Low-Yield / Scrap Dies & Wafers

100mm–300mm Wafer Sizes

50–90% Savings vs Prime Grade

Wafer · Die · Fragment Form Factors

Spot & Contract Availability

Overview

Not every wafer in your fab needs to be prime grade. Equipment qualification, process development, training, and mechanical testing consume wafers that never become sellable product — and using prime-grade wafers for these applications represents unnecessary cost. GINECHIP bridges the gap between the surplus wafer market and fabs that need cost-effective, fit-for-purpose substrates for non-revenue-generating activities.

We source low-yield wafers, scrap/reject wafers, engineering-grade substrates, and surplus lots from semiconductor manufacturers worldwide. These wafers may have parametric or visual defects that make them unsuitable for device production, but they are perfectly adequate — and often ideal — for process development, tool qualification, training, thermal uniformity monitoring, and equipment maintenance. Cost savings of 50–90% versus prime-grade material are typical, translating to hundreds of thousands of dollars annually for a mid-volume fab.

Non-Prime Wafer Grade Classification

Low-Yield (Near-Prime)

Wafers that were processed through a standard fabrication flow but exhibit yield below the customer's acceptance threshold — typically due to edge die loss, parametric corner outliers, or particle-limited yield. These wafers may have 40–80% functional die and are close to prime in physical characteristics.

Near-prime film stacks and surface quality
May have partial die functionality
Ideal for equipment requalification and process monitoring
Often available with parametric test data

Scrap / Reject

Fully non-functional wafers rejected at electrical test, visual inspection, or process control. May have gross patterning defects, metal shorts/opens, contamination, or other yield-killing defects. Suitable for mechanical testing, thermal profiling, and destructive analysis.

Zero or near-zero functional die
Significantly lower cost than low-yield
Good for mechanical handling and cassette fill
May include patterned, blanket, or partial-process wafers

Engineering / Surplus Lots

Excess inventory from engineering builds, qualification lots, or over-ordered production material. These wafers may be prime quality but are surplus to the original owner's requirements. A cost-effective source of near-prime material for process development.

Often prime or near-prime physical quality
May be blank or with partial processing
Irregular lot sizes — what's available is available
Blanket purchase arrangements for recurring supply

Die & Fragment Lots

Singulated die, partial wafers, wafer fragments, and mixed lots for specialized applications: failure analysis training, SEM sample preparation, packaging tool setup, and academic research. Available as sawn die on tape/frame, in waffle packs, or loose.

Any die size, any technology node
Known-good die (KGD) and known-bad die (KBD)
Partial wafers and wafer fragments for SEM/FIB
Minimum quantities as low as single die or wafer fragment

Technical Specifications

Parameter	Available Range / Values
Wafer Grade	Low-yield (sub-prime), Scrap/Reject (parametric or visual fail), Engineering-grade, Equipment-grade (dummy/mechanical)
Diameter	100mm (4″), 150mm (6″), 200mm (8″), 300mm (12″) — all standard sizes
Type / Dopant	P-type (Boron), N-type (Phosphorus, Arsenic), various resistivities — subject to available surplus inventory
Yield Description	Any yield level — from near-prime with minor edge exclusion to fully non-functional scrap
Die State	Wafer form (undiced), Singulated die (sawn on tape/frame or loose), Partial wafer / fragments
Defect Types	Particle contamination, Lithography misalignment, Etch defects, Metal shorts/opens, Parametric outliers, Edge chips, Visual cosmetic rejects
Quantity	Individual wafers, Box lots (25 wafers), Cassette lots, Partial lots, Mixed-lot surplus
Packaging	Standard wafer cassette/shipper, Vacuum-sealed (moisture-sensitive), Gel-Pak or waffle pack (singulated die)
Documentation	Lot traveler (if available), Parametric test summary (if available), Defect map (if available), Certificate of Conformance
Availability	Spot surplus — subject to inventory; blanket purchase agreements welcome; notification service for matching material

Use Cases: Where Non-Prime Wafers Deliver Value

Equipment & Process

Tool Qualification — Run qualification wafers through new, relocated, or post-maintenance equipment to verify performance before committing prime material
Process Development — Develop and optimize new process recipes on low-cost wafers before transferring to production
Thermal Uniformity Monitoring — Furnace and RTP temperature profiling using non-prime monitor wafers
Particle Monitoring — Daily particle count verification on cost-effective test wafers

Training & Analysis

Operator Training — Train new fab operators on real wafers without risking production material
Cassette & Carrier Fill — Fill empty slots in wafer cassettes and FOUPs for thermal and flow uniformity
Failure Analysis Practice — FA lab training samples for deprocessing, cross-sectioning, and SEM imaging practice
Academic Research — University cleanroom research projects — heavily discounted or donated material

Procurement Models

Spot Purchase

Buy what's available now from our current surplus inventory. Ideal for immediate needs — equipment requalification, unexpected process development, or one-time training events. Quick turnaround; material ships within 48 hours of PO.

Standing Order

Establish a monthly or quarterly standing order for a consistent supply of non-prime wafers matching your diameter, type, and grade preferences. We proactively source material on your behalf and hold inventory against your forecast.

Surplus Disposition

Have surplus, scrap, or engineering wafers you need to disposition? We buy non-prime wafer inventory from fabs and IDMs worldwide. Turn idle material into revenue. Contact us for a valuation of your surplus wafer inventory.

Applications

Equipment Installation & Qualification — Qualify new tools and requalify after maintenance using cost-effective non-prime wafers instead of production material

Process Recipe Development — Develop and optimize etch, deposition, CMP, and lithography recipes on low-yield wafers before production ramp

Fab Training Programs — Real-wafer training for new equipment operators, process engineers, and maintenance technicians

Thermal & Flow Uniformity — Fill empty cassette/FOUP slots for uniform thermal mass and gas flow in furnaces and process chambers

Failure Analysis Lab — Practice samples for deprocessing, delayering, cross-sectioning, FIB, and SEM/EDX analysis training

University & R&D — Low-cost wafers for academic cleanroom research, student projects, and proof-of-concept demonstrations

Quality & Certification

All non-prime wafer shipments are visually inspected for gross damage, packaged in standard wafer cassettes or shipping boxes appropriate to the material condition, and shipped with available documentation (lot traveler, parametric summary, defect map). While non-prime material is not guaranteed for device production, we work transparently with customers to match material to application requirements. ISO 9001:2015 certified quality management for all procurement, inspection, and logistics operations.

Need Cost-Effective Wafers for Your Fab?

Tell us your wafer diameter, type preference, quantity, and intended application — our surplus team will identify matching material and provide a quotation, often at 50–90% below prime-grade pricing.

Request a Quote Contact Engineers

ISO 9001:2015 50–90% Savings Global Sourcing Surplus Buyback