With the continuous development of electronic products,Chip resistorAs a basic component in electronic components, it is widely used in various circuit boards. patchresistanceThere are various methods of marking resistance values, among which the four-digit resistance value expression of chip resistors has attracted widespread attention due to its accuracy and application range. This article will comprehensively analyze the expression of the resistance value of the four-digit chip resistor to help readers deeply understand its coding rules and applications.
1. Basic concepts of four-digit chip resistorsChip resistor, referred to as SMD resistor, refers to the resistive component in surface mount technology (Surface Mount Device). The resistance value is usually represented by a combination of numbers and letters for quick identification. Four-digit chip resistors use four numeric characters to indicate the resistance value, which is suitable for resistors with higher precision.
2. Structure of the four-digit chip resistor resistance expressionThe four-digit chip resistor resistance expression consists of the first three digits and the last multiplier. The first three digits represent significant digits, and the last digit represents the power of 10 multiplied to. For example, the resistance value "1234" means 12.3×10^4 ohms, which is 123000 ohms.
3. Specific coding rulesThe first three digits: represent the significant digits of the resistor and directly represent the first three digits of the resistance value.
The fourth digit: represents the multiplier, multiplied by 10 to the power of the number.
If the fourth digit is "0", it means multiplying by 10^0 to get 1; if it is "1", it means multiplying by 10^1 to get 10; and so on.
4. The actual multiplier corresponding to the multiplier number| Multiplier Number | Actual Multiplier |
|---------|----------|
| 0 | 1 |
| 1 | 10 |
| 2 | 100 |
| 3 | 1,000 |
| 4 | 10,000 |
| 5 | 100,000 |
| 6 | 1,000,000|
5. Give an example of the resistance value of a four-digit chip resistorExample: Number "4725"
The first three digits "472" represent 472
The fourth digit "5" means multiplying by 10^5
Therefore, the resistance value = 472×10^5 = 47,200,000 ohms, or 47.2MΩ.
6. The difference between four-digit resistance expression and three-digit expressionThree-digit chip resistors usually consist of two significant figures and one multiplier, and are suitable for resistors with a smaller resistance range. The four-digit chip resistor increases the number of effective digits and can express the resistance value more accurately, which is suitable for high-precision requirements.
7. Advantages of four-digit chip resistors in practical applicationsHigh precision: one more significant figure, the resistance value is more accurate.
Easy to identify: standardized expression to facilitate automated identification.
Wide range of applications: suitable for precision instruments, communication equipment and other fields.
8. Things to note and common misunderstandingsPay attention to the order of numbers when identifying to avoid confusing the multiplier digits.
Some chip resistors may use letters instead of multipliers, which need to be confirmed with the manufacturer's manual.
The resistance unit defaults to ohms, and the markings of different manufacturers may be slightly different.
The four-digit chip resistor resistance expression accurately expresses the resistance value by adding the first three significant digits and a multiplier, which meets the needs of high-precision electronic components. Understanding its coding rules and applications will help engineers and technicians correctly select and use chip resistors to improve the performance and reliability of electronic products. During the purchase and use process, specific specifications should be combined to avoid misreading and ensure the accuracy of circuit design.
