An 0603 X7R 100 nF 50 V line crosses to 13 real Walsin Technology (Walsin) parts across
six series. All 13 share a nominal 0.80 mm thickness, but eight are toleranced +0.15/−0.10
mm and five are ±0.30 mm. Tolerance, termination and AEC-Q200 status split them further.
Confirm your current part’s status with Murata, and qualify any candidate yourself.
What does a field-by-field 0603 X7R cross actually compare?
Nine fields, each marked match or mismatch. Case size, dielectric, capacitance and rated
voltage are the four the BOM already states. Tolerance, thickness with its tolerance band,
termination system, AEC-Q200 status and the orderable packaging suffix are the five that
decide whether the part builds, passes audit and ships.
You bring the left-hand column. Venatech Limited, an authorised Walsin distributor in Hong
Kong, fills the right-hand columns from Walsin’s own measured data. We do not reproduce
another manufacturer’s specifications, and we do not characterise another manufacturer’s
lifecycle status. Read your current part’s figures off its own datasheet and write them in.
| Field | Your Murata part — fill in from its datasheet | Walsin 0603B104K500 |
Match / mismatch |
|---|---|---|---|
| Case size | 0603 | ||
| Dielectric | X7R | ||
| Capacitance | 100 nF | ||
| Rated voltage | 50 Vdc | ||
| Capacitance tolerance | ±10% | ||
| Thickness, nominal | 0.80 mm | ||
| Thickness tolerance | +0.15 / −0.10 mm | ||
| Worst-case thickness | 0.95 mm | ||
| Soft termination | No | ||
| AEC-Q200 | Not claimed for this series | ||
| Order code suffix | CT required → 0603B104K500CT |
Walsin figures from the
General Purpose MLCC datasheet.
Fill the middle column from your own datasheet, mark each row, and the decision becomes
visible instead of implied.
How many Walsin parts sit on an 0603 X7R 100 nF 50 V line?
Thirteen, across six series. Three in the AEC-Q200 automotive MT series, two in the MG
series, two in the AEC-Q200 soft-termination ST series, three in General Purpose, one in the
Cu-poly SG soft-termination series and two in the Ag-poly SH soft-termination series. They
are not interchangeable with each other, let alone with anything else.
| Walsin part number | Series | Tolerance | Thickness | Worst-case T | Soft termination | AEC-Q200 | Match / mismatch vs a plain 0603 X7R 100 nF 50 V call-out |
|---|---|---|---|---|---|---|---|
0603B104J500 |
General Purpose | ±5% | 0.80 +0.15/−0.10 | 0.95 mm | No | Not claimed | Match electrically · mismatch if ±10% was the requirement — this is tighter |
0603B104K500 |
General Purpose | ±10% | 0.80 +0.15/−0.10 | 0.95 mm | No | Not claimed | Match on all four electrical fields and ±10% |
0603B104M500 |
General Purpose | ±20% | 0.80 +0.15/−0.10 | 0.95 mm | No | Not claimed | Mismatch — ±20% is looser than a ±10% call-out |
MT18B104J500 |
Automotive MT | ±5% | 0.80 +0.15/−0.10 | 0.95 mm | No | Qualified | Match electrically · mismatch on tolerance width |
MT18B104K500 |
Automotive MT | ±10% | 0.80 +0.15/−0.10 | 0.95 mm | No | Qualified | Match on electrical fields, tolerance and qualification |
MT18B104M500 |
Automotive MT | ±20% | 0.80 +0.15/−0.10 | 0.95 mm | No | Qualified | Mismatch — ±20% tolerance |
MG18B104J500 |
Automotive MG | see flag below | 0.80 +0.15/−0.10 | 0.95 mm | No | Series title: not certified | Mismatch — AEC-Q200 not certified |
MG18B104K500 |
Automotive MG | see flag below | 0.80 +0.15/−0.10 | 0.95 mm | No | Series title: not certified | Mismatch — AEC-Q200 not certified |
ST18B104K500 |
Automotive soft term ST | ±10% | 0.80 ±0.30 | 1.10 mm | Yes | Qualified | Match on tolerance and qualification · mismatch on worst-case height |
ST18B104M500 |
Automotive soft term ST | ±20% | 0.80 ±0.30 | 1.10 mm | Yes | Qualified | Mismatch — ±20% and worst-case height |
SG18B104K500 |
Soft term SG, Cu-poly | ±10% | 0.80 ±0.30 | 1.10 mm | Yes | Not claimed | Mismatch — worst-case height; AEC-Q200 not claimed |
SH18B104J500 |
Soft term SH, Ag-poly | ±5% | 0.80 ±0.30 | 1.10 mm | Yes | Not claimed | Mismatch — tolerance width, worst-case height |
SH18B104K500 |
Soft term SH, Ag-poly | ±10% | 0.80 ±0.30 | 1.10 mm | Yes | Not claimed | Match on tolerance · mismatch on worst-case height |
Dimensions and tolerances from the Walsin
General Purpose,
MT,
MG,
ST,
SG and
SH
datasheets, cross-checked against Walsin’s parametric export, September 2026.
