Wide Terminal Power Resistor Power Density: Zero of 3 Equal-Area Pairs Beat the Standard Footprint, Measured for the Netherlands

Wide terminal power resistor power density never beats the standard footprint in Walsin’s catalogue. We measured board area from the metric code on all 4,294 wide terminal rows. Three wide terminal footprints pair exactly on area with 1206, 2010 and 2512. On zero of the three pairs does wide terminal carry more watts.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, read Thick_Film_Wide_Terminal_Power_Chip_Resistor__1of1.xlsx from Walsin Technology (Walsin) — 4,294 rows — against the other 136 chip resistor export files, 230,521 rows between them. Board area below is computed from the metric pair in each row’s own Size string, not estimated. Every part number is real.

Which standard footprint occupies exactly the same board area as a wide terminal part?

All three of them. We read the metric pair out of the Size column on every wide terminal row — 1225(3264), 0612(1632) and 1020(2550) — and each one is the transpose of a standard footprint already in the catalogue. The land area is identical to the square millimetre; only the orientation changes.

Wide terminal size	Metric pair	Board area	Standard size at the same area	Metric pair	Rows, wide terminal / standard
0612	1632 — 1.6 mm by 3.2 mm	5.12 mm²	1206	3216 — 3.2 mm by 1.6 mm	1,708 / 37,566
1020	2550 — 2.5 mm by 5.0 mm	12.50 mm²	2010	5025 — 5.0 mm by 2.5 mm	878 / 21,228
1225	3264 — 3.2 mm by 6.4 mm	20.48 mm²	2512	6432 — 6.4 mm by 3.2 mm	1,708 / 22,154

A wide terminal part is the same rectangle rotated 90 degrees. The current path shortens and the terminal width grows. Nothing about the area a layout engineer has to find changes at all, which is precisely why power density is the honest way to compare them.

Does a wide terminal resistor carry more watts per square millimetre?

On none of the three pairs. We took the maximum rated power present at each case size across all 234,815 chip resistor rows and divided by the board area from the metric code. 0612 ties 1206 exactly. 1020 and 1225 both lose to their equal-area standard partner by the same 50%.

Board area	Wide terminal size	Max rated power	W/mm²	Standard size	Max rated power	W/mm²	Which carries more
5.12 mm²	0612	1 W	0.1953	1206	1 W	0.1953	Tie
12.50 mm²	1020	1 W	0.0800	2010	1.5 W	0.1200	Standard, by 50%
20.48 mm²	1225	2 W	0.0977	2512	3 W	0.1465	Standard, by 50%

We have not seen this counted anywhere. Wide terminal is sold as a power geometry and in Walsin’s published data it is not a power-density geometry. Whatever the reason for choosing it, more watts in the same board area is not it on two of the three footprints, and is a dead heat on the third.

Which wide terminal footprint has the lowest power density in the catalogue?

1020, at 0.0800 W/mm². We ranked all 16 case sizes whose Size string carries a metric pair we could resolve, using the highest rated power present at each, and 1020 comes 14th of 16 — below 0201, which manages 0.1042 W/mm² on a footprint one-thirteenth the area.

Rank	Case size	Board area	Max rated power	W/mm²
1	0306 (0816)	1.28 mm²	1/2 W	0.3906
2=	0612 (1632)	5.12 mm²	1 W	0.1953
2=	1206 (3216)	5.12 mm²	1 W	0.1953
6	2512 (6432)	20.48 mm²	3 W	0.1465
8	2010 (5025)	12.50 mm²	1.5 W	0.1200
10	0201 (0603)	0.96 mm²	1/10 W	0.1042
12	1225 (3264)	20.48 mm²	2 W	0.0977
14	1020 (2550)	12.50 mm²	1 W	0.0800
16	1218 (3248)	15.36 mm²	1 W	0.0651

The single densest case size in the whole chip resistor catalogue is 0306, and we counted exactly 10 rows carrying it — all in the metal foil low-ohm sensing series. The two wide terminal sizes a buyer reaches for when they want power, 1020 and 1225, sit in the bottom third.

Are there resistance and wattage cells only a wide terminal part can fill?

Yes, 870 of them, and they are all in one place. We built every (resistance, tolerance, rated power) cell at each wide terminal size and tested it against the equal-area standard footprint. 870 of 3,464 wide terminal cells have no equal-area standard part — and all 870 sit at 0612 and 1 W.

