Chip Resistor – Surface Mount
1. What are Surface Mount Chip Resistors?
A surface mount chip resistor is a resistive component mounted on a circuit board using surface mount technology (SMT).
2. What are the Core Characteristics of Surface Mount Chip Resistors?
Structure: Typically composed of a ceramic substrate, a metal resistive film, internal electrodes, and solder terminals. Some models utilize thick-film (metal oxide mixed layer) or thin-film technology.
Size Advantage: Compact (e.g., rectangular package), suitable for high-density circuit designs.
Performance Characteristics: High precision (selectable from ±1% to ±0.1%), low temperature coefficient (excellent temperature stability), and high-temperature resistance (some models support operating temperatures exceeding 200°C).
3. What are the Working Principles of Surface Mount Chip Resistors?
Based on Ohm’s law (R=V/I), voltage/current regulation is achieved through the resistance of the resistive film to current flow. Some specialized types, such as fuse resistors, use a low-melting-point material to interrupt the circuit in the event of an overcurrent.
4. What are the Applications of Surface Mount Chip Resistors?
Consumer Electronics: Signal processing and circuit protection in micro-devices such as mobile phones and tablets.
Automotive Electronics: High-temperature, high-reliability applications such as engine control and power management.
Industrial Equipment: Used in precision control circuits for current sensing and signal attenuation.
5. Manufacturing Process of Surface Mount Chip Resistors
The following technologies are primarily used:
Thick-film Process: Metal oxide slurry is printed on a ceramic substrate, and laser trimming is used to achieve precise resistance values.
Thin-film Process: Vacuum-deposited metal thin film offers higher precision but higher costs.
Protective Layer: Epoxy resin or ceramic coating enhances mechanical strength and environmental resistance.
6. Selection Considerations for Surface Mount Chip Resistors
Resistance accuracy, power rating (e.g., 0201 package is typically 1/20W), voltage rating, and operating temperature range should be considered comprehensively.