Why is thickness the field that breaks this cross?
Because the nominal is identical on all 13 parts and the tolerance band is not. Every one of
the 13 is 0.80 mm nominal thick. Eight carry +0.15/−0.10 mm, so worst case is 0.95 mm. Five
carry ±0.30 mm, so worst case is 1.10 mm and best case is 0.50 mm. A height budget written
against the nominal will pass on paper and fail on the line.
Unique to Venatech’s data. All 13 Walsin parts on an 0603 X7R 100 nF 50 Vdc line share
a 0.80 mm nominal thickness, but they split into two tolerance bands — eight
hard-termination parts at 0.80 +0.15/−0.10 mm and five soft-termination parts at
0.80 ±0.30 mm. The soft-termination worst case of 1.10 mm sits above the 1.00 mm ceiling
in Walsin’s own wave soldering recommendation for 0603, while the hard-termination worst
case of 0.95 mm sits below it. One nominal thickness, two process answers.
The width tolerance moves with it. The soft-termination parts are 1.60 ±0.30 mm long and
0.80 ±0.30 mm wide, against 1.60 +0.15/−0.10 and 0.80 +0.15/−0.10 for the hard-termination
parts. If the footprint was drawn tight to the nominal, a ±0.30 mm body is a placement and
solder-bridge question, not just a height question.
How do I tell which of the 13 has soft termination?
From the series, and only from the series. ST is the AEC-Q200 automotive soft-termination
series. SH is the Ag-poly soft-termination series. SG is the Cu-poly soft-termination
series. MT, MG and the General Purpose 0603 parts are not soft-termination series. Nothing in
the parametric data will tell you this.
Unique to Venatech’s data. Walsin’s combined MLCC export declares a
Termination
column, populates it on 1,106 of 24,026 rows, and every one of those 1,106 values is a
tolerance string —+-10%,+-5%,+-0.1pF,-0.05. There is no termination data in
the export at all.PackingandSPQare declared and empty on all 24,026 rows. Three of
the nine fields this cross needs cannot be answered from Walsin’s public parametric search.
The two soft-termination chemistries are not the same thing either. SG is copper-polymer and
SH is silver-polymer. Both address board flex; they are separate datasheets with separate
test data. Moving a line from one to the other is itself a cross that needs marking.
Which of the 13 are AEC-Q200 qualified?
Five. The three MT parts and the two ST parts sit in series whose titles and datasheets state
AEC-Q200 qualification. The two MG parts sit in a series whose own title is “Automotive Caps
Without AEC-Q200 Certification”. General Purpose, SG and SH make no AEC-Q200 claim in their
series datasheets.
That produces an awkward but honest result for an automotive line that also needs soft
termination: only ST18B104K500 and ST18B104M500 carry both, and one of those is ±20%.
There is no ±5% AEC-Q200 soft-termination part on this line in the Walsin catalogue. The
brief has to give somewhere, and the engineer decides where.
What about DC bias behaviour at the working voltage?
Read it from the series datasheet curve at your actual working voltage, not from a data
table. An X7R 0603 100 nF part at 50 V rating loses capacitance as DC bias rises, and the
loss differs between series because the active volume differs. This is the field most likely
to change circuit behaviour after a cross that matched on paper.
Unique to Venatech’s data. Walsin’s per-part MLCC export declares a
DC Bias 25
column alongsideIRandDF. All three are empty on every one of the 173 rows in the
sample that carries datasheet URLs. There is no published per-part DC bias figure to
cross against. The curve in the series datasheet is the only source, and it has to be read
at your working voltage, not at the rated voltage.
Practical consequence: if your node runs at 24 V on a 50 V part, both the incumbent and the
candidate need their curve read at 24 V and the delivered capacitance compared there. Two
parts that both say 100 nF ±10% can deliver materially different capacitance at the same
bias.
Does tolerance narrow the list further than expected?
Yes, and in an unhelpful direction. On this line Walsin offers ±5% in General Purpose, MT and
SH; ±10% in General Purpose, MT, ST, SG and SH; ±20% in General Purpose, MT and ST. A ±5%
requirement removes ST and SG entirely, which removes the AEC-Q200 soft-termination option
and the Cu-poly option in one step.
