What It Is
A Thermal Test Vehicle (TTV) is a non-functional, structurally identical silicon or mechanical emulator engineered to mirror the precise thermal behavior, package dimensions, mechanical boundaries, and heat flux profiles of live integrated circuits (ICs).
Rather than deploying expensive, unreleased, or fragile production silicon (such as high-end CPUs, ASICs, or next-generation GPUs) during early architectural validation, a TTV utilizes integrated heating elements and internal temperature sensors to mimic exact heat generation. Heatscape designs and manufactures standard, board-level, and reference chip TTV platforms capable of replicating thermal loads spanning from 1W to over 1000W+ with specialized, localized hot spots.
When to Use It
Hardware development cycles require thermal validation long before final silicon is fabrication-ready or commercially viable. You should integrate TTV design and manufacturing when:
- Testing High-Density Power Architecture: Validating advanced cooling mechanisms for 1000W+ GPUs or AI clusters where local heat flux densities reach up to 200W/cm².
- Mitigating Prototype Risk: Preventing physical or electrical damage to high-cost live components during early-stage, destructive, or stress-limit thermal testing.
- Correlating Mechanical Co-Design: Evaluating structural clamping pressures, bolting configurations, and Thermal Interface Material (TIM) compression behaviors under active thermal expansions without risking live board short circuits.
- Reference Architecture Compliance: Validating platforms against rigorous industry-standard footprints, such as AMD Reference TTV designs.
💡 Engineering Tip: Do not just focus on overall TDP (Thermal Design Power). When commissioning a TTV, map out the localized die geography. Simulating non-uniform heat loads—where 80% of the heat is generated across 20% of the die area—is crucial for identifying localized dry-outs in vapor chambers or micro-channel cold plates.
Required Design Inputs
To develop a custom TTV that mechanically and thermally aligns with your final production environment, our engineering team requires the following specifications:
- Package and Die Footprint: Detailed mechanical dimensions, lid/IHS (Integrated Heat Spreader) geometry, substrate thickness, and ball grid array (BGA) height profile.
- Heat Flux Mapping: Precise internal heat zone locations, maximum power targets (total Watts), and specific hot-spot dimensions.
- Sensor Strategy: Preferred quantity and layout of internal thermal sensors (diodes or resistance temperature detectors – RTDs) for local junction temperature ($T_j$) mapping.
- Mechanical Interface and Keep-Out Zones (KOZ): Clamping force requirements, mounting bolt patterns, and surrounding board component heights to ensure mechanical drop-in compatibility.
The TTV Manufacturing Process
- Co-Design & Simulation: We establish the internal resistor layout or silicon-heater architecture to map your exact power densities and sensor layout.
- Precision Substrate & Interposer Fabrication: The TTV is built utilizing high-conductivity base substrates and precise mechanical packages matching the final IC form factor.
- Sensor & Lead Integration: Thermocouple connections or RTD sensors are embedded within critical heat zones to provide micro-second level temperature response tracking.
- Calibration & Verification: Every TTV is calibrated within our Advanced Thermal Testing Facility to verify linear resistance-to-temperature tracking curves prior to delivery.
- System Integration Support: We supply custom flexible test rigs or mounting hardware configurations tailored to secure the emulator onto your validation boards safely.
Applications
Our custom TTV solutions bridge the gap between design theory and hardware deployment across demanding fields:
- Data Center & AI Computing: Replicating the extreme heat signatures of modern AI accelerator modules to evaluate macro-level server rack liquid loops.
- Board-Level Environmental Simulations: Designing whole-board emulators that populate all heat-producing auxiliary components on a PCB to test airflow dynamics inside tightly sealed enclosures.
- Next-Gen Heatsink Characterization: Testing the true boundary performance limits of advanced thermal architectures, verifying how custom Vapor Chamber Heatsinks or high-density Skived & Microskiving Heatsinks handle high localized heat spikes.
Validate Your Thermal Design Safely
Accelerate your time-to-market and protect your high-value silicon assets with an accurately modeled emulator.
Contact Our TTV Engineering Team Today to request a custom design quote or to learn more about our comprehensive prototyping capabilities.
