CLCC/CQFN: High-Reliability Ceramic Packages Driving High-End Electronics

CLCC ceramic package

Today, with 5G communication base station power amplifiers facing heat dissipation bottlenecks, new energy vehicle electric drive control units needing to operate stably in high-temperature environments (up to 150℃ or higher), and satellite payload electronic equipment having to endure extreme temperature cycles, traditional plastic packaging technology is encountering unprecedented performance challenges. It is precisely against this backdrop that CLCC (Ceramic Leadless Chip Carrier) / CQFN (Ceramic Quad Flat No-leads) Ceramic Quad No-Lead Packages, with their outstanding heat dissipation capabilities, excellent high-frequency characteristics are becoming the preferred solution for high-end electronic system design.

Technical Definitions and Core Characteristics

CLCC and CQFN both belong to the four-sided leadless surface mount packaging manufactured on a high thermal conductivity ceramic substrate. Both are assembled using metallized solder terminals arranged on all four sides. However, their structural designs have different focuses, tailored to suit different application scenarios.

CLCC is a standardized ceramic chip carrier with a cavity. Its structure is primarily designed to provide a reliable and sealed protective environment for the internal chips, suitable for IC packaging with extremely high requirements for long-term stability. The chips can be interconnected through upward gold wire bonding in the cavity or through flip-chip bonding in the cavity.

The CQFN is a type of package that, without using lead wires, integrates a key feature: a large-area bare heat dissipation pad at the bottom. This design is aimed at establishing an efficient heat path for chips (especially power devices), enabling them to maintain the advantages of four-sided mounting while significantly outperforming the standard CLCC in terms of heat dissipation performance.

Compared with traditional plastic packaging, this type of packaging has the following characteristics:

●High-reliability ceramic material: Using aluminium oxide (Al2O3) or aluminium nitride (AlN), they are resistant to high temperatures, corrosion and aging, and remain stable in extreme environments for a long time.

●Four-sided leadless design: The pads are distributed on the bottom or around, supporting SMT (Surface Mount Technology), high-density PCB layout, and occupying a small space.

●Excellent electrical performance and heat dissipation: Ceramic materials are naturally insulating and have high thermal conductivity, which effectively dissipates heat and ensures the stable operation of high-frequency and high-power devices.

●Precision fabrication process: Powder forming, precise sintering, surface metallization, uniform size, flat pads, suitable for high-precision surface mount and welding.

●High dependability: The metallized solder joints are closely bonded to the ceramic substrate, and can operate stably for a long time in high-temperature, high-humidity and vibration environments.

●Various lead structures: Support dual-side and quad-side packaging.

●Multiple lead pitch options: Available in 2.7 mm, 1.00 mm, and 0.50 mm, meeting diverse design requirements.