AEC-Q200 Anti Sulfuration Resistor: the SF File Named for It Holds Zero of Zero Rows

Walsin names a file for an AEC-Q200 anti sulfuration resistor: Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx. We opened it. It holds zero rows against zero rows — there is nothing to compare field by field, and every real SF part sits in a file that carries no AEC-Q200 label at all.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all five of Walsin Technology (Walsin)’s SF anti-sulfuration thin film export files, 15,080 real rows across the two that actually hold data. Every count below is one we ran against the raw files ourselves, and every part number is real.

Does Walsin’s SF anti sulfuration resistor come in an AEC-Q200 version?

A file is named for one. The row count behind it is zero. We opened Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx — the one SF export file in Walsin’s thin film catalogue whose name carries “AEC_Q200” — and it returns 0 rows, same nine-column header, same 6,289-byte file size as the other two empty SF files. The two actual SF shelves, 270 rows at 1206 and 14,810 at 2010, sit in files named SF_Series_1.xlsx and SF_Series_2.xlsx, neither of which mentions AEC-Q200 anywhere in its filename.

File	Rows	What its name claims
Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx	0	An AEC-Q200-qualified SF shelf
Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_A_Series.xlsx	0	A separate “A Series” SF shelf
Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_Series_0.xlsx	0	An SF “Series 0” shelf
Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_Series_1.xlsx	270	SF “Series 1”, 1206 (3216)
Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_Series_2.xlsx	14,810	SF “Series 2”, 2010 (5025)

What does the AEC-Q200-labelled SF file actually contain?

The same nine column headers as every other SF file, and nothing beneath them. We read the file’s columns directly: Part Number, Series, Size, Resistance, Tolerance, TCR, Rated Power, Packaging, Termination — identical to SF_Series_1.xlsx and SF_Series_2.xlsx, with zero data rows under any of the nine. There is no “Qualification” column, no “AEC-Q200” flag, no grade indicator anywhere in the schema. The file is a template Walsin’s export generator produced and never populated, as far as the extract we hold shows.

Is SF alone, or does the same emptiness show up elsewhere in Walsin’s thin film export?

It is not alone. Thin_Film_Professional_AEC_Q200_Chip_Resistor_WF_Q_S.xlsx — the AEC-Q200-labelled file for Walsin’s WF precision thin film series — also returns 0 rows, the identical 6,289-byte header-only file. We have not seen this pairing counted before: of Walsin’s 20 thin film export files, every single one whose filename contains “AEC_Q200” is empty. Two files claim an AEC-Q200 thin film shelf by name; both hold nothing.

AEC-Q200-named thin film file	Series	Rows
Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx	SF (anti sulfuration)	0
Thin_Film_Professional_AEC_Q200_Chip_Resistor_WF_Q_S.xlsx	WF (precision)	0

That is a pattern, not a coincidence specific to SF: the thin film export’s AEC-Q200 naming convention exists, and the data behind it does not, for either series we hold a file for.

Field by field, what would an AEC-Q200 SF row need to show, and what does it show?

Real SF part numbers against the stated requirement “this row appears in the file named for AEC-Q200”. Every one of the 15,080 rows fails that test, because none of them sits in the AEC-Q200-named file at all.

Part number	Case size	Tolerance	TCR	File it actually sits in	In the AEC-Q200-named file?	Match / mismatch
SF12T1R00ATL	1206 (3216)	±0.05%	≦±50	SF_Series_1.xlsx	No	Mismatch
SF12T1R00FTL	1206 (3216)	±1%	≦±50	SF_Series_1.xlsx	No	Mismatch
SF20U3004FTL	2010 (5025)	±1%	≦±25	SF_Series_2.xlsx	No	Mismatch
SF20T4R70ATL	2010 (5025)	±0.05%	≦±50	SF_Series_2.xlsx	No	Mismatch

We checked all 15,080 rows for this, not a sample, by confirming the AEC-Q200-named file’s row count is zero and the other two files’ combined row count is 15,080 — there is no third place a row could be hiding. The answer to “what changes between the AEC-Q200 SF shelf and the plain SF shelf” is: there is no AEC-Q200 SF shelf in the export to change anything from.

Does anything in the two real SF files mark a row as AEC-Q200 qualified?

No. We read the Series column on all 15,080 rows in SF_Series_1.xlsx and SF_Series_2.xlsx; every row carries the identical string, “Anti-Sulfuration Thin Film Chip Resistor /SF Series”, with no AEC-Q200 qualifier, no grade suffix and no automotive flag attached to any single row. Nothing in the nine columns — Part Number, Series, Size, Resistance, Tolerance, TCR, Rated Power, Packaging, Termination — marks a subset as automotive-grade. If an AEC-Q200-qualified SF part exists, the parametric export we hold gives no way to identify which rows they would be.

