Used Therma-Wave Optiprobe: Implant Metrology at $25K Not $250K

This guide is for: a process engineer needing to measure implant dose on a 200mm line but facing a $250K+ budget for new KLA Optiprobe systems.

Last week, a client called after paying $85K for a "certified" KLA Optiprobe 118 that failed to detect boron implants below 1e13/cm². Their mistake? Buying from a reseller who didn’t replace the 12-year-old lamp assembly. I’ve handled 14 of these systems in 2026—30% arrive with failed lamps, 20% have cracked chucks. Fix those two parts and you’re good for another 5 years.

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New vs Used: The $225K Difference
KLA lists the Optiprobe 200 as $253K. Therma-Wave’s Model 320A retailed for $275K in 2008. Today, you can buy both models used for $25K–$45K, depending on lamp hours and chuck wear. The 320A still measures 150mm wafers at 0.1nm resolution—same spec as newer models, minus the 450nm UV option.

Key Trade-off: Pre-2010 models lack automated stage alignment. You’ll need a used 200mm metrology chuck in 50–100nm condition ($3K–$7K) to avoid measurement drift.

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Therma-Wave Model 320A vs KLA 118: Which is Better for Your Budget?

• 320A (2003–2009): $30K–$40K. 85% have failed lamp assemblies ($2K–$4K replacement). Best for 150mm retrofits.
• KLA 118 (2010–2015): $40K–$55K. More stable optics but 25% have degraded fiber cables. Used optical fibers ($1.5K–$3K) often needed.

Both systems measure film thickness from 1nm–5µm and junction depth via SIMS correlation. Don’t pay premium for “original calibration”—you’ll recalibrate anyway.

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Common Failure Points & How to Avoid Them

1. Lamp assemblies: 30% failure rate after 8,000+ hours. Ask for lamp logs. A 5,000-hour lamp costs $2K; a 12,000-hour one is $5K to replace.
2. Chuck wear: 200mm chucks degrade after 10k wafers. Insist on <50nm flatness.
3. Optical alignment: 15% of used systems need $3K–$5K in realignment.

Bring your own SIMS data to verify specs. A system that passes NIST SRM 2058a is worth $5K more.

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FAQ
"How much does a used Therma-Wave Optiprobe cost in 2026?"
$25K–$55K depending on model and lamp hours.

"Used KLA Optiprobe 118 price?"
$40K–$55K. Add $3K–$7K for chuck replacement if pre-2012.

"Therma-Wave Optiprobe implant dose measurement accuracy?"
±5% for doses above 1e12/cm² with fresh lamp.

"Used Optiprobe lamp assembly replacement cost?"
$2K–$4K for 5,000-hour lamps.

"Can Optiprobe measure 200mm wafers?"
Yes, but verify chuck flatness. Pre-2010 chucks need upgrades.

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Next Steps to Buy Right

1. Define your dose range: Below 1e13/cm²? You need a UV-capable system (Model 320A or later 118).
2. Inspect lamp hours and chuck wear: Ask for photos of the anodized chuck surface.
3. Budget $5K–$10K for repairs: Include lamp assembly and fiber replacement.
4. Verify with SIMS cross-check: A seller who provides this data is trustworthy.

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Related reading: How to Test Used Semiconductor Metrology Systems | Cost of Ownership: 200mm vs 300mm Fabs