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A leadless chip carrier (LCC or LLCC) is an integrated circuit package that has no pins/leads for contact. This surface-mount device makes use of metal pads at the outer edges to establish connection with the circuit board. Leadless chip carriers are popular, as they are light in weight, adaptable to a wide range of applications and are considered ideal for surface-mount applications.
A leadless chip carrier is usually square or rectangular in shape. Unlike other integrated circuit packaging, leadless chip carriers do not establish connection to devices by means of pins, but by means studs or metal pads provided around the periphery of the package. Due to reduction in weight, area and volume, leadless chip carriers are more durable and could withstand more vibration and shock compared to dual-in-line packages.
One of the salient features of a leadless chip carrier is its easy and convenient direct insertion to its socket mounted on the circuit board. It can also easily mount directly on the board. It is a low-cost solution for surface mounting, as it is lightweight and has no metallic external legs or leads. Unlike dual-inline packages, no holes are required for leadless chip carriers.
There are a few drawbacks associated with leadless chip carriers. The system is not considered homogeneous when leadless chip carriers are mounted to printed circuit boards. Failures of these systems have been common after limited stressing or thermal expansion. Most of these issues can be resolved by selecting the proper printed circuit board material.