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What is a resistor?

Regarding chip resistor sizes

The external dimensions of chip resistors are typically designated using company-specific notation and are indicated in both mm and inches.

ROHM
Part No.
Chip Size mm inch
L W
***004 0.4mm × 0.2mm 0402 01005
***006 0.6mm × 0.3mm 0603 0201
***01 1.0mm × 0.5mm 1005 0402
***03 1.6mm × 0.8mm 1608 0603
***10 2.0mm × 1.2mm 2012 0805
***18 3.2mm × 1.6mm 3216 1206
***25 3.2mm × 2.5mm 3225 1210
***50 5.0mm × 2.5mm 5025 2010
***100 6.4mm × 3.2mm 6432 2512
Regarding chip resistor sizes

***Represents part numbers (excluding chip networks)

Electronics
Fundamentals