MMFR Precision Metal Film Molded Resistor
The MMFR series is a precision metal film molded resistor designed for high-end manufacturing and precision instrumentation applications. It offers tight tolerance, low TCR, and high load life stability, utilizing 95% alumina ceramic cores and precision metal film deposition technology. Laser trimming achieves target resistance, with the lowest TCR at 10ppm/. Load life stability is significantly improved over general metal film resistors, with a maximum resistance change of 0.16% after 1000 hours at +70 ambient temperature under rated power. The leaded structure minimizes PCB stress, making it highly suitable for circuits requiring high TCR and stability. It also boasts strong moisture resistance.
Product Attributes
- Brand: C&B Electronics
- Origin: Shenzhen, China
- Material: 95% Alumina Ceramic Cores, Precision Metal Film
- Certifications: IEC 60115-1
Technical Specifications
| Model | Rated Power | Max. Operating Voltage | Operating Temperature | TCR | Resistance Tolerance | Max. Overload Voltage | Dimensions (L x D x d) | Packaging Quantity Per Bulk |
| MMFR3679 | 1.33W | 161V | -55~+155 | 10ppm/ | 0.16%, 0.2%, 0.5%, 1% | 261V | 3.60.5 x 1.70.16 x 1.70.16 | 1000pcs |
| MMFR4821 | 1.6W | 211V | -55~+155 | 10ppm/ | 0.16%, 0.2%, 0.5%, 1% | 411V | 4.80.5 x 1.70.16 x 1.70.16 | 200pcs |
| MMFR6326 | 2.1W | 411V | -55~+155 | 10ppm/ | 0.16%, 0.2%, 0.5%, 1% | 461V | 6.30.5 x 1.90.16 x 1.90.16 | 200pcs |
| MMFR7629 | 2.1W | 511V | -55~+155 | 10ppm/ | 0.16%, 0.2%, 0.5%, 1% | 511V | 7.60.5 x 2.10.16 x 2.10.16 | 200pcs |
| Performance Test | Test Method | Standards | Max. Change |
| Moisture Resistance | 703, 90%-96% RH for 67 days, 1.2xRCWV or the maximum operating voltage (the lower one) | IEC 60115-1, 5.3.15 | 0.16% + 0.16 |
| Insulation Resistance | Apply a DC voltage of 211V between the electrode and the substrate for 60s and measure the insulation resistance | IEC 60115-1, 5.3.7 | 10000M, minimum |
| Load Life | 703, 1000h, RCWV or maximum operating voltage (the lower one) | IEC 60115-1, 5.3.16 | 0.16% + 0.16 |
| TCR | +70, +15 Ref. | IEC 60115-1, 5.9 | Within the nominal value range |
| Resistance to Solder Heat | +3504, 2s, immersed 40.5mm of the body | IEC 60115-1, 5.29 | 0.16% + 0.16 |
| Short-Time Overload | 2x RCWV or 1x maximum operating voltage (the lower one) for 6s | IEC 60115-1, 5.24 | 0.13% No visible damage |
| Resistance to Solvent | Immerse in IPA for 5 min with ultrasonic | IEC 60115-1, 5.41 | Clear marking No visible damage |
| Solderability | 1455, 40.5s | IEC 60115-1, 5.28 | 0.16% + 0.16 |
| Dielectric Withstanding Voltage | Apply a AC voltage with an effective maximum overload voltage between the electrode and the substrate at a speed of approximately 200V/s, for 60s | IEC 60115-1, 4.7 | No breakdown or flashover |
2409141123_RESI-MMFR5215B1M00V9_C18164702.pdf
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