Stop Crossing Parts One at a Time. Paste 500 and Get an RFQ.

VenaMatch takes a whole list. Its first question offers “I have a list”, and the helper
text says a list can be a BOM extract, an EOL notice, or anything pasted from a spreadsheet.
Two formatting faults stop pasted lines matching: an embedded space inside a Walsin
Technology (Walsin Technology (Walsin)) part number, and a missing CT packaging suffix.

Venatech Limited, an authorised Walsin distributor in Hong Kong, built the list path because
buyers do not arrive with one part. They arrive with a column. This post covers what to
paste, what breaks, and why.

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What can I paste into a BOM cross reference tool?

A column of part numbers, in whatever state it reached you. VenaMatch asks first whether you
have one part or a list, then which product category — ceramic capacitors or chip resistors
— then takes the list. It identifies each manufacturer from the part number itself, so there
is no vendor to select line by line.

That is what makes a list practical: a mixed BOM extract does not need sorting by vendor
before it can be crossed.

The helper text is deliberately loose about format because real inputs are. What matters is
not the container but whether the strings inside it are the part numbers they appear to be.

How does Walsin’s own tool take a list?

Two ways. Walsin’s cross-reference search, at cross.passivecomponent.com, accepts multiple
items comma-separated in the entry field, or an Excel file upload, with a sample file linked
for the format. It covers MLCC and CHIP-R, in 繁體中文, 简体中文, English and 日本語.

Its four-step form asks you to choose the product type, say whether the number is Walsin’s
or a competitor’s, name the competitor from a list of 22 named vendors plus “Unknown”, then
enter the part numbers and query. Naming the vendor yourself makes sense on a manufacturer’s
page.

The two tools do different halves of the job here as well. Walsin’s tool ends at a suggested
Walsin part, which is the whole of what a manufacturer that does not sell direct can
responsibly do. VenaMatch carries the same answer into a quantity and an RFQ line, because
Venatech is the authorised distributor and can quote it. A manufacturer identifies; a
distributor supplies.

Why do pasted BOM lines fail to match?

Almost always for a formatting reason rather than a catalogue one. Two faults account for
most of it. A Walsin chip resistor part number may contain a space in the middle. A Walsin
MLCC order code may need a packaging suffix that the catalogue code does not carry.

Both are invisible on screen. A space inside a part number looks like a formatting artefact,
so it survives a copy and paste and then fails every exact match. A missing suffix looks like
nothing at all: the code is a valid catalogue key and simply is not the orderable code.

Here is a worked list, every line a real Walsin part number from our data.

Pasted code	Product line	Pastes as one clean string	Orderable exactly as pasted	Match / mismatch
0603B104K500	MLCC	Yes	No — order code is 0603B104K500CT	Mismatch — packaging suffix missing
0603B104M500	MLCC	Yes	No — order code is 0603B104M500CT	Mismatch — packaging suffix missing
SH18B104K500	MLCC, soft termination SH	Yes	No — order code is SH18B104K500CT	Mismatch — packaging suffix missing
1210F476Z10	MLCC	Yes	Yes — this line carries no suffix	Match — one of only two ceramic lines in our snapshot without a CT order code
WR06X1001FTL	Chip resistor, ±1%	Yes	Yes	Match
WR06X102 JTL	Chip resistor, ±5%	No — embedded space	No	Mismatch — the space splits the string
WR12F1R0 JTL FN	Chip resistor	No — two embedded spaces	No	Mismatch — the string splits into three
MF12E1R00FTL	Chip resistor	Yes	Yes	Match

Three of those eight lines are a paste away from failing, and none of the three is wrong in
any other sense. They are correct Walsin part numbers written in a form a search box cannot
take literally.

Which Walsin part numbers will not paste cleanly?

39,576 of the 234,815 Walsin chip resistor part numbers in our extract contain an embedded
space. That is 16.9% of the line. They fall into four structural patterns, all verified by
counting the strings rather than by reading a document.

