Chip Resistor Tolerance and TCR for Netherlands Buyers: 58 of 154 Grid Cells Exist, and 169 Pairings Put the Looser TCR on the Tighter Tolerance

Chip resistor tolerance and TCR do not move together in Walsin Technology (Walsin)’s thick film export. We parsed 153,566 rows: only 58 of 154 tolerance-by-TCR cells hold a part, and in 169 sibling groups the tighter tolerance carries the looser TCR.

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If you are a Netherlands buyer filtering a BOM on tolerance and TCR together, you are filtering on two columns that the data treats as independent. Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 137 chip resistor export files. This post is written from the second half of that folder, files 69 to 137 in sort order, of which 35 return rows and 34 return nothing. Every part number below is real and every count is of part numbers, not pieces.

How many tolerance and TCR combinations does Walsin actually publish?

58 of 154. We counted every distinct Tolerance string and every distinct TCR string in the 35 populated files: 7 tolerances and 22 TCR strings, a grid of 154 cells. Only 58 cells hold a part and 96 are empty, which is 37.7 percent occupancy. Two tolerances, plus or minus 1 percent and plus or minus 5 percent, fill all 22 columns. The other five fill two or three each.

Tolerance	Rows	TCR strings present (of 22)	Series groups present (of 7)	Rows at 100 ppm/°C or better	Match / mismatch against a request for plus or minus 1 percent and 100 ppm/°C
±1%	115,324	22	6	79,654	Match on both fields for 79,654 rows; 35,670 rows mismatch on TCR
±5%	29,105	22	6	13,429	Mismatch on tolerance for every row
±0.5%	3,045	3	1	2,609	Mismatch on tolerance; tighter than asked, and 436 rows also mismatch on TCR
±2%	3,045	3	1	2,618	Mismatch on tolerance; looser than asked
0/-10%	676	2	1	0	Mismatch — asymmetric trim band, no row at 100 ppm/°C
0/-20%	1,129	3	1	0	Mismatch — asymmetric trim band
0/-30%	1,135	3	1	0	Mismatch — asymmetric trim band

The 107 jumper rows are excluded from the grid: their Tolerance reads Jumper and their TCR reads a dash on 106 of 107, which is a part type, not a pairing. We have covered the jumper rows separately in the 000 code post.

In this half of the folder, the three tolerances that are not plus or minus 1 or 5 percent each live in exactly one series group. Plus or minus 0.5 and plus or minus 2 percent live only in the high voltage group; the asymmetric bands live only in the trimmable group. A BOM that asks for 0.5 percent therefore asks, whether it knows it or not, for a high voltage part.

Does tolerance decide TCR in Walsin’s thick film export?

Mostly not, and the datasheet agrees. We opened Walsin_WR_General_Purpose_Chip_Resistor.pdf and read its quick reference table: one TCR row per resistance band, spanning both the 1 percent and the 5 percent column. Above 10 ohms the table says 100 ppm/°C; at 10 ohms and below it says minus 200 to plus 400.

We then checked that rule against the export. We took the plain WR general purpose series at 0402, 0603, 0805 and 1206, excluding the 280 rows whose fifth character is F, which are a separate 1/2 W variant at 1206. That leaves 3,872 rows. All 3,872 follow the datasheet’s resistance rule: 3,872 of 3,872 match. 3,196 of them are plus or minus 1 percent and 676 are plus or minus 5 percent, and the tolerance changes nothing.

WR04X1002FTL, WR08X1002FTL and WR12X1002FTL are all 10 kilohm, plus or minus 1 percent, at 100 ppm/°C or better. Change the tolerance letter and the TCR does not move.

Where does a tighter tolerance carry a looser TCR?

In 169 sibling groups, all in two series groups. We defined a sibling group as rows sharing series name, two-letter prefix, case size, resistance and rated power. 22,899 sibling groups are offered at two or more symmetric tolerances. In 3,671 of them (16.0 percent) the TCR changes when the tolerance changes. In 169 of those, the tighter tolerance has the looser TCR. We have not seen this counted anywhere.

The 169 split into 120 in Thick Film General Purpose and 49 in Thick Film Low Ohm Current Sense. Every one of the 120 general purpose groups is a WR part between 1.1 and 10 megohm, at 1218 and 1 W (24 groups), 2010 and 1/2 W (48) or 2512 and 1 W (48). In each, the plus or minus 1 percent part states 200 ppm/°C and its plus or minus 5 percent sibling states 100 ppm/°C.

