your part sits on; if it is WR12, WR08, WR06 or WR04, we will send the PDF, and it covers dimensions, maximum operating and overload voltage, climatic category and the E96 marking table reliably, because physical fields like these move the least between revisions. If it is WR01, WR02, WR10, WR18, WR20 or WR25, the export is your primary source and we say so rather than imply the sheet reaches that far.

1. State which size code your part number uses before you qualify against the sheet. We will tell you honestly whether ASC_WR_V24 governs it.
2. Cross the whole bill of materials in one pass. Paste up to 500 part numbers or drop your Excel or CSV into the free cross-reference tool, filter by commercial or automotive grade, and read every difference the tool states rather than a claimed match.
3. Check what is physically in Hong Kong on ready stock before committing a build slot — a dated snapshot as at 23 September 2026, not a live feed.

For the automotive-grade split on the same resistor family, see MR versus WR, field by field, and for how rated power tracks case size across Walsin’s lines generally, chip resistor power rating by case size. The full line is on the Walsin chip resistor page.

The short version

The chip resistor datasheet revision we hold for Walsin’s WR general purpose series is ASC_WR_V24, SEP 2016 — 121 months old. It tabulates four size codes and covers 8,032 of 234,815 chip resistor part numbers, 3.4% of the whole catalogue; the other 16,705 WR rows sit outside it. The final character’s meaning shifts from near-even inside the sheet’s four sizes to nearly 2 to 1 outside them, and 140 of 2,218 1206 rows are rated at twice the sheet’s own published dissipation. We hold no public URL for the file. Qualification stays with you.

Send us the WR part numbers off your UK bill of materials and we will tell you, line by line, whether ASC_WR_V24 actually governs your footprint or whether the figure came straight from the export — then what was physically in Hong Kong on 23 September 2026. And if your own BOM tool strips the final letter off a Walsin resistor code, check the ratio above before your next build.

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Frequently asked questions

<!– wp:rank-math/faq-block {"questions":[{"id":"faq-question-01","title":"What is the current Walsin WR chip resistor datasheet revision?","content":"The revision we hold is ASC_WR_V24, dated SEP 2016 and stamped on all ten of its pages. We do not know whether a later issue exists, because no document we hold says so and we hold no public URL for the file. The MR automotive sheet, by comparison, is ASC_MR_V13 from March 2024.”,”visible”:true},{“id”:”faq-question-02″,”title”:”How many Walsin chip resistor part numbers does ASC_WR_V24 actually cover?”,”content”:”8,032 of the 234,815 rows in Walsin’s chip resistor export, 3.4%. We parsed all 137 export files ourselves: 45,315 part numbers carry a WR prefix, 24,737 sit in the non-automotive WR general purpose series, and 8,032 of those fall inside the four size codes the sheet tabulates.”,”visible”:true},{“id”:”faq-question-03″,”title”:”Which WR size codes are missing from the datasheet?”,”content”:”Six of the ten in the export: 01005, 0201, 1210, 1218, 2010 and 2512. WR01X4701FDL, WR02X4701FAL, WR10X4701FTR, WR18X4701FTL, WR20X4701FTL and WR25X4701FTL are real examples at the same 4.70 kΩ value, and none of their size codes resolves against the sheet’s page 3 table.”,”visible”:true},{“id”:”faq-question-04″,”title”:”Does the final letter of a Walsin WR part number mean the termination finish?”,”content”:”Not reliably. The sheet documents one value, L, for that field. Inside the four sizes it tabulates, L and R endings are close to even. Outside them, the ratio shifts to 1.82 L for every R, and 280 rows end in a third letter, N, the sheet never mentions. The Termination column reads identically on every row regardless.”,”visible”:true},{“id”:”faq-question-05″,”title”:”Does Walsin’s chip resistor export ever disagree with the datasheet on a size it covers?”,”content”:”Yes, on 1206. The sheet states a maximum of 1/4 W at 70°C. We counted all 2,218 non-automotive 1206 rows: 140 are rated 1/2 W, each carrying a trailing suffix the sheet’s ordering key does not define, including WR12F1R00FTL FN.”,”visible”:true},{“id”:”faq-question-06″,”title”:”What should a UK engineer do before qualifying against ASC_WR_V24?”,”content”:”Check which size code the part uses. The four the sheet tabulates — WR12, WR08, WR06, WR04 — are reliably covered for dimensions and voltage ratings. The other six size codes have no governing page in our library, and every figure for them comes from the export, flagged as such.”,”visible”:true}],”listStyle”:””,”titleWrapper”:”h3″,”titleCssClasses”:””,”contentCssClasses”:””,”sizeSlug”:””} –>

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