Overview
Semiconductor white cards are precision-engineered substrates critical to microelectronics manufacturing. These flat, rigid plates serve as temporary work surfaces for silicon wafers during photolithography, probing, and inspection processes. Developed to meet stringent cleanroom standards, they prevent contamination while offering exceptional dimensional stability. Modern white cards typically measure between 150mm to 300mm in diameter, matching standard wafer sizes. Their non-reflective white surface enhances optical alignment accuracy during lithography. Leading manufacturers often apply proprietary coatings to reduce static and improve wear resistance in high-volume production environments.
Structure and Working Principle
White cards feature a monolithic ceramic structure with ultra-fine surface finishes (Ra < 0.2μm). The base material composition determines thermal conductivity (5-150 W/mK) and coefficient of thermal expansion (CTE), which must closely match silicon wafers to prevent stress-induced defects. During operation, the card functions as both mechanical support and thermal buffer. In probing applications, its dielectric properties prevent signal interference while dissipating heat from test procedures. Advanced versions incorporate embedded RF shielding or heating elements for specialized testing requirements.
Key Features
High-purity materials (≥99.6% Al2O3) ensure minimal ionic contamination that could affect semiconductor yields. The surface undergoes laser ablation or precision grinding to achieve flatness within 5μm/m², critical for nanoscale patterning accuracy. Temperature resistance up to 1600°C allows use in CVD and diffusion processes. Some grades offer controlled porosity (0.5-3%) to enhance vacuum chucking performance. Anti-static variants (surface resistivity 10^6-10^9 Ω/sq) prevent charge buildup during automated handling.
Application Areas
Primary applications include front-end semiconductor fabrication (FEOL) where they serve as temporary carriers during thin wafer processing. Probe card manufacturers use them as reference substrates for contact resistance calibration. In back-end (BEOL) operations, white cards facilitate package-level testing and burn-in procedures. Emerging uses include microLED transfer processes and advanced packaging techniques like fan-out wafer-level packaging (FOWLP), where their thermal stability prevents warpage.
Maintenance and Precautions
Regular surface inspections with interferometers detect wear patterns affecting flatness. Cleaning requires specialized protocols—typically CO2 snow or low-particle ultrasonic baths with semiconductor-grade solvents. Storage should maintain Class 1000 or better cleanroom conditions. Thermal cycling beyond manufacturer specifications (usually >200°C/min) may cause microcracking. Users should implement glovebox handling to prevent alkali contamination from skin contact.
B2B Procurement Guide
Technical specifications should prioritize CTE matching (typically 6.5-7.5 ppm/°C for silicon processes) over cost considerations. For EUV lithography applications, verify low outgassing certifications (<0.1% TML). Lead times for custom configurations often exceed 12 weeks—plan procurement accordingly. Tier 1 suppliers typically offer lot traceability with material certificates (RoHS, REACH compliant). Consider leasing programs for high-value metrology-grade cards used in calibration applications.
Related Manufacturers
- 主营：ic卡、磁条卡、智能卡、芯片卡、会员卡
- 主营：rfid、rfid电子标签、电子标签、餐盘芯片、rfid标签、rfid读写器、rfid手持终端、耐高温电子标签、rfid水洗标签、rfid洗涤标签、rfid抗金属标签、nfc标签、pcb抗金属标签、射频识别、有源卡、rfid手持机、智能卡、rfid扎带标签、rfid阅读器、rfid工具管理、rfid硅胶腕带、rfid特种标签、钉子标签、尼龙扎带、抗金属电子标签
- 主营：PVC卡、RFID洗涤标签、RFID纸卡、芯片白卡、RFID资产管理标签、NFC卡、IC卡、RFID腕带、塑料环保卡
- 主营：读写卡模块、读卡模块、SAM卡读写、读卡芯片、读卡器、IC卡
- 主营：NFC读卡器、超高频读卡器、电动发卡机、72芯片白卡、车载小键盘、RFID网络读卡器、工业读写头、密码键盘、密码小键盘、读码器、密码输入器、PDA、刷卡器、管道定位器、电子标识器、电子标识定位器、激光避障传感器、激光避障雷达、电子标识探测仪、磁导航传感器、护照阅读器、光通讯模块、光数据传输器、触摸屏刷卡机、半导体专用读卡器、激光测距仪
- 主营：移动联通SIM测试卡、手机耦合测试卡、磁条卡、IC ID芯片卡、复合卡、滴胶卡、钥匙扣、RFID标签
- 主营：rfid电子标签、rfid读写器、rfid 打印机、rfid pda、rfid 手持机
- 主营：健康体检管理系统、证卡打印机、健康证自助办证机、宝瑞迪芯片卡、PVC卡类印刷、读者证、健康证卡、Rfid高频超高频图书标签、从业人员健康体检管理软件、健康证自助证卡打印机、从业人员健康管理系统、从业人员电子健康证、体检管理系统、校园一卡通、光缆吊牌卡、磁条卡、健康证、体检系统、PVC证卡打印机、国产证卡打印机、人像卡证卡打印机、从业人员体检管理系统、义齿质保卡、便携式一体机、社保卡打印机、桌面式打印机
- 主营：pcb材料、钱币卡、标签卡、pvc白卡、超高频、标签abs、滴胶卡、213标签、图书馆、nfc电子、pvc腕带、nfc扎带、nfc防伪、读卡器、圆币卡、门禁卡、nfc标签、fpc材料、异形卡、纽扣卡、nfc门票、abs电子、人像卡、双频卡、印刷标
- 主营：证卡打印机、卡片打印机、工作证打印机
- 主营：超高频手持机、ABS标签、借阅卡、高频白卡、滴胶卡、智能卡、rfid标签、纽扣标签、PCB标签、资产管理标签、柔抗标签、洗涤标签、超高频标签、RFID图书标签、书架标签、PCB抗金属标签、NFC标签、水洗标签、服装标签、图书电子标签、ABS抗金属标签、高频标签、层架标签、电子标签、光盘标签、柔性抗金属标签
- 主营：食堂刷卡消费机、食堂人脸消费机、门禁闸机、IC白卡定制图案、水控刷卡机
- 主营：会员卡、酒店房卡、智能卡、IC芯片卡、电子标签、IC卡
- 主营：连号ID白卡、RFID标签、NFC标签、智能卡
- 主营：RFID标签、智能卡、RFID读写器、智能手环、NFC标签、UHF抗金属标签、电子标签、FPC标签、耐高温标签、NFC手腕带、IC门禁卡、NFC电子标签