Screaming Circuits: And The Race Goes On


And The Race Goes On

AUP package The race for the smallest part is still going strong. That and the fact that basic logic gates are still with us is affirmed quite well with a new set of chips from NXP. The 74AUP2G00 is a dual two-input NAND gate in a no lead XSON8 package at just 1 mm x 1.35 mm. That's not the scary part. The scary part is the lead pads under the part are 0.15 mm wide and just 0.35 mm pitch center to center. That's 5.9 mils and 13.8 mils respectively. The gap between the pads is 0.2 mm (7.8 mils).

To put that in a little bit of perspective, an 0201 passive component is 24 mils x 12 mils. An 01005 is 16 mils x 8 mils.

Above right is a land pattern for the part with an 0201 bypass cap next to it. The trace going from the pin to ground (Pin 4) is an 8 mil trace. The trace going to VCC (pin 8) is six mils. The via is a pretty standard 24 mil via. As you can see, an eight mil trace and space isn't going to do for a board with this size of part on it. Six mil is really even a bit too big.

Duane Benson
La de da de de, la de da de da

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