MELF electronic components

Metal Electrode Leadless Faces ( MELF ) is a cylindrical design of SMD components with two connections. In it, the end faces are designed as contacts. Terminal lugs or wires are missing ( leadless ). Usually it involves diodes for which this design is chosen.

For thermistors ( NTC, PTC) resistors and the design is used. Although most chip designs are used for resistors in SMD technology, the MELF is still to be found. With regard to pulse current load, temperature stability, long-term stability and dielectric strength have MELF resistors on better values.

Special features of MELF resistors

Although they are substantially greater than similar chip SMD components, resistors in MELF housing continue to be used in the electronics production. This is mainly because they have a well- defined behavior under fault conditions. While a chip SMD resistor in case of error unpredictable either high or low, the MELF resistor due to its structure can only be high impedance.

Shapes and sizes

The designs for SMD MELF resistors are defined according to EN 140401-803 or according to DIN EN 140401-803, with the four-digit code, the DIN specifications for diameter and Bauteilänge defined in mm. The information subject to the tolerances of the respective manufacturers. The following data refer to the SMD MELF Resistors Vishay Beyschlag manufacturer.

Melf (MMB ) 0207 L = 5.8 mm, Ø = 2.2 mm ~ 1/3 Watt ( 0.4 W) 350 V MiniMelf ( MMA) 0204 L = 3.6 mm, Ø = 1.4 mm 1/4 watt (0.25 W) 200 V MICROMELF (MMU ) 0102 L = 2.2 mm, Ø = 1.1 mm 1/ 5 Watt ( 0.2 W) 100 V MICRO- MELF 0102 is compatible with chip 0805

• MINI- MELF 0204 is compatible with chip 1206

• MELF 0207 is compatible with the chip - design 2512

Similar designs

• Chip design