A low profile MLCC buys you height, and the orderable part number does not record how much. Walsin Technology (Walsin) publishes 57 rows in its Low Profile TT series. On 51 of the 53 that have a directly comparable part elsewhere in the catalogue, the TT part is thinner — by 0.20 mm at 0402 and by 1.65 mm at 1210. The TT ordering key has no thickness field.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds Walsin’s full MLCC
parametric export and 26 MLCC datasheet PDFs, including the Low Profile TT approval sheet
ASC_Low Profile_(TT)_009S_AS, dated April 2026. This post is written from both. Every part
number below is real and appears in Walsin’s own data. Counts are of part numbers and rows, not
pieces.
What is Walsin’s low profile MLCC series?
TT is a 57-row series built for designs where board-to-enclosure clearance, not capacitance, is the binding constraint. The datasheet names LCD panels, PCMCIA cards and IC packaging as the target applications. Dielectrics are X5R (52 rows) and X7R (5 rows); there is no Class I option. Five case sizes are published — 0402, 0603, 0805, 1206 and 1210.
The ordering key, from section 4 of the approval sheet, is:
TT · size (15=0402, 18=0603, 21=0805, 31=1206, 32=1210) · dielectric (B=X7R,
X=X5R) · capacitance · tolerance (K=±10%, M=±20%, Z=−20/+80%) · rated voltage ·
termination (C) · packaging (T=7″ reel, G=13″ reel).
Eight fields. None of them is thickness. That matters, because at two of the five case sizes Walsin publishes two thicknesses.
How much height does a TT part actually save?
Between 0.20 mm and 1.65 mm, depending on case size. We took every TT row and looked for parts elsewhere in the 24,026-row MLCC export that share all five fields an engineer normally ticks — case size, dielectric, capacitance, tolerance and rated voltage — then compared published thickness.
| TT part | Case | Capacitance / voltage | TT thickness | Five-field twin | Twin thickness | Match / mismatch |
|---|---|---|---|---|---|---|
TT15X105K6R3 |
0402 | 1 µF, 6.3 V | 0.30 ± 0.03 mm | 0402X105K6R3 |
0.50 ± 0.05 mm | Mismatch — 0.20 mm thinner |
TT18X475K100 |
0603 | 4.7 µF, 10 V | 0.50 ± 0.10 mm | 0603X475K100 |
0.80 +0.15/−0.10 mm | Mismatch — 0.30 mm thinner |
TT21X106K100 |
0805 | 10 µF, 10 V | 0.85 ± 0.10 mm | 0805X106K100 |
1.25 ± 0.20 mm | Mismatch — 0.40 mm thinner |
TT31X475K250 |
1206 | 4.7 µF, 25 V | 0.85 ± 0.10 mm | 1206X475K250 |
1.60 +0.30/−0.10 mm | Mismatch — 0.75 mm thinner |
TT32X106K250 |
1210 | 10 µF, 25 V | 0.85 ± 0.10 mm | 1210X106K250 |
2.00 / 2.50 mm | Mismatch — 1.15 to 1.65 mm thinner |
TT32B225K101 |
1210 | 2.2 µF, 100 V | 2.50 ± 0.50 mm | 1210B225K101 |
2.50 ± 0.50 mm | Match — no height saving at all |
The useful pattern is that one thickness, 0.85 ± 0.10 mm, serves 0805, 1206 and 1210. If your enclosure gives you 1 mm of component height, the TT series lets you move up two case sizes — and therefore up in capacitance and voltage — without touching your Z-height budget. The standard part at 1210 is two to three times as tall.
A second useful detail: the 0603 TT part is thinner than its soft-termination counterpart as well.
SH18X475K100 publishes 0.80 ± 0.30 mm against the TT part’s 0.50 ± 0.10 mm, and the wider
tolerance on the soft-termination part means its worst case is 1.10 mm against the TT part’s
0.60 mm. Soft termination and low profile are not available in the same part; if you need both
flex-crack protection and height, that is a conversation with Walsin, not a catalogue selection.
