MMFR Precision Molded Metal Film Resistors
The MMFR series of precision molded metal film resistors are designed to meet the challenges of customer design and manufacturing in precision instruments, industrial control equipment, and precision power supplies. Utilizing advanced metal film deposition technology on 95% alumina ceramic rods, these resistors achieve target resistance values through laser trimming. They offer high precision, low temperature coefficients, and excellent load life stability, making them ideal for electronic circuits with demanding requirements for temperature stability and resistance accuracy. The robust construction, including leaded terminals, helps mitigate PCB stress, and the resistors exhibit strong moisture resistance.
Product Attributes
- Brand: KAIYU ()
- Origin: Shenzhen, China
Technical Specifications
| Series | Power (+85) | Temperature Coefficient | Resistance Range | Available Precision | Max. Working Voltage | Operating Temperature Range | Resistance Standard | Max. Overload Voltage |
| MMFR1679 | 0.16W | 100ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 161V | -40~+125 | E12, E24 | 201V |
| MMFR4821 | 0.25W | 100ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 211V | -40~+125 | E12, E24 | 261V |
| MMFR63126 | 0.5W | 100ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 401V | -40~+125 | E12, E24 | 301V |
| MMFR7629 | 1W | 100ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 501V | -40~+125 | E12, E24 | 401V |
Dimensions and Packaging
| Series | L (mm) | D (mm) | d (mm) | Packaging Quantity |
| MMFR1679 | 3.60.5 | 1.70.16 | 0.70.16 | 1000pcs |
| MMFR4821 | 4.80.5 | 1.70.16 | 0.90.16 | 2000pcs |
| MMFR63126 | 6.30.5 | 1.90.16 | 1.00.16 | 2000pcs |
| MMFR7629 | 7.90.5 | 2.10.16 | 1.20.16 | 2000pcs |
Marking Instructions
Example: RES(Brand) 21R1(Resistance) B(Tolerance) T6(Temp. Coefficient) 1411(Date Code)
First Line: First four digits indicate brand, last four digits indicate resistance.
Second Line: First digit indicates tolerance, second and third digits indicate temperature coefficient, last four digits indicate production date.
Performance Specifications
| Test Item | Test Method | Standard | Max. Value |
| Load Life | +853, 1000h, rated voltage or max. working voltage (whichever is smaller) | IEC 60115-1, 4.25 | 0.16%+0.16 |
| Short-time Overload | 2x rated voltage or 3x max. working voltage (whichever is smaller), 5s | IEC 60115-1, 4.13 | 0.16%+0.16 |
| Solvent Resistance | Immersed in IPA for 5 minutes, with ultrasonic cleaning | IEC 60115-1, 4.17 | No visible damage |
| Solderability | 1556, 20.5s, immersed 40.5mm | IEC 60115-1, 4.11 | 95% coverage |
| Humidity Test | 503, 90-96% RH, 67 days, 0.1x rated voltage or max. working voltage (whichever is smaller) | IEC 60115-1, 4.41 | 0.16%+0.16 |
| Dielectric Withstanding Voltage | AC voltage with RMS value of max. overload voltage applied between terminals and substrate at a rate of 200V/s, held for 75s | IEC 60115-1, 4.13 | No breakdown or arcing |
| Insulation Resistance | DC voltage of 200V applied between terminals and substrate, held for 75s, then measure insulation resistance | IEC 60115-1, 4.14 | 20000M |
For higher or lower resistance values, higher precision, higher power, lower temperature coefficients, or larger dimensions, please contact us.
2411191526_RESI-MMFR3710B33R0V9_C28515729.pdf
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