Neil,

I've used most of these panasonic resistor arrays, though not
specifically the V4V and V8V.  And I agree, one of the most confusing
data sheets ever.  The key here is that they only dimension (in a most
unhelpful, mechanical engineering way) the 'red' area - that's your pad
area; and note that the package 'fits' on those pads with sufficient toe
area.  The extension in the cross-hatched area is probably some drafters
idea of being helpful, indicating that the pads could extend farther for
testing or solder access.  They don't mention solder mask, so normal
solder mask swell applies.

An earlier version of this same data sheet had a near-fatal pitch error
on the footprint, but you've got the newer corrected one.

Gary Crowell
Micron Technology

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of nabble_dude
> Sent: Saturday, August 05, 2006 9:52 AM
> To: piclist@mit.edu
> Subject: [EE] Land pattern confusion
> 
> 
> Hey all,
> 
> This is Picdude, operating under a different name until I 
> figure out why I
> can't get piclist emails still.
> 
> Trying to figure out what exactly is the required land pattern for a
> resistor array, using the datasheet.  The datasheet is 
> http://www.panasonic.com/industrial/components/pdf/aoc0000ce1.
> pdf here  ,
> but for simplicity, I've cut and pasted sections from the 
> datasheet and put
> it  www.narwani.net/neil/stuff/Panasonic-V8V-DS-Q.gif here .
> 
> The sections are separated by the purple lines.  The first shows the
> recommended land patterns, and the second shows the component 
> dimensions. 
> In the third section, I've copied the land pattern diagram 
> and coloured in
> some sections.  From the dimensions specified, it would 
> appear that the red
> section is the actual pad, but then what is the yellow 
> section?  And in
> general what is the blue section?
> 
> Cheers,
> -Neil.
> 
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> 
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