There are four main types of chip inductors, namely wire-wound inductors, laminated, woven and thin-film chip inductors. Two types of wire-wound type and laminated type are commonly used. The former is a miniaturized product of traditional wire-wound inductors, while the latter is made using multi-layer printing technology and laminated production technology. The volume is smaller than that of wire-wound chip inductors. It is a key product developed in the field of inductive components.
1. Winding type
It is characterized by a wide range of inductance, high inductance accuracy, low loss (that is, large Q), large allowable current, strong manufacturing process inheritance, simplicity, and low cost, but the disadvantage is that it is limited in further miniaturization. . Ceramic core winding inductors can maintain a stable inductance and a relatively high Q value at such a high frequency, and thus occupy an important position in the high-frequency loop.
The winding point of TDK's NL series is 0.01-100uH, the accuracy is 5%, and the high Q value can meet general needs.
NLC type is suitable for power circuit, rated current can reach 300mA; NLV type is high Q value, environmentally friendly recycled plastic, can be interchanged with NL, NLFC has a magnetic screen, suitable for power lines.
2. Laminated type
It has good magnetic shielding, high sintering density and good mechanical strength. The disadvantages are low pass rate, high cost, small inductance, and low Q value.
Compared with wire wound chip inductors, it has many advantages: small size, which is conducive to miniaturization of the circuit, closed magnetic circuit, will not interfere with surrounding components, and will not be interfered by neighboring components, which is beneficial to components High-density installation. Integrated structure, high reliability, heat resistance, good solderability, regular shape, suitable for automatic surface mounting production.
TDK's MLK inductors have small size, good solderability, magnetic screens, high-density design, monolithic structure, and high reliability. The MLG type has a small inductance and uses high-frequency ceramics, which is suitable for high-frequency circuits. MLK type working frequency is 12GHz, high Q value, low inductance value 1n-22nH.
3. Thin film type
It has the characteristics of maintaining high Q, high precision, high stability and small size in the microwave frequency band. The internal electrodes are concentrated on the same layer, and the magnetic field distribution is concentrated, which can ensure that the device parameters after mounting do not change much, and show good frequency characteristics above 100MHz.
The characteristic is that the inductance per unit volume at 1MHz is larger than other chip inductors, and it is small in size and easy to install on the substrate. Used as a miniature magnetic component for power processing.
In actual applications, the application should be selected according to the situation, the application effect should be considered, and the material cost should also be considered.