MMFR Precision Molded Metal Film Resistors
The MMFR series of precision molded metal film resistors offers high accuracy, low temperature coefficient, and excellent load life stability. Utilizing 96% alumina ceramic rods and precision metal film deposition technology, these resistors achieve target resistance values through laser trimming. With a minimum temperature coefficient of 5ppm/ and superior load stability (maximum resistance change of 0.05% after 1000 hours at 70 under rated power), they are well-suited for electronic circuits demanding high precision and stability. The pin structure is designed to minimize PCB stress impact. Ideal for precision instruments and meters.
Product Attributes
- Brand: RESI (implied by marking)
- Origin: Shenzhen KaiBu Electronics Co., Ltd.
- Material: 96% Alumina Ceramic Rod
Technical Specifications
| Series | Size | Power (+70) | Resistance Range | Temperature Coefficient | Optional Accuracy | Max. Working Voltage | Max. Overload Voltage | Working Temperature Range | Resistance Standard |
|---|---|---|---|---|---|---|---|---|---|
| MMFR2568 | 2568 | 0.25W | 10-1M | 5 ppm/ | 0.05%, 0.1%, 0.5%, 1.0% | 250V | 500V | -50~+125 | E24, E96 |
| MMFR3710 | 3710 | 0.5W | 10-1M | 5 ppm/ | 0.05%, 0.1%, 0.5%, 1.0% | 300V | 600V | -50~+125 | E24, E96 |
| MMFR5215 | 5215 | 0.75W | 10-1M | 5 ppm/ | 0.05%, 0.1%, 0.5%, 1.0% | 350V | 700V | -50~+125 | E24, E96 |
| MMFR6518 | 6518 | 1.0W | 10-1M | 5 ppm/ | 0.05%, 0.1%, 0.5%, 1.0% | 400V | 800V | -50~+125 | E24, E96 |
Dimensions and Packaging
| Size | L (mm) | D (mm) | d (mm) | Packaging | Quantity per Bag |
|---|---|---|---|---|---|
| 2568 | 2.50.4 | 6.80.4 | 0.60.05 | Bag | 200pcs |
| 3710 | 3.70.4 | 10.00.4 | 0.60.05 | Bag | 100pcs |
| 5215 | 5.20.4 | 14.80.4 | 0.60.05 | Bag | 100pcs |
| 6518 | 6.50.4 | 18.30.4 | 0.80.05 | Bag | 100pcs |
Marking Description
First line: RESI (Brand), Resistance Value (e.g., 10R0 for 10). Second line: Accuracy Code (e.g., B for 0.1%), Temperature Coefficient Code (e.g., T5 for 5ppm/), Production Date Code (e.g., 2320 for 2023, 20th week).
Performance Specifications
| Test Item | Test Method | Standard | Max. Value |
|---|---|---|---|
| Load Life | 702, 1000h, rated power or max. working voltage (min of both) | 0.05% | |
| Temperature Coefficient | Measurement point +85, reference point +25 | 5ppm/ | |
| Soldering Heat Resistance | +2603, 101s, immersion 30.5mm | IEC 60115-1, 4.24 | 0.05%+0.05 |
| Short-time Overload | 10x rated voltage or 2x max. working voltage (min of both), 5s | IEC 600115-1 4.7 | 0.05%+0.05 |
| Solvent Resistance | Immersion in IPA for 5 minutes, with ultrasonic cleaning | IEC 600115-1 4.6 | No visible damage |
| Solderability | 2355, 30.5s | IEC 600115-1 4.25 | 95% coverage, clear marking, no visible damage |
| Damp Heat | 402, 90-95% RH, 56 days, 0.1x rated voltage or max. working voltage (min of both) | IEC 600115-1 4.8 | 0.05%+0.05 |
| Dielectric Strength | AC voltage at approx. 100V/s to max. overload voltage, held for 60s | IEC 600115-1 4.18 | No breakdown or arcing |
| Insulation Resistance | DC voltage of 100V applied between terminals, held for 60s, then measure insulation resistance | IEC 600115-1 4.13 | 10000M minimum |
2402051755_RESI-MMFR2568B250RV9_C7603289.pdf
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