Why the polymer layer widens the dimension is covered in
Soft termination MLCC: SH, SG, ST and VT.
Why does one TT part number list two different thicknesses?
Because thickness has no field in the part number, and the export lists the same code twice.
TT31X106K100 — 1206, X5R, 10 µF, ±10%, 10 Vdc — appears on two rows of Walsin’s export. One
gives 0.85 ± 0.10 mm with thickness symbol T. The other gives 1.15 ± 0.15 mm with symbol J.
Both figures are legitimate 1206 options in the datasheet’s own dimension table. They are also
different parts: section 8 of the approval sheet reels the 0.95 mm maximum version on paper tape
at 4,000 pieces and the 1.30 mm maximum version on plastic tape at 3,000. Nothing in the
orderable code distinguishes them.
This is not confined to TT. Measured across the whole MLCC export:
| Measure | Count |
|---|---|
| Rows in the MLCC export | 24,026 |
| Distinct part numbers | 23,601 |
| Part numbers appearing on more than one row | 399 |
| … of those, rows disagree on published thickness | 381 |
| … of those, the nominal thickness differs, not just the tolerance | 344 |
| Largest nominal gap on one part number | 1.25 mm (1210B474K101, 1.25 mm and 2.50 mm) |
All 344 sit inside a single series — the duplicate is never an artefact of two series sharing a
code. The series most affected are Middle to High Voltage 200 V–4 kV (416 rows), General Purpose
(183) and soft termination SH (66). 1210B224K251 is published at 1.60 mm and 2.50 mm;
1210N153K631 at 1.60 mm and 2.50 mm; 1206B102J202 at 0.80 mm and 1.60 mm. In every case the
thickness symbol differs — G against M, D against M, T against J — and the symbol is
not in the part number either.
So if you are building a height-constrained board, a part number plus a five-field parametric match does not pin down the part. On 344 codes it gives you two possible heights.
Is every part in the Low Profile series low profile?
No. One of the 57 is not.
TT32B225K101 is the only 100 V part in the series and the only X7R 1210. It publishes
2.50 ± 0.50 mm — the same thickness as the General Purpose 1210B225K101, the AEC-Q200
automotive MT32B225K101 and the soft-termination SH32B225K101 at the same 2.2 µF and 100 V.
It is the only TT row that is not thinner than its five-field twin, and at 3.00 mm worst case it
is the tallest part in a series named for not being tall.
There is a second problem with that row. The datasheet’s own dimension table gives the 1210
symbol K thickness as 2.00 ± 0.20 mm. The export says 2.50 ± 0.50 mm. The two documents
disagree by 0.5 mm of nominal and by two and a half times on tolerance, on the one part where
the number matters most.
| Source | 1210 symbol K thickness |
Worst case |
|---|---|---|
| TT approval sheet, section 5 dimension table | 2.00 ± 0.20 mm | 2.20 mm |
| TT approval sheet, section 8 packaging table | 2.00 mm max | 2.00 mm |
Parametric export row for TT32B225K101 |
2.50 ± 0.50 mm | 3.00 mm |
| Match / mismatch | Mismatch | 0.80 mm of disagreement |
How do I order a specific thickness?
State the maximum height in millimetres on the enquiry and on the purchase order, alongside the part number. Do not rely on the code. For TT the thickness symbols are published, so you can also name the symbol:
| Case size | Symbol | Nominal thickness | Reel |
|---|---|---|---|
| 0402 (1005) | L |
0.30 ± 0.03 mm | paper, 15k |
| 0603 (1608) | H |
0.50 ± 0.10 mm | paper, 4k |
| 0805 (2012) | T |
0.85 ± 0.10 mm | paper, 4k |
| 1206 (3216) | T or J |
0.85 ± 0.10 mm or 1.15 ± 0.15 mm | paper 4k / plastic 3k |
| 1210 (3225) | T or K |
0.85 ± 0.10 mm or 2.00 ± 0.20 mm | plastic 3k / plastic 1k |
Source: ASC_Low Profile_(TT)_009S_AS, sections 5 and 8, held on file by Venatech and published
by Walsin at the
Low Profile TT datasheet.