Part number	Case size, rated power	Resistance	Tolerance	TCR	Match / mismatch against its plus or minus 5 percent sibling
WR20W1005FTLJ	2010, 1/2 W	10 MΩ	±1%	≦±200	Mismatch — tighter tolerance, looser TCR; fifth character W against X
WR20X106 JTLJ	2010, 1/2 W	10 MΩ	±5%	≦±100	reference
WR25W1104FTR	2512, 1 W	1.1 MΩ	±1%	≦±200	Mismatch — same direction at a different case size
WR25X115 JTR	2512, 1 W	1.1 MΩ	±5%	≦±100	reference
WW08WR022FTL	0805, 1/4 W	0.022 Ω	±1%	≦±600	Mismatch — current sense, 200 ppm/°C looser than the sibling
WW08WR022JTL	0805, 1/4 W	0.022 Ω	±5%	≦±400	reference

We checked the direction in the other groups. In Thick Film High Power, 1,842 sibling groups change TCR with tolerance and none runs the wrong way: the looser tolerance always carries the looser TCR. In High Voltage, 951 change and none contradicts. So the 169 are not noise in a general trend. They are two specific shelves where the data disagrees with a common-sense pairing.

Why do the high voltage 0.5 percent and 2 percent shelves never meet an automotive filter?

Because they sit in different series. We counted 3,045 rows at plus or minus 0.5 percent and 3,045 at plus or minus 2 percent in the high voltage group, and they are mirror images: all 3,045 of the 0.5 percent rows are in the plain series, and all 3,045 of the 2 percent rows are in the series whose name carries the word Automotive. Zero rows combine 0.5 percent with an Automotive series name.

Each shelf holds exactly 609 rows at each of five case sizes, 0603 to 2512. The J suffix agrees with the series name: all 3,045 of the 2 percent part numbers end in J and none of the 0.5 percent ones do.

Part number	Case size, rated power	Resistance	Tolerance	TCR	Match / mismatch against WK25V47R0FTL
WK25V47R0DTL	2512, 1 W	47 Ω	±0.5%	-200～+500	Match on size, value, TCR and power; mismatch on tolerance; plain series
WK25V47R0FTL	2512, 1 W	47 Ω	±1%	-200～+500	reference
WK25V47R0GTLJ	2512, 1 W	47 Ω	±2%	-200～+500	Match on size, value, TCR and power; mismatch on tolerance and series name
WK25V470 JTL	2512, 1 W	47 Ω	±5%	-200～+500	Match on size, value, TCR and power; mismatch on tolerance; embedded space in the part number

Look at the TCR column. All four carry minus 200 to plus 500 ppm/°C. That window appears on 168 high voltage rows, only at 2512, only between 47 and 97.6 ohms, and on all four tolerances. It is set by resistance and case size, not by tolerance. A plus or minus 0.5 percent part with a 700 ppm/°C-wide window is on the shelf: 38 such rows.

How does Walsin write TCR, and what does a numeric filter do to it?

In three notations, and a numeric filter reads only one. We parsed all 153,459 non-jumper rows: 143,423 write TCR as ≦± followed by a number, 9,492 write a range with a full-width tilde such as -200～+400, and 544 write a range with a spaced ASCII tilde such as 0 ~ 600. That is 12, 6 and 4 distinct strings.

A string filter written for ≦±100 returns the 98,310 rows that carry it and silently drops the 10,036 rows that state a range instead. The range rows are not looser by definition; 0 ~ 200 is a narrower window than ≦±200. They are simply invisible to a string match, and to any cast to a number.

For the tolerance column’s own notation problem, see our count of the three ways Walsin writes plus or minus. For what the letters in a part number say about tolerance and TCR, see tolerance, TCR and dielectric codes decoded.

What should a Netherlands BOM filter check before it trusts a tolerance and TCR pair?

Four things, each measured above. First, test whether your pair exists: only 58 of 154 cells do. Second, treat tolerance and TCR as independent fields and state both. Third, parse all three TCR notations. Fourth, when a cross result offers a plus or minus 1 percent part for a plus or minus 5 percent original, read the TCR it states, because in 169 sibling groups it is the looser one.

Our free cross-reference tool states each field of a Walsin candidate against your original, with the differences listed and not hidden behind a tick. We will not tell you a part matches. We will show you where it differs. We hold 28 Walsin datasheets, 451 pages, and ask for the one covering your part number and it will be in your inbox. For the thick film groups here, only the MR automotive and WR general purpose sheets exist; we hold none for high voltage, high power, current sense, trimmable or wide terminal.

What is in Hong Kong is on ready stock: 1,125 part numbers as at 23 September 2026, a dated snapshot and not a live feed. The resistor range sits on the chip resistor page. Confirm against both datasheets and qualify in your own circuit.

The short version

Walsin publishes 58 of 154 possible tolerance-by-TCR cells in the second half of its chip resistor folder. Plus or minus 0.5 and 2 percent each live in one high voltage shelf of 3,045 rows, one plain and one Automotive-named. In 3,872 of 3,872 plain WR rows at 0402 to 1206, TCR follows the datasheet’s resistance rule and ignores tolerance. In 169 sibling groups, 120 general purpose and 49 current sense, the plus or minus 1 percent part states a looser TCR than its plus or minus 5 percent sibling. Qualification stays with you.

Send us the tolerance and TCR lines off your BOM and we will tell you which cell each falls in and what the nearest Walsin neighbour does differently. And a question back: when your selector returned a tighter-tolerance part, did anyone read its TCR?

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Frequently asked questions

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