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Products > Packages > Outline drawing information >

Reference symbols and dimension examples for QFP


Reference symbols and dimension examples for IC package outline drawings

Reference symbols and dimension examples for QFP

Figure:Reference symbols and dimension examples for QFP


Terminology Reference Symbol Description
Nominal dimensions D * E Combination of package length D and package width E
Package length D Length of package body
Package width E Width of package body
Overall length HD Dimension including the peripheral terminal length with regard to the package length direction
Overall width HE Dimension including the peripheral terminal length with regard to the package width direction
Seating plane S The surface determined when the package is placed on a horizontal surface
Seated height A Height from seating plane to top edge of the package body
1st standoff height A1 Height from seating plane to base plane (bottom edge of package body)
Package height A2 Height from base plane to top edge of package body
Standard height of soldered point A3 Standard height 0.25mm from seating plane
Terminal pitch e Logically correct distance between terminal center positions
Terminal width b Width of each terminal(including plating)
Terminal thickness c Thickness of each terminal(including plating)
Length of flat part of terminal L Effective projected length of flat part of terminal
Length of soldered part Lp Effective projected length of terminal attachment defined by standard height of soldered part
Terminal length L1 Length from terminal edge to package body, projected to seating plane
Tolerance value of terminal center position x Deviation from location where each terminal center should be -
Maximum Material Condition (MMC) applies
Terminal coplanarity y Maximum deviation in vertical direction between each terminal bottom surface and seating plane.
Terminal uniformity angle Angle between flat part of terminal and seating plane
Lengthwise overhang ZD Distance from center of terminal at extreme edge of lengthwise direction to package edge
Widthwise overhang ZE Distance from center of terminal at the extreme edge of widthwise direction to package edge