Transition Socket Specification

DS51194P-page 20

© 2006 Microchip Technology Inc.

RECOMMENDED INSTALLATION OF

TRANSITION SOCKETS WITH

CABLES

For transition sockets that use a cable, follow these

instructions for installing your transition socket on the

target board.

PCB Layout Considerations:

Make sure you leave enough room on the PCB to

accommodate the cable, i.e., space your target pads

for each device far enough apart so that the cable from

one pad group will not interfere with another pad group.

6-Pin SOT Solder Instructions:

1.

Remove protective cable covering from end of

cable.

2.

Position cables on target board (see below).

Tape down to prevent movement.

3.

Solder each lead to target pad.

4.

Remove tape and clean.

8-Pin DFN Solder Instructions:

1.

Prepare leads by trimming narrowest portion to

0.10-inch maximum in length (see below).

2.

Position cables on target board (see below).

Tape down to prevent movement.

3.

Solder each lead to target pad.

4.

Remove tape and clean.

8-Pin DFN Assembly Instructions:

1.

Start with cable associated with pin 1.

2.

Fold cable up and over, forming a radius.

3.

Mate with the header on the side of the transition

socket assembly, making sure pin 1 mates with

the pin labeled “DFN Pin 1”.

4.

Fold over and mate the other cable.

16-Pin QFN Solder Instructions:

1.

Remove protective cable jacket from stripped

end of cable.

2.

Lay out the four cables in a “+” pattern (see

below).

3.

Center each cable on the footprint (see below).

Tape down each cable to prevent movement.

4.

Solder each lead to target pad.

5.

Remove tape and clean

16-Pin QFN Assembly Instructions:

1.

Start with cable associated with pin 1.

2.

Fold cable up and over, forming a radius.

Header pins will now be facing upwards.

3.

Mate with the socket on the underside of the

transition socket assembly, making sure pin 1

mates with the pin labeled “QFN Pin 1”.

4.

Fold over and mate the other cables.

28/44-Pin QFN Solder Instructions:

1.

Remove protective cable jacket from stripped

end of cable.

2.

Lay out with long cables opposing each other

and short cables opposing each other (see

below).

3.

Place center lead (6th lead for 44-pin, 4th lead

for 28-pin) on center target pad to center each

cable on the footprint (see below). Tape down

each cable to prevent movement.

4.

Solder each lead to target pad.

5.

Remove tape and clean

28/44-Pin QFN Assembly Instructions:

1.

Start with cable associated with pin 1.

2.

Fold cable up and over, forming a radius.

Header pins will now be facing upwards.

3.

Mate with the socket on the underside of the

transition socket assembly, making sure pin 1

mates with the pin labeled “QFN Pin 1”.

4.

Fold over and mate the other cables.

pin 1

trim leads

pin 1

pin 1

header pins

facing down

center cable

on target footprint

pin 1

use center lead

to center cable

on target footprint

short

short

header pins

facing down