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A summary of comprehensive knowledge of precision resistor?

Source: Company Dynamics Editor: PingShang Click: Release time: 2021-03-25 09:24:05

1. For precision sampling resistor with resistance values ??ranging from 1 milliohm to 1 ohm, precision foil resistor are usually used.

Because only the resistance of alloy materials can remain stable under the condition of low resistance and high current, the temperature drift can be as low as ±5ppm/°C, and the accuracy can be as low as ±0.1% or even higher. Precise current sampling resistor can replace Hall electric .

Flow sensors also have cost advantages. More power space can be reserved, which is also conducive to reducing the temperature of the resistor surface and improving the stability of the sampling resistor. And its main function is current detection, and the four-leg structure is convenient for precision

Confidential sampling.

2. Resistance from 1 ohm to 10 ohm is a difficult point for any resistance technology.

In this low resistance range, only thick resistive materials and short current paths can achieve low resistance. Thick resistance material is not conducive to the combination with the substrate to balance the temperature drift, and the short current path is not conducive to precise resistance adjustment. Precision

The temperature drift of wire-wound resistor is entirely based on the resistance alloy wire itself, which can achieve about ±10ppm/°C, but wire-wound resistor generally only have pins and have inductance. The temperature drift of precision foil resistor can be controlled within this resistance range

Within ±5ppm/°C, the accuracy can be ±0.1% or better, and both patches and pins can be provided.

3. The resistance range exceeding 150K-1M belongs to the middle resistance range.

Use precision thin film resistor. For temperature drift requirements below ±2ppm/°C, pin-precision foil resistor are usually used, but the higher the resistance, the higher the price of such resistor, because multiple resistor SMD are required to achieve the required resistance

. The precision wire-wound resistor of the pins can also meet the high accuracy and temperature drift as low as ±2ppm/°C, but the price has no advantage. Some pin thin film resistor can provide temperature drift as low as ±5ppm/°C, but the long-term stability is worse than precision

Dense foil resistance.

4. 10 ohm-150K ohm is the conventional resistance range

Based on different precision requirements in this resistance range, precision foil resistor can be selected under the requirements of less than ±2ppm/°C or high requirements for long-term stability. Both patches and pins can be selected. Wen Piao asked

About ±5ppm/°C, thin film resistor or metal film resistor can be used where long-term stability requirements are not so high.

5. 1M-10T high-voltage precision resistance needs to choose precision thick-film high-voltage resistance

Working under high pressure and providing high resistance values ??can only be achieved by thick film technology. Important technical indicators include (long-term stability, noise, temperature drift, voltage coefficient, voltage stability and accuracy) and so on. Especially the voltage coefficient and voltage stability

The index of is very important, and other applications require low-noise high-voltage resistor. Noise exists in the defect parts of the resistive film. The more defects, the greater the noise. Special thick film technology can help improve this problem.

6. 1M-50M is a high resistance section for precision resistor

The highest resistance value supported by precision thin film resistor is 10M, (the best temperature drift is ±5ppm/°C, the highest accuracy is ±0.01%), precision thick film resistor can provide precision and temperature drift similar to thin film resistor, but can support the entire Area

The resistance value between. In addition, wire wound resistor, a single resistor can provide a resistance value of up to 50M, a temperature drift as low as ±2ppm/°C and an accuracy of up to ±0.001%, especially in terms of long-term stability, which is much better than thin-film and thick-film resistor.

Resistance technology. The maximum resistance that a single precision foil resistor can currently support is 2M, and it is expensive.


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