The same discipline applies to reflow. A 0.30 mm part at 0402 has far less thermal mass than the 0.50 mm standard part, and Walsin’s process guidance is written for the standard body. The mounting and profile rules are in MLCC reflow profile and mounting.
What is the TT series rated for?
X7R runs 1 µF to 10 µF at 10, 16, 25, 50 and 100 Vdc, −55 to +125 °C. X5R runs 0.22 µF to 47 µF at 6.3, 10, 16 and 25 Vdc, −55 to +85 °C. Both are specified at ±15% capacitance change over temperature. Dielectric strength is 250% of rated voltage for 1 to 5 seconds; insulation resistance is ≥10 GΩ or RxC ≥100 Ω·F, whichever is smaller.
Two things in the export sit outside that general electrical data table. TT31X476M6R3 is a
47 µF 1206 at 6.3 V — the top of the X5R range, and present in the datasheet’s capacitance table
but above the 22 µF figure our datasheet index recorded for this series. And TT31X105K500 is an
X5R part at 50 Vdc, while section 6 of the approval sheet lists X5R voltages as 6.3, 10, 16 and
25 V only. The datasheet’s own X5R capacitance table does carry a 50 V column at 1206 with 1 µF
in it, so the approval sheet contradicts itself rather than contradicting the export.
As always with a Class II dielectric, the published capacitance is not the capacitance you get in circuit. DC bias at 25 Vdc on an X5R part of this capacitance removes a large fraction of it; MLCC DC bias and voltage derating has the measured curves. The full MLCC range is on the Walsin MLCC range page.
Which TT rows are incomplete?
One. TT31X335K250 — 1206, X5R, 3.3 µF, ±10%, 25 Vdc — carries a thickness symbol of T and no
L, W or T dimension at all. The symbol implies 0.85 ± 0.10 mm by the dimension table, and a
sibling row, TT31X335M160, at the same case size and capacitance publishes exactly that. We
would treat the part as 0.85 ± 0.10 mm, and we would still ask.
That makes the honest arithmetic on this series: 57 rows, 56 distinct part numbers, 53 with a directly comparable part elsewhere in the catalogue, 51 genuinely thinner, 1 no thinner at all, and 1 with no dimensions published.
The short version
TT is the right series when height is the constraint and you can live with X5R or X7R. The saving
is real and it is largest at the big case sizes: 0.85 mm at 1206 and 1210 against 1.60 mm and
2.00–2.50 mm standard. One thickness covers 0805, 1206 and 1210, so a 1 mm height budget stops
limiting your capacitance. Two things to carry into the design review: TT32B225K101 is not a
low profile part and its two sources disagree by 0.8 mm worst case, and 344 MLCC codes across the
catalogue — TT31X106K100 among them — are published at two different nominal thicknesses under
one orderable number.
Send us the height budget and the capacitance you need and we will come back with the TT part numbers that fit, the thickness symbol for each, and the datasheet page it comes from. Or give us one part number and ask us to cross it.
Faster than an email. The cross-reference tool takes a pasted list or a spreadsheet and returns Walsin ceramic capacitor candidates field by field, differences included. Ready stock shows what is physically in Hong Kong, so you can see straight away whether a line is a stock pull or a production slot.
Frequently asked questions
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What is a low profile MLCC?
A multilayer ceramic capacitor built thinner than the standard part in the same case size, for designs limited by board-to-enclosure clearance rather than capacitance. Walsin’s low profile range is the TT series: 57 published rows, 0402 to 1210, X5R and X7R, 0.22 µF to 47 µF.
How thin is Walsin’s thinnest MLCC in the TT series?
