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TQFP vs LQFP: What is the Difference Between Packages

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

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 

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 

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

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. Nevertheless, please get in touch with us if you have any PCB fabrication inquiries and want to learn more about these topics. 

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Hommer Zhao
Hi, I am Hommer, the founder of WellPCB. So far, we have more than 4,000 customers worldwide. If you have any questions, you can feel free to contact me. I really appreciate any help you can provide.

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