Dynamic electrical and RDL-location correlation
Complete the thermal-cycle electrical timeline and net-to-layout mapping first.
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Compare each solution's purpose, inputs and limits.
For “Cracking and intermittent opens in fine-line RDL after thermal cycling”, check what each solution can answer before planning validation.
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BLNKK assessment notes
Update engineering conditions →Your next step
Compare purposes and limits now. Confirm key sample conditions before planning validation.
0 solutions selected0 of 3 relevant conditions confirmedNo solutions selected; these notes cover the current engineering problem.
Priority items to confirm · 3
01Dynamic records availableUnconfirmed
Are resistance or continuity logs available at sufficient sampling rates and aligned to the thermal-cycle timeline?
Room-temperature endpoints can miss reversible opens and cannot identify representative sampling times.
Update engineering conditions →02Mapped and repeatableUnconfirmed
Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?
Repeatable locations prioritize targeted sections and model regions but do not prove crack causation.
Update engineering conditions →03Primary inputs completeUnconfirmed
Are actual RDL geometry, layer thicknesses, and temperature-dependent thermomechanical properties complete?
Public cases suggest comparison directions but cannot replace this package's geometry and material inputs.
Update engineering conditions →Relevant assessment paths
Assessment preparation checklist
Discussion preparation based on the relevant engineering conditions; not mandatory supplier requirements or a record of evidence already available.
- Dynamic records available
- Mapped and repeatable
- Primary inputs complete
Check the comparison table above for each solution’s specific inputs and applicability limits.
Questions to discuss
- Can in-cycle anomalies be mapped to fixed nets, RDL layers, and physical regions?
- Does the model use actual stackup and temperature-dependent materials with measured calibration?
- Does physical analysis include abnormal locations and same-layout good controls?
Public references · 12
- ASE · Fine-Line RDL Structure Analysis of Fan-Out Chip-on-Substrate Platform ↗
View source notes and limits
Research calibrates FOCoS 3D models with measurements and reports correlations between increasing RDL layers, wafer warpage, and specific RDL stresses.
Results depend on a specific FOCoS structure and simulation setup. They do not prove sample cracks or provide lifetime directly.
- ASE · Failure Analysis Lab ↗
View source notes and limits
The official page lists electrical tests, TDR, OBIRCH, thermal lock-in, X-ray, SAT, sections, FIB, and SEM localization / physical analysis.
The capability list guarantees no resolution, success rate, or method combination for this fine-line RDL.
- Fraunhofer IZM · Reliability Investigation of Ultra Fine Line, Multi-Layer Copper Routing ↗
View source notes and limits
The institutional abstract describes expansion-mismatch stress in fine multilayer Cu RDL crossing different substrates and investigates plated-Cu mechanical properties.
The abstract is not this case's material test and provides no directly applicable failure threshold.
- Keysight Technologies · B2902C four-wire contact-resistance measurement ↗
View source notes and limits
Keysight's resistance page lists B2902C; the B2900C/CL guide explains Kelvin connections, lead error and resistance compensation.
Scope and limitations Four-wire sensing does not isolate a buried contact without separate terminals. Fixtures and settings affect accuracy; capture of every transient open is not guaranteed. What to prepare BLNKK suggests structure and terminal drawings, expected resistance, allowable test current, temperature conditions and repeated measurements. Confirm with the supplier Confirm Kelvin fixtures, current/integration settings, thermal-EMF compensation, system uncertainty and time resolution.
- Sumitomo Bakelite · SUMIRESIN EXCEL CRC-8600 WLP redistribution dielectric ↗
View source notes and limits
The named RDL subsection describes resolution, UBM adhesion and solvent resistance; these properties do not qualify the actual package for thermal cycling.
Scope and limitations Material selection cannot locate or repair existing opens. General properties do not replace stress, adhesion and electrical validation of actual films/interfaces. What to prepare BLNKK suggests documenting grades, UBM, films, patterns, exposure/development and curing, with before/after cycling open-location, interface and electrical evidence. Confirm with the supplier Confirm grades, processing windows, temperature-dependent properties, interface compatibility and applicable reliability-test conditions/results.
- Toho Technology · TohoSpec 3100 film-thickness inputs for RDL models ↗
View source notes and limits
The actual two-page specification describes models, objectives and configurations; the current directory still lists TohoSpec3100.
Scope and limitations Standard, thick-film and optional-objective specifications differ; oxide-on-silicon ranges do not apply to all materials. Thickness analysis does not directly measure stress or electrical opens. What to prepare BLNKK suggests preparing layer order, materials, nominal thicknesses, optical constants, accessible sites and reference thickness/section data. Confirm with the supplier Confirm current configuration/availability, objective/spot, identifiable layer count and fitting model; discuss repeatability and uncertainty for actual stacks.
