PWRA247 PWRA247 Wirewound Resistors

PWRA247 is a high-performance wirewound resistor from the renowned manufacturer Bourns, a global leader in sensing, protection, and control solutions. This component falls under the category of Passive Components, specifically Wirewound Resistors. Wirewound resistors are a type of passive electronic component that limits or restricts the flow of electric current in a circuit. They are constructed by winding a metal wire, usually an alloy such as Nichrome, around a non-conductive core. This construction provides excellent stability, high power dissipation capabilities, and precise resistance values, making them suitable for demanding applications where reliability and accuracy are paramount.

Key Specifications

The Tolerances offered for the PWRA247 range from 0.5 %, 1 %, to 5 %. Tolerance indicates the permissible deviation of the actual resistance value from its nominal value. A lower tolerance percentage signifies higher precision, which is critical in applications where exact resistance is required to maintain circuit performance and accuracy, such as in measurement equipment or precision control systems.

With a Power (Watts) rating of 7 W, the PWRA247 can safely dissipate up to 7 watts of power without overheating or failing. This high power rating makes it suitable for applications that involve significant current flow or require robust power handling capabilities, such as power supplies, motor control circuits, and industrial equipment.

The Component Type is Wirewound Resistors, which are known for their superior stability, low noise, and ability to withstand high temperatures and power loads compared to other resistor types like carbon film or metal film resistors. This makes them ideal for environments where reliability under stress is crucial.

The Resistance Range for this series extends from 0.05 to 50K Ω. This broad range allows designers to select the exact resistance value needed for a wide variety of circuit designs, from very low resistance current sensing applications to higher resistance voltage division or signal conditioning tasks.

Its Profile/Package Style is Surface Mount Wirewound. Surface mount technology (SMT) allows for automated assembly, reducing manufacturing costs and increasing production efficiency. The compact surface mount package also enables higher component density on printed circuit boards (PCBs), making it suitable for miniaturized electronic devices while still offering the robust performance of wirewound technology.

The Temperature Coefficient ranges from ±20 PPM/°C to ±300 PPM/°C. The temperature coefficient of resistance (TCR) indicates how much the resistance value changes with temperature variations. A lower PPM/°C value signifies greater stability of the resistance over a wide operating temperature range, which is vital for applications requiring consistent performance in varying thermal environments, such as automotive electronics or outdoor industrial controls.

Features and Benefits

• High Power Dissipation: The 7W power rating ensures robust performance in high-current applications, preventing component failure due to overheating.
• Excellent Stability and Precision: Wirewound construction combined with low tolerance options (down to 0.5%) provides highly accurate and stable resistance values over time and varying conditions.
• Wide Resistance Range: Offers flexibility for designers with a broad spectrum of resistance values from 0.05 Ω to 50K Ω, catering to diverse circuit requirements.
• Surface Mount Design: Facilitates automated assembly processes, leading to cost-effective manufacturing and efficient use of PCB space in modern electronic designs.
• Reliable Performance Across Temperatures: A controlled temperature coefficient ensures consistent electrical characteristics even under fluctuating thermal conditions, enhancing overall system reliability.

Typical Applications

The PWRA247 wirewound resistors are highly versatile and find use in numerous demanding electronic applications. In power supply units, they are often employed as current limiting resistors or in snubber circuits to dissipate excess energy and protect other components. Their high power rating is particularly beneficial here. For motor control circuits, these resistors can be used for current sensing or braking applications, where their stability and ability to handle transient loads are critical for precise motor operation and protection. In industrial automation equipment, the PWRA247 can be integrated into control panels and sensor interfaces, providing reliable signal conditioning and protection in harsh operating environments. Furthermore, in test and measurement instruments, their high precision and low temperature coefficient make them ideal for calibration circuits and accurate current/voltage division, ensuring the integrity of measurement results. Lastly, in automotive electronics, these resistors are suitable for various modules, including engine control units and infotainment systems, where components must withstand wide temperature swings and vibration while maintaining performance.

This Bourns PWRA247 wirewound resistor is a testament to quality and engineering excellence, designed to meet the rigorous demands of modern electronics. It is stocked and shipped across India by Cirkit Electro Components, Mumbai, ensuring prompt availability for your projects.

Browse more Wirewound Resistors at Cirkit Electro Components.

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