What are the important performance parameters of chip resistors
What are the important performance parameters of chip resistors? Chip resistors are one of the important electronic components of electronic products. According to the circuit requirements of the products, the selection parameters of chip resistors are also different. What are the important performance parameters of chip resistors when selecting chip resistors?
1. Nominal resistance: the resistance indicated on the resistor.
2. Promise error: The percentage of the difference between the nominal resistance value and the actual resistance value and the ratio of the nominal resistance value is called the resistance value error, which indicates the accuracy of the resistor.
The corresponding relationship between the error and the accuracy is as follows: ±0.5%-0.05, ±1%-0.1 (or 00), ±2%-0.2 (or 0), ±5%-Ⅰ, ±10%- Ⅱ、±20%-Ⅲ
3. Rated power: Under the conditions of normal atmospheric pressure of 90-106.6KPa and ambient temperature of -55°C to +70°C, the long-term operation of the resistor is allowed to dissipate the high power.
The rated power series of wirewound resistors are (W): 1/20, 1/8, 1/4, 1/2, 1, 2, 4, 8, 10, 16, 25, 40, 50, 75, 100, 150, 250, 500
Rated power series of non-wirewound resistors are (W): 1/20, 1/8, 1/4, 1/2, 1, 2, 5, 10, 25, 50, 100
4. Rated voltage: the voltage converted from the resistance value and the rated power.
5. High operating voltage: the maximum continuous operating voltage allowed. When working with low air pressure, the high working voltage is lower.
6. Temperature coefficient: the relative change of the resistance value caused by the temperature changing by 1℃. The smaller the temperature coefficient, the better the stability of the resistance. The resistance value increases with the increase of temperature is a positive temperature coefficient, and vice versa is a negative temperature coefficient.
7. Aging coefficient: the percentage of the relative change of the resistance value of the resistor under the rated power for a long time, which is a parameter indicating the length of the resistor's life.
8. Voltage coefficient: within the specified voltage range, the relative change of the resistor for every 1 volt change in the voltage.
9. Noise: an irregular voltage fluctuation generated in the resistor, including thermal noise and current noise. Thermal noise is due to the free movement of electrons inside the conductor, which makes any two The voltage of the point changes irregularly.