MMFR Precision Molded Metal Film Resistors
The MMFR series are precision molded metal film resistors designed to meet the challenges of customer design and manufacturing. 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 molded construction and pin-type terminals reduce stress on the PCB, making them ideal for high-precision instruments, industrial control equipment, and precision power supplies where temperature coefficient and resistance stability are critical.
Product Advantages
- Precision metal film deposition technology
- Strong moisture resistance
- High precision and low temperature coefficient
- High load life stability
- Reduced PCB stress due to pin-type terminals
Applications
- Precision instruments and meters
- Industrial control equipment
- Precision power supplies
Product Attributes
- Brand: RESI (implied by silk screen example)
- Origin: Shenzhen Kaipu Electronics Co., Ltd.
- Material: Alumina ceramic rod, metal film
Technical Specifications
| Series | Power (+85C) | Temp. Coefficient | Resistance Range | Available Precision | Max. Working Voltage | Dimensions (L x D) | Max. Overload Voltage |
|---|---|---|---|---|---|---|---|
| MMFR1679 | 1.33W | 50ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 161V | 3.6 x 1.7 | 611V |
| MMFR4821 | 1.6W | 50ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 211V | 4.8 x 1.7 | 711V |
| MMFR63126 | 2.1W | 50ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 411V | 6.3 x 1.9 | 811V |
| MMFR7629 | 2.1W | 50ppm/ | 21-2M | 0.16%, 0.2%, 0.6%, 1% | 511V | 7.6 x 2.1 | 911V |
Performance Indicators
| Test Item | Test Method | Standard | Max. Value | Remark |
|---|---|---|---|---|
| Load Life | 85C, 1000h, rated voltage or max. working voltage (whichever is smaller) | IEC 60115-1, 4.15 | 0.16%+0.16 | |
| Short-time Overload | 2x rated voltage or 3x max. working voltage (whichever is smaller), 5s | IEC 60115-1, 4.13 | Within specified value | |
| Solvent Resistance | Immersion in IPA for 5 minutes, with ultrasonic cleaning | IEC 60115-1, 4.13 | 0.16%+0.16 | No visible damage |
| Solderability | 10s2s, immersion 40.5mm, at 35010C | IEC 60115-1, 4.17 | 95% coverage | Clear marking, no visible damage |
| Damp Heat | 55C, 90%-95% RH, 67 days, 0.1x rated voltage or max. working voltage (whichever is smaller) | IEC 60115-1, 4.24 | 0.16%+0.16 | |
| Dielectric Withstanding Voltage | AC voltage with effective value of max. overload voltage applied between terminals at a rate of 200V/s, hold 60s | IEC 60115-1, 4.13 | No breakdown or arcing | |
| Insulation Resistance | DC voltage of 200V applied between terminals and substrate, hold 60s, then measure insulation resistance | IEC 60115-1, 4.14 | 20,000 M |
Marking
- Example: RES(Brand), 21R1(Resistance 21), B(Tolerance 0.2%), T50(Temp. Coefficient 50ppm/), 1411(Production Date 2014, 11th week)
- Line 1: First four characters for brand, last four for resistance value.
- Line 2: First character for tolerance, second and third for temperature coefficient, last four for production date.
Version Change Log
| Version | Effective Date | Auditor | Change Information |
|---|---|---|---|
| V1 | 2014/5/31 | LFY | New product release |
Disclaimer
All products, product descriptions, and data are subject to change without notice. Shenzhen Kaipu Electronics Co., Ltd. and its affiliates assume no legal liability for any errors, inaccuracies, or incompleteness of information related to the products. Product descriptions do not extend or amend Kaipu Electronics' terms and conditions of purchase, including but not limited to warranties. Except as expressly stated in the terms and conditions of purchase, Kaipu Electronics makes no warranties, representations, or guarantees. To the maximum extent permitted by applicable law, Kaipu Electronics disclaims all liability for product use, including indirect or incidental damages, and all implied warranties. Information provided in datasheets and parameter tables may vary in different applications, and product performance may change over time. Recommended applications are based on Kaipu Electronics' knowledge and experience. Customers are obligated to verify product suitability for specific applications. Ensure you have the latest information from resistor.today. This agreement does not grant any license to Kaipu Electronics' intellectual property. Unless otherwise specified, products listed are not intended for life-saving or life-sustaining applications. Any unauthorized use in such applications is at the customer's own risk.
2411191526_RESI-MMFR2568B300RV9_C27859219.pdf
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