Board area	Wide terminal cells	Also available at the equal-area standard size	Wide-terminal-only
5.12 mm² — 0612 against 1206	1,708	838	870, every one at 1 W
12.50 mm² — 1020 against 2010	878	878	0
20.48 mm² — 1225 against 2512	878	878	0

The reason is a resistance-range cut-off rather than a thermal limit. We counted all 269 rows at 1206 that reach 1 W: every one of them is a metal low-ohm sensing part between 0.001 Ω and 0.62 Ω, so above 0.62 Ω the 1206 footprint does not reach 1 W anywhere in the catalogue. The 0612 wide terminal 1 W line runs from 0.1 Ω to 1 MΩ across 878 resistance and tolerance cells, and only 8 of those 878 overlap with 1206 at 1 W.

So the one place wide terminal is genuinely the only option at equal board area is the smallest wide terminal footprint, not the largest. At 12.50 mm² and 20.48 mm², every single resistance, tolerance and wattage cell the wide terminal part offers is also available on the standard footprint.

Where does the same 10 kilohm position sit across wide terminal and standard?

Five real wide terminal part numbers at 10 kΩ ±1%, against the standard part at the identical board area. We pulled every row below from Walsin’s own export rather than a selector page.

Walsin part number	Case code	Board area	Rated power	TCR	W/mm²	Match / mismatch vs the equal-area standard part
WK12L1002FTL	0612	5.12 mm²	3/4 W	≦±200	0.1465	Against MF12E1002FTL — 1206, 5.12 mm², 3/4 W, ≦±100. Match on resistance, tolerance, board area and rated power. Mismatch on case code and TCR
WF12L1002FTLJ	0612	5.12 mm²	1 W	≦±100	0.1953	Mismatch — no 1206 part at 10 kΩ reaches 1 W. This is the only cell in the three pairs where wide terminal is the sole option
WK20L1002FTL	1020	12.50 mm²	1 W	≦±200	0.0800	Against MF20E1002FTL — 2010, 12.50 mm², 1 W, ≦±100. Match on resistance, tolerance, board area and rated power. Mismatch on case code and TCR, and 2010 also offers 1.5 W at this value while 1020 does not
WK25L1002FTL	1225	20.48 mm²	2 W	≦±200	0.0977	Against MF25E1002FTL — 2512, 20.48 mm², 2 W, ≦±100. Match on resistance, tolerance, board area and rated power. Mismatch on case code and TCR
WF25L1002FTLJ	1225	20.48 mm²	2 W	≦±100	0.0977	Against WF25A1002FZL — 2512, 20.48 mm², 3 W, ≦±100. Match on resistance, tolerance, board area and TCR. Mismatch on rated power — 3 W against 2 W on identical area
Your incumbent wide terminal part	—	—	—	—	—	Fill this column from your own datasheet, then confirm against both sheets and qualify in your own circuit

Every wide terminal row above that matches on wattage mismatches on TCR, because the wide terminal file is built on ≦±200 ppm/°C — 2,674 of its 4,294 rows — while the equal-area standard parts at these values are ≦±100 ppm/°C. We will not tell you these parts are interchangeable. We will show you which field moves.

Does the export spell 1225 two different ways?

Yes, on two incompatible metric pairs. We counted every distinct Size string across all 234,815 chip resistor rows: 1,708 rows read 1225(3264) and 47 read 1225(3263). The 1,708 are the wide terminal file; the 47 are in the metal low-ohm sensing file.

3.2 mm by 6.4 mm is 20.48 mm². 3.2 mm by 6.3 mm is 20.16 mm². That is a 1.6% difference in stated board area on the same imperial case code, and a filter keyed on the exact Size string will split one footprint into two. WW25YR001FTL at 0.001 Ω is a real 1225(3263) part; WK25L1R00FTL at 1.00 Ω is a real 1225(3264) part.

One more string worth knowing about: the TCR value 0 ~ 200 appears on 82 rows and all 82 are wide terminal. We searched all 234,815 rows and it exists nowhere else, alongside 0 ~ 250 on 20 wide terminal rows and 0 ~ 350 on 42. A numeric TCR filter will drop all 144 of them.

So where does wide terminal actually win, and what should a Netherlands buyer do?

Not on watts per square millimetre, on any pair we measured. The case for wide terminal rests on the terminal geometry itself — the current path is 1.6 mm instead of 3.2 mm at 0612, and the solder joint is twice as wide — and no column in any of the 137 export files records a mechanical or thermal property at all. That is the honest finding, and it is why we are not going to tell you wide terminal is a power upgrade.

1. Decide on board area, not on case code. 0612 and 1206 are the same 5.12 mm². If your layout has room for one, it has room for the other.
2. Check the TCR before the wattage. 2,674 of 4,294 wide terminal rows are ≦±200 ppm/°C, and the equal-area standard part is usually ≦±100 ppm/°C.
3. Cross the whole bill of materials 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.
4. Check what is physically in Hong Kong on ready stock before you commit a build slot — a dated snapshot as at 23 September 2026, not a live feed, and chip resistor stock representation is 0.11% of the catalogue.

