Power Metal Film Chip Resistors (SMF)
In the metal layer to achieve a homogenous crystalline structure, DeMint Electronics' surface mount power type metal film package resistor (SMF) benefits from the key advantages of today's sputtering technology for the tight control of metal film thickness.
By photolithography, the same length and width of the resistive element can be controlled by the same precision and accuracy as the thickness of the sputtered metal film layer.
Surface Mounted Power Metal Film Resistors (SMF) have good accuracy tolerances, good stability and low TCR characteristics. In addition, due to the low voltage coefficient, the resistor has low noise characteristics and high linearity. Thus, in important circuits, (SMF) power chip resistors are commonly used in active filters or bridge circuits.
DeMint (SMF) power-type metal film molded resistors provide three power, 2W, 3W, and 5W. Resistance range of 10Ω ~ 2MΩ, and the maximum working voltage up to 500V. The tolerance accuracy has two options ±1% (F), and ±5% (J) with temperature coefficient of ±100ppm/°C.
(SMF) series are available in tapes, RoHS compliant and 100% lead free. For conventional parameters, specifications outside the parameters, or technical requirements, please contact DeMint.
Download complete PDF Power Metal Film Chip Resistors.
- Automatic surface mount special design. Lower assembly costs.
- Excellent electrical stability and mechanical strength.
- Flameproof UL94V0 Resin molded package.
- Heat resistant, moisture resistant, insulated.
- Consumer electronics, computers.
- Telecommunications, control equipment and so on.
| Construction & Dimensions (Unit: mm) (SMF) | |||||||||
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| Rated Wattage | A ±0.3 | B ±0.3 | C ±0.3 | D ±0.3 | E Max. | F ±0.3 | Resistance Range (Ω) | Max. Working Voltage (V) | |
| 2W | 4.0 | 6.7 | 1.4 | 3.55 | 7.9 | 1.5 | 10 ~ 2M | 300 | |
| 3W | 5.5 | 10.5 | 1.7 | 5.0 | 12 | 2.3 | 10 ~ 2M | 500 | |
| 5W | 7.3 | 13.5 | 1.7 | 6.8 | 17 | 2.5 | 10 ~ 2M | 500 | |
- Rated Continuous Working Voltage (RCWV) = √ ( P × R ) , or Max. Operating Voltage listed in above table whichever is lower.
- Resistance or specifications outside the parameters can be on request.
| Electrical And Mechanical Performance (SMF) | ||
| Characteristics | Standards | Test Methods |
| Resistance Tolerance | ±5% (J) or ±1% (F) | - |
| TCR | ±100ppm/°C | -55°C ~ 200°C |
| Power Rating Load | Surface temp. 275°C Max. | Rated voltage for 30 minutes |
| Short Time Overload | ±(1% + 0.05Ω) | 5 times rated power with applied voltage not to exceed 2 times maximum continuous operating voltage for 5 seconds. |
| Dielectric Withstanding Voltage | No evidence of mechanical damage or insulation breakdown. | AC 500V for 1 minutes |
| Insulation Resistance | 10,000MΩ | DC 500V megger |
| Solder-ability | Minimum 95% coverage | 235 ± 5°C for 2 seconds |
| Resistance to Soldering Heat | No evidence of mechanical damage. ±(1% + 0.05Ω) | 270 ± 5°C for 10±1 seconds |
| Environmental Characteristics (SMF) | ||
| Characteristics | Standards | Test Methods |
| Temp. Cycle | ±(1% + 0.05Ω) | -55°C (30min.) → Room Temp. (3min.) → +200°C (30min.) → Room Temp. (3min.)/(5cycles) |
| Load Life | ±(1% + 0.05Ω) | Rated power load 90 minutes ON 30 minutes OFF 70°C 1000 hours |
| Moisture-proof Load Life | ±(1% + 0.05Ω) | Rated power load 90 minutes ON 30 minutes OFF 40°C 95% RH 500 hours |
| Derating Curve (SMF) | |
For resistors operated in ambient temperatures above 20°C, power rating must be derated in accordance with the curve below. |
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| Surface Temperature Rise (SMF) | |
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| Order Codes (SMF) | |||||||||||||||||||||||||
| SMF | 2W | 10Ω | J | ||||||||||||||||||||||
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