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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. Precision MELF RJM resistors are made by metal film alloy deposited on a ceramic rod by a vacuum process of evaporation or sputtering with excellent characteristics and stable. TOKEN full line of Precision MELF RJM resistors with more stability, moisture proof, low TCR, and compacted size meet RoHS Directives, MIL-R-10509, MIL-R-55182, and other military grade. Token MELF Precision RJM allows designers to guarantee a high degree of accuracy in fixed-resistor applications. Applications include precision amplifiers, high-precision instrumentation, medical and automatic test equipment, high-end stereo equipment, electron beam scanning and recording equipment, as well as military, aerospace, and down-hole equipment and instrumentation. |
| MELF Precision Resistor Features |
－ Tolerance up to ±0.05%. － Advanced thin film technology. － Low TCR: lower than ±5ppm/°C. － Power dissipation rating up to 5W. － Excellent overall stability: Class 0.10. － Wide resistance range: 0.1Ω to 22MΩ. － Very high ratio of performance to price. |
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| Precision MELF Resistor Quick Reference Data |
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| Type | RJM72P | RJM73S | RJM73P | RJM74S | RJM74P | RJM16M | RJM17M | RJM18M | |
| Metric type | DIN: 0102 | DIN: 0204 | DIN: 0207 | DIN: 0411 | |||||
| Rated dissipation P70 | 0.125W | 0.125W | 0.25W | 0.25W | 0.50W | 1.0W | 2.0W | 3.0W | |
| Resistance range (Ω) | 10 ~ 1M | 0.1 ~ 10M | 0.1 ~ 22M | 0.1 ~ 22M | |||||
| Resistance tolerance (%) | J ( ±5 ); F ( ±1 ); D ( ±0.5 ); C ( ±0.25 ); B ( ±0.10 ); A5 ( ±0.05 ) | ||||||||
| Temperature coefficient (ppm/°C) |
C2 ( ±50 ); C3 ( ±25 ); C5( ±15 ); C6 ( ±10 ); C7 ( ±5 ) | ||||||||
| Climatic category (LCT/UCT/days) |
55 / 125 / 56 | ||||||||
| Operating voltage Umax | 200V | 200V | 250V | 250V | 300V | 350V | 400V | 450V | |
| Temperature range | -55°C to 125°C | ||||||||
| Insulation voltage (V) | 300 | 300 | 300 | 300 | 600 | 700 | 800 | 900 | |
| Insulation resistance | >1GΩ | ||||||||
| Dimension (mm) | L(±0.2) | 2.2 | 3.5 | 5.5 | 5.9 | 8.6 | 11.6 | ||
| L1(±0.2) | 1.0 | 1.6 | 3.5 | 3.9 | 6.2 | 8.8 | |||
| D(±0.2) | 1.3 | 1.3 | 2.1 | 2.1 | 3.1 | 3.6 | |||
| K(±0.1) | 0.4 | 0.8 | 1.0 | 1.2 | 1.5 | 1.6 | |||
| D1(±0.1) | D+0/D-0.15 | D+0/D-0.25 | D+0/D-0.5 | D+0/D-0.5 | D+0/D-0.5 | D+0/D-0.5 | |||
| Soldering bath (recommended) (mm) |
S | 1.0 | 1.6 | 2.6 | 2.8 | 5.6 | 8.2 | ||
| W | 2.0 | 2.5 | 2.5 | 2.8 | 3.2 | 4.0 | |||
| H | 2.0 | 2.5 | 2.5 | 2.8 | 3.8 | 4.5 | |||
| Notice |
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| How to Order |
| RJM74P | 10R | D | C6 | T |
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| Product type | Resistance Value (Ω) | Resistance Tolerance (%) |
Temperature coefficient (ppm/°C) |
Packaging |
| RJM72P | 10 ~ 1M | J (±5) F (±1) D (±0.5) C (±0.25) B (±0.10) A5 (±0.05) |
C2 (±50) C3 (±25) C5 (±15) C6 (±10) C7 (±5) |
T (Taping Reel) P (Bulk) |
| RJM73S RJM73P |
0.1 ~ 10M | |||
| RJM74S RJM74P RJM16M |
0.1 ~ 22M | |||
| RJM17M RJM18M |
0.1 ~ 22M |
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