Contents
In this article, we will introduce you to SMD resistor calculator and reading program that enables you to read and know the SMD resistance code with quadrilateral, binary or EIA-96 code codes. In addition to the table of surface resistances clearly through which you can find the desired value according to the number written on the resistance.
Surface resistors are used in electrical circuit elements with many other surface aerosols such as surface transistors, surface capacitors and many other elements. Most of the craft factories of quality and reputation use this type away from the old elements. The installation of surface elements is fully automated, which saves time and also improves quality and reliability. There is no doubt that saving circuit space is an important factor because they occupy very small sizes compared to traditional elements and thus reduce production costs.
SMD resistor code calculator
1kΩ
In the previous program, modify the previous default resistance value and press the Find “FIND” button until you see the SMD resistance value. We will give some examples of resistor values:
3-digit code SMD resistance:
- 330 = 33*100 = 33*1 = 33Ω
- 342 = 34*102 = 34*100 = 3400Ω (3.4KΩ)
- 2R2 = 2.2Ω
- R23 = 0.23Ω
4-digit code SMD resistors:
- 1800 = 180*100 = 180Ω
- 3322 = 332*102 = 33200Ω (33.2KΩ)
- 1000 = 100*100 = 100Ω
- 1212 = 121*102 = 12100Ω (12.1KΩ)
resistors EIA-96:
- 14E = code 14 = 140 * Multiplier E = 140*10,000 = 1.37MΩ
- 10B = code 10 = 124 * Multiplier B = 124*10 = 1.24KΩ
- 78X = code 78 = 634 * Multiplier X = 634*0.1 = 63.4Ω
- 01A = code 01 = 100 * Multiplier A = 100 * 1 = 100Ω
How to calculate SMD resistor code
Before you start learning, you should know that there are some standards for coding surface resistors or SMD. Some are 3 digit codes and some are 4 digits or 4digit codes. Later, a new system for coding resistors called EIA-96 was adopted.
3-digit SMD resistors
Calculating 3-digit SMD resistors is very easy. The first and second digits denote a constant value. And the third digit denotes the multiplication factor or the number raised to the exponent of the number 10 which will be multiplied by the constant number.
Examples of the calculation method:
- 102 = 10*102 = 10*100 = 1000Ω (1KΩ)
- 103 = 10*103 = 10*1000 = 10000Ω (10KΩ)
- 472 = 47*102 = 47*100 = 4700Ω (4.7KΩ)
However, resistors with a value of less than 10 ohms do not have a multiplication factor and the factor is replaced by the letter R to indicate the place of the decimal point in the resistor value. As an example:
- 4R7 = 4.7Ω
- 5R2 = 5.2Ω
For resistors less than 1 ohm, the letter R is given at the beginning of the value, as in the following examples:
- R23 = 0.23Ω
- R34 = 0.34Ω
4-digit SMD resistors
Resistors on which the numbers printed as 4 digits consist in the method of calculation do not differ from the previous one. The first three digits are a constant number and the last digit expresses the multiplication factor, the exponent raised to 10. The best example is provided to understand the calculation method:
- 7792 = 779*102 = 77,900Ω (77.9KΩ)
- 1004 = 100*104 = 1,000,000Ω (1MΩ)
- 1000 = 100*100 = 100Ω
- 4700 = 470*100 = 470Ω
- 5102 = 510*102 = 51,000Ω (51KΩ)
However, we may need the number R to express the decimal point in the exact resistors. There may be resistors that have two numbers after the comma and are more accurate than other resistors and are used in sensitive circuits. Examples:
- R832 = 0.832Ω
- 95R21 = 95.21Ω
- 30R0 = 30Ω
- R100 = 0.1Ω
Thus, we have learned how to calculate the values of SMD resistors, and by looking now, we can know the value of each of them and we still have the EIA-96 coding system.
EIA-96 SMD Resistor Codes
These resistors have the same tolerance of 1%, i.e. they are precise resistors and the value change is only 1%. Its encoding consists of two numbers and a letter. The numbers indicate a certain fixed value that must be extracted from a special table that we will write to you. The letter denotes the multiplication factor and is also given in a table. We conclude that memorizing the values of these resistors is difficult because the table of fixed numbers consists of 92 different numbers. And the letters or multiplication factors are 12 characters.
For example, resistance with a value of 22X, we look at the value of 165 corresponding to the number 22, and we look at the table of letters or multiplication factors, and we see what corresponds to the letter x, which is 0.1. So now we multiply 165 * 0.1 = 16.5 so the resistance value is 16.5 ohms.
