Overview
The Holr0805-1/2W-5MR-1%-15PPM is a surface-mount resistor designed for precision applications. The designation breaks down as follows: 0805 indicates the package size (0.08" × 0.05"), 1/2W specifies the power rating, 5MR denotes the resistance value (likely 5 milliohms or 5 megaohms depending on context), 1% indicates tolerance, and 15PPM shows the temperature coefficient. These resistors are commonly used in applications requiring stable resistance values over temperature variations. They are particularly valuable in measurement equipment, medical devices, and industrial control systems where precision is critical.
Structure and Working Principle
The resistor typically consists of a ceramic substrate with a resistive element made from metal film or thick film material. The 0805 package uses standard surface-mount technology (SMT) with termination materials designed for reliable soldering. The resistive element's composition determines the temperature coefficient and stability characteristics. In operation, the resistor follows Ohm's Law (V=IR), providing a precise resistance value between its terminals. The 15ppm/°C temperature coefficient means the resistance value changes by no more than 15 parts per million for each degree Celsius of temperature change, ensuring stable performance across operating conditions.
Key Features
The 1% tolerance rating indicates high precision, making this resistor suitable for applications where circuit performance depends on accurate resistance values. The 15ppm/°C temperature coefficient provides excellent stability across temperature ranges, reducing measurement errors in sensitive equipment. The 0805 package size offers a good balance between space efficiency and ease of handling during assembly. With a 0.5W power rating, this resistor can handle moderate power levels while maintaining its precision characteristics. These features combine to make it a reliable choice for demanding electronic applications.
Application Areas
Precision measurement equipment often uses these resistors in signal conditioning circuits and reference voltage networks. Medical devices benefit from their stability in critical monitoring and diagnostic equipment. Industrial control systems employ them in process measurement and control circuits where reliability is essential. Telecommunications equipment utilizes these resistors in filtering and impedance matching applications. Automotive electronics, particularly in sensor interfaces and engine control units, may specify these resistors for their temperature stability. Test and measurement instrumentation represents another significant application area where precision resistors are mandatory.
Maintenance and Precautions
When handling these resistors, observe standard ESD precautions to prevent damage to the sensitive components. Avoid mechanical stress during assembly as the ceramic substrate can be brittle. Ensure proper soldering profiles are followed to prevent thermal shock or damage to the resistive element. In operation, maintain power dissipation below the rated 0.5W to prevent overheating and resistance drift. For long-term storage, keep components in their original packaging in a controlled environment (typically <40°C and <60% relative humidity). Regularly inspect solder joints in critical applications as connection reliability affects overall circuit performance.
B2B Procurement Guide
When sourcing Holr0805-1/2W-5MR-1%-15PPM resistors, verify manufacturer certifications (ISO 9001, IATF 16949 for automotive) and request detailed specifications. Consider minimum order quantities (MOQs) which typically range from 1,000 to 10,000 units for standard pricing. Evaluate supplier lead times (commonly 4-12 weeks) and consider maintaining buffer stock for critical applications. Request samples for verification testing before large orders. For custom requirements (special marking, packaging, or testing), discuss options with manufacturers early in the procurement process. Compare pricing from multiple authorized distributors for best commercial terms.