Chip Resistor Stock by Case Size: 13 of Walsin’s 19 Case-Size Labels Hold Zero Lines on Our Hong Kong Shelf

Chip resistor stock by case size is lopsided: six of Walsin’s 19 case-size labels hold all 249 matched chip resistor lines on our Hong Kong shelf, and 13 hold none. Those 13 are 48,475 catalogue part numbers, 20.7 percent. Per thousand catalogue part numbers, 0402 is covered about 32 times deeper than 2512.

If you are designing around a 2010 or a 1210 and you read “chip resistors in stock” on a distributor’s page, you have been told nothing. Venatech Limited, an authorised Walsin distributor in Hong Kong, took its ready-stock snapshot of 23 September 2026 and set the 254 lines labelled chip resistor against the 234,401 distinct part numbers in the chip resistor exports of Walsin Technology (Walsin). We parsed every line, joined 249 of them to a catalogue row in the Walsin_ChipR_Product_Data exports with spaces removed, and counted by the case-size label Walsin prints in its Size column. Every part number below is real. Every figure is a part-number count, not a piece count.

Which chip resistor case sizes does the Hong Kong shelf cover?

Six. We counted the 249 lines that join the export: 100 at 0603, 80 at 0402, 33 at 1206, 30 at 0805, 4 at 0201 and 2 at 2512. The catalogue prints 19 distinct case-size labels, and 13 of them have no stocked line. The shelf is not a small copy of the catalogue. It is a different shape.

0603 and 0402 together are 30.0 percent of the catalogue and 72.3 percent of the shelf. Five more lines on the snapshot carry the chip resistor label and do not join: three WF codes whose catalogue twin differs by one character at the tolerance position, one code with a four-zero resistance field, and one varistor code filed under a resistor label. We left all five out of the counts.

How uneven is shelf coverage per thousand catalogue part numbers?

By a factor of about 32 between the best and the worst stocked size. We divided stocked lines by catalogue part numbers and scaled to a thousand. 0402 scores 2.86 stocked lines per thousand catalogue part numbers, 0603 scores 2.36, 1206 scores 0.88, 0805 scores 0.79, 0201 scores 0.22 and 2512 scores 0.09. 80 of 27,961 against 2 of 22,154.

We read the pack quantity from the shelf list’s SPQ column, which is filled on all 254 chip resistor lines. The pack quantity moves the other way. Smaller bodies pack 15,000 and 10,000 to the reel, larger ones 5,000 and 4,000, and every stocked size carries exactly one pack quantity. For the packaging column behind those numbers, see chip resistor reel quantity.

Which 13 case-size labels hold no stocked line, and how much of the catalogue is that?

48,475 catalogue part numbers, or 20.7 percent. We summed every label with a stocked count of zero. 2010 and 1210 alone are 39,087 part numbers, 16.7 percent of the catalogue, and neither has a line on the shelf. The remaining eleven are 1218, 0612, two spellings of 1225, 1020, 01005, three multi-element array labels, 0306 and 0815.

We have not seen this counted anywhere: the share of a manufacturer’s chip resistor catalogue that a distributor’s own shelf cannot touch, measured by the manufacturer’s own case-size label. It is not a flaw in the shelf. It is the cost of 19 sizes, and the number a buyer needs before assuming “in stock” covers a 2010. The two spellings of 1225 are a separate Walsin data issue that we published in one case size, two metric codes: the 1225 problem.

Does the shelf cover the rated-power range inside each stocked size?

No, and the gap is wider than the size gap. We counted distinct rated powers per case size in the catalogue and on the shelf. 0603 carries 6 rated powers in the catalogue and the shelf holds 1: all 100 stocked 0603 lines are 1/10 W. 0402 shows 5 against 1, 0201 shows 2 against 1, and 2512 shows 3 against 1.

A 0603 resistor that must dissipate 1/4 W is a catalogue part, not a shelf part. Our reading of the power steps themselves is in chip resistor power rating by case size.

Which series do the stocked chip resistor lines come from?

Six of 58 series and five of 14 series groups. We grouped the 249 lines by the export’s Series Group. Thick Film General Purpose supplies 236 of 249 lines, 94.8 percent, from a group that is 32.3 percent of the catalogue. The other four stocked groups supply 13 lines between them.

Read by export file instead of by group and the concentration tightens: Thick_Film_General_Purpose_1_1_10W.xlsx supplies 78 lines, Thick_Film_General_Purpose_5.xlsx 62 and Thick_Film_General_Purpose_1_1_16W.xlsx 53. Three files in the Walsin_ChipR_Product_Data folder hold 193 of 249 lines, 77.5 percent, counting each code in the first file where we found it. High Voltage alone is 20,244 part numbers with no line. If your need sits in one of the nine, the shelf cannot help and a cross is the right first move.

What should a buyer on a 2010, 1210 or 01005 line do?

Cross it, enquire, and do not assume. The shelf is a dated snapshot as at 23 September 2026, 1,125 part numbers across all lines, of which 254 are labelled chip resistor. A size with zero lines is not a size Walsin does not make: 2010 has 20,938 catalogue part numbers. Paste up to 500 part numbers into the free cross-reference tool, read the ready stock page for what sits in Hong Kong today, and ask us for the rest.

We hold 28 Walsin datasheets, 451 pages, and two of them cover chip resistors. Neither covers 2010, 1210 or 01005 as a stated size, so for those we will say what the export prints and nothing more. The product range sits on the chip resistor page.

The short version

We counted 249 stocked chip resistor lines against 234,401 catalogue part numbers. Six of 19 case-size labels hold every line. 13 hold none, and those 13 are 20.7 percent of the catalogue. 0402 is covered 2.86 lines per thousand, 2512 only 0.09. 0603 shows 1 rated power of 6. General Purpose is 94.8 percent of the shelf. We will not tell you “chip resistors in stock” means your chip resistor. We will tell you which of 19 sizes it means. Qualification stays with you.

Send us your 2010, 1210 or 01005 list and we will tell you what the shelf holds and what needs a cross. And a question back: how many of your approved resistor lines sit in a size the distributor you use has never stocked?

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