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SMD Inductor Code CalculatorDecoding surface-mount device (SMD) inductor markings requires strict attention to detail, as their coding conventions differ substantially from standard SMD resistors. This interactive SMD Inductor Code Calculator allows you to determine inductance of a SMD (surface mount device) inductor by the markings found on the device and to determine SMD inductor markings by inductance. It displays rated inductance and inductor tolerance. Whether you are designing a high-efficiency DC-DC buck converter, debugging a switch-mode power supply (SMPS) rail, or populating an RF tuning network, automated code parsing prevents costly hardware component mismatches. The foundational unit of measurement for stamped surface-mount inductors is the microhenry (µH). This tool supports 2- and 3-digit codes. "R" is used to indicate the position of a decimal point for µH values. For instance, a chip marked 4R7 stands for 4.7 µH, while R22 translates to 0.22 µH (or 220 nH). "N" is used to indicate the position of a decimal point for nH values. "D" is used to indicate ±0.3 nH tolerance, "J" - ±5% tolerance, "K" - ±10% tolerance, "M" - ±20% tolerance. How to Calculate Inductors ValueFrequently Asked QuestionsWhy does a code like "100" on an SMD inductor mean 10 µH instead of 100 µH? This is the single most common mistake made during manual bench assembly. Under the standard 3-digit marking scheme, the final digit is a multiplier exponent (10x), indicating how many zeros to append to the first two digits. For a code of 100, the multiplier is 100, which equals 1. Therefore, 10 × 1 = 10 µH. To represent a 100 µH inductor, the component must be stamped 101 (10 × 101 = 100).
Can I safely measure a blank SMD inductor directly on the PCB? No. Just like Multi-Layer Ceramic Capacitors (MLCCs), many ultra-small SMD inductors (especially in 0402 or 0603 footprints) are completely blank. Attempting to measure their value using an LCR meter while they are still soldered to the circuit board will yield completely false data, as the meter will read the parallel impedance paths of surrounding resistors, ICs, and decoupling caps. To get a true inductance reading, you must desolder at least one leg (or isolate the entire chip) and measure it out-of-circuit.
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