| code | value | code | value | code | value | code | value |
|---|---|---|---|---|---|---|---|
| 01 | 100 | 26 | 182 | 51 | 332 | 76 | 604 |
| 02 | 102 | 27 | 187 | 52 | 340 | 77 | 619 |
| 03 | 105 | 28 | 191 | 53 | 348 | 78 | 634 |
| 04 | 107 | 29 | 196 | 54 | 357 | 79 | 649 |
| 05 | 110 | 30 | 200 | 55 | 365 | 80 | 665 |
| 06 | 113 | 31 | 205 | 56 | 374 | 81 | 681 |
| 07 | 115 | 32 | 210 | 57 | 383 | 82 | 698 |
| 08 | 118 | 33 | 215 | 58 | 392 | 83 | 715 |
| 09 | 121 | 34 | 221 | 59 | 402 | 84 | 732 |
| 10 | 124 | 35 | 226 | 60 | 412 | 85 | 750 |
| 11 | 127 | 36 | 232 | 61 | 422 | 86 | 768 |
| 12 | 130 | 37 | 237 | 62 | 432 | 87 | 787 |
| 13 | 133 | 38 | 243 | 63 | 442 | 88 | 806 |
| 14 | 140 | 39 | 249 | 64 | 453 | 89 | 825 |
| 15 | 137 | 40 | 255 | 65 | 464 | 90 | 845 |
| 16 | 143 | 41 | 261 | 66 | 475 | 91 | 866 |
| 17 | 147 | 42 | 267 | 67 | 487 | 92 | 887 |
| 18 | 150 | 43 | 274 | 68 | 499 | 93 | 909 |
| 19 | 154 | 44 | 280 | 69 | 511 | 94 | 931 |
| 20 | 158 | 45 | 287 | 70 | 523 | 95 | 953 |
| 21 | 162 | 46 | 294 | 71 | 536 | 96 | 976 |
| 22 | 165 | 47 | 301 | 72 | 549 | – | – |
| 23 | 169 | 48 | 309 | 73 | 562 | – | – |
| 24 | 174 | 49 | 316 | 74 | 576 | – | – |
| 25 | 178 | 50 | 324 | 75 | 590 | – | – |
Here’s also the system’s multiplication factor table:
| Letter | factor | letter | factor |
|---|---|---|---|
| Z | 0.001 | B | 10 |
| Y | 0.01 | H | 10 |
| R | 0.01 | C | 100 |
| X | 0.1 | D | 1000 |
| S | 0.1 | E | 10,000 |
| A | 1 | F | 100,000 |
Examples of calculation of resistors with the system EIA-96
We will give you several examples of calculating values to prove the information:
- 10Y = code 10 * Multiplier Y = 124*0.01 = 1.24Ω
- 16X = code 16 * Multiplier X = 143*0.1= 14.3Ω
- 29B = code 29 * Multiplier B = 196*10 = 1.96kΩ
- 82A = code 82 * Multiplier A = 698*1 = 698Ω
- 07C = code 07 * Multiplier C =115 *100 = 11.5kΩ
- 01D = code 01 * Multiplier D = 100*1000 = 100kΩ
- 23E = code 23 * Multiplier E = 169*10,000 = 1.69MΩ
- 36F = code 36 * Multiplier F = 232*100,000 = 23.2MΩ
- 03D = code 03 *Multiplier D = 105 * 1000 = 105KΩ
- 08D = code 08 *Multiplier D = 118 * 1000 = 118KΩ
- 15D = code 15 *Multiplier D = 137 * 1000 = 137KΩ
- 13E = code 13 *Multiplier E = 133 * 10000 = 1.33MΩ
- 04F = code 04 *Multiplier F = 107 * 100000 = 10.7MΩ
- 33C = code 33 *Multiplier C = 215 * 100 = 21.5KΩ
- 19A = code 19 *Multiplier A = 154 * 1 = 154Ω
- 18X = code 18 *Multiplier X = 150 * 0.1 = 15Ω
- 60H = code 60 *Multiplier H = 412 * 10 = 4.12KΩ
- 06S = code 06 *Multiplier S = 113 * 0.1 = 11.3Ω
Zero SMD Resistance 000
During your work, you may encounter some resistances with a value of 000, 00 or 0 and you are confused about their value. In fact, it has the same shape as the surface resistance, except that it is not a resistor, but only an electrical connection or jumber. Thus, it does not give any resistance to the passage of electric current and its value is definitely 0 ohms.
Knowing the capacity of surface resistance
You may be wondering how to know how to know what the maximum surface resistance capacity or watt it withstands. Here it should be noted that the manufacture of these resistors is done with high accuracy because the amount of heat dispersed from these resistors is small. You can tell the value of the surface resistance capacity from its magnitude. The following table shows the bundles of standard resistors, the size of each and the capacity of each type.
| Package | Size MM | Size INCHES | TYPICAL POWER RATING (W) |
|---|---|---|---|
| 2512 | 6.30 x 3.10 | 0.25 x 0.12 | 0.50 (1/2) |
| 2010 | 5.00 x 2.60 | 0.20 x 0.10 | 0.25 (1/4) |
| 1210 | 3.20 x 2.60 | 0.12 x 0.10 | 0.25 (1/4) |
| 1206 | 3.0 x 1.5 | 0.12 x 0.06 | 0.125 (1/8) |
| 0805 | 2.0 x 1.3 | 0.08 x 0.05 | 0.1 (1/10) |
| 0603 | 1.5 x 0.08 | 0.06 x 0.03 | 0.0625 (1/16) |
| 0402 | 1 x 0.5 | 0.04 x 0.02 | 0.0625 (1/16) |
| 0201 | 0.6 x 0.3 | 0.02 x 0.01 | 0.05 |
Popular SMD resistors
- 102 smd resistor value is 1kΩ
- 101 smd resistor value is 100 Ohm
- 100 smd resistor value is 10 Ω
- 104 smd resistor value is 100KΩ
- 01C smd resistor value is 10kΩ
- 1002 smd resistor value is 10kΩ
- 30C smd resistor value is 20 kΩ
- 1R00 smd resistor value is 1 Ω
- 1000 smd resistor value is 100 Ω
- 105 smd resistor value is 1 MΩ
- 1001 smd resistor value is 1 KΩ