MMFR Precision Molded Metal Film Resistor
The MMFR series are precision molded metal film resistors designed to meet the manufacturing challenges of the global electronics industry. Utilizing advanced metal film deposition technology on an alumina ceramic rod, these resistors offer high precision, low temperature coefficients, and excellent load life stability. The leaded structure helps reduce PCB stress, making them ideal for electronic circuits requiring high accuracy and stability, particularly in precision instruments, industrial control equipment, and precision power supplies.
Product Advantages
- Precision metal film deposition technology for strong moisture resistance.
- High precision, low temperature coefficient, and high load life stability.
- Utilizes 95% alumina ceramic rod with precision metal film deposition and laser trimming.
- Minimum temperature coefficient of 10ppm/.
- Significantly improved load stability compared to general metal film resistors: maximum resistance change of 0.16% within 1000 hours at rated power under 70 ambient temperature.
- Strong moisture resistance.
- Leaded structure reduces the impact of PCB stress on the resistor.
- Highly suitable for electronic circuits with high requirements for temperature coefficient and resistance stability.
Product Attributes
- Brand: RESI
- Manufacturer: Shenzhen Kebu Electronics Co., Ltd.
- Website: www.resistor.today
- Email: resi@cbeureka.com
- Tel: 86-755-29393062
Technical Specifications
| Series | Power (+70) | Temperature Coefficient | Resistance Range | Available Precision | Max. Working Voltage | Working Temperature Range | Resistance Standard | Max. Overload Voltage |
|---|---|---|---|---|---|---|---|---|
| MMFR1679 | 0.6W | 10ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 161V | -60~+155 | E12, E24 | 201V |
| MMFR4821 | 0.86W | 10ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 211V | -60~+155 | E12, E24 | 261V |
| MMFR63126 | 1.1W | 10ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 311V | -60~+155 | E12, E24 | 401V |
| MMFR7629 | 2.1W | 10ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 411V | -60~+155 | E12, E24 | 511V |
Dimensions and Packaging
| Series | L (mm) | D (mm) | d (mm) | Packaging Quantity |
|---|---|---|---|---|
| MMFR1679 | 3.60.5 | 1.70.16 | 0.70.16 | 1000pcs (Bag) |
| MMFR4821 | 4.80.5 | 1.70.16 | 0.70.16 | 2000pcs (Bag) |
| MMFR63126 | 6.30.5 | 1.90.16 | 0.90.16 | 2000pcs (Bag) |
| MMFR7629 | 7.60.5 | 2.10.16 | 1.00.16 | 2000pcs (Bag) |
Marking Description
Example: RES(I Brand), 21R1 (Resistance 21), B (Precision 0.2%), T6 (Temperature Coefficient 10ppm/), 1411 (Production Date 2014, Week 11)
First Line: First four digits represent the brand, last four digits represent the resistance value.
Second Line: First digit represents precision, second and third digits represent temperature coefficient, last four digits represent production date.
Example Graphic: RESI 21R1 B T6 1411
Performance Specifications
| Test Item | Test Method | Standard | Max. Value | Remark |
|---|---|---|---|---|
| Load Life | 703, 1000h, rated voltage or max. working voltage (whichever is smaller) | IEC 60115-1, 4.25 | 0.16%+0.16 | |
| Short-time Overload | 2 times rated voltage or 3 times max. working voltage (whichever is smaller), 5 seconds | IEC 60115-1, 4.13 | Within specified value | |
| Solvent Resistance | Immerse in IPA for 5 minutes and use ultrasonic cleaning | IEC 60115-1, 4.17 | 0.16%+0.16 | Clear marking, no visible damage |
| Solderability | 1555, 40.5s, immersion 40.5mm | IEC 60115-1, 4.17 | 95% coverage | |
| Damp Heat | 503, 90%-96% RH, 67 days, 0.1 times rated voltage or max. working voltage (whichever is smaller) | IEC 60115-1, 4.23 | 0.16%+0.16 | |
| Dielectric Withstanding Voltage | AC voltage with RMS value of max. overload voltage applied between terminals at a rate of 200V/s, maintain for 60 seconds | IEC 60115-1, 4.14 | No breakdown or arcing | |
| Insulation Resistance | Apply DC voltage of 100V between terminals and substrate, maintain for 60 seconds, then measure insulation resistance | IEC 60115-1, 4.15 | 10000M |
Derating Curve
Note: The graph displays power derating based on ambient temperature.
Version Change Log
| Version | Effective Date | Auditor | Change Information |
|---|---|---|---|
| V1 | 2023/5/29 | LFY | New product release |
Disclaimer
All products, product descriptions, and data are subject to change without notice. Shenzhen Kebu Electronics Co., Ltd. and its affiliates, agents, employees, and any other persons acting on their behalf (collectively, "Kebu Electronics") shall not be liable for any errors, inaccuracies, or omissions in the information related to the product provided in this agreement or other disclosures. Product descriptions do not constitute an extension or modification of Kebu Electronics' terms and conditions of purchase, including but not limited to warranties under this agreement. Kebu Electronics makes no warranties, representations, or guarantees, except as expressly stated in the terms and conditions of purchase. To the maximum extent permitted by applicable law, Kebu Electronics disclaims all liability: (1) arising from the use of the product; (2) including, but not limited to, liability for special, indirect, or incidental damages; (3) all implied warranties, including warranties of fitness for a particular purpose, non-infringement, and merchantability. Information provided in specification sheets and parameter tables may vary in different applications, and product performance may change over time. Recommended application descriptions for products are based on Kebu Electronics' understanding and experience of typical requirements. Customers are obligated to verify the suitability of the product for a specific application based on the parameters provided in the product description. Before formally installing or using the product, you should ensure you have obtained the latest version of the relevant information, which can be found on the resistor.today website. The signing of this agreement does not constitute any disclosure, implied or other form of license related to Kebu Electronics' product intellectual property rights. Unless expressly stated otherwise, the products listed in this agreement are not suitable for life-saving or life-sustaining products. In the absence of explicit indication, any risk arising from the customer's unauthorized use in the aforementioned products shall be borne by the customer, who agrees to fully indemnify Kebu Electronics for any losses incurred due to such sale or use. For product documentation for such special applications, please contact authorized Kebu Electronics personnel. Product names and markings listed may be trademarks owned by others.
2411191526_RESI-MMFR2568B33R0V9_C29716812.pdf
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