What's the difference between a process engineer and an equipment engineer?

In one sentence: the process engineer (PE) owns whether what a tool makes is right; the equipment engineer (EE) owns whether the tool itself runs. Same tool, two views: one watches the wafers, the other watches the machine. They talk to each other every day, because when a tool has a problem, their work gets tangled together.

What does a process engineer look after?

• Recipes: a recipe is the setting a tool runs: gases, pressure, power, seconds. The process engineer decides which one to use and what to change.
• Measurements and control charts: after each lot, thickness and line width are measured and plotted on control charts. A drift should be caught early.
• Lot decisions: when results are out of spec, should the lot be put on hold, reworked or released? They make the call.
• Improvement: experiments to make the same step more stable, with fewer defects.

What does an equipment engineer look after?

• Maintenance: parts wear and chambers get dirty, so tools get scheduled PM: open up, clean, replace parts, put back together.
• Alarms: when a tool's light turns red and an alarm pops up, they find which part or which signal is at fault.
• Repairs: when a tool is down, they bring it back up. If spares run short they find a way, and for big problems they work with the tool vendor's engineers.
• Less downtime: availability is one of the numbers an equipment engineer cares about most, and the tool's sensor data (FDC) is something they check every day.

A tool stops at night. Who does what?

Say an etch tool stops in the middle of the night with wafers still inside:

1. The technician on shift checks the tool first and calls the engineer on duty.
2. The equipment engineer checks the hardware: which part or signal failed, and whether it can be brought back.
3. The process engineer checks the wafers: how far the stuck ones got, whether they can be saved (finishing the step that was cut short, for example, or scrapping them), and whether the lots waiting behind should go to another tool.
4. After the repair, the equipment engineer does the tool handback, the process engineer runs the qual run on monitor wafers, and only when the results are in spec does the tool get its release back to production.

That last step matters: fixed hardware does not guarantee the same output. So repairing and verifying go to two people, and each signs for their own part.

When do you call the PE, and when the EE?

Situation	Call first
Red light, alarm, tool down	EE for the hardware; PE for the lots inside and behind
Measurement out of spec, control chart drifting	PE
PM schedule, part life, spares	EE
Changing a recipe, running an experiment	PE
Can the tool run product after PM?	Both: the EE fixes, the PE runs the qual

What do they study, and who suits which job?

University guides to semiconductor careers say process engineers often come from chemical engineering, materials or chemistry, and equipment engineers often from mechanical or electrical engineering; in practice both sides have people from many science and engineering fields. The bigger difference is the kind of problem you enjoy. If you like finding causes in data and tuning conditions, that leans toward process. If you like taking things apart and understanding how a machine works, that leans toward equipment. Both jobs can involve shifts or on-call duty, because a fab never stops.

In fab24hr

fab24hr has both process and equipment roles, and the production fab and the R&D line each split them into seven areas: litho, etch, thin film, CMP, furnace, implant and wet clean. As a process engineer, you decide at night what happens to the wafers stuck in a tool. As an equipment engineer, you judge from the technician's photos what broke, fix it, and hand the tool to Process for the qual run. The tools, lot numbers and people in the game are fictional; how the two jobs split the work comes from public, general sources, and the real split differs between companies. The letters PE have another meaning too: read Is a PE a process engineer or a product engineer?.