Anti Sulfuration Chip Resistor: 41,147 Rows, Only 850 Resistance Values

An anti sulfuration chip resistor shelf that looks like 41,147 Walsin part numbers is really 850 resistance values, replicated across 5 prefixes and 8 case sizes. We opened all 27 chip-resistor export files that carry the word “Anti-Sulfuration” in the Series column and counted every row. The breadth is combinatorial, not 41,147 distinct specifications.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 137 of Walsin Technology (Walsin)’s chip resistor export files — 234,815 rows. This post is measured from the 27 of those files whose Series column matches “Anti-Sulfuration”, and every part number below is real and came out of one of them.

How deep is Walsin’s anti sulfuration chip resistor shelf really?

41,147 rows, no duplicates, spread across 27 of the 137 chip resistor export files and 8 distinct series names. We opened every one of the 27 files and summed the rows: Thick_Film_General_Purpose_1_1_10W.xlsx alone carries 4,566, down to 5 rows in Thick_Film_High_Power_Chip_Resistor_Jumper.xlsx. Every one of the 41,147 part numbers is distinct — there is no duplication across the 27 files, unlike the non-jumper high-power resistor set we measured separately, which carries 290 repeats.

Series	Rows	Prefix	Case sizes
Thick Film High Grade Anti-Sulfuration (Automotive)	12,871	SR	0402–2512 (7 sizes)
High Precision Anti-Sulfuration Chip Resistor	5,710 (part of SF total)	SF	0402–1210 (5 sizes)
Thick Film High Power Chip Resistor (Anti-Sulfuration)	9,135	SF (4,980) and WF (4,155)	0402–2512 (6 sizes)
Thick Film General Purpose Anti-Sulfuration (Automotive)	10,659	WR	0201–1210 (6 sizes)
Anti-Sulfuration Array, 0402×4 / 0402×2 / 0603×4 / 0603×2, Convex	2,772 (693 each)	SA	0402, 0603 (2 sizes)

How many distinct resistance values actually back the 41,147 rows?

850. We stripped the jumper rows (29 of the 41,147 read 0Ω), parsed every remaining Resistance cell and counted the unique values: 850 across 41,118 non-jumper rows — roughly 48 rows for every distinct value. The range runs from 1 Ω to 10 MΩ, a 7-decade span, but it is the same roughly 850-value E-series ladder repeated across 5 prefixes, up to 8 case sizes and up to 4 tolerance/TCR grades. We have not seen this row-to-value ratio counted anywhere else.

That matters for stock planning more than for selection. A buyer reading “41,147 anti-sulfuration part numbers” might expect 41,147 different electrical answers. There are 850.

Which five prefixes carry an anti sulfuration part, and what case sizes does each reach?

Five: SR, SF, WR, WF and SA, and no two cover the same case-size window. SR (High Grade Automotive) runs the widest, 0402 through 2512 across seven sizes. SA (the four array series) is the narrowest, 0402 and 0603 only — two sizes, and always as a multi-element array rather than a discrete resistor. WR (General Purpose Automotive) is the only prefix that reaches 0201.

Prefix	Rows	Tightest tolerance	Case-size floor	Case-size ceiling
SR	12,871	±1%	0402	2512
SF	10,690	±0.1%	0402	1210
WR	10,659	±1%	0201	1210
WF	4,155	±1%	0603	2512
SA	2,772	±1%	0402	0603

One series splits across two prefixes on its own: Thick Film High Power Chip Resistor (Anti-Sulfuration) carries 4,980 rows under SF and 4,155 under WF — the same series name, two different part-number prefixes, and no column in the export that says why.

What do the tolerance and TCR grades look like across the whole shelf?

Mostly ±1%, and the tight grades sit in one prefix only. We counted every row’s Tolerance and TCR cell: ±1% covers 29,224 of the 41,147 rows (71.0%), ±5% covers 6,184 (15.0%), and ±0.1% and ±0.5% are tied at 2,855 each (6.9% each) — both confined to the High Precision Anti-Sulfuration (SF) series. TCR follows the same shape: ≦±100 ppm/°C covers 29,052 rows (70.6%), ≦±200 covers 7,736 (18.8%), and the two widest bands, −200 to +600 and −100 to +350, cover 166 and 110 rows respectively — both inside the WR General Purpose Automotive series alone.

Tolerance	Rows	Share
±1%	29,224	71.0%
±5%	6,184	15.0%
±0.1%	2,855	6.9%
±0.5%	2,855	6.9%
Jumper	29	0.1%

If a specification calls for anti-sulfuration tighter than ±1%, there is exactly one prefix to look in — SF, and only inside the High Precision series, not the High Power series that also carries the SF prefix.

