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February 1998

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Subject:
From:
Jack Crawford <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 10 Feb 1998 17:31:34 -0600
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The term "castellated" is used to define a physical characteristic of Leadless Chip
Carriers. Most LCCs have grooves on the sides of the LCCs, starting at the bottom and
located in conjunction with each of the solder pads on the bottom of the component.
They typically extend nearly all the way up the side of the component and are
typically plated with a solderable metal all or nearly all the way to the top of each
groove.  When the component is soldered in place, it is desirable to have fillets
form from the PCB pad about half way up these "castellations."

There are good pictorial representations in the ANSI/J-STD-001B, page 25, Figure
9-10, and IPC-A-610 clause 10.2.4 starting on page 115, including Figures 10-34
through 10-41.  Jack

Jack Crawford, IPC Project Manger - Assembly
2215 Sanders Road, Northbrook IL  60062-6135
[log in to unmask]        http://www.ipc.org
847-509-9700 x 393
fax 847-509-9798

>>> <[log in to unmask]> 02/10/98 12:22PM >>>
Can someone please give me a definition of "castellated" in regards to
Surface Mounted Components.  My dictionary just refers to battlements
and supporting castles.

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