Large Case MLCC: Walsin’s Big Sizes Shelf Buys Up to 17x the Capacitance of 1206, for 5.6x the Board Area

We measured all 501 rows of Walsin’s Big Sizes shelf against every 1206 row at matched voltage. At 2,000 Vdc it buys 17x the capacitance for 5.6x to 7x the board area, and at 3,000 Vdc 1206 is not on the shelf at all. Large case MLCC selection is a board-area trade.

Venatech Limited, an authorised Walsin distributor in Hong Kong, measured this from Walsin Technology (Walsin)’s own 05_Big_Sizes_1825_2220_2225.xlsx (501 rows) and the 00_ALL_MLCC_parts_combined.xlsx full export (24,026 rows), cross-checked at matched rated voltage against every 1206 row in the catalogue. Every part number below is real and every figure is a count of part numbers, not pieces.

What is actually inside Walsin’s 501-row Big Sizes shelf?

Three case codes, two dielectrics, and a voltage range wider than any other Walsin MLCC series. We parsed all 501 rows: 1825 holds 118 (57 NP0, 61 X7R), 2220 holds 258 (63 NP0, 195 X7R), and 2225 holds 125 (41 NP0, 84 X7R) — 161 NP0 and 340 X7R across the shelf. We have already published the per-case capacitance ceilings for this series — 4.7 µF at 1825, 47 µF at 2220, 10 µF at 2225 — so we are not re-deriving them here. What we have not measured before is what this shelf costs against the case size most designs reach for first.

How much board area does a large case MLCC cost against 1206?

Between 5.6 and 7 times the footprint, for a case family that holds 14.2% as many rows as 1206 alone. We computed nominal length times width for all four case codes from the L and W fields: 1206 is 5.12 mm², and the three Big Sizes codes run 28.50 to 35.91 mm². 2220 is actually the narrowest of the three by area despite not being the smallest-looking code — 5.0 mm width against 1825’s 6.3 mm and 2225’s 6.3 mm, at the same 5.7 mm length as 2225. We have not seen this area ratio stated anywhere; most comparisons stop at the case code and never convert it to a board-area number a layout engineer can actually budget against.

How much capacitance does that board area actually buy at a matched voltage?

It depends entirely on which voltage rung you need, and the multiple is not constant. We filtered both the 1206 rows and the Big Sizes rows to the same rated voltage and compared the highest capacitance available at each, across six rungs from 50 Vdc to 4,000 Vdc.

The advantage is not a flat multiplier. At 50 Vdc the board-area cost barely pays for itself (2.2x capacitance for 5.6x area); at 500 and 2,000 Vdc the same board-area cost returns 17x to 18x the capacitance. The voltage rung decides whether Big Sizes is worth the footprint, not a general rule about case size.

Where does 1206 run out entirely, and Big Sizes keep going?

At 2,500 Vdc. We checked every rated-voltage value present in the 1206 size across the whole export: 4, 6.3, 10, 16, 25, 35, 50, 100, 200, 250, 400, 450, 500, 630, 1,000, 1,500, 2,000 and 2,500 Vdc — eighteen rungs, and nothing above 2,500 Vdc. Big Sizes continues to 3,000 Vdc (71 rows) and 4,000 Vdc (37 rows), still carrying 18 nF and 1.8 nF ceilings respectively.

So the honest statement is not “Big Sizes gives you more capacitance in every case” — it is that above 2,500 Vdc, 1206 is not a candidate at all, at any capacitance, and the decision Big Sizes vs 1206 collapses to Big Sizes vs nothing.

We will not tell you either part satisfies a requirement it does not meet. At 3,000 Vdc there is one answer in this catalogue, and it is not in 1206.

What does the extra board area cost in thickness and flex risk?

Up to 1.94 mm more height, and a mechanism that is well understood but not quantified for this series. We read the T field across all 501 Big Sizes rows: thickness runs from 1.60 mm to a published maximum of 3.10 mm on 2220 (2225 and 1825 top out at 2.80 mm), against a 1206 thickness we measured at a nominal 1.60 mm on general-purpose rows and as low as 0.80 mm on thinner-profile parts. A larger, thicker, stiffer ceramic body transmits more board-flex stress into the solder joint, which is the general mechanism behind flex cracking in multilayer ceramics — Walsin’s own handling notes describe chip capacitors generically as dense, hard, brittle and abrasive, without publishing a case-size-specific bend figure for 1825, 2220 or 2225.

What should a designer actually pick between 1206 and Big Sizes?

Match the case to whichever constraint is actually binding, because the board-area cost of Big Sizes pays for itself unevenly across the voltage range we measured.

1. Below 500 Vdc with capacitance headroom to spare, the area cost rarely pays for itself — 2.2x capacitance for 5.6x area at 50 Vdc. Stay on 1206 unless another constraint forces the move.
2. At 500 to 2,000 Vdc, Big Sizes returns 10x to 18x the capacitance for the same 5.6x to 7x area — this is where the trade is worth making.
3. Above 2,500 Vdc, there is no 1206 decision to make. Big Sizes, or a different series entirely, is the only shelf.
4. Budget the thickness, not just the footprint. 2220’s 3.10 mm ceiling is nearly double a 1.60 mm 1206, and that is a z-height line item under a busbar or cold plate, not a cosmetic difference.
5. Cross the whole BOM in one pass. Paste up to 500 part numbers or drop your Excel or CSV into the free cross-reference tool. It decodes 18 manufacturers’ part numbers and matches against 800,000+ crossable Walsin part numbers, with every difference from your original stated rather than hidden.
6. Check what is physically in Hong Kong on ready stock before committing a build slot — a dated snapshot as at 23 September 2026, not a live feed.

For the per-case capacitance ceilings inside this series, see Big Size MLCC explained: 1825, 2220 and 2225 compared. For the voltage-versus-case-size cost on a high-voltage bus, see EV traction inverter passives for Germany. The full range is on the Walsin MLCC range page, and the Big Sizes datasheet itself is in our 451 pages, sent on request.

Check us while you are here. UL file E182369 is searchable in UL’s own public database in about thirty seconds, and TUV certificates R50381780 and R50195920 are named and numbered for the same reason — verifiable facts, not adjectives.

The short version

We measured Walsin’s 501-row Big Sizes shelf against every 1206 row at six matched voltages. The board-area cost is fixed — 5.57x at 2220, 5.66x at 1825, 7.01x at 2225 — but the capacitance return is not: 2.2x at 50 Vdc, 17.9x at 500 Vdc, 10x at 1,000 Vdc, 17x at 2,000 Vdc, and at 3,000 Vdc 1206 does not exist on this catalogue at all. Thickness runs up to 3.10 mm against a 1.60 mm 1206, and Walsin publishes no case-specific flex rating for any of the three codes.

Send us your capacitance and voltage requirement and we will tell you whether 1206 still covers it or whether you are already paying the Big Sizes board-area cost without the return — with the part number and the datasheet page behind it.

Frequently asked questions