Construction and Design
- Substrate: Built on a high-grade ceramic core.
- Resistive Layer: Uses a vacuum sputtering system to deposit layers of mixed metal alloys and passivated materials.
- Helical Cut: A spiral groove is cut into the metal layer to fine-tune the resistance value.
- Leads and Caps: Tinned electrolytic copper connecting leads are welded to end-caps.
- Coating: Standard types feature a protective blue lacquer coating, while high-power variants (like the FMP series) use a pink flameproof coating.
Key Features and Specifications
- Power Ratings: Typically range from 1/6W up to 3W (or higher depending on the specific series like FMP).
- Tolerance: Available in tight precision tolerances from ±0.5% to ±5% (commonly ±1%).
- Temperature Coefficient (TCR): Features a very low temperature coefficient for minimal resistance drift across operating temperatures (typically -55°C to +155°C).
- Compliance: RoHS compliant and halogen-free; select series (like MFP or MFH) are AEC-Q200 qualified for automotive use.