A chip resistor marked with the standard 3 digit code and a short bar below the marking denotes a precision 1 or less resistor with a value taken from the e24 series these values are usually reserved for 5 resistors. This code contains the width and height of the package.
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In the table below the most common packages are given in imperial units with the metric equivalent.
Size of smd resistor. The smallest size is the 0201 package which measures a tiny 06mm x 030mm. Generally the land width should be 07 to 08 times w of the width of chip resistor. Smd packages may be given in inches as well as in milimeters.
This is not 100 ohms but it follows the scheme exactly and it is 10 x 10 0 or 10 x 1 10 w. You can find surface mount resistors as large as 63mm x 31mm which is referred to as size 2512. In smd resistors resistor package designators tell the length and width of the resistor.
Even though close tolerance resistors may not be required. Recommended soldering conditions. In case of re ow soldering solder amount can be adjusted therefore the land width should be set to 10 to 13 times chip resistor width w.
Normally 5 2 and 1 are widely available. So in the example of 0603 imperial code this indicates a length of 0060 and a width of 0030. In view of the fact that smd resistors are manufactured using metal oxide film they available in relative close tolerance values.
Resistors chip resistor surface mount are in stock at digikey. Therefore an smd resistor with the figures 472 would have a resistance of 47 x 10 2 ohms or 47kw. Three figure smd resistor marking code.
However beware of resistors marked with figures such as 100. It is therefore important to check the manufacturers documentation. Keep in mind that every manufacturer may have a variation of the measurements and power ratings other than what is in the chart below.
Resistors ship same day. An smd resistor with a marking of 0 00 000 or 0000 is a jumper a zero ohm link. Examples of 4 digit smd resistor codes 2500 250 x 10 0 250 x 1 250 w this is only and only 250 w not 2500 w 1000 100 x 10 0 100x 1 100 w 7201 720 x 10 1 720 x 10 7200 w or 72kw.
For specialist applications 05 and 01 values may be obtained. Recommendations and precautions are described below. The size of smd resistors is indicated by a numerical code such as 0603.
The capacitors and resistors pictured are 0603 1608 metric package sizes along with a very slightly larger 0805 2012 metric ferrite bead.
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