When working with a PCB design or editing software, you may notice that both the LQFP and TQFP have the same footprint. This means that they both have the same size. After all, they are both quad-flat packages. However, the TQFP has shorter leads than the LQFP. Why? TQFP vs. LQFP – How are they different, and are these the only differences? The following guide hopes to answer these questions. Thus, allowing you to identify which IC package you should use in your next PCB project.
What is a TQFP?
TQFP housing electronic components
The TQFP(thin quad flat pack ) is a low-profile version of the regular quad flat package. Regular QFPs may display up to 4.0 mm of thickness. Inversely, TQFP packages can have a maximum thickness of 1.4 mm. TQFPs lend themselves well when trying to reduce the overall thickness of your PCB so you can make it more portable.
What is an LQFP?
Simple LQFP IC
As its name implies, the LQFP (low-profile quad flat ) is a low-profile quad version of the regular quad flat package. Both it and the TQFP are surface-mounted packages. However, one of the key differences is that the LQFP has gull-wing leads that extend from each of its four sides. Nevertheless, they both have a maximum thickness of 1.4 mm.
TQFP vs. LQFP: The Differences
A stack of two IC packages
This section will explore the specifications of each and identify a few more differences.
TQFP Specifications
- Lead Count Range: 32 to 176
- Body Size Range: 5 mm x 5 mm to 20 mm x 20 mm
- Maximum Package Height: 1.4 mm
- Lead Frame Types: Copper Lead Frames
- Available Lead Pitches: 0.4 mm, 0.5 mm, 0.65 mm, 0.8 mm, 1.0 mm
TQFP Applications
Blue Transparent Image of TQFP
TQFP vs LQFP: Conclusion
Both packages are similar in that manufacturers use them in cost-conscious applications. LQFP can have higher lead counts, and its leads are longer. This makes it easier to mount than TQFP. Nevertheless, we can use both packages in similar applications as they are both low-profile packages. TQFPs are more available in smaller packages, while LQFPs are easier to attach to your PCB.
Additionally, you can purchase them in different die types. In most cases, they share the same moisture level (JEDEC Level 3). Ultimately, the distinctions between these two packages are so subtle that it barely makes a difference which one you choose.