The SPP series is a general purpose wirewound resistor produced by Welwyn Electric. It has a resistance range of 0R1 to 2K4 ohms and a rated power of 0.75 watts. The maximum working voltage is √PR.
This datasheet describes the SPP Series general‑purpose wirewound resistors offered by Welwyn Components, a subsidiary of TT Electronics. It lists the resistance ranges, tolerances, power ratings, temperature coefficients and other key electrical parameters.
Physical dimensions, packaging options, and application notes such as fuse/pulse behavior and solderability are also included, along with test methods and derating curves for various ambient temperatures.
| Standard tolerance | ±5 % or ±10 % |
|---|---|
| Power rating at 125 °C | 0.5 W |
| Min. insulation resistance (dry) | 10 000 MΩ |
| Min. insulation resistance (wet) | 100 MΩ |
| Dielectric Withstanding Voltage | 600 V RMS |
| Temperature coefficient | +600 ppm/°C (0.109‑0.910) |
| Thermal shock | 45 % |
| Solderability | ≥95 % coverage |
| Moisture resistance | +5 % |
| Life test | 45 % |
| Packaging | taped and reeled, 4 000 pcs/reel |
They are rated for 0.5 W at 125 °C.
The minimum insulation resistance when dry is 10 000 MΩ.
They are supplied taped and reeled, with 4 000 pieces per reel, and bulk packs are also available.