DocID15852 Rev 3

5/15

TN0107

Installation guide: heatsink mounting

15

Figure 3. Overtightening causes molding compound crack

Figure 4 shows the recommended fastening sequence to mount screws. ST recommends

setting torque at 0.2/0.3N

tight mounting screws, the suggested torque is 0.7 N

To reduce fastening process cycle time, two-steps permanently tightening is also possible:

If two-steps permanent tightening is applied, thermal grease may not evenly distribute

between the module and the external heatsink. In case of use of electrical or pneumatic

screwdriver, a revolution at 200 rpm max. is suggested, because a quick impact of screw

may damage the module plastic body.

Figure 4. Mounting screws: recommended fastening order

Molding compound crack

GIPG1406031450SA

GIPG1406031528SA