0.30 ± 0.03 mm, at 0402. Four TT rows sit at that thickness, including TT15X105K6R3, a 1 µF 6.3 V X5R part. The equally rated General Purpose part 0402X105K6R3 is published at 0.50 ± 0.05 mm, so the TT part saves 0.20 mm of nominal height.
Does the Walsin part number tell me the thickness?
No. The TT ordering key has eight fields — series, size, dielectric, capacitance, tolerance, rated voltage, termination and packaging — and none of them is thickness. At 1206 and 1210 Walsin publishes two thicknesses per case size under separate symbols that do not appear in the code. State a maximum height on the order.
Why is the same MLCC part number listed twice with different thicknesses?
Walsin’s export contains 24,026 rows for 23,601 distinct part numbers. 344 of those codes appear on two rows whose nominal thickness differs, always inside one series, with gaps up to 1.25 mm. Venatech has flagged this for written confirmation and recommends specifying a maximum height rather than relying on the code.
Is every part in Walsin’s Low Profile series actually low profile?
No. TT32B225K101, the only 100 V X7R part in the series, is published at 2.50 ± 0.50 mm, which is the same thickness as the General Purpose, automotive MT and soft-termination SH parts at the same 2.2 µF and 100 V. It is the one TT row with no height advantage over its catalogue twin.
Can I get a soft termination low profile MLCC from Walsin?
Not as a catalogue part. Soft termination is the SH, SG, ST and VT series and low profile is TT; no part number carries both. At 0603 the TT part is thinner than the soft-termination part in any case — 0.50 ± 0.10 mm against 0.80 ± 0.30 mm on SH18X475K100. Ask Walsin if you need both.
What temperature range does the TT series cover?
X7R parts are specified −55 to +125 °C and X5R parts −55 to +85 °C, both at ±15% capacitance change. Because 52 of the 57 rows are X5R, most of the series stops at 85 °C. For higher ambient temperatures the HT series is the Walsin line to look at instead.
Three ways to get this answered today
1. Cross a part, free. Paste up to 500 part numbers, or drop an Excel or CSV file, into the free cross-reference tool. It is matched against Walsin’s published catalogue and returns candidates field by field, with every difference from your original stated rather than hidden. Filter by commercial or automotive grade, or for soft termination, high temperature, safety certified, high Q / low ESR or low profile. There is no login and no charge.
2. Send the whole BOM. Upload a BOM and request a quote and we will come back line by line — including the lines we cannot help with, which is usually the more useful half of the answer.
3. Check the shelf before you commit. Ready stock shows what was physically in Hong Kong as at 23 September 2026. It is a dated snapshot, never a live feed, and quantities are never permanent.
Why take our word for any of this? Don’t — check it.
Venatech Limited (威納電子有限公司) is an authorised Walsin Technology distributor in Hong Kong. Confirm that with Walsin rather than with us. On the safety capacitor series we hold UL file E182369, which is searchable in UL’s own public database, together with TUV certificates R50381780 and R50195920 and CQC CQC20001280137 and CQC20001280136, against EN 60384-14:2023, IEC 60384-14:2023 and UL 60384-14. We hold 28 Walsin datasheets, 451 pages, and we will send the one covering your part number. Shipments arrive in original sealed Walsin packaging with lot and date-code traceability, and a certificate of conformity is available per shipment on request.
We will also tell you what we do not hold, which no competitor publishes. REACH, SVHC, conflict minerals, PFAS, China RoHS, ISO 9001, IATF 16949, PPAP, IMDS and a Declaration of Conformity appear nowhere in those 451 pages. You would rather hear that from us now than from your own supplier-approval team later. AEC-Q200 is compliant in Walsin’s own words and never certified, we hold no manufacturer’s end-of-life or allocation list for any brand, and qualification in your own circuit stays with you. We will not tell you a part is equivalent. We will show you where it differs.
Venatech Limited · Unit 207, 2/F, Sun Ling Plaza, 30 On Kui Street, Fanling, N.T., Hong Kong · (852) 2628 4777 · Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation.