Metal Film MELF Precision Resistor
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Metal Film MELF Precision Resistor

The metal-film precision resistor with a melf (metal electrode leadless face) design stands out as the ideal component for modern professional electronic equipment seeking ultimate reliability and stability, thanks to its exceptional power rating range of 0.16W to 1W, a broad resistance range spanning from 10 ohms to 1M ohms, and a tight tolerance of ±0.1%. This resistor adopts an advanced surface-mount device (SMD) structure and incorporates a unique melf design, which not only significantly outperforms traditional chip resistors in heat dissipation but also boasts a more robust mechanical structure, demonstrating remarkable resilience to vibration and thermal shock. As the most precise resistor in the FIRSTOHM product catalog, it undoubtedly represents the pinnacle of resistor technology.


TypeBody Length (L, mm)Cap Diameter (D1, mm)Body Diameter (D2, mm)Soldering Spot (B, mm)Net Weight Per 1000 pcs
1/6W3.52 ± 0.151.35 ± 0.1D1 + 0.02/ -0.150.6 Min.17 grams
1/4W3.52 ± 0.151.35 ± 0.1D1 + 0.02/ -0.150.6 Min.17 grams
1/3W5.90 ± 0.202.20 ± 0.1D1 + 0.02/ -0.21.0 Min.66 grams
1/2W5.90 ± 0.202.20 ± 0.1D1 + 0.02/ -0.21.0 Min.66 grams
1W5.90 ± 0.202.20 ± 0.1D1 + 0.02/ -0.21.0 Min.66 grams


Power Rating (at 70°C)Maximum Working Voltage (AC/DC)Maximum Overload Voltage (AC/DC)Minimum ResistanceMaximum ResistanceResistance ToleranceAvailable Resistance Values
1/6W200V400V10Ω1MΩ±0.5%E - 192
1/4W200V400V10Ω1MΩ±0.5%E - 192
1/3W300V500V10Ω1MΩ±0.5%E - 192
1/2W300V500V10Ω1MΩ±0.5%E - 192
1W300V500V10Ω1MΩ±0.5%E - 192


CharacteristicsRanges & Limits
Operating Temperature Range, °C-55 ~ +125
Temperature Coefficient, PPM / °C*±5, ±10, ±15, ±25, ±50 (See below for availability)
Insulation Resistance, MΩ>10⁴
Tin Whisker (JESD201 Temperature Cycling & High Temp./Humidity Storage), μm<5


In addition to Metal Film MELF Precision Resistor, we also focus on the following resistors:
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We offer comprehensive storage, procurement, and distribution services for a wide range of resistor products to electronic manufacturers spanning diverse industries.
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Our quality control procedures guarantee that you will receive resistor products of the highest quality, devoid of any nonconformities or suspicious anomalies typically encountered in the electronics industry.
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Our component procurement team and internal data analysis team are consistently endeavoring to uncover valuable opportunities for our clients, focusing on their critical components, in order to facilitate cost reductions through spot purchases.
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Resistor Supplies - Jepsun Tech Corporation

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