High Precision Metal Film Resistors: Ultimate Accuracy for Critical Circuits

High precision metal film resistors are applicable to fields such as analog signal acquisition and precision instruments and meters.

● Products with military standard certification.
● High stability/high reliability: Molded packaging is adopted.
● High precision: The deviation range of the nominal resistance value is within ±0.01% to ±1.0%.
● Low temperature coefficient: ±2 PPM/°C to ±50 PPM/°C (the test temperature is 25 °C to 85 °C).
● Operating temperature range: -55 °C to +175 °C.

High precision metal film resistors play a crucial role in various electrical circuits, especially those that demand ultimate accuracy. They possess unique characteristics that make them ideal for critical applications.

Features

1. High Precision: High precision metal film resistors typically have a tolerance in resistance values ranging from 0.1% to 1%. In contrast, ordinary metal film resistors generally have a precision level between 1% and 5%. This enables them to offer more accurate resistance values in precision measurement and adjustment circuits, thus ensuring the accuracy and stability of the circuits.

2. Low Temperature Drift: They exhibit a low temperature coefficient, meaning that the change in resistance value with temperature variation is relatively small. It usually ranges from ±2 ppm/°C to ±25 ppm/°C. In temperature-sensitive applications such as precision instruments and meters, they can maintain a stable resistance output and reduce the impact of temperature on circuit performance.

3. Good Stability: These resistors have excellent long-term stability. Their resistance values are less likely to change after long periods of use, allowing them to maintain an accurate and reliable working state. They can adapt to various harsh environmental conditions, with an operating temperature range from -55 °C to +155 °C.

4. Low Noise: In some circuits that have high requirements for noise, like audio, video, and image signal processing circuits, high precision metal film resistors can provide a low-noise resistance output, guaranteeing the normal operation of the circuits and helping to improve the quality and stability of signals.

Manufacturing Process

The manufacturing process of high precision metal film resistors is rather complex and usually involves the following key steps:

1. Depositing Insulating Layer: An insulating layer is formed on a ceramic or glass substrate to provide electrical insulation and protection.

2. Depositing Metal Film: Through vacuum deposition techniques such as thermal evaporation, sputtering or electroplating, a metal thin film is deposited on the insulating layer. Commonly used metal materials include nickel-chromium alloys. By controlling the thickness and width of the metal film, the resistance value can be adjusted.

3. Cutting and Shaping: The metal thin film is cut and processed to form resistors with the required shape and specifications.

4. Testing and Grading: The manufactured resistors undergo strict testing and grading to ensure that parameters such as resistance values and temperature coefficients meet the high-precision requirements.

Application Areas

1. Electronic Measuring Instruments: Instruments like oscilloscopes and multimeters require high precision resistors to ensure the accuracy and reliability of measurements.

2. Communication Equipment: In base stations, mobile phones and other communication equipment, they are used in signal processing, power control and other circuits to guarantee the quality and stability of communication signals.

3. Aviation and Aerospace: Aviation and aerospace equipment have extremely high requirements for the precision and reliability of electronic components. High precision metal film resistors can be applied in flight control systems, navigation systems and other critical circuits to ensure the safe and reliable operation of the equipment.

4. Military Equipment: For example, in radar, missile guidance systems, etc., high precision resistors are needed to achieve precise signal processing and control.

5. Medical Equipment: In medical imaging equipment, vital signs monitors and so on, there are relatively high requirements for the precision and stability of resistors to ensure the normal operation of the equipment and the accuracy of measurement results.

6. Automotive Electronics: In key electronic components of automobiles such as engine control units, electronic stability programs, and autonomous driving systems, high precision metal film resistors play an important role in ensuring the performance and safety of automobiles.