71M6521DE Datasheet, PDF (97/101 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
Recommended PCB Land Pattern for the QFN-68 Package
Recommended PCB Land Pattern Dimensions
Symbol
e
x
y
d
A
G
Description
Lead pitch
Pad width
Pad length, see note 3
See note 1
Typical
Dimension
0.4mm
0.23mm
0.8mm
6.3mm
6.63mm
7.2mm
Note 1: Do not place unmasked vias in region denoted by dimension “d”.
Note 2: Soldering of bottom internal pad is not required for proper operation.
Note 3: The ‘y’ dimension has been elongated to allow for hand soldering and reworking. Production assembly may allow this
dimension to be reduced as long as the ‘G’ dimension is maintained.
v1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
Page: 97 of 101