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MELF is the abbreviation for Metal Electrode Leadless Face - a leadless cylindrical component that is metallized on two ends.
It is designed majorly as a SMD component. Since manufacturing process of MELF resistor is more complex than flat-chip resistor,
MELF resistor has its own advantages over flat-chip type. Carbon Film RDM MELF resistors are made by breaking down hydrocarbon gases at high temperature in a vacuum to form a carbonic deposit on the surface of a cylindrical substrate with excellent characteristics and stable. TOKEN MELF RDM resistors meet RoHS Directives. |
| Carbon MELF Resistor Features |
－ Coating color : Yellow. － Marking : Color code (3 color band). － Suitable for reflow, flow and iron soldering. － High solderability due to specially plated electrodes. － Electrodes strength is higher than flat chip resistors. － Free direction for mounting due to cylindrical design. － Lower current noise than thick film flat chip resistors. |
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| MELF Resistor Quick Reference Data |
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| Type | RDM73S | RDM73P | RDM74S | RDM74P | RDM16M | RDM17S | RDM17P | |
| DIN-44061 type | 0204 | 0204 | 0207 | 0207 | 0207 | 0309 | 0309 | |
| Power Rating (W) | 1/8 | 1/4 | 1/4 | 1/2 | 1 | 1/2 | 1 | |
| Resistance Range (Ω) E24 | 1 ~ 1M | |||||||
| Resistance Tolerance | G: ±2% J: ±5% | |||||||
| Max. Working Voltage (V) | 200 | 250 | 300 | 300 | 350 | 350 | 350 | |
| Max. Overload Voltage (V) | 400 | 500 | 600 | 600 | 700 | 700 | 700 | |
| Packaging & Qty (pcs) |
Case | 60000 | 60000 | 24000 | 24000 | 12000 | 12000 | 24000 |
| Reel | 3000 | 3000 | 1500 | 1500 | 1000 | 1000 | 1500 | |
| Dimensions (mm) | L | 3.5±0.2 | 3.5±0.2 | 5.9±0.2 | 5.9±0.2 | 5.9±0.2 | 8.5±0.2 | 8.5±0.2 |
| C (Min.) | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| D1 | 1.40±0.15 | 1.40±0.15 | 2.2±0.1 | 2.2±0.1 | 2.2±0.1 | 3.2±0.2 | 3.2±0.2 | |
| D2 (Max.) | 1.55 | 1.55 | 2.4 | 2.4 | 2.4 | 3.4 | 3.4 | |
| D3 (Max.) | 1.25 | 1.25 | 2.1 | 2.1 | 2.1 | 3.0 | 3.0 | |
| MELF Resistor Characteristics |
| Item | Characteristics | Test Method | ||||
| Temp. Coefficient (PPM/°C) | 0 ~ -350 | 0 ~ -600 | 0 ~ -1000 | 0 ~ -1500 | JIS-C(5202-5.2) | |
| >1/4W | <10K | 11K~115K | 160K~2M2 | - | ||
| 1/8W | <1K | 1K1~47K | 51K~470K | 510K~1M | ||
| Short Time Overload | ± (1.0% + 0.05Ω) | JIS-C(5202-5.5) | ||||
| Intermittent | ± (1.0% + 0.05Ω) | JIS-C(5202-5.8) | ||||
| Resistance to Soldering | ± (1.0% + 0.05Ω) | JIS-C(5202-6.4) | ||||
| Solderability | 95% Coverage min | JIS-C(5202-6.5) | ||||
| Moisture Resistance | ± (5.0% + 0.1Ω) | JIS-C(5202-7.9) | ||||
| Load Life | ± (3.0% + 0.1Ω) | JIS-C(5202-7.10) | ||||
| How to Order |
| RDM74P | 1R | J | T |
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| Product type | Resistance Value (Ω) | Resistance Tolerance (%) | Packaging |
| RDM73S RDM73P RDM74S RDM74P RDM16M RDM17S RDM17P |
1 ~ 1M | G (±2) J (±5) |
T (Taping Reel) P (Bulk) |
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