February 15, 2012
Acceptance Criteria for D-Pak Components
We are not sure about the acceptance criteria for D-Pak components whether end overhang is permitted or not. Is there a specific reference?
Is this covered in IPC-A-610?
J.O.
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The D-PAK is
covered in the IPC-A-610E in section 8.3.14 on page 8-94, "Components with
Bottom Thermal Plane Terminations". It is also covered in previous revisions of
the IPC-A-610. The criteria
for end over hand is "No Overhang" for all three classes. For the full
criteria, the IPC-A-610E is available through the webstore.
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Kris Roberson
Manager of Assembly Technology
IPC
Kris Roberson has experience as a machine operator, machine and engineering technician and process engineer for companies including Motorola, and US Robotics. Kris is certified as an Master Instructor in IPC-7711 / 7721, IPC A-610 and IPC J-STD 001.
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Reference IPC-A-610 Page
8-95, Section 8.3.14 Components with Bottom Thermal Plane Terminations. The End overhang of thermal
plane is not allowed; check the second bullet in the Defect Class 1, 2, 3
section.
Keep in mind that the end
face of the of the thermal plane may not be solderable due to the construction
of the device, so the solder joint would be on the bottom of the termination
only as shown on figure 8-175 on page 8-94. Hope
this is useful.
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Leo Lambert
Vice President, Technical Director
EPTAC Corporation
At EPTAC Corporation, Mr. Lambert oversees content of course offerings, IPC Certification programs and provides customers with expert consultation in electronics manufacturing, including RoHS/WEEE and lead free issues. Leo is also the IPC General Chairman for the Assembly/Joining Process Committee.
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