English Product Name

Overview

The OK-PTC Series HAST (Highly Accelerated Stress Test) Aging Test Chamber is an engineered environmental simulation system designed for rapid reliability assessment of electronic components, printed circuit boards (PCBs), semiconductor packages, and hermetic seals under extreme temperature, humidity, and pressure conditions. Operating on the principle of saturated steam pressurization, the chamber elevates ambient pressure above atmospheric levels—typically up to 2.8 kg/cm² gauge—to accelerate moisture diffusion into micro-defects, thereby replicating years of field-level degradation in hours or days. Unlike standard damp heat testing (e.g., 85°C/85% RH), HAST leverages elevated partial pressure of water vapor at temperatures between 100°C and 132°C to induce failure mechanisms such as corrosion, intermetallic growth, wire bond degradation, and delamination—enabling rigorous qualification per JEDEC JESD22-A110 and A118 standards. The OK-PTC platform supports both non-destructive screening and failure analysis workflows in QC laboratories, R&D centers, and contract manufacturing facilities requiring ISO/IEC 17025-compliant test execution.

Key Features

• Microprocessor-controlled PID + SSR regulation system ensures stable saturation control of steam temperature and pressure, minimizing thermal overshoot and maintaining process repeatability across test cycles.
• Dual-sensor monitoring architecture: Pt100 platinum resistance thermometer (Class A accuracy) for precise temperature feedback; calibrated analog pressure gauge with digital readout for real-time gauge pressure tracking.
• Integrated automatic water replenishment system maintains optimal water level during extended tests—critical for uninterrupted steam generation and avoidance of dry-heating events that compromise heater longevity and test validity.
• Stainless steel inner chamber (SUS304) with electropolished interior surface resists oxidation, facilitates cleaning, and prevents particulate shedding—essential for cleanroom-compatible operation and contamination-sensitive device testing.
• Magnetic-drive fan assembly enables passive steam convection without mechanical shaft penetration, eliminating seal wear and ensuring long-term pressure integrity at elevated operating conditions.
• Self-diagnostic fault detection alerts operators via visual/audible signals for anomalies including low water, overtemperature, overpressure, or heater open-circuit conditions—supporting GLP-aligned operational traceability.

Sample Compatibility & Compliance

The OK-PTC series accommodates a broad range of sample geometries—including IC packages (QFP, BGA, CSP), automotive ECUs, MEMS sensors, and encapsulated optoelectronic modules—within its cylindrical chamber configurations (Ø250 × 450 mm and Ø350 × 500 mm). Its design conforms to internationally recognized test methodologies, including ASTM D2247 (Standard Practice for Testing Paints Under Condensing Moisture Conditions), IEC 60068-2-66 (Test Db: Damp Heat, Steady State, Accelerated), and JIS C 60068-2-66. It also supports validation against JEDEC JESD22-A110 (HAST, Unbiased) and JESD22-A118 (Biased HAST), with full compatibility for audit-ready documentation required under ISO 9001:2015 and IATF 16949 quality management systems. All units undergo factory calibration per ISO/IEC 17025 procedures, with optional NIST-traceable certification available upon request.

Software & Data Management

While the base configuration features a standalone LED controller with manual parameter entry, optional RS-485/Modbus RTU interface enables integration with laboratory data acquisition platforms (e.g., LabVIEW, WinCC, or custom SCADA). Real-time logging of temperature, pressure, and elapsed time is supported via external DAQ hardware, allowing synchronization with product-specific pass/fail criteria. For regulated environments, optional software packages provide 21 CFR Part 11-compliant user access control, electronic signatures, and immutable audit trails—including timestamped event logs for all setpoint changes, alarm triggers, and cycle completions. All firmware revisions are version-controlled and documented to support GMP/GLP audit readiness.

Applications

• Qualification of moisture sensitivity level (MSL) for plastic-encapsulated microcircuits prior to reflow soldering.
• Reliability screening of automotive-grade electronics subjected to under-hood thermal-humidity cycling.
• Failure mode analysis of gate oxide integrity in power MOSFETs and SiC devices under high-voltage bias during HAST exposure.
• Validation of conformal coating performance (e.g., acrylic, silicone, parylene) against moisture ingress under accelerated stress.
• Process capability studies for wafer-level packaging technologies, including TSV and fan-out wafer-level packaging (FOWLP).

FAQ

What is the maximum allowable test duration for continuous HAST operation?

The chamber is rated for uninterrupted operation up to 96 hours per cycle, contingent upon proper maintenance, adequate water supply, and adherence to recommended cooling intervals between successive runs.

Does the system support biased HAST testing?

Yes—when integrated with external DC bias supplies and signal routing fixtures, the OK-PTC chamber meets JEDEC JESD22-A118 requirements for electrically stressed HAST protocols.

Is third-party calibration documentation included with shipment?

A factory calibration report (traceable to national standards) is provided; NIST-traceable certification with uncertainty budgets may be added as a configurable option.

Can the chamber operate at sub-atmospheric pressure for specialized vacuum-HAST variants?

No—the OK-PTC series is configured exclusively for positive-pressure saturated steam environments; vacuum-capable variants require custom engineering and are not part of the standard product line.

How frequently should the water reservoir and steam lines be cleaned to prevent mineral buildup?

Deionized water is mandatory; routine descaling using citric acid solution is recommended every 200 operational hours or per quarterly preventive maintenance schedule.