Semiconductor Device Exposed Drain Tab Thermal Management
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Solution Overview
Problem
Existing semiconductor devices face challenges in heat dissipation and board level reliability due to increasing demand for thinner electronic components and higher power output, which leads to overheating and reduced operational characteristics in power semiconductor devices.
Innovation Solution
A semiconductor device design featuring an exposed source pad on the bottom for direct soldering to a PCB, an exposed top drain pad for heat dissipation using a heatsink, and additional gull-wing leads for source and gate connections, along with a dual-gauge clip and copper slug for improved thermal performance and board level reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the semiconductor device uses conventional packaging with enclosed leads, then the device structure is compact and protected, but heat dissipation is insufficient and board level reliability is reduced
Solution Approach 1:
The patent extracts the drain connection and heat dissipation function from the enclosed package structure by providing an exposed drain tab that extends outward from the molded body. This allows direct thermal contact with heatsinks and improved heat dissipation while maintaining the protective enclosure for other components.
Solution Approach 2:
The patent transitions from a conventional planar lead arrangement to a three-dimensional structure with an exposed drain tab that extends vertically from the molded body. This dimensional change enables direct thermal pathways and improved board level reliability through additional solder joints without increasing the footprint area.
2Power
If the semiconductor device is designed for higher power output, then the power handling capability is improved, but heat generation increases causing overheating
Solution Approach 1:
The patent introduces an intermediary exposed drain tab structure that serves as a thermal mediator between the power semiconductor die and external heatsinks. This tab provides a direct thermal pathway that facilitates heat transfer from the high-power device without requiring the entire package to be thermally conductive.
3Reliability
If additional solder joints are provided for board level reliability, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The exposed drain tab serves multiple functions simultaneously: it provides electrical connection to the drain, acts as a thermal pathway for heat dissipation, and creates an additional solder joint for enhanced board level reliability. This multi-functionality achieves reliability improvement without proportionally increasing manufacturing complexity.
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
The design enhances thermal performance, allows higher power output, and increases device density on the PCB by providing dual cooling techniques and additional solder joints, while absorbing physical stresses for improved board level reliability.
Implementation Method 1
a die attached to the lead frame using a first solder
Implementation Method 2
a clip attached to the die using a second solder
Data Source
AI summary
A semiconductor device is provided that includes a lead frame, a die attached to the lead frame using a first solder, a clip attached to the die using a second solder, and a copper slug attached to the clip. First gull wing leads are attached to the leadframe for a drain connection of the semiconductor device. Second gull wing leads are attached to the clip for a gate connection and for a source connection of the semiconductor device.