Job Description

onsemi is currently seeking a hands-on Process Engineer. This person will utilize innovative concepts and best-known methods to improve and develop processes and products. The ideal candidate will also provide technical leadership, support, and training to internal and external customers.

Test Process Engineer – Job Description

The Test Process Engineer is responsible for developing, optimizing, and sustaining semiconductor test processes to ensure high yield, reliability, and cost-effective production. This role focuses on troubleshooting test-related issues, driving yield improvement, and ensuring robust test coverage across products.

Key Responsibilities

1. Test Process Development & Optimization

• Develop, qualify, and release test processes for new products (NPI to Production transition).
• Define test methodologies, limits, and guard bands based on characterization data.
• Optimize test programs to improve throughput, test time, and cost efficiency.

2. Yield Monitoring & Improvement

• Monitor daily test yield performance and identify yield loss drivers.
• Perform Pareto analysis on failures.
• Drive root cause analysis (RCA) and implement corrective/preventive actions (CAPA).
• Collaborate with cross-functional teams (Assembly, Design, Wafer Fab) to resolve systemic issues.

3. Defect Analysis & Troubleshooting

• Investigate abnormal test trends (e.g., IDSS shifts, leakage, parametric drift).
• Perform correlation studies between wafer sort, final test, and reliability data.
• Support failure analysis (FA) and validate containment actions.

4. Test Program & Equipment Support

• Support test program development and debug on ATE platforms (e.g., Advantest, Teradyne).
• Ensure proper handler/prober interface and test setup optimization.
• Work with equipment engineering to resolve tester hardware issues.

5. Process Control & SPC

• Implement and maintain SPC controls (UCL/LCL, Cpk, Ppk) for critical parameters.
• Track key metrics such as yield, test escapes, retest rate, and DPPM.
• Establish control plans and reaction plans for out-of-control conditions.

6. Continuous Improvement & Cost Reduction

• Drive test cost reduction initiatives (test time, multisite optimization, program efficiency).
• Improve productivity through automation and standardization.
• Lead yield step-up plans following excursions or recovery events.

7. Documentation & Reporting

• Prepare technical reports, yield summaries, and management updates.
• Document test procedures, specifications, and engineering change notices (ECNs).
• Ensure compliance with quality standards (ISO, customer requirements).

Key Performance Indicators (KPIs)

• Test yield vs target (%)
• Test time reduction (%)
• DPPM / test escape rate
• Retest rate / on-hold rate
• SPC stability (Cpk, UCL compliance)
• Cycle time impact (test-related)

Competencies:

• Self-motivated and independent
• Approachable & internal customer focus
• Integrity
• Action Oriented
• Strategic Agility & Planning
• Communication Skills (both written and presentation).
• Strong attention to detail
• Cross-functional
• Familiarity with health and safety requirements in an industrial environment

Requirements:

• Bachelor’s degree in engineering, with 1+ years of industrial/manufacturing experience, or advanced degree with relevant lab experience.
• Experience with JMP, Minitab, Tableau or similar software preferred.
• Excellent analytical, organizational, planning, and problem-solving/troubleshooting skills.
• Comfortable in a fast-paced engineering and manufacturing environment.
• Well-developed interpersonal and communication skills, and ability to manage conflict in a stressful environment.
• Understands and listens to team members and fosters a productive team environment.
• Handles multiple projects and priorities.
• Must be able to work independently with limited supervision.
• Proficient in advanced techniques with relevant software: MS Project, Excel, PowerPoint, Word, etc. in addition to experience working within shared work environments.
• Experience in Assembly & Test (back-end) environment preferred