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The solution to the Pogo pin tip of the FT is hanging tin on the top, which causes the test yield to decrease

Issuing Time:2020-09-24Release:SHENZHEN ZHongZHengTian Technology Co., Ltd.

  During the test, the Pogo pin needle often comes into contact with the solder balls or pins, and the tin hanging condition is unavoidable. The current method to solve this problem can be effectively controlled by changing the needle coating material.

  

  Regarding the coating of Pogo pin needles, most of the materials currently used are Au materials. The adhesion of Au to Sn is relatively strong. In order to solve the problem of the material characteristics, Pdco materials can be used instead of Au. Pdco is also the same It is also a kind of precious metal. Compared with gold, it has the following material properties.

  

  (1) Hardness

  

  Pdco has a hardness of 450HV

  

  Au has a hardness of 200HV

  

  The surface hardness of Pdco is higher than that of Au, which makes Pdco have better wear resistance than Au

  

  (2) friction

  

  The friction coefficient of Pdco is .40

  

  Au has a friction coefficient of .65

  

  The lower friction coefficient can help the needle move more smoothly in the tube wall

  

  (3)Particle size

  

  Pdco size is 50-150 Angstroms

  

  The particle size of   Au is 200-250 Angstroms = 0.000000000001 meters

  

  Small particles are more difficult to cause surface oxidation

  

  (4) Toughness

  

  Pdco: 3-7% elongation

  

  Au: <3% elongation

  

  Stronger surface toughness Under the collision of the needle and the contact, the surface is less prone to cracks.

  

  From the above data, we can see that Pdco is superior to Au in terms of material properties. But all materials are not perfect, the most important aspect of resistance is Au is indeed higher than Pdco!

  

  (5) Resistance (data obtained by the same number of times of use under the same needle, different plating test environment)

  

  Au 19mΩ

  

  Pdco 26mΩ

  

  If you encounter products that are more sensitive to impedance data, the test yield of Au is lower than that of Pdco.

  

  To sum up, aiming at the respective characteristics of Pdco and Au. KITA has developed a new coating alloy that combines the characteristics of the two materials 2-2

  

  In terms of electrical resistance, the data of alloy 2-2 is very close to the data of Au, and at the same time it can get the same tin-free characteristics as Pdco, and the material hardness is higher than Au and Pdco.

  

  Contrast hardness:

  

  The hardness of Alloy2-2 is 680HV

  

  Pdco has a hardness of 450HV

  

  Au has a hardness of 200HV

  

  In Alloy 2-2, 4 layers of gold are covered on the basis of raw materials to achieve the required performance.

  

  Therefore, the new alloy 2-2 coating can be used to effectively improve the problem when the degree of tin hanging is relatively high. For more information about 2-2, please contact the engineer.


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