Technical Library | 2024-09-02 17:31:09.0
The cracking and delamination of printed circuit boards (PCB) during exposure to elevated thermal exposure, such as reflow and rework, have always been a concern for the electronics industry. However, with the increasing spread of Pb-free assembly into industries with lower volume and higher complexity, the occurrence of these events is increasing in frequency. Several telecom and enterprise original equipment manufacturers (OEMs) have reported that the robustness of their PCBs is their number one concern during the transition from SnPb to Pb-free product. Cracking and delamination within PCBs can be cohesive or adhesive in nature and can occur within the weave, along the weave, or at the copper/epoxy interface (see Figure 1). The particular role of moisture absorption and other PCB material properties, such as out of plane expansion on this phenomenon is still being debated.
Equipment used in the physical and electrical measurements of semiconductors and their components. Includes atomic absorption tools, thickness measurement tools, x-ray fluorescence (XRF) tools, mapping tools, microscopes, photovoltage measurement to
The unique electrical, thermal and mechanical properties of aluminum combined with Polyonics proven coating, adhesive and manufacturing technologies provide high quality tape material ideal for high temperature applications. In particular, Polyonics
Product Name: SMT Stencil Roll Part No:HT16 Size:made according to you(DEK/MPM/PANA and so on) Qty:1roll/pc Color: White Product Origin: China Brand Name: Neutral Price Terms: FOB Shenzhen Payment Terms: T/T 100% in advance Minimum Order: According t
New Equipment | Board Handling - Pallets,Carriers,Fixtures
Stentech has advanced capabilities in machining and drilling composite materials. Stentech can provide a wide range of manufacturing solutions for wave solder pallets that are custom-engineered and manufactured to each client's specifications. The u
New Equipment | ESD Control Supplies
Using silica gel bags is an economic method of protecting moisture damage to products during transport and storage. It is a synthetic substance produced from sodium silicate meaning it has an absorption capacity of 25% (by weight) at a relative humi
Plastlist Polyethylene Foam / PE Foam / IXPE Foam *Prouduct: IXPE foam tape IXPE foam adhesive tape for LED/LCD IXPE foam pad/gaskets for electronics (smartphone) IXPE ESD(Anti-Static,Conductive) tray/bin/box/pallet *Features: Closed Cell
Industry Directory | Manufacturer
A manufacturer of desoldering braid (wick) with an emphasis on continuing advancement in soldering/desoldering technology, visual and x-ray inspection systems, fume extraction, and solder paste inspection systems.
Technical Library | 2018-04-11 22:18:05.0
Millimeter-wave (mmWave) frequency applications are becoming more common. There are applications utilizing PCB technology at 60 GHz, 77 GHz and many other mmWave frequencies. When designing a PCB for mmWave frequency, the properties of the circuit materials need to be considered since they can be critical to the success of the application. Understanding the properties of circuit materials at these frequencies is very important.This paper will give an overview of which circuit material properties are important to mmWave frequency applications using PCBs. There will be data supplied which demonstrates why these properties are essential to the circuit material selection for mmWave applications. Some properties discussed will be dielectric constant (Dk) control, dissipation factor, moisture absorption, thickness control and TCDk (Temperature Coefficient of Dk). Measured comparisons will be shown for insertion loss and Dk versus frequency for different types of circuit materials up to 110 GHz. As part of the test data, the impact on circuit performance due to TCDk and moisture absorption will be shown at mmWave frequencies.
Technical Library | 2012-02-16 16:53:16.0
Channel simulations are only as accurate as the models used to develop them. While we have seen much effort placed on printed circuit board (PCB) materials (copper finish, dielectric moisture absorption), other elements within the channel have been largel
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