February 11, 2026 | Author: Chi-Tang Cheng

Customer Profile: Chang Chun Arizona Plant

Chang Chun Arizona LLC (CCAZ), a U.S. subsidiary of Chang Chun Group, is the group’s electronic-grade chemical manufacturing site in Casa Grande, Arizona. Founded in 1949, Chang Chun Group has annual revenue of about USD 8 billion and is Taiwan’s largest supplier of wet chemicals and litho-chemicals for the semiconductor industry.

Built with a USD 300 million investment, the Arizona plant primarily produces the high-purity electronic-grade chemicals indispensable to semiconductor processes, including electronic-grade hydrogen peroxide, tetramethylammonium hydroxide (TMAH) developer, electronic-grade solutions, and plating solutions. The plant is a core member of TSMC’s localized supply chain for its Phoenix wafer fab, providing critical raw-material support for U.S. semiconductor manufacturing.

Project Background: Quality Control Needs of the New U.S. Plant

Before deploying the MiDFUN SPC system, the Chang Chun Arizona plant faced the following quality management pain points:

Cross-Border Management and Standard Synchronization

As an overseas expansion project of Chang Chun Group, ensuring that the U.S. plant’s quality control logic stayed in sync with Taiwan headquarters while also complying with local U.S. operating practices and regulations was a major challenge in the early plant-building phase.

Lagging Early Warning Mechanism

Traditional management models were largely “after-the-fact review.” By the time a nonconforming product was discovered, large amounts of waste had often already been produced, lacking the trend-analysis capability for “up-front prevention.” For electronic-grade chemicals, a single batch of nonconforming product can directly affect the wafer yield of downstream semiconductor customers.

Customer Audit Pressure

Semiconductor customers have extremely high data integrity requirements for their suppliers and need to review process capability Cpk reports and anomaly handling tracking records at any time. Manual compilation struggles to meet the requirements for timeliness and accuracy.

Deployment Approach: Rapidly Replicating Taiwan’s Experience at the U.S. Plant

This project deployed the MiDFUN SPC statistical process control system. The MiDFUN SPC system is not merely a tool for plotting control charts, but an integrated management platform combining data acquisition, inspection data process control, anomaly alerting, and quality analytics. To meet the needs of the Chang Chun Arizona plant, the MiDFUN SPC system achieved a digital transformation of quality management in the following ways:

Direct Transfer of Taiwan Experience

Building on the MiDFUN SPC system rollout experience at Chang Chun Group’s Taiwan plant, the successful case was transferred directly to the U.S. plant for rollout. This cross-border experience transfer model not only saved system rollout time but also avoided the issues the Taiwan plant had encountered during its own deployment, substantially reducing the deployment risk for the overseas plant.

Real-Time Data Alerts

The MiDFUN SPC system has built-in anomaly detection rules such as the Western Electric Rules. Once data triggers an abnormal trend — for example, consecutive rising points or deviation from the center line — the system immediately sends an email notification to the engineer. The engineer can enter the cause and handling of the anomaly into the system, after which Pareto chart analysis can be used to analyze anomaly causes and pinpoint the most frequent sources of problems.

Intuitive Presentation of Process Capability

The MiDFUN SPC system turns complex statistical data such as Cpk (process capability index), Ca (accuracy), and Cp (precision) into intuitive visual displays through a search interface. Managers can see the operating status of each production line at a glance and can quickly produce the required reports during customer audits.

Bilingual Chinese-English Interface

The MiDFUN SPC system offers a Chinese-English interface toggle, making it convenient for experts at Taiwan headquarters to provide remote guidance while also allowing local U.S. staff to operate smoothly in English. This multilingual design is especially critical for deploying a quality management system when a Taiwanese company sets up a plant overseas.

Deployment Scope and Results

Conclusion

By deploying the MiDFUN SPC system, the Chang Chun Arizona plant successfully advanced its quality management from “manual” toward “digital and intelligent.” The model of building on the Taiwan plant’s rollout experience and rapidly replicating it at the U.S. plant proves the portability and practicality of the MiDFUN SPC system in a cross-border environment. This not only meets the semiconductor industry’s stringent quality requirements for suppliers, but also lays a solid quality-data foundation for Chang Chun Group’s positioning in the global semiconductor supply chain.