External Manufacturing Staff Operation Engineer

onsemi is currently seeking an experienced Process Engineer to support and optimize wafer bumping & DPS manufacturing processes for high-volume semiconductor production. The successful candidate will be responsible for process development, process characterization, yield improvement, defect reduction, equipment qualification, and manufacturing support while ensuring compliance with quality and reliability requirements. Relevant bumping experience may include UBM, photolithography, plating, reflow, wafer thinning, WLCSP, Cu pillar, solder bump, micro-bump, or advanced packaging technologies.

· Own and maintain wafer bumping processes to achieve yield, quality, cycle time, and cost targets.

· Develop, optimize, and sustain bump & DPS related processes including:

UBM deposition

Photolithography

Electroplating

Reflow

Wet etch/strip

Wafer thinning and grinding

Wafer saw

Final wafer inspection

· Conduct DOE, process characterization, and robustness studies for new products, materials, equipment, and process changes.

· Perform root cause analysis and implement corrective/preventive actions for yield, reliability, and defectivity issues.

· Lead failure analysis activities related to bump defects such as:

Missing bump

Non-wettable bump

Bridging

Voids

Bump height variation

Oxidation

Delamination

Cracking

· Establish SPC monitoring and process control plans.

· Support qualification activities, customer requirements, and manufacturing change management.

· Collaborate with Quality, Reliability, Product Engineering, Equipment Engineering, Suppliers, and Customers on technical issues.

· Evaluate and qualify new materials, bump masks, tooling, and equipment.

· Drive continuous improvement projects to enhance yield, productivity, and cost efficiency.

· Provide technical training and guidance to process technicians and manufacturing personnel.

· Bachelor's Degree or higher in:

Electrical Engineering

Electronic Engineering

Materials Science

Chemical Engineering

Mechanical Engineering

Semiconductor Engineering

· Minimum 5 years of semiconductor manufacturing experience.

· Minimum 3 years of direct wafer bumping process experience.

· Strong knowledge of:

Solder bump technology

Cu pillar bumping

WLCSP

UBM process

Electroplating

Reflow process

· Experience in high-volume semiconductor manufacturing environment.

· Strong understanding of SPC, MSA, FMEA, Control Plan, 8D, and DOE methodologies.

· Hands-on experience in process troubleshooting and yield improvement.

· Proficient in statistical data analysis tools such as JMP, Minitab, or equivalent.

· Familiar with semiconductor quality standards and customer qualification requirements.