Semiconductor Cleanroom's Key Points

As core infrastructure of semiconductor manufacturing, semiconductor cleanrooms must adhere to high-precision standards in their design, construction, and operation to create a pollution-free environment and ensure the yield of chip production. The key points can be summarized as follows:

• Cleanliness level is the core indicator, requiring compliance with ISO 14644-1 standards. Real-time monitoring and recording should be performed every minute using a particle counter. Temperature and humidity must be precisely controlled, maintaining 22°C±0.5°C and 45%±5% RH, with fluctuations not exceeding 0.1°C/hour and 3% RH/hour, respectively. Stability is ensured through precision air conditioning and redundant equipment.
• Pressure control employs positive pressure gradient design, with pressure difference ≥15 Pa between the main clean area and adjacent areas, and ≥25 Pa between critical process areas and corridors. Airflow follows unidirectional laminar flow pattern with velocity of 0.45 m/s ± 0.1m/s, equipped with ULPA or HEPA filters (leakage rate <0.01%).
• Inner surfaces must be made of smooth, non-porous antistatic materials, with sealed seams. Equipment and furniture must meet cleanroom compatibility standards. Personnel enter and exit through an airlock, wearing cleanroom garments, and undergo an air shower at ≥20 m/s for ≥15 seconds. Materials are transferred through double layer pass box or an automatic airlock system, requiring cleaning before entry.
• Environmental monitoring relies on a distributed sensor network, sampling parameters such as particulate matter, temperature, humidity, and differential pressure every minute. Sensors are calibrated every 6 months, achieving accuracies of ±0.1°C for temperature, ±2% RH for humidity, and ±1 Pa for differential pressure. Vibration and static electricity must be strictly controlled: floor vibration velocity ≤25μm/s, surface potential maintained within ±100V, and ionization equipment balance voltage deviation ≤±10V.
• Lighting uses sealed, dustproof, dedicated lamps with an illuminance of 500-1000 lux and uniformity ≥0.8; noise is controlled to ≤65dB(A), reduced to ≤55dB(A) in sensitive areas. Maintenance and validation must be routine: filters are replaced every 3-6 months, surfaces are cleaned daily, the system is calibrated every 6 months, and comprehensive performance verification is performed annually.

These key points cover the core technical parameters of cleanrooms and are applicable to critical stages such as wafer manufacturing, packaging, and testing. In practical applications, risk assessments and dynamic optimizations must be conducted in conjunction with the plant design to ensure the cleanroom continuously meets the high reliability requirements of semiconductor production.

Suzhou Pharma Machinery Co.,Ltd.

2026/02/27

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