MELF RESISTORS

Carbon Film MELF Resistors

RDM

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 is more complex than flat-chip resistor, the performance/price ratio of MELF is better than flat-chip resistor.

Carbon Film RDM MELF 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.

The MELF RDM series is lead-free and RoHS compliant. Detailed specifications, both mechanical and electrical, please contact our sales representative for more information.

Carbon Film MELF Resistors

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.

Characteristics & Dimensions (mm) - Carbon Melf RDM

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

Characteristics - Carbon Melf RDM

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 - Carbon Film Melf Resistors RDM

RDM74P 1R J T
Product Type
RDM73S
RDM73P
RDM74S
RDM74P
RDM16M
RDM17S
RDM17P
Resistance Value (Ω)
1 ~ 1M
Resistance Tolerance (%)
G ±2
J ±5
Packaging
T Taping Reel
P Bulk

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RDM series - Carbon Melf Resistors