SMD Resistors

Characteristics

• Small Size and Light Weight: This enables them to achieve a higher assembly density in electronic devices with limited space. It helps to reduce the size and weight of products and is thus extensively used in portable devices such as smartphones and tablets.
• Moisture - Resistant and High - Temperature Resistant: They have good environmental adaptability and can work stably under relatively harsh environmental conditions, ensuring the reliability of electronic devices in different environments.
• High Mechanical Strength and Superior High - Frequency Characteristics: They perform well in circuits with high requirements for mechanical stability and high - frequency performance. For example, they are used in the radio - frequency circuits of communication base stations.
• Stable Electrical Performance and High Reliability: They can provide a stable resistance value, ensuring the normal operation of the circuit and reducing the probability of circuit failure. They are often used in medical equipment and aerospace electronic equipment that require high stability.
• Low Assembly Cost: They are suitable for automated production and can be quickly and efficiently mounted by automatic placement machines. This improves production efficiency and reduces labor costs and is widely used in the manufacturing of electronic products of various scales.

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  Classification

  
  
  • By Production Process
    • Thick - Film: The resistive material is deposited on an insulating substrate by screen - printing and then sintered. The accuracy range of common thick - film chip resistors is between ±0.5% and 10%, and the temperature coefficient is between ±50ppm/℃ and ±400ppm/℃.
    • Thin - Film: The resistive material is deposited on an insulating substrate in a vacuum using evaporation and sputtering processes. It has the characteristics of a low - temperature coefficient (±5ppm/℃) and high accuracy (±0.01% to ±1%).
  • By Material
    • Metal Resistor: Known for its high precision and low - temperature coefficient, it is suitable for applications with high - precision requirements, such as precision - measuring instruments.
    • Carbon - Film Resistor: Performs well in high - temperature and high - frequency environments and is often used in circuits in special environments.
    • Metal - Oxide Resistor: It has high stability and good high - temperature resistance and is suitable for circuits with high - stability requirements.
  • By Accuracy
    • The accuracy can be divided into several grades such as ±0.01%, ±0.1%, ±1%, ±5% and ±10%. High - precision resistors are often used in precision measurement, medical equipment and other fields, while ordinary - precision resistors are widely used in general consumer electronic products.
  • By Resistance Value
    • High - Resistance Resistor: The resistance value is more than 1 mega - ohm (MΩ) and is mainly used in instruments and some industrial equipment.
    • Low - Resistance Resistor: Generally less than 1 ohm (Ω), mainly used for current detection and voltage detection.