Power Semiconductor Chip Metallic Layer Leadframe Integration
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Solution Overview
Problem
Current methods for manufacturing power semiconductor devices face challenges in efficiently integrating power semiconductor chips with leadframes and metallic layers, particularly in achieving reliable electrical connections and heat dissipation while maintaining structural integrity and scalability.
Innovation Solution
The integration of power semiconductor chips with leadframes and metallic layers involves a process where the chips are mounted on carriers with electrodes, and metallic layers or clips are applied to facilitate electrical connections and heat dissipation, using techniques such as diffusion soldering, wire bonding, and encapsulation with mold materials to create a robust and scalable device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power semiconductor chips are integrated with leadframes using conventional methods, then electrical connections are established, but manufacturing efficiency and scalability are limited
Solution Approach 1:
The patent combines the chip mounting, metallic layer application, and electrical connection processes into an integrated manufacturing flow. The leadframe serves as both the mechanical carrier and electrical interconnect, merging structural and electrical functions into a single component that simplifies the overall device assembly and enhances manufacturing scalability.
Solution Approach 2:
The leadframe is designed to perform multiple functions simultaneously: mechanical support for the chip, electrical interconnection between chip and external terminals, and heat dissipation pathway. This multi-functionality reduces the number of separate components needed and simplifies the manufacturing process while improving productivity.
2Reliability
If metallic layers are applied to power semiconductor chips, then electrical connections are improved, but manufacturing process complexity increases
Solution Approach 1:
The metallic layers are pre-applied to the leadframe in specific patterns before chip mounting. This preliminary preparation ensures that when the chip is attached, electrical connections are immediately established through the pre-positioned metallic traces and contact pads, improving connection reliability while streamlining the overall manufacturing process.
Solution Approach 2:
The metallic layers on the leadframe act as intermediary conductive paths between the chip electrodes and the external terminals. These metallic traces provide reliable electrical connection while the leadframe structure itself serves as the mechanical and electrical interface, reducing the need for additional connection components and simplifying manufacturing.
3Temperature
If conventional chip mounting methods are used, then chip integration is achieved, but heat dissipation efficiency is insufficient
Solution Approach 1:
The leadframe is designed to simultaneously provide mechanical support, electrical connection, and thermal management functions. The metallic construction of the leadframe creates efficient thermal pathways from the chip mounting area to the external terminals and heat sinks, improving heat dissipation without adding separate thermal management components that would complicate manufacturing.
Solution Approach 2:
The leadframe structure itself serves as the heat dissipation mechanism through its inherent high thermal conductivity metallic construction. The same component that provides mechanical and electrical functions also handles thermal management, eliminating the need for additional dedicated heat dissipation components and maintaining manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables reliable electrical connections, effective heat dissipation, and scalable manufacturing of power semiconductor devices, enhancing their performance and reliability in high-voltage and high-frequency applications.
Implementation Method 1
A metallic layer 16 is placed over the power semiconductor chip 10 such that a first surface 17 of the metallic layer 16 faces a second surface 14 of the power semiconductor chip 10. The second surface 18 of the metallic layer 16 and a surface 24 of the lead 21 lie within a common mounting plane 27.
Implementation Method 2
metallic layers or clips are applied to facilitate electrical connections and heat dissipation
Data Source
AI summary
A device including a power semiconductor chip. One embodiment provides a power semiconductor chip having a first electrode on a first surface and a second and a third electrode on a second surface opposite to the first surface. A leadframe includes a carrier and a first lead, the power semiconductor chip placed over the carrier with the first surface of the power semiconductor chip facing the carrier. A metallic layer includes a first surface and a second surface opposite to the first surface. The metallic layer is placed over the second surface of the power semiconductor chip with the first surface of the metallic layer facing the power semiconductor chip. The second surface of the metallic layer and a surface of the first lead lie within a common mounting plane.