- Shin-Etsu MicroSi · Shin-Etsu MicroSi SINR photoimageable dielectric ↗
View source notes and limits
The current catalog lists SINR; a SPIE 2006 study documents named SINR3150HSM processing.
Scope and limitations Historical grade/process results do not qualify all current SINR or prove prevention of thermal opens or repair of cracked RDL. What to prepare BLNKK suggests preparing grade, cure history, modulus/CTE, shrinkage, moisture and adhesion data alongside stack/electrical controls. Confirm with the supplier Confirm current-grade data, pattern/cure conditions, metal compatibility and representative-stack cycling/interface validation.
- Rigaku · SmartLab SE XRD analysis of thin-film residual stress and texture ↗
View source notes and limits
XRD 2001, dated July 2026, uses SmartLab SE, HyPix-400 and χφ for texture-aware Au stress estimation.
Scope and limitations The example does not validate every film/region. Signals, texture, sampling and elastic assumptions affect interpretation; lattice stress is not package warpage. What to prepare BLNKK suggests supplying film/thickness, substrate, process history, region, texture and comparison samples/shape data. Confirm with the supplier Confirm optics/attachments, diffraction planes, method, sampling scale, elastic data, stress assumptions and uncertainty.
- Synopsys · Sentaurus Interconnect process-history stress and interconnect reliability simulation ↗
View source notes and limits
The current page and 2025 brochure document full stress history/global-local submodeling. A 2011 newsletter demonstrates cyclic solder viscoplasticity.
Scope and limitations The historical example has specific geometry/material assumptions. Failure/lifetime estimates need calibrated models, not direct transfer to other products. What to prepare BLNKK suggests preparing layout/geometry, materials/interfaces, process sequence/temperature, loads, locations and calibration data. Confirm with the supplier Confirm current versions and model licenses, process-stress and global-to-local transfer methods, parameter calibration, and how lifetime estimates should be compared with tests.
- TOPPAN · T-RECS low-CTE coreless organic interposer ↗
View source notes and limits
The supplier publishes T-RECS structure/targets and describes CTE approximately 45% below conventional packaging substrates. The complete comparison/test basis is not specified, so this does not establish warp or crack improvement in a customer package.
Scope and limitations Published architecture/development targets are not production design rules or reliability qualifications. Low CTE and electrical testing alone do not guarantee low package warp, crack-free operation or assembly yield. What to prepare BLNKK recommends preparing die layout, I/O/bandwidth needs, substrate/interposer geometry, RDL/TMV requirements and assembly thermal histories. Include existing crack, warp and electrical data to compare architectures and validation plans. Confirm with the supplier Confirm sampling/co-development status, current dimensions/design rules, CTE temperature/reference conditions and electrical-test coverage. Discuss assembly and moisture/thermal-cycle qualification, distinguishing targets from available specifications.
- Advantest · TS9001 high-resolution TDR fault localization for advanced packages ↗
View source notes and limits
The current discontinued list and its November 2023 catalog mark TS9001 as sales ended. The catalog specifies <5 µm fault-area resolution over 0–800 ps and 30 seconds per point for 1,024 averages, excluding probe touchdown. These are not universal location accuracy or total test time.
Scope and limitations Sales have ended; new supply and support cannot be assumed. Requires an electrically accessible network and suitable reference; resolution is not universal location accuracy. What to prepare BLNKK suggests failed/good samples, routing geometry/dielectric data, probe access and failure conditions to preserve. Confirm with the supplier Confirm maintenance, calibration, probe/software compatibility and available follow-up analysis or alternative services.
- FUJIFILM Electronic Materials · LTC 9300 low-temperature-cure RDL polyimide ↗
View source notes and limits
The page and three technical sheets marked ©2023 document grades, processing windows and cure-dependent typical properties. They do not qualify customer-stack warpage or continuity.
Scope and limitations Cure ranges, film thickness and exposure methods vary by grade; typical properties depend on curing. NMP-free does not mean solvent-free development or guaranteed warpage/open prevention. What to prepare BLNKK recommends preparing grade, film/metal stack, pattern/vias and exposure/development/thermal history. Include material, adhesion, moisture and thermal-cycle continuity data for validation planning. Confirm with the supplier Confirm current grade, thickness/lithography windows, developer/rinse and cure time/atmosphere. Request properties and reliability conditions for the selected cure, plus sample availability.
Full assessment recordExpand for all conditions, path rules and original assessment notes.
