This document describes the features of General Purpose Wirewound Resistors SPP Series produced by Welwyn Components. These resistors have a resistance range of 0R1 to 2K4 ohms and positive high temperature coefficients are available upon request. The resistors have weldable and solderable magnetic leads. The document also provides information on dimensions, electrical data, and physical data for different models.
The SPP Series of general‑purpose wirewound resistors from Welwyn Components covers resistance values from 1 Ω up to 2.4 kΩ, with standard tolerances of 5 % or 10 %. They are offered with magnetic leads that can be welded or soldered, and higher temperature‑coefficient (TC) versions are available on request.
The document lists detailed electrical and physical data, performance characteristics such as temperature coefficient and moisture resistance, and describes packaging options (taped and reeled reels of 4 000 pieces or bulk packs). Test methods follow the EIA RS‑344 specification and power‑derating curves are provided.
| Resistance range | 1 Ω – 2.4 kΩ |
|---|---|
| Standard tolerance | 5 % or 10 % |
| Power rating | 0.5 W @ 125 °C, 1 W @ 190 °C |
| Min. insulation resistance (dry) | 10 000 MΩ |
| Min. insulation resistance (wet) | 100 MΩ |
| Min. dielectric withstanding voltage | 600 V RMS |
| Temperature coefficient | +600 °C 0.109‑0.910 |
| Moisture resistance | +5 % |
| Solderability | 95 % minimum coverage |
The SPP Series offers resistors from 1 Ω up to 2.4 kΩ.
They are supplied with either 5 % or 10 % tolerance.
Resistors are supplied taped and reeled, 4 000 pieces per reel, with bulk packs also available.
They are rated at 0.5 W at 125 °C and 1 W at 190 °C.