Unlock instant, AI-driven research and patent intelligence for your innovation.

Electroplating method for lead frame

A lead frame and electroplating solution technology, which is applied in the field of electroplating of lead frames, can solve the problems of poor appearance characteristics of electroplating uniformity, low cost, and inability to meet the electroplating treatment of lead frames, etc., achieve small internal stress, improve service life, good binding effect

Inactive Publication Date: 2020-10-30
天水华洋电子科技股份有限公司
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing literature search, it is found that the Chinese Patent Publication No. CN106521583A, the patent application published on March 22, 2017, discloses a method for electroplating a lead frame. Four steps are used to realize the electroplating treatment of the lead frame. Although the dry film is used as the protective film, the cost is low, and it can only be applied to the electroplating treatment of a single area, but the uniformity of the electroplating and the appearance of the electroplating layer are poor, and it is impossible to Meet the electroplating treatment of multi-region lead frame

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electroplating method for lead frame
  • Electroplating method for lead frame
  • Electroplating method for lead frame

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A lead frame electroplating method includes the following steps:

[0022] 1) Silver electroplating layer: divide all unit windows of the lead frame set-up arranged in an array into 3 groups arranged in a staggered manner, and electroplating silver layers respectively; before electroplating of the first group of unit windows in the staggered arrangement, use the first 3 groups of unit windows are shielded; the staggered second group of unit windows are shielded by the first group of unit windows before electroplating; the staggered third group of unit windows are used before electroplating 2 groups of unit windows are shielded. The electroplated silver layer can produce an ultimate tensile strength of 700°C.

[0023] 2) Electroplating solution treatment: the anode and the substrate with via holes formed on the surface are immersed in the electroplating solution in the electroplating tank, the anode is arranged to be opposite to the surface of the substrate, and the insoluble...

Embodiment 2

[0026] A lead frame electroplating method includes the following steps:

[0027] 1) Silver electroplating layer: divide all unit windows of the lead frame set-up arranged in an array into 3 groups arranged in a staggered manner, and electroplating silver layers respectively; before electroplating of the first group of unit windows in the staggered arrangement, use the first 2 sets of unit windows are shielded; the staggered second set of unit windows are shielded by the third set of unit windows before electroplating; the staggered third set of unit windows are shielded before electroplating is performed 1 group of unit windows are shielded. The electroplated silver layer can produce an ultimate tensile strength of 720°C.

[0028] 2) Electroplating solution treatment: the anode and the substrate with via holes formed on the surface are immersed in the electroplating solution in the electroplating tank, the anode is arranged to be opposite to the surface of the substrate, and the i...

Embodiment 3

[0031] A lead frame electroplating method includes the following steps:

[0032] 1) Silver electroplating layer: divide all unit windows of the lead frame set-up arranged in an array into 3 groups arranged in a staggered manner, and electroplating silver layers respectively; before electroplating of the first group of unit windows in the staggered arrangement, use the first Three groups of unit windows are shielded; the staggered second group of unit windows are shielded by the third group of unit windows before electroplating; the staggered third group of unit windows are used before electroplating 2 groups of unit windows are shielded. The electroplated silver layer can produce an ultimate tensile strength of 750°C.

[0033] 2) Electroplating solution treatment: the anode and the substrate with via holes formed on the surface are immersed in the electroplating solution in the electroplating tank, the anode is arranged to be opposite to the surface of the substrate, and the insol...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an electroplating method for a lead frame, and belongs to the technical field of lead frame electroplating. The electroplating method for the lead frame is implemented mainly by the three steps of silver layer electroplating, electroplating solution treatment, and electroplating treatment. According to the method, an object to be electroplated is repeatedly electroplated with an insoluble anode, an independent electroforming material is adopted for treatment, multi-time multi-region electroplating treatment can be carried out, and the service life of the lead frame canbe significantly prolonged. When the lead frame is electroplated through the method, the flow rate of a solution is 6-9 m / sec, the ratio of the anode area to the cathode area is 6-8:1, and the electroplating velocity is 0.7-1.2 micrometers / sec, and the cathode efficiency is up to 95.7%-97.3%. According to the method, electroplating treatment is performed 1000-4000 times, the uniformity of electroplating and the appearance characteristics of an electroplated layer are good and obviously better than those of conventional electroplating treatment, and the effect is remarkable.

Description

Technical field [0001] The invention belongs to the technical field of lead frame electroplating, and specifically relates to a lead frame electroplating method. Background technique [0002] As the chip carrier of the integrated circuit, the lead frame is a key structural component that realizes the electrical connection between the internal circuit lead-out end of the chip and the outer lead by means of bonding material, and forms the key structure of the electrical circuit. Lead frames are required in most semiconductor integrated blocks, which are important basic materials in the electronic information industry. [0003] At present, the commonly used electroplating methods include full immersion plating, selective immersion plating, brush plating, partial plating, etc. Among them, full immersion plating is suitable for full plating of the entire lead frame, base plating and full plating of functional layers. A search of the existing literature found that the Chinese Patent Pub...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/00C25D3/12C25D3/38C25D3/46C25D5/02C25D5/12
CPCC25D3/12C25D3/38C25D3/46C25D5/022C25D5/12C25D7/00
Inventor 不公告发明人
Owner 天水华洋电子科技股份有限公司