A homogeneous film of metal alloy is deposited on a high grade ceramic body. After a helical groove has been cut in the resistive layer, tinned connecting leads of electrolytic copper are welded to the end-caps.
The resistors are coated light-green for type SFR25 which provides electrical, mechanical, and climatic protection. The encapsulation is resistant to all cleaning solvents in accordance with IEC 60068-2-45.
Small size (SFR25: 0204)
Low noise (max. 1.5 μV/V for R > 1 MΩ)
Compatible to both lead (Pb)-free and lead containing soldering processes