A STOLL lead frame structure

By optimizing the pin structure of the STOLL leadframe to form electrical interconnections and independent functional units, and by setting stress relief holes and plating at key pins, the problem of parasitic capacitance between pins affecting signal transmission is solved, thereby improving electrical performance and structural strength.

CN224521651UActive Publication Date: 2026-07-17NINGBO GANGBO ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NINGBO GANGBO ELECTRONICS CO LTD
Filing Date
2025-06-23
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The existing STOLL lead frame structure layout is unreasonable, and the parasitic capacitance generated between the pins affects the signal transmission speed, and the electrical performance needs to be improved.

Method used

The pin structure is designed such that the first, second, third, and fourth pins on the left are electrically interconnected to form the first functional unit, and the fifth pin on the right is set independently. A semi-circular stress relief hole is opened on the fifth pin facing to the left. The height of the inner pin is higher than that of the outer pin, and the height of the outer pin is the same as that of the base island. A V-shaped groove and a trapezoidal groove are provided on the outer pin, and silver-plated and nickel-plated areas are provided on the inner pin.

Benefits of technology

It reduces parasitic capacitance between pins, improves signal transmission speed, enhances electrical performance, and avoids fatigue fracture caused by stress concentration on pins.

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Abstract

This utility model discloses a STOLL lead frame structure. The STOLL lead frame structure includes a base island and a pin structure. The pin structure includes a first pin, a second pin, a third pin, a fourth pin, and a fifth pin, all located on the same side of the base island and separately disposed from the base island. The electrical interconnection of the first pin, second pin, third pin, and fourth pin forms a first functional unit, and the fifth pin is independently disposed to form a second functional unit. A stress relief hole is provided on the inner pin of the fifth pin near the first functional unit. This invention solves the problems of unreasonable layout in existing STOLL lead frame structures, and the parasitic capacitance generated between pins affecting signal transmission speed and resulting in poor electrical performance.
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