Executive Summary
Precision Holco Metal Film Resistors are designed for applications requiring high accuracy and stability. Manufactured by MEC Electronics (Mec Git) in Devon, England, these resistors are tailored for both industrial and military applications. They notably maintain tight tolerances ranging from 1% to an extremely precise 0.05%, alongside low temperature coefficients of resistance (TCRs) from 100 ppm/°C to exceptionally stable 5 ppm/°C.
Performance and Specifications
The Holco series boast a comprehensive approval to standards such as BS CECC 40 101-004 and BS EN 9111-NOOT, ensuring a strong market trust in their quality. Specific types like H8 resistors are available in E96 values with tolerances of 0.5% and 0.1% and a TCR of 50ppm, clear indicators of the product’s focus on precision. These resistors are capable of managing power across four case sizes, from 0.063W to 1W, with operational voltages up to 350V (limiting element voltage).
Product Range and Customization
Holco offers resistors across a wide ohmic range from 1R to 10M, ensuring compatibility with various applications. Moreover, the resistors can be customized to meet specific customer needs, highlighting MEC’s commitment to flexible supply in both standard and bespoke configurations.
Ratings and Temperature Resistance
The datasheet details resistor types H2, H4, H8, and H10 with distinctions in their power rating at 70°C, temperature rise, and their corresponding voltages. In addition to 70°C power ratings, the datasheet also provides information for a 125°C temperature scenario, showcasing the adaptability of these components to different thermal conditions.
Commercial and Custom Ranges
Holco resistors come in five tolerance categories and a commercial range designed to withstand temperatures of up to 70°C. They are available in 0.1W, 0.25W, 0.5W, and 1W power ratings with maximum working voltages from 200V to 350V. The TCR for this range varies from 100 ppm/°C to an ultra-stable 0.05%, highlighting the brand’s emphasis on providing components that suit various precision requirements.
Mechanical Data and Customization Options
The mechanical characteristics, including dimensions and lead specifications of the Holco resistors, conform to the IEC 294 standard. Type H4 also comes with an alternate lead diameter option, listed as Type H4T. The datasheet cautions on the necessary support for leads during bending to avoid damage, underlining the need for careful handling during installation.
Concluding Remarks
MEC Holsworthy’s meticulously designed Metal Film Resistors embody a distinct blend of performance, precision, and durability, tailored to the rigorous demands of industrial and military applications. With the availability of extensive customization and a robust quality approval framework, these resistors stand as a reliable choice for precision circuitry.
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