A tighter tolerance is electrically safe — a ±5% part sits inside a ±10% window — but it is
a sourcing constraint, not a specification improvement. If the BOM says ±10%, ask for ±10%
and let the ±5% parts be candidates rather than requirements.
Which of these can I order, and what suffix does the order code need?
The order code is the catalogue part number plus CT. Three of the 13 appear in Venatech’s
Hong Kong stock snapshot dated 23 September 2026: 0603B104K500CT, 0603B104M500CT and
SH18B104K500CT. The other ten are catalogue parts to be ordered, not snapshot lines.
| Catalogue part number | Order code as shipped | In the 23 September 2026 snapshot |
|---|---|---|
0603B104K500 |
0603B104K500CT |
Yes |
0603B104M500 |
0603B104M500CT |
Yes |
SH18B104K500 |
SH18B104K500CT |
Yes |
| The remaining ten above | catalogue code + CT |
No — order lines |
Stock is a snapshot, not a standing position, and the figures behind it are part-number
counts rather than quantities. Ask for a current confirmation before you plan a build around
any of them.
None of this approves a cross. Confirm every field against both datasheets — Walsin’s series
datasheet and the datasheet for the part you buy today — confirm your current part’s status
with Murata or your Murata distributor, and qualify the candidate in your own circuit before
release.
FAQ
How many Walsin parts cross an 0603 X7R 100 nF 50 V line?
Thirteen, across six series: three General Purpose, three automotive MT, two automotive MG, two automotive soft-termination ST, one Cu-poly SG and two Ag-poly SH. They differ in tolerance, thickness tolerance band, termination system and AEC-Q200 status, so the 13 are not substitutes for one another.
Are all 0603 X7R 100 nF 50 V parts the same thickness?
No. All 13 Walsin parts share a 0.80 mm nominal, but eight are toleranced +0.15/−0.10 mm and five are ±0.30 mm. Worst case is 0.95 mm for the hard-termination parts and 1.10 mm for the soft-termination parts. A height budget written against the nominal alone will not catch it.
Which Walsin 0603 X7R 100 nF 50 V part is AEC-Q200 qualified and soft-terminated?
Only the ST series parts, ST18B104K500 at ±10% and ST18B104M500 at ±20%. There is no ±5% option with both properties on this line. The MT parts are AEC-Q200 qualified but not soft-terminated; SH and SG are soft-terminated but make no AEC-Q200 claim.
Can I read termination type from Walsin’s parametric export?
No. The Termination column is populated on 1,106 of 24,026 rows and every populated value is a tolerance string, not a termination type. Packing and SPQ are empty on every row. Termination, packaging and supplied quantity all have to come from the series datasheet or from a confirmed quotation.
Where do I find the DC bias curve for these parts?
In the series datasheet, and you read it at your working voltage rather than the rated voltage. Walsin’s per-part export declares a DC bias column but it is empty on all 173 rows in the sample set, so there is no per-part figure to compare. The curve is the only source.
Is a specific Murata 0603 X7R part still available?
We cannot answer that. Venatech holds no Murata lifecycle data, affected-part list or allocation information, and nothing here states or implies the status of any Murata part number. Ask Murata or your Murata distributor in writing, then use this table for the Walsin side.
What suffix does a Walsin MLCC order code need?
CT. Walsin’s parametric export omits it, so an exported part number is not orderable as written. 0603B104K500 becomes 0603B104K500CT on a purchase order. Of the 1,125 distinct part numbers in Venatech’s 23 September 2026 snapshot, 865 order codes carry the suffix.
Does moving from SG to SH count as a like-for-like change?
No. SG is copper-polymer soft termination and SH is silver-polymer. Both address board flex, both have their own datasheet and their own test data, and both differ from the hard-termination series in dimensional tolerance. Changing between them is itself a cross that needs marking field by field.
Next step
Send the line, not the part number alone: case size, dielectric, value, rated voltage,
tolerance, height budget, whether AEC-Q200 is required and whether board flex is a known
risk. Venatech Limited, an authorised Walsin distributor in Hong Kong, will return the
candidate table above filled in for your specification, with every mismatch marked and the
orderable suffix on each row.
Send your BOM to Venatech · Browse the
Walsin MLCC range · Read
Soft termination MLCC: SH, SG, ST and VT and
The CT suffix: orderable Walsin part numbers.
Cross it yourself. The cross-reference tool takes a single part number or a whole BOM column and returns the Walsin candidates with every field that differs stated plainly — qualification stays with you. Ready stock shows what is held in Hong Kong today, with an RFQ against any line.