How Would You Create The TI RSE Package?

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So, I think the TI RSE package ( http://www.ti.com/lit/ds/scds285a/scds285a.pdf ) is modeled after a QFN package.  In fact, I started from the TI RKT package in the standard library and modified it to the datasheet.

However, the datasheet shows pins 8 and 4 with a different Lxb pad than the other six pads.

I know I can export a CAD output with all pads set to one size, change the pad dims to match those of pads 4 and 8, export again, and cut-n-paste between the two files.  However, I am hoping there is an easier way that I haven't discovered.

Thanks,
Billy

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Evenkeel Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 13 Dec 2012 Location: USA Status: Offline Points: 145	Post Options Post Reply Quote Evenkeel Report Post Thanks(0) Quote Reply Topic: How Would You Create The TI RSE Package? Posted: 27 Dec 2012 at 12:20am
	So, I think the TI RSE package ( http://www.ti.com/lit/ds/scds285a/scds285a.pdf ) is modeled after a QFN package. In fact, I started from the TI RKT package in the standard library and modified it to the datasheet. However, the datasheet shows pins 8 and 4 with a different Lxb pad than the other six pads. I know I can export a CAD output with all pads set to one size, change the pad dims to match those of pads 4 and 8, export again, and cut-n-paste between the two files. However, I am hoping there is an easier way that I haven't discovered. Thanks, Billy



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5717	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 27 Dec 2012 at 10:09am
	Manually. Or build the part with 1 pad width an length and then change it in the CAD tool library editor. This QFN has 3 different lead widths, 0.20 mm, 0.25 mm and 0.30 mm. It also has two different lead lengths. The PCB Footprint Expert will be able to handle this package when we release the upcoming "Footprint Editor" module. It will allow any combination of lead widths and lengths as you will create the "mfr. recommended footprint" and save it away in a .FPT file format. The "Footprint Editor" for unique surface mount packages is coming out in Q2 2013. This module is "beyond IPC standard component technology" and to be used exclusively for non-standard parts.

Evenkeel Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 13 Dec 2012 Location: USA Status: Offline Points: 145	Post Options Post Reply Quote Evenkeel Report Post Thanks(1) Quote Reply Posted: 27 Dec 2012 at 10:42am
	Thanks. Sometimes you have an insightful way to use the FPX tool to create parts that was not immediately apparent so I figured I would ask. However, I find that using the tool to create the basic part and then tweak it in the CAD tool editor gets me way up on the library consistency curve. Sure beats having to do each step manually. Look forward to the Footprint Editor! Billy