Current assessment and next steps
Based on reported conditions and public sources. Ready to assess does not establish sample applicability or root cause. Order does not identify the best solution.
Known conditions · 0
Key unknowns · 3
- Are resistance or continuity logs available at sufficient sampling rates and aligned to the thermal-cycle timeline?Room-temperature endpoints can miss reversible opens and cannot identify representative sampling times.
- Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?Repeatable locations prioritize targeted sections and model regions but do not prove crack causation.
- Are actual RDL geometry, layer thicknesses, and temperature-dependent thermomechanical properties complete?Public cases suggest comparison directions but cannot replace this package's geometry and material inputs.
Paths to assess
Dynamic electrical and RDL-location correlation
Complete the thermal-cycle electrical timeline and net-to-layout mapping first.
- Are resistance or continuity logs available at sufficient sampling rates and aligned to the thermal-cycle timeline?
- Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?
Conditions that change this path
- Are resistance or continuity logs available at sufficient sampling rates and aligned to the thermal-cycle timeline?Supports assessment: Dynamic records available · Unsuitable for now: Only endpoints or scattered measurements
- Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?Supports assessment: Mapped and repeatable
RDL-stackup thermomechanical analysis
Complete location correlations, RDL geometry, and material curves before local modeling.
- Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?
- Are actual RDL geometry, layer thicknesses, and temperature-dependent thermomechanical properties complete?
Conditions that change this path
- Can abnormal nets be mapped to consistent RDL layers, vias, bends, or die / mold boundaries?Supports assessment: Mapped and repeatable · Unsuitable for now: Scattered locations or no consistent region
- Are actual RDL geometry, layer thicknesses, and temperature-dependent thermomechanical properties complete?Supports assessment: Primary inputs complete · Unsuitable for now: Key inputs missing
What to do next
No result provided. Clarify key conditions before arranging an assessment.
- Are resistance or continuity logs available at sufficient sampling rates and aligned to the thermal-cycle timeline?
What to prepare
- Dynamic electrical data, netlists, layouts, and abnormal / good samples
- Actual geometry, material curves, thermal history, and calibration measurements
- Material batch, geometry, substrate interfaces, and thermal history
- Suitable for low-resistance devices or test structures with accessible measurement terminals. Kelvin-via and RDL structures need corresponding connection layouts.
- Supplier-listed WLP redistribution layers, after confirming the selected grade, UBM, thickness, geometry and processing/cure flow.
- Films need identifiable reflected signals; validate materials, layer count and configuration for oxide, nitride and resist stacks.
- Evaluate material selection with current grade/cure/interface data and representative stack coupons.
- For films with measurable diffraction; the documented example is Au on silicon. Confirm other packaging films/regions. Crystalline target metal, film accessibility, diffraction volume/texture and elastic constants
- For BEOL, TSV and chip-package interaction studies; confirm models/parameters for solder nonlinearity or lifetime work. RDL/via geometry, process recipes, residual stress and validated material parameters
- The architecture targets multi-die/chiplet integration and large packages. The official page lists structures and target specifications; available sizes, layers, routing rules and assembly conditions require development-program confirmation. RDL line/via geometry and package stack Resin/CTE/modulus and thermal history Open coordinates and thermal/mechanical correlation
- Sales have ended; support for existing equipment requires confirmation. Historical applications include flip-chip BGA, WLP and 2.5D/3D IC. Accessible net/layout and persistent fault condition Probe/fixture calibration and propagation velocity Reference trace and temperature-linked continuity history
- Targets advanced-packaging RDL. E07, E19 and E76B have separate data; E76B lists LDI capability that is not assigned across the series. Provide grade, film/metal geometry, cure/moisture history, modulus/CTE/shrinkage and thermal continuity data.
Questions to discuss
- Can in-cycle anomalies be mapped to fixed nets, RDL layers, and physical regions?
- Does the model use actual stackup and temperature-dependent materials with measured calibration?
- Does physical analysis include abnormal locations and same-layout good controls?
Public references
ASE · Fine-Line RDL Structure Analysis of Fan-Out Chip-on-Substrate Platform ↗Results depend on a specific FOCoS structure and simulation setup. They do not prove sample cracks or provide lifetime directly.
ASE · Failure Analysis Lab ↗The capability list guarantees no resolution, success rate, or method combination for this fine-line RDL.
Fraunhofer IZM · Reliability Investigation of Ultra Fine Line, Multi-Layer Copper Routing ↗The abstract is not this case's material test and provides no directly applicable failure threshold.
