Czech Republic Tier-2 Documentation: Eighteen Document Types Return Zero of Our 451 Pages, and 8 Pages Carry a Certificate Number

Czech Republic tier-2 documentation is where our package is thinnest, and we will say so. We searched all 451 pages of the 28 Walsin datasheets we hold for eighteen document types a tier-1 submission asks for. All eighteen return zero. Five third-party certificate numbers sit on 8 of the 451 pages.

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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. This is written for a Czech tier-2 assembling a submission package for a tier-1 customer. We re-ran every count below ourselves against the extracted PDF text rather than quoting an internal audit. Every part number is real. We hold neither ISO 9001 nor IATF 16949, and we say so here rather than let you find out at the audit.

Which eighteen document types does a Czech tier-2 package need that our 451 pages never mention?

All eighteen of them. We searched the full text of all 451 pages with word-boundary matching, after rejoining words that the PDF had broken across a line, because a naive regex produces false positives on strings like “reach”. Every one of the eighteen returned zero pages and zero documents. Here is the list, with what we hold in each one’s place.

Document type a tier-2 package asks for	Pages in our 451	What we hold instead
REACH · SVHC · conflict minerals · PFAS · Proposition 65 · China RoHS · ISO 14001 · IMDS · VDA · Declaration of Conformity · CE or UKCA	0 each	nothing; all on our request list
RoHS Declaration of Conformity, signed	0	a page-one header claim on 27 of 28 documents, and one named exemption in 1 of 28
ISO 9001 certificate	0	nothing from Walsin, and nothing of our own — we hold none
IATF 16949 certificate	0	nothing from Walsin, and nothing of our own — we hold none
PPAP submission pack	0	451 pages of approval sheets, which are not a submission pack
AEC-Q200 qualification report	0	AEC-Q200 named on 8 of 28 documents, 73 pages, as compliant and qualified to
Certificate of Conformity template	0	a certificate of conformity per shipment on request, from us, not from a datasheet
Product change notification policy	0	a reservation of the right to change, on 27 of 28 documents — see below
Counterfeit-avoidance policy	0	original sealed Walsin packaging and an authorised channel, from us

What do we actually hold for an automotive part a Czech tier-2 is submitting?

An approval sheet, and in one case not even that. We took five real automotive part numbers and checked each one against the document that governs it, line by line. The pattern is consistent: the series is described as AEC-Q200 compliant, there is no qualification report for any part number, and the submission documents appear on zero pages.

Part number	Series	Document we hold	AEC-Q200 wording in that document	Qualification report	Submission documents in it	Match / mismatch against a tier-2 package
MT15G180J500	Automotive MT	11_Automotive_MT.pdf, 29 pp	page 1 title “Qualified to AEC-Q200”; page 2 “The MT series meet AEC-Q200 requirement”	none held	0 of 29 pages	Mismatch — compliant wording, test tables, no report, no pack
ST18B473K500	Soft term automotive ST	12_Soft_Term_Automotive_ST.pdf, 23 pp	page 1 title “Qualified to AEC-Q200”; page 2 “The ST series is AEC-Q200 compliant”	none held	0 of 23 pages	Mismatch — same position, soft-termination series
MG15X104K100	MG	14_MG_Series_High_Reliability.pdf, 23 pp	page 2 ordering key: “MG = Industry & Automotive (without AEC-Q200 certification)”	none held, and none claimed	0 of 23 pages	Mismatch, and Walsin says so itself — on all 788 MG part numbers
S242B101K502	Safety X1/Y2 S2	16_Safety_X1Y2_General_S2.pdf, 14 pp	not applicable; carries R50381780, E182369 and CQC20001280137 on pages 2 and 3	none held	0 of 14 pages	Match on named third-party certification, mismatch on the submission pack
MR06W1005FTL	MR automotive resistor	Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf, 10 pp	page 2 “Automotive AEC Q-200 & Military MIL-STD Compliant”	none held	0 of 10 pages	Match on the only named RoHS exemption in 451 pages, mismatch on the rest
SR04W1005FTL	SR anti-sulfuration automotive resistor	none	none — SR04 and SR06 appear on 0 of 451 pages	none held	0 pages exist	Mismatch — 12,871 part numbers with no governing page at all

Two rows deserve a sentence each. MG15X104K100 is the honest one: Walsin’s own ordering key states the series carries no AEC-Q200 certification, on all 788 MG part numbers, so do not let a selector file it next to MT — see automotive MLCC, MT against MG. SR04W1005FTL is the uncomfortable one: the SR series is the anti-sulfuration automotive resistor a Czech tier-2 asks for by name, it holds 12,871 part numbers, and we checked for SR04 and SR06 across all 451 pages. Both return nothing.

AEC-Q200 is “compliant”, never “certified” — Walsin’s own word on 8 of 28 documents across 73 pages, and we will not upgrade it. What closes the gap for a tier-1 is the qualification report for your exact part number, and we hold no qualification report for any part. Venatech makes no qualification claim of its own.

Which certificate numbers can a Czech quality engineer verify without asking us?

Five, and they sit on 8 of the 451 pages. We found every occurrence. All five are on the safety capacitor series only, and none of them covers an MLCC outside S2, S2-H and S3.

