Pricing and Availability on millions of electronic components from Digi-Key Electronics. And since we’re discussing common instances in this post, it may be warranted to note that most commercial tolerances fall in the 1% to 10% range. RC0603JR-071ML 1 MOhms 5 0.1W, 1/10W Chip Resistor 0603 (1608 Metric) Moisture Resistant Thick Film from YAGEO. ![]() The tightest tolerance I have ever seen on a resistor is 0.001%, so it feels safe to say that you will never encounter a perfect resistor with no tolerance at all. Offering a 5k resistor would be redundant for a product offering. This means that the actual resistance value can be as low as 4940 ohms or as high as 5039.9 ohms and still be deemed acceptable. In the example given above for 4.99k ohms, let’s take a look at a 1% tolerance. Keep in mind too that tolerances play a part in common values. Select the number of bands, then their colors to determine the value and tolerance of the resistors. Choose the code format: three digit EIA, four digit EIA, or EIA-96. Because of this, common values are typically less expensive and more readily available (aka “stocking”) than non-common values. This tool is used to decode information for color banded axial lead resistors. The surface mount resistor code calculator can be used to determine the resistance value of an SMD resistor using the markings found on the device. Higher temperature operation requires derating of the resistor’s rated load or the selection of a device with an appropriately higher. This explains why you find more resistor options in a common value such as 4.99k ohms rather than values like 5k ohms. T2FD Antenna - Terminated and twisted folded dipole - T2FD is a 600-900 ohms folded dipole, terminated with resistor. Commodity thick-film surface mount resistors in the popular 0402 (1.0 mm x 0.5 mm) and 0603 (1.6 mm x 0.8 mm) sizes offer resistances in the range of 1 to 10 M and typically handle up to 0.1 W at 70C. This process helps simplify inventory and purchasing needs. The values are calculated using some math magic (see: Renard Series & E series of Preferred Numbers). Standards are set in place that help determine common resistor and capacitor values.
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