Quad Flat Pack
A square, surface mount chip package that has leads on all four sides and comes in several varieties. PQFP (Plastic QFP) may refer to all of the following QFP types. All quad flatpacks use gull-wing leads, except for the CQFP, which stick straight out.

Plastic
MQFP   Metric QFP (most popular)
FQFP   Fine pitch QFP
BQFP   Bumpered QFP
LQFP   Low-profile QFP
TQFP   Thin-profile QFP
SQFP   Shrink QFP (same as MQFP)
Ceramic
CQFP   Ceramic QFP

How to identify computer chips or integrated circuits on circuit boards
This page lists some patterns and techniques for deciphering the part numbers.

Guide to integrated circuit chip packages
This page contains all computer chip or integrated circuit packages.

Jedec
JEDEC is the leading developer of standards for the solid-state industry. All JEDEC standards are available online, at no charge.

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