Datasheet

 2010 Microchip Technology Inc. DS51194S-page 35
Transition Socket Specification
QFP TRANSITION SOCKET
QFP (MQFP, TQFP, PQFP) transition sockets and
associated hardware are shown below.
FIGURE 5: QFP TRANSITION SOCKET
The QFP transition socket is required for use along with
the QFP device adapter. The device adapter is
equipped with four socket strips that interface with the
transition socket.
The following QFP transition sockets have been
discontinued:
• XLT44PT: One 44-lead QFP transition socket,
0.80 mm
• XLT64PT1: One 64-lead QFP transition socket,
0.5 mm (PIC16C92X)
• XLT64PT2: One 64-lead QFP transition socket,
0.5 mm (PIC17CXXX)
• XLT64PT3: One 64-lead QFP transition socket,
0.8 mm (dsPIC30F)
• XLT64PT4: One 64-lead QFP adapter socket and
one 64-lead QFP header (0.8 mm)
• XLT80PT: One 80-lead QFP transition socket,
0.5 mm
QFP TRANSITION SOCKET
SOLDERING TIPS
• Before soldering, consider keeping the
break-away tabs in place during soldering.
• Use controlled soldering iron tip temperatures
between 300C and 325C (570F to 615F)
• If possible, use a PACE mini wave soldering iron
tip or an equivalent tip design.
• Plan to solder one (1 of 4) side first, then the
opposite side, then the remaining two sides.
• Soldering iron tip movement should be in the
direction of the leads (backward and forward), not
across the leads; dragging the tip across the
leads may cause lead damage.
• Use generous amounts of soldering flux to aid in
the solder flow action.
• If the break-away tabs are removed after solder-
ing (using a dental pick or equivalent), any solder
bridging between leads can be repaired by simply
gently touching the soldering tip to the lead tip.
XLT44PT (Discontinued – see XLT44PT3)
44-lead QFP to 0.8 mm Adapter Socket
Note: To avoid solder bridging, do not place vias
within 0.025-inch of the QFP footprint.
Also, any vias near the QFP should be
directly on the centerline of the pad.
Note: The XLT64PT1 for the PIC16C92X is not
symmetrical. Please note Pin 1 orientation
prior to soldering to the target system.
Cable to Processor Module
QFP Device Adapter
QFP Transition Socket
Target/Application Board
TOP
VIEW
1
ST92X
Pin 1
CAUTION
The 64 and 80-pin QFP headers are very delicate
and can be easily damaged!
0.90
TOP
VIEW
0.90
UNLESS OTHERWISE SPECIFIED, DIMENSIONS
ARE IN INCHES.
0.300
0.130
0.80
0.65
0.55
0.365
0.05
0.80 mm
SIDE
VIEW
FRONT/