## PCB Design Glossary

Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

### E

#### E-series

Inductors, Resistors, Capacitors, etc... have standard values based largely on the equation where m is an E-Series value $m=3\times2^x\;x\in {1,2,3,4,5,6}={6,12,24,48,96,192}$ and n is a positive integer less than m.

Each order-of-magnitude is logarithmically broken into a set number of values.  For E24 series, those values are 1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.9, 3.2, 3.5, 3.8, 4.2, 4.6, 5.1, 5.6, 6.2, 6.8, 7.5, 8.3, 9.1

 $\sqrt{10^0}=1.0$ $\sqrt{10^1}\approx 1.1$ $\sqrt{10^2}\approx 1.2$ $\sqrt{10^3}\approx 1.3$ $\sqrt{10^4}\approx 1.5$ $\sqrt{10^5}\approx 1.6$ $\sqrt{10^6}\approx 1.8$ $\sqrt{10^7}\approx 2.0$ 1.0 Ω 1.1 Ω 1.2 Ω 1.3 Ω 1.5 Ω 1.6 Ω 1.8 Ω 2.0 Ω 10 Ω 11 Ω 12 Ω 13 Ω 15 Ω 16 Ω 18 Ω 20 Ω 100 Ω 110 Ω 120 Ω 130 Ω 150 Ω 160 Ω 180 Ω 200 Ω 1 kΩ 1.1 kΩ 1.2 kΩ 1.3 kΩ 1.5 kΩ 1.6 Ω 1.8 Ω 2 kΩ

 $\sqrt{10^8}=2.2$ $\sqrt{10^9}\approx 2.4$ $\sqrt{10^10}\approx 2.6\\ \Rightarrow2.7$ $\sqrt{10^11}\approx 2.9\\ \Rightarrow3.0$ $\sqrt{10^12}\approx 3.2\\ \Rightarrow 3.3$ $\sqrt{10^13}\approx 3.5\\ \Rightarrow3.6$ $\sqrt{10^14}\approx 3.8\\ \Rightarrow3.9$ $\sqrt{10^15}\approx 4.3$ 2.2 Ω 2.4 Ω 2.7 Ω 3.0 Ω 3.3 Ω 3.6 Ω 3.9 Ω 4.3 Ω 22 Ω 24 Ω 27 Ω 30 Ω 33 Ω 36 Ω 39 Ω 43 Ω 220 Ω 240 Ω 270 Ω 30 Ω 330 Ω 360 Ω 390 Ω 430 Ω 2.2 kΩ 2.4 kΩ 2.7 kΩ 3.0 kΩ 3.3 kΩ 3.6 kΩ 3.9 kΩ 4.3 kΩ

 $\sqrt{10^16}=4.6\\ \Rightarrow 4.7$ $\sqrt{10^17}\approx 5.1$ $\sqrt{10^18}\approx 5.6$ $\sqrt{10^19}\approx 6.2$ $\sqrt{10^20}\approx 6.8$ $\sqrt{10^21}\approx 7.5$ $\sqrt{10^22}\approx 8.3\\ \Rightarrow 8.2$ $\sqrt{10^23}\approx 9.1$ 4.7 Ω 5.1 Ω 5.6 Ω 6.2 Ω 6.8 Ω 7.5 Ω 8.2 Ω 9.1 Ω 47 Ω 51 Ω 56 Ω 62 Ω 68 Ω 75 Ω 82 Ω 91 Ω 470 Ω 510 Ω 560 Ω 620 Ω 680 Ω 750 Ω 820 Ω 910 Ω 4.7 kΩ 5.1 kΩ 5.6 kΩ 6.2 kΩ 6.8 kΩ 7.5 kΩ 8.2 kΩ 9.1 kΩ

and the series would repeat for each multiple of 10 up into the MΩ range. 