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How to calculate the value of an SMD resistorMost chip resistors are marked with a 3-digit or 4-digit code - the numerical equivalent of the familiar for through-hole components. Recently, a new coding system (the EIA-96) has appeared on precision SMDs.The 3-digit codeStandard-tolerance SMD resistors are marked with a simple 3-digit code. The first two numbers will indicate the significant digits, and the third will be the multiplier, telling you the power of ten to which the two significant digits must be multiplied (or how many zeros to add). Resistances of less than 10 ohms do not have a multiplier, the letter 'R' is used instead to indicate the position of the decimal point.3-digit code examples. The 4-digit codeThe 4-digit code is used for marking precision surface mount resistors. It's similar to the previous system, the only difference is the number of significant digits: the first three numbers will tell us the significant digits, and the fourth will be the multiplier, indicating the power of ten to which the three significant digits must be multiplied (or how many zeros to add).
Resistances of less than 100 ohms are marked with the help of the letter 'R', indicating the position of the decimal point.4-digit code examples. Notes:. an SMD resistor with a marking of 0, 00, 000 or 0000 is a jumper (a zero-ohm link). 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). For example: 1 22 = 1.2kΩ 1%. Some manufacturers underline all three digits - do not confuse this with the code used on low value current sensing resistors. SMDs with values in order of milliohms, made for current sensing applications are often marked with the help of the letters M, m or L, showing the decimal point location (with the value in milliohms).
For example: 1M50 = 1.50mΩ, 2M2 = 2.2mΩ, 5L00 = 5mΩ.Current sensing SMDs can also be marked with a long bar on top ( 1m5 = 1.5mΩ, R001 = 1mΩ, etc.) or a long bar under the code ( 101 = 0.101Ω, 047 = 0.047Ω). The underline is used when the starting 'R' has to be omitted due to the limited space on the resistor's body. So, for example, R068 becomes 068 = 0.068Ω (68mΩ).