Semiconductor Exposed Pad Grounding Verification
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Solution Overview
Problem
Existing semiconductor packages face issues with ensuring firm bonding between the exposed pad and the ground surface of a circuit board, leading to potential operational failures due to insufficient grounding.
Innovation Solution
A semiconductor device is designed with a test pad and resistor part on the chip, connected to the exposed pad, allowing for electrical connection verification between the exposed pad and the ground surface without additional pins, using a pull-up resistor to differentiate between normal and fail modes based on connection status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exposed pad is not firmly bonded to the ground surface, then the device structure remains simple, but grounding reliability deteriorates leading to operational failures
Solution Approach 1:
The patent implements a test pad and resistor part on the semiconductor chip that enable pre-bonding electrical connection verification between the exposed pad and ground surface. This preliminary detection capability allows grounding issues to be identified before the device is fully assembled and deployed, thereby improving grounding reliability without requiring complex additional bonding structures.
Solution Approach 2:
The patent introduces a test pad and resistor part as intermediary elements that facilitate the detection of electrical connection status between the exposed pad and ground surface. These intermediary components enable indirect verification of bonding quality through electrical measurements, resolving the contradiction by providing a simple yet effective means to assess grounding reliability.
2Difficulty of detecting and measuring
If additional pins are added for connection verification, then detection capability improves, but device complexity increases
Solution Approach 1:
The patent utilizes existing chip structures (test pad and resistor part) to serve multiple functions: normal device operation and electrical connection verification. By making the existing components multi-functional, the patent enables connection detection without adding dedicated verification pins, thus improving detection capability while maintaining device simplicity.
Solution Approach 2:
The semiconductor chip performs self-verification of its electrical connection status using its own internal structures (test pad and resistor part). This self-service capability eliminates the need for external verification pins or additional testing equipment, allowing the device to autonomously detect bonding issues while keeping the overall device complexity low.
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
Enables detection of contact defects between the ground surface and the exposed pad, ensuring stable electrical connectivity and normal operation of the semiconductor device.
Implementation Method 1
The semiconductor device may include a resistor part disposed in the semiconductor chip, and electrically connected to the test pad. The resistor part may be a pull-up resistor.
Implementation Method 2
The exposed pad and the ground portion of the circuit board may be bonded to each other using solder.
Data Source
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AI summary
A semiconductor device includes a circuit board including a ground portion, and a semiconductor package disposed on the circuit board. The semiconductor package includes an external connecting pad and an exposed pad. The exposed pad and the ground portion are electrically connected at a first surface of the exposed pad. A semiconductor chip is disposed on a second surface of the exposed pad and electrically connected to the external connecting pad. The first surface of the exposed pad is located external to the semiconductor package, and the second surface of the exposed pad is located within the semiconductor package. A test pad is disposed on the semiconductor chip and is electrically connected to the exposed pad.