ECMF02-2AMX6

Recommendation on PCB assembly

Doc ID 17815 Rev 2

11/15

5

Recommendation on PCB assembly

5.1

Stencil opening design

1.

General recommendation on stencil opening design

a)

Stencil opening dimensions: L (Length), W (Width), T (Thickness).

Figure 21.

Stencil opening dimensions

b)

General design rule

Stencil thickness (T) = 75 ~ 125 µm

2.

Reference design

a)

Stencil opening thickness: 100 µm

b)

Stencil opening for leads: Opening to footprint ratio is 90%.

Figure 22.

Recommended stencil window position

L

T

W

Aspect ratio

W

T

-----

1.5

≥

=

Aspect area

LW

×

2T L

W

+

()

----------------------------

0.66

≥

=

236 µm

250µm

7 µm

15 µm

Stencil window

Footprint