Process recommendations

MP34DT05

12/21

DocID029902 Rev 1

5

Process recommendations

To ensure a consistent manufacturing process it is strongly advised to comply with

following recommendations:

•

The recommended pick-up area for the MP34DT05 package must be defined using

the worst case (ie. no device alignment during picking process). This area has been

defined considering all the tolerances of the components involved (reel, package,

sound inlet). Picker tolerance shall be considered as well.

•

To prevent damage to the MEMS membrane or incorrect pick-up and placement, do

not pick up the component on the inlet area

•

For the package outline please refer to Figure 7: "Carrier tape with microphone (top

view)". Nozzle shape, size, and placement accuracy are the other key factors to

consider when deciding on the coordinates for the picking.

•

Device alignment before picking is highly recommended.

•

A vacuum force greater than 7 psi must be avoided

•

1 kPa = 0.145 psi (lb/in²) = 0.0102 kgf/cm² = 0.0098 atm

•

MSL (moisture sensitivity level) Class 3

•

Maximum of 3 reflow cycles is recommended

•

All recommended dimensions (device safe-picking area) do not include the pick-and-

place equipment tolerances

Figure 8: Recommended picking area

To have a safe pick-up "by design", ST strongly advises an ad hoc nozzle.

The following picker ensures that the holes for the vacuum and the air stream are ALWAYS

away from the porthole of the device (4 vacuum ports located at each corner of the device).

The recommended nozzle also has a recess, in the form of a cross, which guarantees that

the porthole is always left at atmospheric pressure. By using the recommended nozzle, the

membrane will not suffer any sudden air disturbances during the picking or placing of the

devices in the tape and reel.