Inductor Coil Application Notes

In China, there are many inductor suppliers and professional toroidal inductor suppliers. Most factories could provide high power inductor free samples. If you want to buy inductor coils you should know the inductor coil application. This article will give you a clear Inductor coil application otes.

Inductive Material Analysis Inductor Application Notes

1.Storage condition

In order to maintain the solderability of the Stirnelektrode:

(1) Temperature and humidity conditions are less than 40 ° C and 70% RH.

(2) It is recommended that the ceramic chip inductor be used within 6 months.

(3) Packaging materials should avoid the environment of chlorine and sulfur.

2. Carry

(1) The tweezers and vacuum components used are recommended to be separated from other components.

(2) When handling in bulk, much attention should be drawn to minimize friction and mechanical shock.

(3) The wafer ceramics are electrically inductively handled to avoid damage and skin oil contamination.

3. The design of the Land Pattern

The electrode padding of should be designed to achieve good solder coating and reduce component movement during reflow. The following is a soldering pad design for wave soldering or reflow soldering of the most common multilayer ceramic sizes. The basics of these designs are as follows:

(1) The width of the soldering mat is the same as the width of the component. Reducing to 85% of the component width is allowed, but it is not wise to reduce it more.

(2) The welding mat overlaps the bottom of the component by 0.5 mm.

(3) For reflow, the welding mat extends out of the component by 0.5 mm; the wave soldering is 1.0 mm more.

(4) Component spacing:

For wave soldered components, there must be sufficient spacing to prevent the solder from completely penetrating the small space. Intervals are less important for reflow, but there are still enough intervals to prevent heavy work.

4. Preheating

The possibility of avoiding thermal shocks during welding is important, so preheating is necessary. The temperature rise of the preheating should not exceed 4 ° C / sec, the recommended value is 2 ° C / sec. Although a temperature difference of 80 ° C to 120 ° C is common, recent studies have shown that it is feasible to vary the surface temperature of the component and the soldering temperature by up to 150 ° C for a 1210-sized component with a thickness of less than 1.25 mm. Users should be aware that thermal shock increases as component size or temperature increases.

5. Solderability

A good weld can be obtained by immersing the end face in a 235 ± 5 ° C 60/40 tin/lead tin furnace for 2 ± 1 seconds.

6. Flux selection

Since the flux has a great influence on the surface of the component, the following conditions should be confirmed before use:

(1) The amount of flux should be less than or equal to 0.1% by weight of the halide (corresponding to chlorine content). Flux containing strong acid should be avoided.

(2) When soldering components to the substrate, the amount of flux used should be controlled to an optimum level.

(3) When using water-soluble flux, special attention should be paid to the cleaning of the substrate.

7. Welding

Activating mild rosin fluxes is welcome. Use a minimum amount of flux as much as possible with the good combination that can be obtained. Excessive solder can cause stress damage due to differences in expansion coefficients between solder, wafer, and substrate.

8. Welding

(1) Reflow

(2) Wave soldering

Wave soldering is perhaps the most demanding surface soldering process because there is a steep temperature rise when immersed in a molten solder wave, typically 240 °C. Wave soldering of ceramic laminated inductors larger than 1812 size, because of the risk of damage to the inductor due to thermal shock. Therefore, it is not encouraged.

(3) Soldering iron

Soldering of ceramic inductors with soldering irons is not encouraged as it is subject to inherent process limitations. If you must use a soldering iron, it is recommended to pay attention to the following points.

· Preheat the line and resistance to 150 °C.

· The tip of the soldering iron must not touch the ceramic.

• Use a soldering iron with a power of 20 watts and a soldering iron tip diameter of 1.0 mm.

• The tip of the soldering iron has a maximum temperature of 280 °C.

·The tip diameter of the soldering iron is up to 1.0mm

· Welding time is less than three seconds.