Product Overview
The UNI-ROYAL MF Series Precision Metal Film Fixed Resistors are manufactured with a nichrome resistive element for stable performance in various environments. They offer low noise, low voltage coefficient, and a low temperature coefficient range. The resistors feature multiple epoxy coatings for superior moisture protection and are compliant with RoHS and halogen-free requirements. Available in flame retardant types.
Product Attributes
- Brand: UNI-ROYAL
- Origin: China
- Material: Nichrome resistive element, Cold steel plated with copper/tin end caps, Tin solder coated copper wire leads, Ceramic basic body.
- Coating Color: Blue (standard), Deep Green (1/2WS), Apple Green (0.6WS)
- Certifications: RoHS compliant, Halogen free
Technical Specifications
| Model | Power Rating | Tolerance | Resistance Range | Max Working Voltage (V DC/AC) | Max Overload Voltage (V DC/AC) | Dielectric Withstanding Voltage (V DC/AC) |
| MF 1/8W | 1/8W | 1% | 10~1M | 28 | 52 | 200 |
| MF 1/4WS | 1/4W (Small Size) | 1% | 10~1M | 28 | 52 | 200 |
| MF 0.4WSS | 0.4W (Extra Small Size) | 1% | 10~1M | 28 | 52 | 200 |
| MF 1/4W | 1/4W | 1% | 10~1M | 28 | 52 | 250 |
| MF 1/2WS | 1/2W (Small Size) | 1% | 10~1M | 28 | 52 | 250 |
| MF 1/2W | 1/2W | 1% | 10~1M | 28 | 52 | 350 |
| MF 0.6WS | 0.6W (Small Size) | 1% | 10~1M | 28 | 52 | 250 |
| MF 1WS | 1W (Small Size) | 1% | 10~1M | 28 | 52 | 350 |
| MF 1W | 1W | 1% | 51.1~1M | 25 | 52 | 500 |
| MF 2WS | 2W (Small Size) | 1% | 51.1~1M | 25 | 52 | 500 |
| MF 2W | 2W | 1% | 51.1~1M | 28 | 64 | 500 |
| MF 3WS | 3W (Small Size) | 1% | 51.1~1M | 28 | 64 | 500 |
| MF 3W | 3W | 1% | 51.1~1M | 28 | 64 | 500 |
Performance Specification
| Characteristic | Limits | Test Method |
| Temperature Coefficient | Refer to TCR PPM/ in Resistance Range section | GB/T5729&JIS-C-5201&IEC60115-1 |
| Short-time overload | R/R (0.5%+0.05 ) | Permanent resistance change after the application of a potential of 2.5 times RCWV or Max.Overload Votage whichever less for 5 seconds. |
| Dielectric withstanding voltage | No evidence of flashover mechanical damage, arcing or insulation break down. | Resistors shall be clamped in the trough of a 90metallic v-block and shall be tested at ac potential respectively specified in the above list for 60-70 seconds. |
| Pulse overload | R/R (1%+0.05) | Resistance change after 10,000 cycles (1 second ON , 25 seconds OFF ) at 4 times RCWV of RCWV or Max.Overload whichever less. |
| Resistance to soldering heat | R/R (1%+0.05 ) | Permanent resistance change when leads immersed to a point 2.0- 2.5mm from the body in 2605 solder for 101 seconds. |
| Resistance to solvent | No deterioration of protective coatings & markings | Sp |
2508141745_UNI-ROYAL-MF006FF6803A50_C18724291.pdf
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