Answer
What is an SMD resistor code calculator?
An SMD resistor code calculator is a tool used to determine the resistance value of an SMD resistor based on the digits painted on it. A calculator simplifies the process of decoding these digits to get the accurate resistance value.
What is a resistor?
A resistor is a passive electrical component that opposes the flow of electric current. It's used to reduce current flow, adjust signal levels, divide voltages, and terminate transmission lines, among other functions. The resistance value in ohms can be determined by the digits printed on the SMD resistor.
What is resistance in a resistor?
Resistance in a resistor is a measure of the opposition to the flow of electric current. It's measured in ohms (Ω) and determines how much the resistor will reduce the current flow in a circuit. The resistance value is encoded in the digits printed on the SMD resistor. A higher resistance value means more opposition to the current flow, and a lower resistance value means less opposition.
What are digits in an SMD resistor?
In an SMD resistor, the "digits" refer to the numerical values of resistance. They are representing the value of the resistance differently depending on the coding system used on that resistor. The well-known systems are 3 Digit EIA, 4 Digit EIA, and 3 Digit EIA-96.
What is 3 Digit EIA system?
This coding system has 3 digits. Starting from left, the first two digits represent the resistance value, and the third digit represents the multiplier, which is 10 to the power of a value ranged from 0 to 9. All three together form the final value of the resistor measured in ohms.
For example, a resistor with code 100 means 10 * 10^0 = 10 * 1 = 10 Ohm.
The first and third digits in this system range from 0 to 9. The same thing for the second digit except for the letter R added to the range. The letter R means "." decimal point.
For example, a resistor with code 4R7 means 4.7 Ohm.
What is 4 Digit EIA system?
This coding system has 4 digits. Starting from left, the first three digits represent the resistance value, and the fourth digit represents the multiplier, which is 10 to the power of a value ranged from 0 to 9. All four together form the final value of the resistor measured in ohms.
For example, a resistor with code 7392 means 739 * 10^2 = 739 * 100 = 73900 Ohm = 73.9 KOhm.
The first and fourth digits in this system range from 0 to 9. The same thing for the second and third digits except for the letter R added to the range. The letter R means "." decimal point.
For example, a resistor with code 0R22 means 0.22 Ohm.
For example, a resistor with code 30R9 means 30.9 Ohm.
What is 3 Digit EIA-96 system?
This coding system has 3 digits. The first two digits represent a value of three digits. The first two digits range from 01 to 96. The third digit consists of letters only, and it represents the multiplier, which is 10 to the power of a value ranged from -3 to 5.
For example, a resistor with code 12E means 130 * 10^4 = 1300000 Ohm = 1.3 MOhm.
| First Two Digits EIA-96 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Code | Value | Code | Value | Code | Value | Code | Value | Code | Value | Code | Value |
| 01 | 100 | 02 | 102 | 03 | 105 | 04 | 107 | 05 | 110 | 06 | 113 |
| 07 | 115 | 08 | 118 | 09 | 121 | 10 | 124 | 11 | 127 | 12 | 130 |
| 13 | 133 | 14 | 137 | 15 | 140 | 16 | 143 | 17 | 147 | 18 | 150 |
| 19 | 154 | 20 | 158 | 21 | 162 | 22 | 165 | 23 | 169 | 24 | 174 |
| 25 | 178 | 26 | 182 | 27 | 187 | 28 | 191 | 29 | 196 | 30 | 200 |
| 31 | 205 | 32 | 210 | 33 | 215 | 34 | 221 | 35 | 226 | 36 | 232 |
| 37 | 237 | 38 | 243 | 39 | 249 | 40 | 255 | 41 | 261 | 42 | 267 |
| 43 | 274 | 44 | 280 | 45 | 287 | 46 | 294 | 47 | 301 | 48 | 309 |
| 49 | 316 | 50 | 324 | 51 | 332 | 52 | 340 | 53 | 348 | 54 | 357 |
| 55 | 365 | 56 | 374 | 57 | 383 | 58 | 392 | 59 | 402 | 60 | 412 |
| 61 | 422 | 62 | 432 | 63 | 442 | 64 | 453 | 65 | 464 | 66 | 475 |
| 67 | 487 | 68 | 499 | 69 | 511 | 70 | 523 | 71 | 536 | 72 | 549 |
| 73 | 562 | 74 | 576 | 75 | 590 | 76 | 604 | 77 | 619 | 78 | 634 |
| 79 | 649 | 80 | 665 | 81 | 681 | 82 | 698 | 83 | 715 | 84 | 732 |
| 85 | 750 | 86 | 768 | 87 | 787 | 88 | 806 | 89 | 825 | 90 | 845 |
| 91 | 866 | 92 | 887 | 93 | 909 | 94 | 931 | 95 | 953 | 96 | 976 |
| Third Digit (Multiplier) EIA-96 | |
|---|---|
| Z | 10^-3 |
| R/Y | 10^-2 |
| S/X | 10^-1 |
| A | 10^0 |
| B/H | 10^1 |
| C | 10^2 |
| D | 10^3 |
| E | 10^4 |
| F | 10^5 |
How to find the tolerance of an SMD resistor?
To find the tolerance of an SMD resistor you need to read the datasheet of the resistor or contact the manufacturer. The tolerance of an SMD resistor varies from 0.01% to 30%.