How many of the five prefixes share a datasheet with what Venatech holds?

One of five. Venatech holds two chip resistor datasheets — Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf and Walsin_WR_General_Purpose_Chip_Resistor.pdf — and only the WR prefix matches either by name. We checked all five prefixes against both PDF filenames: SR, SF, WF and SA match neither, covering 30,488 of the 41,147 rows, or 74.1% of the whole anti-sulfuration thick-film shelf. For those 30,488 rows, there is no prefix-matched datasheet in Venatech’s holdings today.

Prefix	Rows	Matches a held datasheet by prefix?
WR	10,659	Partial — Walsin_WR_General_Purpose_Chip_Resistor.pdf shares the prefix; the anti-sulfuration suffix is not separately confirmed inside it
SR	12,871	No
SF	10,690	No
WF	4,155	No
SA	2,772	No

Where do the lowest and highest resistance values in the shelf actually sit?

In the same series and the same case size. We found the minimum and maximum of the whole 41,147-row shelf both inside the SR High Grade Automotive series at 2512 (6432): SR25W1R00FTL at 1.00 Ω and SR25W1005FTL at 10,000,000 Ω — a 10-million-to-one spread inside one prefix and one case size, not across the breadth of the catalogue. No other series or case size reaches either end of that range.

Part number	Series	Case size	Resistance	Tolerance	TCR
SR25W1R00FTL	High Grade Anti-Sulfuration (Automotive)	2512 (6432)	1.00 Ω	±1%	≦±200
SR25W1005FTL	High Grade Anti-Sulfuration (Automotive)	2512 (6432)	10,000,000 Ω	±1%	≦±200

A buyer who reads “1 Ω to 10 MΩ” from a headline figure might assume that range is available everywhere in the shelf. It exists at exactly one case size in one series; the array series (SA) and the general purpose automotive series (WR) each cover a far narrower resistance window.

What should you check before specifying an anti sulfuration chip resistor?

Confirm the prefix carries the case size and tolerance you need, and separately confirm whether we hold a datasheet for that prefix, because the two questions have different answers on four of the five prefixes.

Requirement: 0603, automotive-qualified, anti-sulfuration, ±1%, datasheet held	Candidate	Prefix	Match / mismatch
	WR06W1R00FTLV	WR	Match on case, grade and ±1%; partial — shares a prefix with a held datasheet, suffix not separately confirmed
	SR06X000 PTL (jumper)	SR	Mismatch — this is a 0Ω jumper, not a resistive value; no datasheet held for SR
	WF20P1R00FTLV	WF	Mismatch on case (2010, not 0603); no datasheet held for WF
	SA06X10R0FTL	SA	Mismatch — this is a 4-element array, not a discrete resistor; no datasheet held for SA

Only the first candidate clears both the specification and the documentation question, and even that one carries a flagged caveat above.

1. State the prefix, not just “anti-sulfuration.” The five prefixes do not share a case-size window, a tolerance floor or a datasheet.
2. Cross your BOM in one pass on the free cross-reference tool. It decodes 18 manufacturers’ part numbers and matches against 800,000+ crossable Walsin part numbers, returning every field we hold.
3. Check ready stock before committing to a production slot — a dated snapshot as at 23 September 2026, not a live feed.
4. Ask us for the datasheet by prefix. We hold two resistor PDFs today; four of the five anti-sulfuration prefixes have no match by name, and your request is what puts the gap on the list to Walsin.

Check us while you are here: an authorised Walsin Technology distributor in Hong Kong, confirmable with Walsin directly, holding 28 Walsin datasheets, 451 pages, sent on request.

For how the arrays compare with a standard array at the same footprint, see Chip resistor arrays explained. For how rated power behaves by case size on the resistive parts generally, see Chip resistor power rating by case size. The full range is on the Walsin chip resistor range page.

The short version

An anti sulfuration chip resistor shelf of 41,147 part numbers resolves to 850 distinct resistance values across 5 prefixes and 8 case sizes. One series splits across two prefixes with no column explaining why. Tolerance tighter than ±1% exists only inside one prefix’s High Precision series, and the 1 Ω-to-10 MΩ range we quoted sits entirely inside one case size of one prefix, not across the shelf. Only one of the five prefixes shares a name with a datasheet Venatech holds, and even that match is unconfirmed below the prefix level.

Send us the prefix, case size and tolerance you need and we will tell you which of the 850 values Walsin actually stocks it at — and whether we can back the choice with a datasheet today or whether that request goes to Walsin first.

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Frequently asked questions

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