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.
| Type | Body Length (L, mm) | Cap Diameter (D1, mm) | Body Diameter (D2, mm) | Soldering Spot (B, mm) | Net Weight Per 1000 pcs |
|---|---|---|---|---|---|
| 1/6W | 3.52 ± 0.15 | 1.35 ± 0.1 | D1 + 0.02/ -0.15 | 0.6 Min. | 17 grams |
| 1/4W | 3.52 ± 0.15 | 1.35 ± 0.1 | D1 + 0.02/ -0.15 | 0.6 Min. | 17 grams |
| 1/3W | 5.90 ± 0.20 | 2.20 ± 0.1 | D1 + 0.02/ -0.2 | 1.0 Min. | 66 grams |
| 1/2W | 5.90 ± 0.20 | 2.20 ± 0.1 | D1 + 0.02/ -0.2 | 1.0 Min. | 66 grams |
| 1W | 5.90 ± 0.20 | 2.20 ± 0.1 | D1 + 0.02/ -0.2 | 1.0 Min. | 66 grams |
| Power Rating (at 70°C) | Maximum Working Voltage (AC/DC) | Maximum Overload Voltage (AC/DC) | Minimum Resistance | Maximum Resistance | Resistance Tolerance | Available Resistance Values |
|---|---|---|---|---|---|---|
| 1/6W | 200V | 400V | 10Ω | 1MΩ | ±0.5% | E - 192 |
| 1/4W | 200V | 400V | 10Ω | 1MΩ | ±0.5% | E - 192 |
| 1/3W | 300V | 500V | 10Ω | 1MΩ | ±0.5% | E - 192 |
| 1/2W | 300V | 500V | 10Ω | 1MΩ | ±0.5% | E - 192 |
| 1W | 300V | 500V | 10Ω | 1MΩ | ±0.5% | E - 192 |
| Characteristics | Ranges & 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 |
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Resistor Supplies - Jepsun Tech Corporation
+86755-29796190 +8615920026751 [email protected]
Huangjiazhongxin building Donghuan Road Longhua District SHENZHEN City, GUANGDONG Prov. CHINA 518000
