Thick film patch resistors are one of the most widely used components in electronic circuits. They deposit resistor materials on ceramic substrates through screen printing technology, and have the characteristics of small size, low cost, and high reliability. According to the different design performance and application scenarios, thick film surface mount resistors can be divided into the following six categories, and the characteristics and applications of each category are as follows:
Conventional thick film surface mount resistor
Resistance range: 1 Ω~22M Ω, covering the vast majority of general circuit requirements.
Temperature coefficient (TCR): 100-300 ppm/℃, resistance changes moderately with temperature, suitable for scenarios with low temperature stability requirements.
Rated power: Depending on the size, such as 0603 (1/10W), 0805 (1/8W), 2512 (1W), etc., to meet different power requirements.
Voltage: ≤ 200V, suitable for low-voltage circuits.
Tolerance: ± 5%, ± 1%, meeting conventional accuracy requirements.
Application: General scenarios such as consumer electronics, power modules, and home appliance control boards.
Ultra low resistance thick film surface mount resistor
Resistance range: 10m Ω~1000m Ω, designed specifically for high current circuits.
Temperature coefficient (TCR): ≤ 500 ppm/℃, with high resistance stability, reducing current fluctuations caused by temperature changes.
Rated power: Similar to conventional class, but low resistance allows for larger currents to pass through without overheating easily.
Voltage: ≤ 200V, consistent with conventional class.
Tolerance: ± 5%, ± 1%, to ensure the accuracy of current detection.
Application: Current sampling, power management, motor drive, battery protection board and other scenarios that require high current.
High voltage thick film surface mount resistor
Resistance range: 10K Ω~15M Ω, optimized for high voltage circuits.
Temperature coefficient (TCR): 200 ppm/℃, with good resistance stability and adaptability to temperature changes in high-pressure environments.
Rated power: 200-1000, capable of withstanding power loss under high voltage, such as 200V-1000V.
Voltage: up to several thousand volts, far exceeding conventional levels, suitable for high-voltage power supplies and high-voltage circuits.
Tolerance: ± 5%, ± 1%, meeting the accuracy requirements of high-voltage circuits.
Applications: medical equipment (such as X-ray machines), industrial automation, high-voltage power supplies, power transmission systems, etc.
Precision thick film surface mount resistor
Resistance range: 10 Ω~1M Ω, providing medium precision resistance values.
Temperature coefficient (TCR): ≤ 50 ppm/℃, excellent resistance stability, reducing the impact of temperature on circuit performance.
Rated power: relatively low, such as 0603 (1/5W), suitable for precision low-power circuits.
Voltage: ≤ 200V, consistent with conventional class.
Tolerance: ± 0.5%, ± 0.1%, meeting high-precision circuit requirements, such as instrumentation.
Applications: medical equipment (such as precision monitors), communication equipment (such as base stations), testing and measuring instruments, etc.
High resistance thick film surface mount resistor
Resistance range: 22M Ω~1G Ω, providing extremely high resistance values.
Temperature coefficient (TCR): 500-2000 ppm/℃, resistance varies greatly with temperature, suitable for scenarios where resistance accuracy is not required.
Rated power: Low, due to the low current under high resistance, the power demand is low.
Voltage: ≤ 200V, consistent with conventional class.
Tolerance: ± 5%, ± 10%, suitable for insulation testing, high impedance signal conditioning and other scenarios.
Applications: Insulation testing equipment, sensor interfaces, anti-static circuits, etc.
High power thick film surface mount resistor
Resistance range: 0.1 Ω~22M Ω, covering a wide range of resistance requirements.
Temperature coefficient (TCR): 75-500 ppm/℃, moderate resistance stability, adaptable to power changes.
Rated power: relatively high, such as 0603 (1/5W), 2512 (1.5W), meeting the requirements of high-power circuits.
Voltage: ≤ 200V, consistent with conventional class.
Tolerance: ± 5%, ± 1%, ensuring circuit stability under high power.
Applications: power electronics (such as inverters), industrial control (such as PLCs), automotive electronics (such as ECUs), etc.
Common characteristics of thick film surface mount resistors
Materials and processes: Resistive materials such as ruthenium oxide are deposited on ceramic substrates using screen printing technology, and then sintered at high temperatures. The process is mature and cost-effective.
Size specifications: including standardized sizes such as 0201, 0402, 0603, 0805, 1206, 2512, etc. The larger the size, the higher the rated power.
Environmental adaptability: Compliant with the ROHS directive, some models have passed automotive grade certifications such as AEC-Q200, and possess characteristics such as sulfur resistance, high temperature resistance, and moisture resistance.
Application areas: Widely used in consumer electronics (such as mobile phones and computers), industrial control (such as motor drives), automotive electronics (such as BMS), medical equipment (such as monitors), communication equipment (such as routers), and other fields.
Through the above classification, thick film surface mount resistors can meet the specific requirements of different circuits for resistance, accuracy, power, and voltage. At the same time, with their cost advantages and reliability, they occupy an important position in the electronics industry.