Keysight Technologies · B2902C four-wire contact-resistance measurement ↗Scope and limitations Four-wire sensing does not isolate a buried contact without separate terminals. Fixtures and settings affect accuracy; capture of every transient open is not guaranteed. What to prepare BLNKK suggests structure and terminal drawings, expected resistance, allowable test current, temperature conditions and repeated measurements. Confirm with the supplier Confirm Kelvin fixtures, current/integration settings, thermal-EMF compensation, system uncertainty and time resolution.
Sumitomo Bakelite · SUMIRESIN EXCEL CRC-8600 WLP redistribution dielectric ↗Scope and limitations Material selection cannot locate or repair existing opens. General properties do not replace stress, adhesion and electrical validation of actual films/interfaces. What to prepare BLNKK suggests documenting grades, UBM, films, patterns, exposure/development and curing, with before/after cycling open-location, interface and electrical evidence. Confirm with the supplier Confirm grades, processing windows, temperature-dependent properties, interface compatibility and applicable reliability-test conditions/results.
Toho Technology · TohoSpec 3100 film-thickness inputs for RDL models ↗Scope and limitations Standard, thick-film and optional-objective specifications differ; oxide-on-silicon ranges do not apply to all materials. Thickness analysis does not directly measure stress or electrical opens. What to prepare BLNKK suggests preparing layer order, materials, nominal thicknesses, optical constants, accessible sites and reference thickness/section data. Confirm with the supplier Confirm current configuration/availability, objective/spot, identifiable layer count and fitting model; discuss repeatability and uncertainty for actual stacks.
Shin-Etsu MicroSi · Shin-Etsu MicroSi SINR photoimageable dielectric ↗Scope and limitations Historical grade/process results do not qualify all current SINR or prove prevention of thermal opens or repair of cracked RDL. What to prepare BLNKK suggests preparing grade, cure history, modulus/CTE, shrinkage, moisture and adhesion data alongside stack/electrical controls. Confirm with the supplier Confirm current-grade data, pattern/cure conditions, metal compatibility and representative-stack cycling/interface validation.
Rigaku · SmartLab SE XRD analysis of thin-film residual stress and texture ↗Scope and limitations The example does not validate every film/region. Signals, texture, sampling and elastic assumptions affect interpretation; lattice stress is not package warpage. What to prepare BLNKK suggests supplying film/thickness, substrate, process history, region, texture and comparison samples/shape data. Confirm with the supplier Confirm optics/attachments, diffraction planes, method, sampling scale, elastic data, stress assumptions and uncertainty.
Synopsys · Sentaurus Interconnect process-history stress and interconnect reliability simulation ↗Scope and limitations The historical example has specific geometry/material assumptions. Failure/lifetime estimates need calibrated models, not direct transfer to other products. What to prepare BLNKK suggests preparing layout/geometry, materials/interfaces, process sequence/temperature, loads, locations and calibration data. Confirm with the supplier Confirm current versions and model licenses, process-stress and global-to-local transfer methods, parameter calibration, and how lifetime estimates should be compared with tests.
TOPPAN · T-RECS low-CTE coreless organic interposer ↗Scope and limitations Published architecture/development targets are not production design rules or reliability qualifications. Low CTE and electrical testing alone do not guarantee low package warp, crack-free operation or assembly yield. What to prepare BLNKK recommends preparing die layout, I/O/bandwidth needs, substrate/interposer geometry, RDL/TMV requirements and assembly thermal histories. Include existing crack, warp and electrical data to compare architectures and validation plans. Confirm with the supplier Confirm sampling/co-development status, current dimensions/design rules, CTE temperature/reference conditions and electrical-test coverage. Discuss assembly and moisture/thermal-cycle qualification, distinguishing targets from available specifications.
Advantest · TS9001 high-resolution TDR fault localization for advanced packages ↗Scope and limitations Sales have ended; new supply and support cannot be assumed. Requires an electrically accessible network and suitable reference; resolution is not universal location accuracy. What to prepare BLNKK suggests failed/good samples, routing geometry/dielectric data, probe access and failure conditions to preserve. Confirm with the supplier Confirm maintenance, calibration, probe/software compatibility and available follow-up analysis or alternative services.
FUJIFILM Electronic Materials · LTC 9300 low-temperature-cure RDL polyimide ↗Scope and limitations Cure ranges, film thickness and exposure methods vary by grade; typical properties depend on curing. NMP-free does not mean solvent-free development or guaranteed warpage/open prevention. What to prepare BLNKK recommends preparing grade, film/metal stack, pattern/vias and exposure/development/thermal history. Include material, adhesion, moisture and thermal-cycle continuity data for validation planning. Confirm with the supplier Confirm current grade, thickness/lithography windows, developer/rinse and cure time/atmosphere. Request properties and reliability conditions for the selected cure, plus sample availability.