Certificate	Body	Series	Documents and pages we found it on
E182369	UL file	S2, S2-H, S3	16, 17, 18, each on pages 2 and 3, plus 00_MLCC_Full_Catalogue.pdf pp 38 and 41
R50381780	TUV	S2, S2-H, S3	the same 4 documents, 8 pages
R50195920	TUV	S2-H, S3	3 documents, 3 pages
CQC20001280137	CQC	S2	16_Safety_X1Y2_General_S2.pdf only, pages 2 and 3
CQC20001280136	CQC	S3	00_MLCC_Full_Catalogue.pdf p 41 and 16_Safety_X1Y2_General_S2.pdf p 2

Note the last row, because it is a trap for anyone assembling a package from the series sheets alone. The S3 series’ own CQC number is not printed in 18_Safety_X2_S3.pdf. We checked all 12 pages of that file: it carries three of the five numbers on pages 2 and 3 and not its own CQC reference, which sits in the catalogue and in the S2 sheet instead. S3 is also one of six series with a full approval sheet and zero rows in the parametric export, so no S3 part number can be quoted or crossed today — see AVL submission documentation, what we hold.

Check us. UL file E182369 is in UL’s public database. Your quality engineer can confirm it in thirty seconds without taking our word for anything. So can the first line of our own position: an authorised Walsin Technology distributor in Hong Kong — confirm it with Walsin.

Does any Walsin document we hold state lot traceability or a date code?

Not one word, on any of the 451 pages. We searched all 28 documents for four terms a supplier-approval questionnaire always carries — “traceability”, “lot code” or “lot number”, “date code”, and “batch”. All four return zero pages and zero documents. 18 of 28 documents do discuss a customer label and a serial number of the label, which is a packaging convention, not a traceability statement. We have not seen this counted anywhere.

Lot and date-code traceability, a certificate of conformity per shipment on request, and original sealed Walsin packaging are our commitments as the authorised channel. They are not claims lifted from a manufacturer document and we will not present them as though they were. Ask us for them in writing, and ask Walsin separately for a manufacturing traceability statement; a tier-1 audit treats those as two different pieces of paper.

While you are asking: 22 of the 28 documents route the reader to a local Walsin representative, product engineer or liaison across 110 of the 451 pages. 6 never do, and both chip resistor sheets are among the 6 — so on the two highest-volume resistor documents in our library there is no stated route back to the manufacturer at all. For the paperwork sequence a tier-1 runs, see tier-1 submission documentation for automotive passives.

What does Walsin’s own change-control wording say, and why does a tier-2 need more than that?

It reserves the right to change or withdraw without notice, and we counted where. 27 of the 28 documents carry a “subject to change” reservation — on page 1 of 26 of them and on page 3 of the full catalogue. The one that does not is 00_MLCC_Application_Guide.pdf, 12 pages. The catalogue puts it at its strongest, in this sentence: “The specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.” We hold no affected-part list for any manufacturer and we will never tell you that a particular part number is affected — nobody has given us a list to read from.

That sentence is not a weakness in the argument; it is the argument. A Czech tier-2 on a multi-year model programme cannot accept “without advance notice” as the change-control position, and quoting Walsin’s own wording is the cleanest way to justify asking for a written notification arrangement. It is on our request list. Nothing has been sent in writing yet, and we will not tell you a document has been requested until it has.

What should a Czech Republic tier-2 supplier ask us for first?

The named part number, then the gap list. We hold 28 Walsin datasheets, 451 pages. Ask for the one covering your part number and it will be in your inbox, not in a brochure — and if the answer is that no page covers it, as it is for all 12,871 SR resistors, you get that answer on the same day instead of three weeks into a submission.

1. Send the automotive lines off your bill of materials and ask which document governs each one. We will tell you where the wording is “compliant” rather than “certified”, and where there is no page at all.
2. Cross the whole list 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 stated difference rather than a claimed match.
3. Check what is physically in Hong Kong on ready stock — 1,125 part numbers as at 23 September 2026, a dated snapshot and not a live feed.

Our line runs from Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation, and nowhere else. Unit 207, 2/F, Sun Ling Plaza, 30 On Kui Street, Fanling, N.T., Hong Kong. (852) 2628 4777. The full line sits on the Walsin MLCC page.

The short version

Eighteen document types a Czech tier-2 submission asks for return zero pages across the 451 we hold, and we re-ran every search ourselves. Five third-party certificate numbers sit on 8 of those 451 pages, all on the safety capacitor series, and the S3 sheet does not print its own CQC number. Traceability, lot code, date code and batch return zero on all four terms, so those commitments are ours and not a manufacturer’s. 27 of 28 documents reserve the right to change without notice. AEC-Q200 is compliant, never certified, and we hold no qualification report for any part. We hold neither ISO 9001 nor IATF 16949. Qualification stays with you, and so does the submission — our job is to make sure nothing in your package is a guess.

Send us the automotive lines off your Czech bill of materials and we will return a document-by-document position on each one: which page governs it, which wording Walsin actually uses, and which of the eighteen we cannot supply today. And a question back: which of those eighteen has your tier-1 already asked for in writing, and which did you assume you had?

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Frequently asked questions

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