Walsin Chip Resistor Series Group: 14 Groups, 58 Series, and Zero Extra Information

The Walsin chip resistor Series Group column discriminates nothing. We parsed all 234,815 rows across 137 export files and found 14 group values and 58 series values. Not one series appears under two groups. The group is a pure function of the series, so it adds no information a series filter did not already give you.

Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 137 chip resistor export files published by Walsin Technology (Walsin) and both chip resistor datasheets, Walsin_WR_General_Purpose_Chip_Resistor.pdf and Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf. Series Group exists on this product line and on no other line in the catalogue, which is why nobody has audited it. We grouped every row ourselves. Every part number below is real and every count is a count of part numbers, not pieces.

How many Series Groups and Series does Walsin’s chip resistor export actually hold?

Fourteen and fifty-eight. We concatenated the 64 files in Walsin_ChipR_Product_Data that return rows — 73 of the 137 return none — and counted the distinct values in both columns across all 234,815 rows. Neither column has a single blank cell. The largest group, Thick Film General Purpose, holds 75,628 rows across 6 series. The smallest, Chip Attenuator (Convex, Π type), holds 23 rows across 1.

Fifty-eight series, fourteen groups, and on 41 of the 58 group-and-series pairs the group string appears verbatim inside the series string. Thick Film Trimmable Chip Resistor is both the group and the series on all 2,940 rows. We have not seen this counted anywhere.

Does any series ever sit under two different series groups?

No — zero of 58. We built the series-to-group map row by row across all 234,815 rows and every series resolves to exactly one group with no exceptions. That is the finding, and it is not a compliment to the column. A hierarchy in which the child determines the parent with certainty carries no information the child did not already carry. Knowing a part’s series tells you its group; knowing its group narrows you to between 1 and 14 series.

Compare that with the file dimension, where the same specification genuinely does scatter. A selector that offers Series Group as a first filter and Series as a second is offering one filter twice. For the file-level version of the same problem see Walsin chip resistor file coverage.

What does one 0603, 10 kilohm, 1 percent, 1/10 W shelf look like across the groups?

Twenty-one part numbers, in 5 of the 14 groups and 16 of the 58 series. We filtered all 234,815 rows on Size 0603(1608), Resistance 10000Ω, Tolerance ±1% and Rated Power 1/10W. Nothing about the four fields a buyer actually specifies confines the answer to one group. Six of the twenty-one are below.

Read the fifth row again. WA06X1002FTL matches the reference part on case size, resistance, tolerance, rated power and TCR, and it is a four-resistor network in an 0603 body. Nothing in the Size column says so; the group name is the only warning, and a buyer who filtered on the four electrical fields never saw it.

Across the whole line this is systematic. 17,508 of the 64,786 distinct size-resistance-tolerance-power signatures in the export appear under more than one series group, and 600 of them appear under five. We counted every signature ourselves.

Which series groups hold exactly one series?

Four, covering 3,549 rows. Thick Film Trimmable Chip Resistor (2,940 rows), Thick Film High Ohm Chip-Resistor (>10MΩ) (488), Thick Film Chip Resistor Network, Convex Type (98) and Chip Attenuator (Convex, Π type) (23) each carry one series whose name is the group name. On those 3,549 rows the two columns are duplicates of one another, character for character in three of the four cases.

All 488 high-ohm rows sit in one file, Thick_Film_High_Ohm_Chip_Resistor_10M__1of1.xlsx, and that row is the one to watch if you join on the text. The group value carries a trailing space and the series value does not, so a naive equality test on those two columns returns false on all 488 rows while a human reads them as the same string.

What is wrong with the series strings themselves?

Three faults, on 6,997 of 234,815 rows between them. We normalised all 58 series names for case and whitespace and watched 58 collapse to 55. Three pairs of series differ only by a capital letter. Thick Film Chip Resistor Array 0603*4, Convex type and ...Convex Type are two separate strings in the export, 741 rows and 717 rows; the same split occurs at 04024 (706 and 693) and at 06028 (555 and 555), 3,967 rows in total. Ten of the 58 series names also carry a double space after the word “Array”.

The third fault is a spelling error, and we read it in Thick_Film_Anti_Surge_Chip_Resistor_0_5.xlsx before believing it. Thick Flim Power Surge Chip Resistor (Automotive) carries 3,030 rows — “Film” written as “Flim” — and it sits in the Thick Film Anti-Surge Chip Resistor group alongside two correctly spelled siblings. MK06S1R00DTL is one of those 3,030: 0603 (1608), 1.00 Ω, ±0.5%, ≦±200 ppm/°C, 1/4 W. Any tool that filters series names on the substring “Thick Film” drops all 3,030 silently. This is the same class of defect as the double-spaced filter type on Walsin’s RF export, which we published earlier, and it is why we do not build string filters on this data without normalising first.

Does the group name tell you whether a part is automotive or sulfur-resistant?

Never for automotive, never for sulfur. 102,995 of 234,815 rows sit in a series whose name contains “(Automotive)” — 17 of the 58 series — and 9 of the 14 groups contain both automotive and commercial rows. Thick Film General Purpose alone holds 50,891 automotive rows and 24,737 commercial ones. The word “Automotive” appears in no group value in the export.

Sulfur resistance behaves the same way. 41,147 rows sit in a series naming anti-sulfuration, and they are scattered across four groups — General Purpose, High Power, High Precision and the one group that does name it. The 12,871-part SR anti-sulfuration automotive series is filed under Thick Film General Purpose. A buyer selecting for a sulfur-bearing environment by group name finds 2,772 array parts and misses 38,375 others.

What should you filter on instead?

The four fields you actually specify, then the series string, then the datasheet. Size, Resistance, Tolerance and Rated Power narrow 234,815 rows to a handful; in the worked example above they narrowed it to 21. The series string is where grade, sulfur resistance, voltage construction and array geometry are hidden, so read it as text rather than treating it as a category. The group is decorative.

1. Cross the whole list 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. It decodes 18 manufacturers’ part numbers against 800,000+ crossable Walsin part numbers.
2. Check what is physically in Hong Kong on ready stock — 1,125 part numbers as at 23 September 2026, a dated snapshot and not a live feed.
3. Ask us for the governing sheet. We hold 28 Walsin datasheets, 451 pages, and only two of them are chip resistor documents. Eleven of the thirteen chip resistor part-number prefixes have no sheet at all.

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. The full line sits on the Walsin chip resistor page, and the automotive split is set out in Walsin automotive chip resistors.

The short version

Walsin’s chip resistor export carries a Series Group column that no other product line has, and we measured what it buys you: nothing. Fourteen group values, 58 series values, zero series appearing under two groups, and the group string sitting verbatim inside the series string on 41 of 58 pairs. Four groups hold one series each and simply repeat it on 3,549 rows. 17,508 of 64,786 distinct specification signatures cross a group boundary, so the group does not partition the shelf either. The strings themselves carry three case-only duplicate pairs, ten double spaces and one misspelling across 3,030 rows. Grade and sulfur resistance live in free text and in no column at all. We will not tell you a part is equivalent to yours. We will show you where it differs, field by field, and we will tell you when a field is not doing its job. Qualification stays with you.

Send us the chip resistor lines off your bill of materials and we will return each one with its real series string, its group, and the fields where a same-spec candidate differs. And a question back: how many of your parametric searches this year narrowed on a column that could not narrow anything?

Frequently asked questions