Definition
Final test measures packaged-device performance and functionality; burn-in applies controlled stress to screen susceptible units; system-level test exercises the device in a representative operating environment.
Process position
Inputs
- Assembled package
- Test program and limits
- Socket, load board, and handler
- Thermal and stress profile
Outputs
- Pass/fail and performance bins
- Screening and traceability record
- Shipment disposition and yield feedback
How it works
- 01Inspect and establish continuity
- 02Run functional and structural patterns
- 03Measure parametric and performance limits
- 04Test across required temperature
- 05Apply burn-in where justified
- 06Run system-level scenarios where required
- 07Bin and release
Process control profile
Materials, equipment, defects, and metrology
These records connect a physical input and tool module to its failure mechanism, detection method, and release decision. They complement the broader inventories in the control surface.
Material focus
Socket, contactor, load board, thermal interface, test program, and limits
Connect the packaged device to controlled electrical, thermal, and system-level stimuli.
Control: Control contact wear, board integrity, calibration, program revision, guardbands, thermal contact, and traceability.
Failure link: Interface or programme drift creates false rejects, escapes, damage, or bin shifts.
Equipment module
ATE, handler, thermal system, burn-in oven/board, and system-level rack
Exercises packaged devices across electrical, temperature, stress, and representative workload conditions.
Control variables: Coverage, timing, voltage/current accuracy, temperature, contact, stress duration, parallelism, and retest.
Integration risk: Content should be allocated across stages according to observability, risk, test time, and device value.
Defect mechanism
Test escape, false reject, contact failure, or inadequate stress screen
Coverage gap, limits, thermal mismatch, interface wear, programme error, or unrepresentative stress misclassifies units.
Detection: Correlation lots, diagnostics, bin analysis, burn-in monitoring, and field-return correlation.
Downstream effect: Ships latent failures, wastes good product, or masks a process excursion.
Metrology gate
Package and system-level electrical test
Measures specified function, performance, parametrics, and stability under controlled conditions.
Release decision: Assigns shipment bins and triggers failure analysis or containment when signatures move.
Limitation: Passing production test is evidence against defined faults, not proof of unlimited lifetime or all use conditions.
Test content changes across the lifecycle
Wafer test, final test, burn-in, and system-level test observe different failure modes under different interfaces and conditions. Repeating a pattern at two stages can still be useful when packaging or temperature changes the observable behavior.
Screening is an economic allocation problem
More coverage, temperature points, and stress can reduce escape risk but add equipment time and may consume device life. Test flows allocate content to the stage where it produces the strongest risk reduction per unit of cost and time.
Sources
Citations support the tagged claims above. Access dates record when Maha Strategies last checked the public source.
- [1]Technical Briefing: Semiconductor Test · Advantest · 2024 · accessed 2026-08-13
- [2]Test Services · ASE · accessed 2026-08-13
- [3]IC Semiconductor Test Services · Amkor Technology · accessed 2026-08-13
Public capability landscape
Supplier profiles
Named companies are research leads based on public evidence. Inclusion does not establish customer qualification, process-of-record status, available capacity, or supplier ranking.
Semiconductor automatic test equipment
Advantest
Supplies semiconductor test systems and interfaces used at wafer sort, final test, and other screening stages.
Evidence profile →
Outsourced semiconductor assembly and test
ASE Technology
Provides semiconductor assembly, packaging, wafer probe, final test, and related engineering services.
Evidence profile →
Outsourced semiconductor assembly and test
Amkor Technology
Provides package design, wafer preparation, die attach, wire bond, flip chip, stacked-die assembly, and semiconductor test services.
Evidence profile →