Ceramic Resistor Markings

A wire wound resistor is a resistor where a wire with a high resistivity is wrapped around an insulating core to provide the resistance.

Ceramic resistor markings. Wire wound resistor construction varies widely. Letter and digit codes to indicating resistor values. In this system the marking exists out of three digits. The colors on the first 2 or 3 bands correspond to numbers from 0 to 9 which represent the significant digits of the resistor s ohmic value.

Resistors letters and digit codes. Three methods of resistor markings are predominant color coding numerical value coding and three digit symbol coding. An smd resistor with a marking of 0 00 000 or 0000 is a jumper a zero ohm link. Basic resistor values range from 0 1 ohm to 10 megaohms.

Therefore the eia 96 marking system has been created. The last band gives the multiplier. For example a resistor with brown green and green bands is rated at 15 mega ohms 15 000 000 ohms. 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.

With that knowledge realize that on a four band resistor the third color will always be blue 106 or less and on a five band resistor the fourth color will always be green 105 or. Example of a wire wound resistor construction. 2 numbers to indicate the resistor value and 1 letter for the multiplier. Position the resistor with this band on the right side and again read your resistor from left to right.

It is based on the e96 series thus aimed at resistors with 1 tolerance. Tolerance temperature package style and failure rate are integrated into some numbering schemes. This tool is for reference only. In the resistor shown in the preceding figure the two digit number is 47 and the multiplier is 10 so the nominal value is an easy way to multiply a whole number by a power of 10 that is 10 0 10 1 10 2 10 3 and so on is to just append meaning tack on to the end the whole number with zeros and use the exponent which is the small.

The manufacturing and choice of materials used is dependent on the way the resistor will be used in. I do not guarantee correctness of any information provided. Mil prf 55342 assigns part numbers using alpha numeric coding.