Walsin’s General Purpose Chip Resistor Range: Inside the 75,628-Part Line

Walsin’s Thick Film General Purpose chip resistor range is 75,628 part numbers — the single
largest group in Walsin Technology (Walsin)’s entire chip resistor catalogue. It spans three
prefixes (WR 45,315, MR 17,442, SR 12,871), ten case sizes from 01005 to 2512, and two resistance
series: 34.9% of the non-jumper parts sit on E24 values, 65.1% on E96. No other chip resistor
series group in the extract comes close to this size.

Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 137 of Walsin’s chip
resistor export files, which share one ten-column schema across 234,815 rows. This post is
written from the 75,628 rows tagged Thick Film General Purpose. Every part number below is real
and counts are of part numbers, not pieces.

What is in Walsin’s general purpose chip resistor range?

Six named series under one series group. Three are commercial, three are automotive, and they
sit behind three part-number prefixes:

Venatech has already published the full automotive breakdown, including why WR cannot be
filtered on its prefix alone, in
Walsin automotive chip resistors: MR, SR and the AEC-Q200 split.
This post does not repeat that story. It covers the two things that post does not: the case-size
spread and the E24/E96 split, both measured across the full 75,628-part group.

How many case sizes does the general purpose range cover, and at what power?

Ten, from 01005 up to 2512, at eleven distinct rated powers from 1/32 W to 2 W:

Most sizes publish one dominant rated power that matches the WR or MR datasheet for that size.
Three sizes — 1206, 2010 and 2512 — carry a second, higher-rated sub-line discussed below.

Is a Walsin general purpose chip resistor E24 or E96?

Both, and E96 is the larger share. Of the 75,554 non-jumper general purpose parts, 26,384
(34.9%) sit on E24 values and 49,170 (65.1%) sit on E96-only values — the 72 additional
mantissas per decade that E24 does not carry. The ratio holds across every case size in the
group; there is no size where the range is E24-only.

A single decade shows the pattern directly. WR06X1002FTL (10 kΩ), WR06X1022FTL (10.2 kΩ),
WR06X1052FTL (10.5 kΩ), WR06X1072FTL (10.7 kΩ) and WR06X1102FTL (11 kΩ) are five real
0603, ±1%, 1/10 W general purpose part numbers in strict numerical order. Two of the five — the
10 kΩ and 11 kΩ ends — are E24 values. The three in between exist only because Walsin also
stocks E96:

For how Walsin’s own datasheets print the E96 decode table, see
E24 vs E96: which Walsin series give you which.

Why do some 1206, 2010 and 2512 parts carry a higher rated power than the rest of the line?

Because of a narrow sub-line, 140 parts per case size, restricted to resistance values from
1.0 Ω to 10.0 Ω, carrying a two-letter suffix after a space in the part number. We have not seen
this suffix documented in either resistor datasheet we hold, and it is restricted to one
commercial series: Thick Film General Purpose Chip Resistor.

That is 420 part numbers total — 140 each carrying FN, HN or JN — all at 1.0–10.0 Ω, all
one rated-power step above the ordinary figure for that case size, and all with a stem that
matches a real, ordinarily-rated part number one space character away. WR12F1R00FTL (1/4 W)
and WR12F1R00FTL FN (1/2 W) are the same resistance, the same ±1% tolerance and the same
≦±100 ppm/°C TCR.

Which prefixes split the general purpose range, and what do they mean?

WR is the commercial and automotive general purpose prefix, MR and SR are automotive-only.
That three-way split, and why filtering on WR alone mixes grades, is covered in full in
Walsin automotive chip resistors: MR, SR and the AEC-Q200 split.
What that post does not cover is that the prefix split is even across case size: every one of the
ten case sizes in the table above carries parts from more than one prefix, so the case size alone
never tells you which prefix you are looking at either.

For the power-rating pattern by case size across Walsin’s whole chip resistor catalogue, not
just general purpose, see
Chip resistor power rating by case size. The
full range is on the Walsin chip resistor range page.

The short version

Walsin’s general purpose chip resistor line is the largest single group in the chip resistor
catalogue at 75,628 parts, spread over ten case sizes and three prefixes. Two-thirds of the
non-jumper parts are E96, not E24, in every case size. A 420-part sub-line at 1206, 2010 and
2512 — marked with a space and a two-letter suffix — carries a higher rated power than the rest
of the line at the same resistance, and we have flagged it for written confirmation from Walsin.

Send us your general purpose BOM line and we will tell you which prefix, which case size and
which rated-power sub-line each part number sits in. 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 chip resistor 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.

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