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PCB Technology
Glossary and Abbreviations - PCB Glossary
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ABCDEFGHIJKLMNOPQRSTUVWXYZAlphabet T
- TABTape Automated Bonding
- Tab Routing (with & without perforation holes)Rather that completing the route path around the board edge, “Tabs” are left so as to leave boards attached in pallets for ease in assembly. And it also provides good mechanical strength to the board.
- Temperature Coefficient (TC)The ratio of a quantity change of an electrical parameter, such as resistance or capacitance, of an electronic component to the original value when temperature changes, expressed in %/ºC or ppm/ºC.
- Tented ViaA via with dry film solder mask completely covering both its pad and its plated-thru hole. This completely insulates the via from foreign objects, thus protecting against accidental shorts, but it also renders the via unusable as a test point. Sometimes vias are tented on the topside of the board and left uncovered on the bottom side to permit probing from that side only with a text fixture.
- TentingThe covering of holes in a printed board and the surrounding conductive pattern with a dry film resist.
- TerminalA point of connection for two or more conductors in an electrical circuit; one of the conductors is usually an electrical contact or lead of a component.
- Test BoardA printed board that is deemed to be suitable for determining the acceptability of a group of boards that were. Or will be, produced with the same fabrication process.
- Test FixtureA device that interfaces between test equipment and the unit under test.
- Test PointA specific point in a circuit board used for specific testing for functional adjustment or quality test in the circuit-based device.
- TestingA method for determining whether sub-assemblies, assemblies and/or a finished product conform to a set of parameter and functional specifications. Test types include: in-circuit, functional, systemlevel, reliability, environmental.
- Test CouponA portion of a printed board or of a panel containing printed coupons used to determine the acceptability of such a board.
- TG (Tg)Glass transition temperature. The point at which rising temperatures cause resin inside the solid base laminate to start to exhibit soft, plastic-like symptoms. This is expressed in degrees Celsius (°C).
- ThiefAn extra cathode placed as to divert to itself some of the current from portions of the board which otherwise would receive too high a current density.
- Through-HoleHaving pins designed to be inserted into holes and soldered to pads on a printed board. Also spelled "thru-hole".
- ToolingThe processes and/or costs of setting up to manufacture a run of pcbs for the first time.
- Tooling HolesThe general term for holes placed on a PCB or a panel of PCBs for registration and hold-down purposes during the manufacturing process.
- Trace/TrackSegment of a conductor route or net.
- TravelerThe list of instructions describing the board, including any specific processing requirements. Also called a shop traveler, routing sheet, job order, or production order.
- TurnkeyA type of outsourcing method that turns over to the subcontractor all aspects of manufacturing including material acquisition, assembly and testing. Its opposite is consignment, where the outsourcing company provides all materials required for the products and the subcontractor provides only assembly equipment and labour.
- TwistA laminate defect in which deviation from planarity results in a twisted arc.
PCB Design Tips
When designing a PCB, try to limit the amount of draws you use. Draws use a lot of memory and slow the programming time. Use a flash for pads instead.
More tips...
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