01005s and Lead-Free Solder

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Remember when the 0402 was the smallest passive component you had to worry about? That part's dimensions-1 millimeter long, 0.5 millimeter wide, and 0.35 millimeter thick-were cake compared with the latest chip to come off the reel, the 01005.

An 01005 measures just 0.4 millimeter long, 0.2 millimeter wide, and 0.13 millimeter thick. A thousand 01005s weigh just 0.04 gram, and 16 of them can fit inside an 0402! The 01005 is also more expensive than its larger cousins.

Assembling these tiny, expensive resistors and capacitors presents some design and assembly challenges, particularly for lead-free products. Engineers must pay close attention to board design, component selection, stencil design, solder paste composition, board handling, printing, placement, reflow and inspection.

Kingsheng PCBA Tech could assembly these tiny parts and has been providing PCB Assembly service for a decade of years. We provide flexble electronic manufacturing service with BGA inspection and repairing. Our aim is to meet customers' satisfaction by best quality and professional service.

It has become increasingly popular to use very small passive components, with a size of 01005 (10 x 5 mil or 0.25 x 0.125 mm), and lead-free assembly together. However, assembling these tiny components can be quite challenging, which is why there is a strong need to develop a process that is optimized for this purpose. Even though we hear a lot about “01005s”, we can still underestimate just how small they really are. For example, their width is only slightly larger than the thickness of a human hair, and their length is about the thickness of a sheet of resume paper. Figure 1 shows the size comparison of different components.