PF2472 PF2472 High Power Resistors

PF2472 is a series of high-power resistors manufactured by Bourns, a global leader in sensing, protection, and control solutions. These resistors are specifically designed to dissipate significant amounts of power, making them indispensable in applications where robust and reliable current limiting or voltage division is required. As a critical passive component, the PF2472 series utilizes advanced thick film technology to achieve its impressive power handling capabilities within a compact TO-247 package, suitable for through-hole mounting. This series is engineered for demanding industrial, automotive, and power electronics environments where thermal management and long-term stability are paramount.

Key Specifications

The Package for the PF2472 series is TO-247. This industry-standard package is well-known for its excellent thermal performance, often used for power semiconductors and power resistors due to its ability to facilitate efficient heat transfer to a heatsink. Its larger size compared to smaller surface-mount packages allows for higher power dissipation and robust mechanical mounting.

The Material used is Thick Film. Thick film technology involves printing a resistive paste onto a ceramic substrate, which is then fired at high temperatures. This method is cost-effective for producing resistors with moderate to high power ratings and good stability, offering a balance between performance and manufacturing efficiency.

Tolerances available are 1 % and 5 %. Resistance tolerance indicates the permissible deviation from the nominal resistance value. A 1% tolerance is considered precision-grade, suitable for applications where accurate resistance values are critical, such as in measurement circuits or precision power supplies. A 5% tolerance is more common for general-purpose power applications where slight variations do not significantly impact circuit performance.

The Component Type is High Power Resistors. This classification signifies that these resistors are specifically engineered to handle and dissipate substantial amounts of electrical power, typically exceeding a few watts. They are constructed with materials and designs that can withstand high temperatures and thermal stress without significant degradation in performance or reliability.

Power per Resistor is 100 W. This attribute is a critical indicator of the maximum continuous power that a single PF2472 resistor can dissipate without exceeding its maximum operating temperature. A 100W rating makes these resistors suitable for very demanding applications, requiring careful thermal management, often involving mounting on a heatsink.

The Physical Configuration is Through-hole. Through-hole components have leads that are inserted into holes drilled in printed circuit boards (PCBs) and then soldered on the opposite side. This configuration provides a strong mechanical connection, making it ideal for components that may experience physical stress or require robust mounting, especially in high-power applications where heat sinking is often necessary.

The Resistance Range (Ohms) is 0.1-20K. This wide range allows designers to select the precise resistance value needed for various applications, from very low ohmic values used for current sensing or discharge circuits to higher values for voltage division or load applications. The availability of both low and high resistance values enhances the versatility of the PF2472 series.

The Temperature Coefficient is ±200 / ±300 ppm/°C. The temperature coefficient of resistance (TCR) describes how much the resistance value changes per degree Celsius change in temperature. A TCR of ±200 ppm/°C or ±300 ppm/°C indicates good stability over varying operating temperatures, which is important for maintaining consistent circuit performance in environments with fluctuating thermal conditions.

Features and Benefits

• Exceptional Power Handling: With a 100W power rating, these resistors are designed for robust performance in high-power circuits, ensuring reliability and longevity even under significant electrical loads.
• Thermal Efficiency: The TO-247 package is optimized for superior thermal dissipation, allowing for effective heat transfer to a heatsink, which is crucial for maintaining operational stability and extending component lifespan.
• Broad Resistance Range: Offering a resistance range from 0.1 Ohms to 20 KOhms, the PF2472 series provides flexibility for a diverse array of circuit designs, from current limiting to voltage regulation.
• Reliable Thick Film Technology: Utilizes proven thick film material for consistent performance, good stability, and cost-effectiveness in high-volume applications.
• Precision and Standard Tolerances: Available in 1% and 5% tolerances, catering to both precision-sensitive applications and general-purpose power designs, offering design flexibility without compromising quality.
• Robust Through-hole Mounting: The through-hole configuration ensures a strong mechanical connection to the PCB, enhancing durability and making it suitable for applications subject to vibration or physical stress.

Typical Applications

• Power Supplies and Converters: Used as snubber resistors, current-limiting resistors, or discharge resistors in AC/DC and DC/DC power converters, ensuring stable operation and protection against transient voltages. Their high power rating makes them ideal for handling surge currents and dissipating energy efficiently.
• Motor Drives and Industrial Controls: Employed in braking circuits for electric motors, where they dissipate regenerative energy during deceleration, preventing overvoltage conditions and protecting the drive electronics. They also find use in current sensing and control loops within industrial automation systems.
• Renewable Energy Systems: Critical components in solar inverters and wind turbine converters for managing power flow, protecting circuits from overcurrents, and ensuring efficient energy conversion. Their ability to handle high power makes them suitable for the demanding environments of renewable energy.
• Test and Measurement Equipment: Utilized in high-power load banks, electronic loads, and precision test equipment where accurate and stable resistance values are required to dissipate significant power during testing procedures.
• Automotive Electronics: Integrated into electric vehicle (EV) charging systems, battery management systems (BMS), and power steering units, where they manage high currents and dissipate heat effectively, contributing to the safety and performance of automotive power electronics.

The Bourns PF2472 series offers a reliable and high-performance solution for demanding power applications. These resistors combine robust construction with excellent thermal characteristics, making them an ideal choice for engineers seeking dependable components. The PF2472 is stocked and shipped across India by Cirkit Electro Components, Mumbai, ensuring prompt availability for your projects.

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