XLT20QFN-1 Microchip Technology, XLT20QFN-1 Datasheet - Page 17

• Manufacturer Part Number: XLT20QFN-1
• Description: SOCKET TRANSITION 20DIP-20QFN
• Manufacturer: Microchip Technology

Specifications of XLT20QFN-1

• Module/board Type: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MPLAB™ICE
• For Use With: DVA1004 - DEVICE ADAPTER 8/14/20DIP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PLCC TRANSITION SOCKET
A PLCC transition socket and associated hardware is
shown in Figure 4.
FIGURE 4: PLCC TRANSITION SOCKET
The PLCC transition socket is required for use along
with the PLCC device adapters. The DAF18-1 device
adapter is equipped with eight socket strips that inter-
face with one of two transition sockets. The DAF18-3
device adapter is equipped with four socket strips that
interface with one transition socket.
The PLCC transition sockets are designed with a
threaded insert in the center of the footprint so that a
4/40 screw can securely fasten the transition socket to
the device adapter.
The PLCC transition sockets are designed to be sol-
dered to the target PCB PLCC surface mount pattern or
inserted into a PLCC socket on the target PCB.
Microchip offers the following PLCC transition sockets:
• XLT44L2: One 44-lead PLCC transition socket
RECOMMENDED PCB LAYOUT
© 2008 Microchip Technology Inc.
Note:
0.024”
To avoid solder bridging, do not place vias
within 0.025-inch of the PLCC footprint.
Also, any vias near the PLCC should be
directly on the centerline of the pad.
0.050”
PLCC Transition Socket
0.865”
PLCC Device Adapter
Cable to Processor Module
Target/Application Board
Transition Socket Specification
0.074”
XLT44L2
44-lead PLCC (0.050”)
*Caution: Pin 1 on the device adapter side (top of socket)
is 180 degrees from pin 1 on the target side (bottom of
socket).
1.27mm typ. [0.050”]
21.93mm
[0.863”]
1.27mm typ. [0.050”]
2.79mmx45° [0.110”]
27.94mm [1.100”]
TOP VIEW
FRONT/SIDE
VIEW
0.43mm typ. [0.017”]
DS51194Q-page 15
20.32mm
[0.800”]
14.94mm
[0.588”]
27.94mm
[1.100”]