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October 2000

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From:
"Lam, Patrick" <[log in to unmask]>
Date:
Wed, 11 Oct 2000 09:36:10 -0700
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1.0
X-To:
Phil Bavaro <[log in to unmask]>
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"TechNet E-Mail Forum." <[log in to unmask]>, "Lam, Patrick" <[log in to unmask]>
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Phil,

We use the same geometry for inductors, C's and R's. These 0402's are so
tiny, the height difference is so small. Although the inductors are a bit
longer, but still have no problem at all. The geometry we use is this:

Land size: 0.6mm x0.675mm
Space between pad: 0.3mm

          0.675      0.3      0.675
        ____________       ____________
       |            |      |           |
       |            |      |           |0.6
       |            |      |           |
       |            |      |           |

We do use different geometry's for larger ones though.

Hope this help.

Patrick Lam


-----Original Message-----
From: Phil Bavaro [mailto:[log in to unmask]]
Sent: Wednesday, October 11, 2000 8:36 AM
To: [log in to unmask]
Subject: [TN] 0402 Inductor Pad Geometry


I have noticed that some 0402 inductors have different pad geometry
requirements from the geometries recommended for 0402 capacitors and
resistors.

It seems that due to the critical nature of  RF circuitry, a larger gap
between pads is recommended, making the total pad area smaller than the C
's and R's.

This was brought to my attention by one of our RF electrical designers who
kept having problems with his board until we changed the pads to what was
being recommended by the manufacturer of the part.

What is your approach to this problem?

Do you set up unique pad geometries for each 0402 component or do you
generalize that all 0402 packages only get one geometry?

We have approximately 56 parts which fit into this category which I am
looking for support from the group as to whether or not we go back and fix
all of these.

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