Metal-Film Precision Resistors (MF)
(MF) Precision Resistors Introduction
Precision metal-film resistors for low-cost uses
Token offers a low-cost alternative commercial metal film resistor for precision applications. The MF series offers tight tolerances and low TCRs over a wide resistance range and are suitable for applications where long-term stability is paramount.
The MF is available in a resistance range of 10Ω to 1MΩ with a standard resistance tolerance of ±1% and a temperature coefficient of resistance (TCR) of +15/-25ppm/°C, although other tolerances and TCRs are available.
The resistance element in these devices is a precisely controlled thin film of metal alloy deposited on a high quality alumina rod. Plated caps are force-fitted before the assembly is trimmed using advanced trimming techniques to ensure excellent performance and low electrical noise.
Leads are welded to the end caps prior to the resistor being coated with epoxy, and colour band marking applied. A variety of standard lead forms are available for use where auto-insertion is not available or practical. This gives the advantage of the value being shown, even if the resistor is machine preformed or auto-inserted.
The MF is RoHS compliant with 100% lead free, Contact us with your specific needs.
Download complete specification - Precision Metal-Film Resistors (MF).
- RoHS compliant.
- Pure tin plating provides compatibility with lead (Pb)-free.
- Low cost, low noise, operating temperature range -55°C ~ 155°C
- Precision tighted tolerance available in ±0.1%, ±0.25%, ±0.5%, ±1%
- Telecom, Test and measurement, All general purpose applications
(MF)Dimensions & Specifications (Unit: mm)
Metal Film Precision Resistors (MF) Dimensions (Unit: mm) |
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| STYLE | MIL STYLE | POWER RATING (W) | DIMENSION (mm) | MAX WORKING VOLTAGE | MAX OVERLOAD VOLTAGE | ||||||
| RN | RNS | L | D | H | d ± 0.05 | RN | RNS | RN | RNS | ||
| MF - 12 | RN-50 | 1/8W | 1/4W | 3.2± 0.2 | 1.5 ± 0.2 | 26 ± 1.0 | 0.40~0.45 | 200 | 150 | 400 | 300 |
| MF - 25 | RN-55 | 1/4W | 1/2W | 6.0 ± 0.3 | 2.3 ± 0.3 | 26 ± 1.0 | 0.40~0.50 | 250 | 200 | 500 | 400 |
| MF - 50 | RN-60 | 1/2W | 1W | 9.0 ± 0.5 | 3.0 ± 0.5 | 26 ± 1.0 | 0.50~0.55 | 350 | 250 | 700 | 500 |
| MF - 100 | RN-65 | 1W | 2W | 11 ± 1.0 | 4.0 ± 0.5 | 35 ± 3.0 | 0.75~0.80 | 500 | 300 | 1000 | 600 |
| MF - 200 | RN-70 | 2W | 3W | 15 ± 1.0 | 5.0 ± 0.5 | 35 ± 3.0 | 0.75~0.80 | 500 | 350 | 1000 | 700 |
(MF) Resistance Range
| STYLE | MIL STYLE | TOLERANCE | TC+15-25PPM | TC+50PPM | TC+100PPM |
| MF-12 | RN-50 | ±1% ±0.5% ±0.25% |
100Ω-100KΩ 100Ω-100KΩ 100Ω-100KΩ |
10Ω-1MΩ | 10Ω-1MΩ |
| MF-25 | RN-55 | ±1% ±0.5% ±0.25% ±0.1% |
51.1Ω-511KΩ 51.1Ω-511KΩ 100Ω-300KΩ 100Ω-300KΩ |
10Ω-1MΩ | 10Ω-1MΩ |
| MF-50 | RN-60 | ±1% ±0.5% ±0.25% ±0.1% |
51.1Ω-1KΩ 51.1Ω-1KΩ 100Ω-551KΩ 100Ω-330KΩ |
10Ω-1MΩ | 10Ω-1MΩ |
| MF-100 | RN-65 | ±1% ±0.5% ±0.25% ±0.1% |
51.1Ω-1KΩ 51.1Ω-1KΩ 100Ω-551KΩ 100Ω-330KΩ |
10Ω-1MΩ | 10Ω-1MΩ |
| MF-200 | RN-70 | ±1% ±0.5% ±0.25% ±0.1% |
51.1Ω-1KΩ 51.1Ω-1KΩ 100Ω-551KΩ 100Ω-330KΩ |
10Ω-1MΩ | 10Ω-1MΩ |
| * Standard resistance is 10Ω-1MΩ, below or over this resistance on request. | |||||
(MF) Electrical Performance
| REQUIREMENTS | CHARACTERISTICS | JIS C 5202 | MIL-R-10509F |
| Operating Temp. Range | -55°C ~ 155°C | ||
| Temp Coefficient (°C ) | ±25 ±50 ±100 | 5.2 | 4.6.12 |
| Short Time Overload | ±(0.5%%+0.05Ω) | 5.5 A | 4.6.6 |
| Dielectric Withstanding V | ±(0.5%+0.05Ω) | 5.7 A | 4.6.8 |
| Effect of Soldering | ±(0.5%+0.05Ω) | 6.4 350°C 3 sec | 4.6.10 |
| Temperature Cycling | ±(0.5%+0.05Ω) | 7.4 | 4.6.4 |
| Low Temp Operation | ±(0.5%+0.05Ω) | 4.6.5 | |
| Terminal Strength | ±(0.5%+0.05Ω) | 6.1 | 4.6.7 |
| Moisture Resistance | ±(1%+0.05Ω) | 7.9 1,000hr | MIL R-22684 4.6.10 |
| Load Life | ±(1%+0.05Ω) | 7.10 1,000hr | 4.6.13 |
| Storage | ±(0.2%+0.05Ω) | Shelved one year in a room of normal temperature and humidity | |
(MF) Order Codes
| MF-25 | 1/4W | 100R | F | TB | |||||||||||||||||||||||||||||||||||
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