Chip mounting method. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Many radio amateurs use a universal breadboard with a 2,5 mm hole pitch to mount their devices. Mounting on such a board microcircuits with a planar pin arrangement with a pitch of 1,25 mm is difficult, therefore, microcircuits of the K133, K134, K136, 564 and similar series are used very rarely. To use them, it is necessary to develop and manufacture printed circuit boards, which is unjustified in the case of single products, or to use adapter boards, which is also quite laborious.
Fig. 1
Fig. 2
The proposed method of mounting such microcircuits avoids such difficulties.
In the prototyping board, at the location of the microcircuit, additional holes with a diameter of 0,7-0,8 mm are drilled in the gaps between the existing pads. The microcircuit leads are formed - bent at a right angle in an alternating manner, with a minimum radius and a radius of 1,5 mm.
The microcircuit is placed on a breadboard, and the leads passed into the newly drilled holes are bent from the reverse side of the board and brought to the nearest free contact pads. On fig. Figure 1 shows a fragment of a breadboard with a mounted chip in a 401.14-4 (chip dimensions 10x6,5x2,3 mm) or 401.14-5 (10x6,7x1,97 mm) case, in fig. 2 - in case 402.16 (11,5x9,3x2,5 mm).
Further, the connections are made, as usual, with tinned wire with a diameter of 0,2-0,4 mm and MGTF 0,07.
If a universal prototyping board with double-sided contact pads with metallized holes is used, then varnished cloth strips must be glued to the base of microcircuits in glass-metal and metal-ceramic cases to prevent shorting of the contact pads located under the microcircuit case.
Author: K. Moroz
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