Chip Resistor Resistance Range by Case Size: Where Walsin’s Catalogue Actually Stops

Walsin Technology (Walsin)’s chip resistor resistance range does not stop at one ceiling — it
stops at four, depending on case size. Six case sizes (0402, 0603, 0805, 1206, 2010, 2512)
reach 100 MΩ. Two (0201, 1218) stop at 10 MΩ. One (1210) stops at exactly 22 MΩ, set by a single
line. Four more (01005, 0612, 1020, 1225) stop at 1 MΩ. Measured across all 234,815 chip resistor
rows Venatech holds.

Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 137 of Walsin’s chip
resistor export files, 234,815 rows on one shared ten-column schema. Resistance in that schema is
written in plain ohms with no multiplier — 10 kΩ appears as 10000Ω, 10 MΩ as 10000000Ω — and
this post parses every row numerically to find the real minimum and maximum at each case size.
Every part number below is real; counts are of part numbers, not pieces.

What is the resistance range of a Walsin chip resistor by case size?

Fifteen case sizes appear in the extract, two of them (0306, 0815) carrying only current-sense
parts in a narrow sub-ohm band. Excluding 0 Ω jumpers, the range at each size is:

What is the maximum resistance value in each case size?

100 MΩ at the six largest and most common sizes, and no higher than that anywhere in the
catalogue. Six real part numbers, one per 100 MΩ case size, each confirmed against the extract:

No case size in the Walsin chip resistor extract exceeds 100 MΩ. Reaching that figure needs a
0402 or larger case, and the series that sets it changes from size to size — High Power at the
two smallest, then a mix of High Ohm and High Voltage above that.

Why does 1210 stop at 22 megohm instead of 10 or 100 megohm?

Because one line, Thick Film Anti-Surge Chip Resistor, publishes a 1210 part at 22 MΩ and
nothing higher. 1210 sits between 1206 (100 MΩ ceiling) and 1218 (10 MΩ ceiling) by case
dimension, but its own ceiling matches neither neighbour:

Six real part numbers in the extract share the 22 MΩ figure at 1210, all Anti-Surge, all 1/2 W,
differing only in packaging and tolerance suffix. The next value down, 20 MΩ, is also Anti-Surge.
No General Purpose, High Power, High Voltage or High Ohm part publishes a 1210 value above 22 MΩ
— the case size simply is not offered in those series at that resistance. 22 MΩ is not a round
decade step on any E-series; it is the real published ceiling of one line, not a target anyone
designed to.

What is the minimum resistance value in each case size?

As low as 0.5 mΩ, and it is always a current-sense line, never a general purpose one. The floor
at every size with sub-ohm parts belongs to Metal Low Ohm Current Sense or Thick Film Low Ohm
Current Sense:

The two metal-element current-sense sizes, 0612 and 1225, and the largest size, 2512, all bottom
out at the identical 0.5 mΩ figure. No general purpose, high power or high voltage part comes
anywhere near that floor at any case size — their lowest values sit in the ohms, not the
milliohms.

Which series sets the ceiling, and which sets the floor?

Current-sense lines (Metal Low Ohm and Thick Film Low Ohm) set every floor in the catalogue. The
ceiling is set by a different series depending on case size: High Power at the two smallest
sizes that reach 100 MΩ, High Ohm and High Voltage above that, General Purpose (specifically the
automotive MR prefix) at the two sizes that stop at 10 MΩ, Anti-Surge alone at 1210, and
General Purpose or Wide Terminal Power at the four sizes that stop at 1 MΩ. No single series name
covers the catalogue’s resistance ceiling end to end — the reader has to check case size and
series together, not resistance value alone.

For the power-rating pattern that runs alongside this resistance spread, see
Chip resistor power rating by case size. For the
general purpose line specifically, including its own case-size spread, see
Walsin’s general purpose chip resistor range.
The full range is on the Walsin chip resistor range page.

The short version

Walsin’s chip resistor catalogue has no single resistance ceiling. It has four: 100 MΩ at six
case sizes, 10 MΩ at two, 22 MΩ at 1210 alone, and 1 MΩ at four more. The floor, wherever a
case size goes below 1 Ω, always belongs to a current-sense line. Check both case size and series
group before assuming a value exists — a 100 MΩ part in 0603 tells you nothing about whether
100 MΩ exists in 1210.

Send us the resistance value and case size you need and we will tell you which series
actually reaches it. Or give us one part number and ask us to cross it.

Check it against the catalogue yourself. Cross-reference accepts one part number or a whole BOM column and prints the mismatches as plainly as the matches — qualification stays with you, which is the honest division of labour. Ready stock covers the chip resistor lines held in Hong Kong.

Frequently asked questions