XLT44QFN [MICROCHIP]
Transition Socket Specification; 转换插座规格
| 型号： | XLT44QFN |
| 厂家： | 
MICROCHIP |
| 描述： | Transition Socket Specification |
| 文件： | 总4页 (文件大小：140K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Transition Socket Specification
FIGURE 10: DFN TRANSITION SOCKET WITH
SOT/DFN/QFN TRANSITION
SOCKETS
CABLE
Cable to Processor Module
PDIP Device Adapter
SOT/DFN/QFN transition sockets and associated
hardware are shown below.
FIGURE 7: SOT TRANSITION SOCKET WITH
CABLE
Gold Standoffs/
Adapters
Cable to Processor Module
PDIP Device Adapter
DFN Transition Socket
Cables
Target/Application Board
Gold Standoffs/
Adapters
SOT Transition Socket
FIGURE 11: QFN TRANSITION SOCKET WITH
CABLE
Cables
Target/Application Board
Cable to Processor Module
PDIP Device Adapter
FIGURE 8: DFN/QFN TWO-PART
TRANSITION SOCKET
Gold Standoffs/
Adapters
Cable to Processor Module
QFN Transition Socket
PDIP Device Adapter
Cables
Gold Standoffs/
Adapters
Target/Application Board
DFN/QFN Transition Socket
Target/Application Board
Microchip offers the following SOT/DFN/QFN transition
sockets:
• XLT06SOT: One 6-lead SOT transition socket
with cable
FIGURE 9: QFN TRANSITION SOCKET
• XLT08DFN: One 8-lead DFN two-part transition
socket
Cable to Processor Module
PDIP Device Adapter
• XLT08DFN2: One 8-lead DFN transition socket
with cable
• XLT16QFN1: One 16-lead QFN transition socket
with cable
Gold Standoffs/
Adapters
• XLT28QFN3: One 28-lead QFN transition socket
with cable
QFN Transition Socket
Target/Application Board
• XLT28QFN4: One 28-lead QFN transition socket
with cable
• XLT44QFN2: One 44-lead QFN transition socket
with cable
• XLT44QFN3: One 44-lead QFN transition socket
with cable
The following sockets have been discontinued:
• XLT28QFN: One 28-lead QFN transition socket.
(Replaced by XLT28QFN4.)
• XLT28QFN2: One 28-lead QFN transition socket.
(Replaced by XLT28QFN3.)
• XLT44QFN: One 44-lead QFN two-part transition
socket. (Replaced by XLT44QFN2.)
See the drawings in this section for layout dimensions.
© 2006 Microchip Technology Inc.
DS51194P-page 19
Transition Socket Specification
3. Center each cable on the footprint (see below).
RECOMMENDED INSTALLATION OF
TRANSITION SOCKETS WITH
CABLES
Tape down each cable to prevent movement.
4. Solder each lead to target pad.
5. Remove tape and clean
For transition sockets that use a cable, follow these
instructions for installing your transition socket on the
target board.
center cable
on target footprint
pin 1
PCB Layout Considerations:
header pins
facing down
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:
16-Pin QFN Assembly Instructions:
1. Remove protective cable covering from end of
cable.
1. Start with cable associated with pin 1.
2. Position cables on target board (see below).
Tape down to prevent movement.
2. Fold cable up and over, forming a radius.
Header pins will now be facing upwards.
3. Solder each lead to target pad.
4. Remove tape and clean.
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.
pin 1
2. Lay out with long cables opposing each other
and short cables opposing each other (see
below).
8-Pin DFN Solder Instructions:
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.
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.
4. Solder each lead to target pad.
5. Remove tape and clean
3. Solder each lead to target pad.
4. Remove tape and clean.
use center lead
to center cable
on target footprint
pin 1
trim leads
pin 1
header pins
facing down
short
short
8-Pin DFN Assembly Instructions:
1. Start with cable associated with pin 1.
2. Fold cable up and over, forming a radius.
28/44-Pin QFN Assembly Instructions:
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”.
1. Start with cable associated with pin 1.
2. Fold cable up and over, forming a radius.
Header pins will now be facing upwards.
4. Fold over and mate the other cable.
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”.
16-Pin QFN Solder Instructions:
1. Remove protective cable jacket from stripped
end of cable.
4. Fold over and mate the other cables.
2. Lay out the four cables in a “+” pattern (see
below).
DS51194P-page 20
© 2006 Microchip Technology Inc.
Transition Socket Specification
XLT06SOT
RECOMMENDED PCB LAYOUT
6-lead SOT-23 to 0.80-inch Adapter Socket
The recommended target board footprint layout for
different pin-counts is shown here.
0.80
FIGURE 12: 6-PIN SOT, 8-PIN DFN
0.90
50 mils
16 mils
24 mils
TOP
VIEW
0.30
FIGURE 13: 16-PIN QFN
1.50
SIDE
VIEW
24 mils
UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE
IN INCHES.
11 mils
26 mils
XLT08DFN2
8/14-lead DIP to 0.025-inch Adapter Socket
FIGURE 14: 28-PIN QFN
DVA Pin 1: Location of 8- or 14-lead DIP pin 1
1.35
DVA Pin 1
DFN Pin 1
24 mils
0.30
0.90
11 mils
26 mils
2.37
FIGURE 15: 44-PIN QFN
0.24
TOP
VIEW
0.30
16 mils
13 mils
26 mils
0.09
SIDE
VIEW
UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE
IN INCHES.
© 2006 Microchip Technology Inc.
DS51194P-page 21
Transition Socket Specification
Multi-lead DIP to 0.025-inch Adapter Socket Cables
XLT16QFN1, XLT28QFN3, XLT28QFN4,
XLT44QFN2, XLT44QFN3
0.85
Multi-lead DIP to 0.025-inch Adapter Socket
TOP
XLT16QFN1 – 14-lead DIP
1.25
0.40
0.40
VIEW
QFN Pin 1
SIDE
VIEW
1.15
TOP VIEW
BOTTOM
VIEW
XLT28QFN3 – 18-lead DIP (shown here)
XLT28QFN4 – 28-lead DIP
C
2.45
QFN Pin 1
cable
1-4
C
1.30
1.30
2.00
1.30
2.00
1.15
XLT16QFN1
XLT28QFN3/4 1,2
3,4
XLT44QFN2/3 1,2
3,4
TOP VIEW
XLT44QFN2 – 40-lead DIP (shown here)
XLT44QFN3 – 44-lead DIP
UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE
IN INCHES.
2.45
Drawing shown is for 28-lead DIP.
1.15
QFN Pin 1
TOP VIEW
0.56
FRONT/BACK
VIEW
UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE
IN INCHES.
DS51194P-page 22
© 2006 Microchip Technology Inc.
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