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Theme of the month - PCB parameters
In July we will concetrate on the parameters of PCBs. We will wrirte about: - their basic parameters, - termic parameters, - moisture absorption, - their electrical paramteres. We will be also interesed in next prodution stage which is the preparing for metallization process. Read on to find out more & like as on FACEBOOK ! ...
What are the dependencies for multilayer PCB thickness values and their tolerances?
The base thickness of laminate for multilayer PCB normally includes the total thickness of the core(s) with base copper foils: external and internal. The maximum allowable tolerance for the final laminate thickness is ±10%. precise PCB final thickness with tolerance results from: prepregs thickness – average ±0.007 mm; core thickness described in tab. 1; process – typically ±0.03 mm. Core thickness [mm] Tolerance [mm] 0.10 ±0.01 0.20 ...
Bridges – structure and parameters
If PCBs are made in panels and scoring cannot be performed, PCBs are held using so called bridges. If the order does not specify their parameters, perforated bridges are normally installed. Keep in mind that the minimum distance of traces, pads, or compound from the perforation hole edges must be at least 10 mils. Select appropriate type in accordance with Fig. 1 or Fig. 2, ensuring that the minimum distance is maintained. Fig. 1. Standard perforated bridge used when no pads or traces are present close to the PCB edge (≥10 mils from the edge). Fig. 2. Standard perforated bridge used w...
Manufacturing printed circuit boards – now and then
Looking through the TS PCB TECHNO-SERVICE S.A. archives, we found a photo of a brushing machine we used in the 80. Photo: brushing machine_archive TS PCB TECHNO-SERVICE S.A. The machine we are currently using enables us to reduce the number of defects and quality issues, as well as to achieve better surface roughness. Equipped with a washer with a high-pressure pump (30 bar), it guarantees residue will be removed from holes. Photo: brushing machine Author: K.Lenczewska ...