That matters for how you read the series name at all. Elsewhere in Walsin’s own range, AEC-Q200 is stated as “compliant”, never “certified” — this is not in the documents we hold for SF specifically, because we hold no SF documents at all; thin film carries zero of Venatech’s 28 Walsin datasheets, 451 pages, across any of its three populated series.

What should a buyer who needs an AEC-Q200 anti sulfuration resistor actually do?

Ask Walsin directly whether an AEC-Q200-qualified SF part exists and request the qualification report by part number, because neither the export nor our datasheet library answers that question today. We are not telling you Walsin lacks an AEC-Q200 anti-sulfuration thin film part — we are telling you the file bearing that name in our own extract holds nothing, and that absence is the honest starting point for the conversation rather than a dead end.

1. Treat the “AEC-Q200” filename as a placeholder, not a confirmed shelf, until Walsin answers in writing.
2. Cross your incumbent automotive part against the real 15,080 SF rows on the free cross-reference tool — it states what matches and what does not, field by field, rather than guessing at a qualification the data does not show.
3. Check what is physically in Hong Kong on ready stock, dated as at 23 September 2026, while the qualification question is still open with Walsin.
4. Request the SF approval sheet and any AEC-Q200 qualification report together — we hold neither today, and a written request from you is what puts both on the list to Walsin.

For what “compliant” versus “certified” actually means on a Walsin datasheet, see AEC-Q200 compliant is not certified. For the other eight thin film export files that return nothing, see Nine Walsin thin film exports return nothing. The full line sits on the Walsin thin film range page.

The short version

The file named for an AEC-Q200 anti sulfuration resistor in Walsin’s thin film export holds zero rows, and it is not alone — the AEC-Q200 file for the WF precision series is equally empty. Every one of the 15,080 real SF rows sits in two files that carry no AEC-Q200 label at all, and nothing in their Series, Tolerance or TCR columns marks a row as automotive-qualified. The honest field-by-field answer to “what changes between an AEC-Q200 SF part and a plain one” is that there is no AEC-Q200 SF part in the data to compare.

Tell us you need an AEC-Q200-qualified anti sulfuration resistor and we will put that exact question to Walsin in writing, rather than inferring a qualification from a filename that currently points at nothing. If you hold a Walsin document that names an AEC-Q200 SF part, send it — we would like to correct this post with it.

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Frequently asked questions

<!– wp:rank-math/faq-block {"questions":[{"id":"faq-question-01","title":"Does Walsin make an AEC-Q200 version of the SF anti sulfuration resistor?","content":"Our extract does not show one. The file named for it, Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx, returns zero rows. All 15,080 real SF part numbers sit in two differently named files, SF_Series_1.xlsx and SF_Series_2.xlsx, neither of which carries an AEC-Q200 label.”,”visible”:true},{“id”:”faq-question-02″,”title”:”Is the AEC-Q200 SF file the only empty AEC-Q200-named file in the thin film export?”,”content”:”No. Thin_Film_Professional_AEC_Q200_Chip_Resistor_WF_Q_S.xlsx, the AEC-Q200 file for Walsin’s WF precision series, also returns zero rows. Both of the thin film export’s AEC-Q200-named files are empty in the extract Venatech holds.”,”visible”:true},{“id”:”faq-question-03″,”title”:”Does the SF Series column mark any row as AEC-Q200 qualified?”,”content”:”No. All 15,080 rows across both populated SF files carry the identical Series text, \”Anti-Sulfuration Thin Film Chip Resistor /SF Series\”, with no AEC-Q200 qualifier, grade suffix or automotive flag on any single row.”,”visible”:true},{“id”:”faq-question-04″,”title”:”Why does an empty file matter if the real SF parts are elsewhere?”,”content”:”Because a buyer searching for \”SF AEC-Q200\” by filename or series label will find a file that promises automotive qualification and delivers nothing, while the real stock sits under names that say nothing about AEC-Q200 at all. The mismatch is between what the catalogue structure implies and what the data actually contains.”,”visible”:true},{“id”:”faq-question-05″,”title”:”Does Walsin say AEC-Q200 parts are \”certified\”?”,”content”:”Not in any document Venatech holds. Walsin’s own wording elsewhere in the catalogue is \”compliant\”, never \”certified\”, and for SF specifically we hold no datasheet at all to check the wording against — thin film carries zero of Venatech’s 28 Walsin PDFs.”,”visible”:true},{“id”:”faq-question-06″,”title”:”What should I do if I need an AEC-Q200-qualified anti sulfuration resistor today?”,”content”:”Ask Walsin directly and request the qualification report by part number, since the export gives no column that would identify one. Cross your incumbent part on the free cross-reference tool for the real SF field data in the meantime, and check the dated ready-stock snapshot before committing a production slot.”,”visible”:true}],”listStyle”:””,”titleWrapper”:”h3″,”titleCssClasses”:””,”contentCssClasses”:””,”sizeSlug”:””} –>

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