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Small common sense of SMD inductor electrodes
2022-01-17
 
Chip inductors have the characteristics of high saturation, high reliability, high precision, and miniaturization, making them unique in the fields of consumer electronics, digital products, and automotive electronics. As electronic products continue to develop in the direction of miniaturization, light weight, and high performance, higher requirements are placed on the reliability and integrated design of chip inductors. SMD inductors are mainly composed of three parts: coils, magnetic cores and electrodes. Among them, the design of the electrode is a key factor affecting the solderability, solder resistance and integrated design of the inductor.

1. The role and evaluation of electrodes
The electrode mainly plays the role of conducting the inductor coil and electronic components in the inductor. Therefore, the solderability, solderability and high reliability of the electrode should be considered in the design of the chip inductor.

    At present, common methods for evaluating electrode characteristics mainly include: solderability test, welding heat resistance test, bending strength test, terminal electrode adhesion test, drop test, whisker test, vibration test, and terminal strength test.

Second, the advantages and disadvantages of various electrode designs

 SMD inductor electrodes can be divided into L-shaped electrodes, I-shaped electrodes, bottom electrodes, and terminal electrodes according to their shape.


L-shaped electrode

       Advantages: The terminal is simple to form and the shape of the pad is regular, which can meet various PBC designs; the heat dissipation of the side electrodes is increased, and the heat dissipation performance is excellent; the plating layer is uniform and the patch reliability is high.

       Disadvantages: The gap of the side inductance needs to be considered in the PCB design to avoid the phenomenon of tin connection; the same size, the size margin of the side electrode needs to be considered, and the utilization rate of the magnet is low.

Type I electrode

       Advantages: The shape of the pad is regular, suitable for various PBC designs; the same product, the pad area is smaller; for large-sized inductors, I-shaped electrodes are designed, and other small-sized inductor components can be arranged under the inductor, saving the lateral space of the PCB .

      Disadvantages: the increase of the DCR of the inductance increases the copper loss of the inductance; the precision of the inductance flatness is high.

bottom electrode

       Advantages: Inductors mostly use coil tails to lead directly to the bottom of the product as electrodes, which are in direct contact with the pads, with no risk of open circuit and high reliability; there is no side electrode, which can avoid short-circuiting of components connected to the PCB, and the side gap is smaller. It is beneficial for the module to be miniaturized.

       Disadvantages: The electrode adhesion is weak; the electrode is easily oxidized, and the risk of inductance erection is high.

terminal electrode

     Advantages: Inductor design is not limited by size and structure design, and is mostly used for laminated and thin-film chip inductors; the chip method is not limited, and surface mounting in multiple directions can be realized.

    Disadvantages: The continuity of the coating is not easy to control, and the process requirements are high; the internal stress between the coatings is large, the coating is easy to peel off, and the process requirements are high.

3. The trend of future design

The design of the inductive electrode should consider the upstream and downstream manufacturing lines, starting from its own core, to meet the requirements of intelligent, highly integrated, and green production. Therefore, the design of the inductive electrode should be miniaturized, high-precision, high-reliability, close to the The net manufacturing direction is close.

 
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