E24 vs E96 Walsin Resistor Values: Which Series Give You Which

Two of Walsin Technology (Walsin)’s thirteen resistive chip resistor series groups publish E24
values only; every other series group mixes E24 and E96, and one — Metal Low Ohm Current Sense —
mostly follows neither. Measured across all 234,815 rows of Walsin’s chip resistor export: the
two E24-only groups are Thick Film Trimmable Chip Resistor (2,940 parts) and Thick Film Chip
Resistor Network, Convex Type (97 of 98 parts).

Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 137 of Walsin’s chip
resistor export files and both Walsin chip resistor datasheets. Resistance in the shared
ten-column schema is written in plain ohms with no multiplier, which this post parses into a
decade mantissa for every row to classify it against the standard E24 and E96 series defined in
IEC 60063. Every part number below is real.

What is the difference between an E24 and an E96 resistor value?

E24 gives 24 resistance values per decade, E96 gives 96. Both are defined in IEC 60063 and both
datasheets Venatech holds — WR and MR — cite that standard directly. A decade running from
10 kΩ to 11 kΩ holds only two E24 values, 10 kΩ and 11 kΩ, but five E96 values: 10.0, 10.2, 10.5,
10.7 and 11.0 kΩ. Five real Walsin 0603, ±1%, 1/10 W part numbers from the same series show this
directly, in strict resistance order:

| Part number | Resistance | Match / mismatch |
|—|—|—|—|
| WR06X1002FTL | 10.0 kΩ | E24 value |
| WR06X1022FTL | 10.2 kΩ | Mismatch — E96 only, not an E24 value |
| WR06X1052FTL | 10.5 kΩ | Mismatch — E96 only, not an E24 value |
| WR06X1072FTL | 10.7 kΩ | Mismatch — E96 only, not an E24 value |
| WR06X1102FTL | 11.0 kΩ | E24 value |

Three of the five part numbers above exist purely because Walsin also carries E96. Drop E96 from
your search and those three resistance values disappear from the result, even though the part
numbers are real and in stock-eligible series.

Which Walsin series groups are E24 only?

Two, out of thirteen resistive series groups in the extract. Both are complete — not a case-size
exception, the whole group:

WK12M1R0XTL (Trimmable, 1.0 Ω) and WT04X100JTL (Network Convex Type, 10 Ω) are real parts
from each group. Neither series publishes a single E96-only value anywhere in the extract — not
one part number in 2,940 Trimmable rows or 97 non-jumper Network Convex rows sits on an E96-only
mantissa.

Which Walsin series groups mix E24 and E96?

All eleven of the remaining resistive series groups, in varying proportions:

High Precision Thick Film carries the highest E96 share in the catalogue at 78.8% — precision
parts need the finer step. Thick Film Anti-Surge sits noticeably lower, at 34.6%, closer to an
even split than any other mixed group. Metal Low Ohm Current Sense is the outlier discussed
below: only 1.5% of its non-zero values are E96, because most of them are not E24 or E96 at all.

For how this split plays out inside the largest single group, general purpose, including its
case-size spread, see
Walsin’s general purpose chip resistor range.

How do you read Walsin’s E96 marking code?

Both the WR and MR datasheets print the identical 96-entry CODE table, mapping a two-digit code
to a three-digit mantissa, read against a one-letter decade index: Y=10⁻², X=10⁻¹, A=10⁰,
B=10¹, C=10², D=10³, E=10⁴, F=10⁵. CODE 25 maps to mantissa 178, so 25X reads as
17.8 Ω, 25A as 178 Ω, 25B as 1.78 kΩ, and so on up the same two digits. A 0402 part carries no
marking at all on either datasheet; 0603 carries 3-digit marking at both 5% and 1%; 1206, 0805
and 1210 (MR only) carry 3-digit marking at 5% and 4-digit at 1%.

Walsin’s own E24/E96 wording differs slightly between the two PDFs: WR’s functional description
states 1% parts are drawn from “the E96 series,” while MR’s states “E24+E96 series” for the same
tolerance. Both state 5% parts are E24. For the full field-by-field reading of both datasheets,
see
WR and MR series compared, field by field.
Source for the marking table: Walsin_WR_General_Purpose_Chip_Resistor.pdf page 4 and
Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf page 5, both held on file with no public URL.

Why don’t current sense resistors follow E24 or E96 at all?

Because very low resistance values are specified as linear steps, not log-decade values. Metal
Low Ohm Current Sense Chip-Resistor is 51.2% E24, 1.5% E96 and 47.3% neither — the largest
non-standard share of any series group in the catalogue. A real example: WW12XR025FTL,
WW12XR026FTL, WW12XR035FTL, WW12XR040FTL, WW12XR045FTL and WW12XR050FTL run 0.025 Ω,
0.026 Ω, 0.035 Ω, 0.040 Ω, 0.045 Ω and 0.050 Ω — even, linear 1–5 mΩ spacing that does not land on
any E24 or E96 mantissa.

| Part number | Resistance | Match / mismatch |
|—|—|—|—|
| WW12XR025FTL | 0.025 Ω | Mismatch — not on the E24 or E96 series |
| WW12XR026FTL | 0.026 Ω | Mismatch — not on the E24 or E96 series |
| WW12XR035FTL | 0.035 Ω | Mismatch — not on the E24 or E96 series |
| WW12XR050FTL | 0.050 Ω | Mismatch — not on the E24 or E96 series |

At milliohm level, resistive heating and voltage drop scale with absolute value, not with a log
ratio, which is why linear steps make more practical sense for current-sense design than an
E-series does. The full range is on the
Walsin chip resistor range page.

The short version

Most of Walsin’s chip resistor catalogue runs on E96, with E24 values sitting inside it as the
coarser quarter. Two series groups break that pattern entirely and publish E24 only — Trimmable
and Network Convex Type. One more breaks it the other way — Metal Low Ohm Current Sense mostly
follows neither series, because current-sense values are linear, not logarithmic. Check the
series group, not just the resistance value, before assuming a fine E96 step exists.

Send us the resistance value and series you need and we will tell you whether it is E24, E96,
or off the series entirely. Or give us one part number and ask us to cross it.

Already holding a part number? Paste it into the cross-reference tool — it reads the manufacturer from the number itself, returns the Walsin chip resistor candidates and states every field that differs rather than calling anything an alternative. Then check Hong Kong ready stock to see what is on the shelf today.

Frequently asked questions