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1. The inductance and the margin of error

Inductance refers to the product specification required by the frequency of measuring the inductance of the nominal value.Inductance is the Henry (H), heng (mH), micro heng (uH), heng (nH) as the unit of quantity, error is subdivided into: F (+ / - 1%);G level (+ / - 2%);Class H (+ / - 3%);

J level (+ / - 5%);K level (+ / - 10%);L (+ / - 15%);M class (+ / - 20%);P level (+ / - 25%);N level

(+ / - 30%);The most commonly used is J, K, M class.

 

2. The dc resistance

Except the power inductor dc resistance (check only wire specifications), other inductors shall require the largest dc resistance according to the requirement, and generally as small as possible.

 

3. The maximum working current

Take inductor current rating of 1.25 ~ 1.5 times as the maximum working current, the general should use derating 50% safe.

 

4. The stability of the inductance

Inductor because 1 ℃ environment temperature changes produced by the change of the inductance delta L/delta t and the ratio of the original inductance L value for the temperature of the inductance is a1, a1 = delta L/L * delta t.In addition to the temperature coefficient can decide the stability of inductor, also should pay attention to due to mechanical vibration and led by aging

The change of the inductance.

 

5. The electric strength and moisture

There is a requirement for the electric strength for inductors should choose the variety of packaging material resistant to high voltage, good pressure inductor, moistureproof performance is better also.Using resin impregnation, coating, die casting technology can meet the requirements.

 

6. Bonding pad or stitching

Bonding pad or stitching is to choose and use the important direction of inductance coil can not be ignored, the main assessment of the pulling force, torque, high welding heat and weldability test, etc., to ensure the reliability of the welding.

For SMT inductance (SMD) must be in strict accordance with the design of bonding pad size of choose and buy, the inductance with pins, there is no strict rules with parameters and vertical, horizontal interchangeable, just due to the PC board installation position limit specified varieties.

 

7. The patch element of packing

All use bearing belt to avoid collision and extrusion, based on the SMT SMT homework with packing requirements for loading, weight of the heavier components must be encapsulated with heat sealing belt as on the belt.