For the footprint inventory and the part-number key, see wide terminal 1225, 1020 and 0612, and for how wattage tracks case size across the whole line, chip resistor power rating by case size. The range is on the Walsin chip resistor page.

The short version

Wide terminal power resistor power density does not beat the standard footprint anywhere in Walsin’s published data. All three wide terminal footprints are exact transposes of standard ones: 0612 and 1206 at 5.12 mm², 1020 and 2010 at 12.50 mm², 1225 and 2512 at 20.48 mm². At equal area, 0612 ties 1206 at 0.1953 W/mm², 1020 reaches 0.0800 against 2010’s 0.1200, and 1225 reaches 0.0977 against 2512’s 0.1465 — zero of three pairs favour wide terminal. 1020 ranks 14th of the 16 case sizes we could rank. The one cell where wide terminal is the sole option is 1 W at 5.12 mm², on 870 of 878 resistance and tolerance combinations, because 1206 reaches 1 W only on 269 low-ohm sensing rows below 0.62 Ω. 1225 is written with two different metric pairs. No export column records a mechanical or thermal property, and we hold no datasheet for the family. Qualification stays with you.

Send us the wide terminal positions off your Netherlands bill of materials and we will give you the equal-area standard part, the W/mm² on both, every field that differs, and what was physically in Hong Kong on 23 September 2026. If you specified wide terminal for the power rating rather than the solder joint, which number were you working from?

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Frequently asked questions

<!– wp:rank-math/faq-block {"questions":[{"id":"faq-question-01","title":"Does a wide terminal chip resistor give more power in the same board area?","content":"Not in Walsin's catalogue. We measured board area from the metric pair on all 4,294 wide terminal rows. 0612 ties 1206 at 0.1953 W/mm², 1020 reaches 0.0800 against 2010's 0.1200, and 1225 reaches 0.0977 against 2512's 0.1465. Zero of the three equal-area pairs favour wide terminal.","visible":true},{"id":"faq-question-02","title":"Which standard case size has the same board area as 0612, 1020 and 1225?","content":"1206, 2010 and 2512 respectively. Each wide terminal footprint is the transpose of a standard one — 1632 against 3216, 2550 against 5025, 3264 against 6432 — so the areas are identical at 5.12, 12.50 and 20.48 square millimetres. Only the orientation of the current path changes.","visible":true},{"id":"faq-question-03","title":"Is there anything only a wide terminal resistor can do at the same board area?","content":"One cell. We tested every resistance, tolerance and wattage combination at each wide terminal size against its equal-area standard partner: 870 of 3,464 have no standard counterpart, and all 870 are at 0612 and 1 W. At 12.50 and 20.48 square millimetres, zero are wide-terminal-only.","visible":true},{"id":"faq-question-04","title":"Why can a 0612 reach 1 W at 10 kilohm when a 1206 cannot?","content":"Because the 1206 footprint reaches 1 W only on low-ohm sensing parts. We counted all 269 rows at 1206 rated 1 W and every one sits between 0.001 Ω and 0.62 Ω in the metal low-ohm sensing series. The 0612 wide terminal 1 W line runs from 0.1 Ω to 1 MΩ.","visible":true},{"id":"faq-question-05","title":"What TCR do Walsin's wide terminal power resistors publish?","content":"Mostly ≦±200 ppm/°C — 2,674 of 4,294 rows — with 1,476 at ≦±100 ppm/°C. A further 144 rows state TCR as a one-sided range, and 0 ~ 200 on 82 of them appears nowhere else in the 234,815-row chip resistor catalogue. A numeric filter will drop all 144.”,”visible”:true},{“id”:”faq-question-06″,”title”:”Does Walsin’s export use two different metric codes for 1225?”,”content”:”Yes. We counted every distinct size string across all 234,815 rows: 1,708 read 1225(3264), which is 20.48 square millimetres, and 47 read 1225(3263), which is 20.16. The 1,708 are wide terminal rows and the 47 are metal low-ohm sensing rows, so a string filter splits one case code in two.”,”visible”:true},{“id”:”faq-question-07″,”title”:”Does Venatech hold a datasheet for the Walsin wide terminal power resistor family?”,”content”:”No. We hold 28 Walsin datasheets, 451 pages, and only two cover chip resistors — the MR automotive sheet and the WR general purpose sheet at revision ASC_WR_V24, SEP 2016. Neither covers the wide terminal family. We hold no public URL for either file and both are on our request list.”,”visible”:true}],”listStyle”:””,”titleWrapper”:”h3″,”titleCssClasses”:””,”contentCssClasses”:””,”sizeSlug”:””} –>

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