HSP051-4N10 Datasheet, PDF (8/11 Pages) STMicroelectronics – 4-line ESD protection for high speed lines

Recommendation on PCB assembly
3
Recommendation on PCB assembly
HSP051-4N10
Figure 20. Recommended stencil window position
0,14
0,19
0,4 0,4
3.1
Solder paste
1. Use halide-free flux, qualification ROL0 according to ANSI/J-STD-004.
2. “No clean” solder paste recommended.
3. Offers a high tack force to resist component displacement during PCB movement.
4. Use solder paste with fine particles: powder particle size 20-45 µm.
3.2
Placement
1. Manual positioning is not recommended.
2. It is recommended to use the lead recognition capabilities of the placement system, not
the outline centering.
3. Standard tolerance of ± 0.05 mm is recommended.
4. 3.5 N placement force is recommended. Too much placement force can lead to
squeezed out solder paste and cause solder joints to short. Too low placement force
can lead to insufficient contact between package and solder paste that could cause
open solder joints or badly centered packages.
5. To improve the package placement accuracy, a bottom side optical control should be
performed with a high resolution tool.
6. For assembly, a perfect supporting of the PCB (all the more on flexible PCB) is
recommended during solder paste printing, pick and place and reflow soldering by
using optimized tools.
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