Pattern	Count	Real example	Match / mismatch on a literal paste
Stem + space + 3 characters	26,114	WF04A000 PTL	Mismatch — splits into two tokens
Stem + space + 4 characters	12,466	WK25S1R0 KTLJ	Mismatch — splits into two tokens
Full part number + space + 2 characters	921	WR20F1R00FTL HN	Mismatch — trailing suffix detaches
Two spaces	75	WR12F1R0 JTL FN	Mismatch — splits into three tokens

Unique to Venatech’s data. The two paste failures land on different product lines.
Every one of the 39,576 affected part numbers is a chip resistor; none is an MLCC. In our
stock snapshot dated 23 September 2026, the reverse holds for the suffix problem: 865 of
the 867 ceramic capacitor lines carry a CT suffix on the order code that the catalogue
code does not, and none of the 258 chip resistor, inductor, array and other lines carry
one. Two product lines, two different reasons a pasted BOM line does not match. Counts are
part numbers, not pieces.

There is a neat illustration inside a single resistance value. At 0603 and 1 kΩ, all 32
Walsin parts at ±5% carry an embedded space and none of the 34 at ±1% do. WR06X1001FTL
pastes; WR06X102 JTL does not. Same series, same case size, same resistance, one tolerance
step apart. The full account is in
Why Walsin part numbers do not paste into your BOM.

Why does my stock list show a different code from the catalogue?

Because the catalogue code is a specification key and the order code carries packaging.
Walsin’s MLCC parametric export omits the CT suffix, so a part number taken from that
export is not orderable as it stands. Our stock snapshot lists both columns side by side for
exactly that reason.

The figures: the snapshot dated 23 September 2026 holds 1,125 part numbers, and 865
of them differ between the order code and the catalogue code — in every case by a trailing
CT. Two ceramic lines in that file are exceptions worth knowing about: 1210F476Z10
carries no suffix, and S252B471K502ZT ends in ZT rather than CT.

If a purchase order goes out with a catalogue code, someone will come back and ask. Paste the
catalogue code into a cross tool; put the order code on the PO. See
The CT suffix: orderable Walsin part numbers.

What should each BOM line contain before you paste it?

A part number with no stray spaces, and enough specification to check the result against.
Four fields per line is the working minimum for a ceramic capacitor: case size, dielectric,
capacitance and rated voltage, plus tolerance if you have it. For a chip resistor: case size,
resistance, tolerance and rated power.

Include the description column even when it duplicates the part number. When the two
disagree, that disagreement is the most useful thing in the file, and the line is worth a
second look before it goes into a build.

Three preparation steps pay for themselves. Strip leading and trailing spaces from every
cell. Flag any interior space so the cross runs on the intended string. Keep quantities in a
neighbouring column, because quantity is what turns a result into a quote.

What comes back from a list cross?

The same thing a single cross returns, line by line: the decoded incumbent, the closest
Walsin part with its series and grade, and a field-by-field match list with a tick against
each field that matches. Then the quantity question, and Add to RFQ.

The match list is the part to read rather than skim. On a ceramic capacitor it covers case
size, dielectric, capacitance, tolerance and voltage. It does not cover dimensional
tolerance or qualification grade, because a BOM line does not usually state either — and
both can decide the design. One 0603 X7R 100 nF 50 V line crosses to 13 different Walsin
parts once grade and termination are counted: see
One specification, 13 Walsin parts.

Walsin’s own cross-reference instructions make the same point at step four: double check the
thickness and tolerance of the suggested part to ensure accuracy. On a single line that is
one check. On a 200-line BOM it is the reason the flow ends at a person rather than a
download.

Does crossing a BOM give me approved substitutions?

No, and the tool says so on every result. VenaMatch’s standing note reads: this is a
specification match against Walsin’s published catalogue, offered as a candidate for your
evaluation. It is not an approved substitution. Check the datasheet, and qualify the part in
your application, before production use.

That applies to the two-hundredth line as much as the first. A long list does not become
approved by being long. Walsin’s own preamble says the same thing from the manufacturer’s
side: you must evaluate the suggested replacement and conduct necessary tests before
proceeding with mass production.

A crossed BOM with quantities against it is a document a person can work through in one pass
instead of twenty emails. That is what the RFQ line is for.

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FAQ

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Next step

Paste the column, quantities included, and let the mismatches come back in writing rather
than in a phone call three weeks later.

Cross a list with VenaMatch · Send your BOM to Venatech ·
Browse the Walsin chip resistor range · Read
Why Walsin part numbers do not paste into your BOM
and The CT suffix: orderable Walsin part numbers.