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PCB Surface Finishes Comparison: HASL LF, OSP, & ENIG

 A PCB surface finish is a coating between a component and a bare board PCB. It is applied for two basic reasons: to ensure solderability, and to protect exposed copper circuitry. As there are many types of surface finishes, selecting the right one is no easy task, especially as surface mounts have become more complex and regulations such as RoHS and WEEE have changed industry standards. Criteria Consider the following: Lead vs. Lead free* Component Type* Cost * Reworkability Productivity Environment HASL and lead-free HASL For decades HASL was one of the most popular surface finish choices. Yet, in recent years, manufacturers have realized its limitations. While a surface finish may be low cost and robust, fundamental changes in the PCB industry—namely, the rise complex surface mount technology—have exposed its shortcomings. HASL leaves uneven surfaces and is not suitable for fine pitch components. Although it does come in lead-free, there are other lead-free options which will ...
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RF PCB – Radio Frequency Printed Circuit Boards

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  Radio frequency printed circuit boards ( RF PCBs ) are an exciting, fast growing sector of the PCB manufacturing industry. They are also incredibly complex with a dizzying range of options. The engineers at San Francisco Circuits can assist you with every step of the fabrication and assembly process, including material selection and key RF PCB manufacturing challenges to be aware of. What is an RF Circuit Board? In general terms, the PCB industry considers an RF circuit board to be any high frequency PCB that operates above 100MHz. Within the radio frequency class, anything above 2GHz is a Microwave PCB. What is a Microwave PCB? The main difference between RF circuit boards and Microwave PCBs is in the radio frequency in which they operate. Microwave PCBs are classified as any RF circuit board operating above 2GHz. RF circuit boards and Microwave PCBs are used for communication signals in any application that requires receiving and transmitting radio signals. For example, some co...
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IT-968G Data sheet rev 1.0-20

IT-968G The IT-968G is an advanced low CTE, high Tg (175° C by TMA), Halogen free and ultra low loss material. This material is designed not only for standard multilayer PWBs, but also for high speed data rate application, like the switch (100G), Base station application. IT-968G SI performance is stable with variety environment condition, it is also exhibit high thermal and CAF reliability. Application Server/Storage/Switch Backplane Telecom Base station Key Features Halogen free material 100G/400G Switch solution Advanced high Tg resin technology Lower Dk (3.59 @ 10GHz) and Ultra low Df (0.0050 @ 10GHz) Stable Dk/Df with different environment condition Compatible with modified FR-4 processes High thermal & CAF reliability Property Items Methods IT-968G Tg (℃) TMA 175 T-288 (w/ 1 Oz Cu, min) TMA >60 Td-5%(℃ ) TGA 5% loss 400 CTE (ppm/℃) a1/a2 45/260 CTE (%), 50-260℃ TMA 2.3 Dk @ 10 GHz (RC 55%) IPC TM-650 2.5.5.13 3.59 Df @ 10 GHz (RC 55%) IPC TM-650 2.5.5.13 0.0050 If you hav...
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