thru-hole definition of thru-hole in the Free Online Encyclopedia.

thru-hole

A circuit board packaging technique in which the leads (pins) on discrete components and chips are inserted through holes in the printed circuit board and soldered from beneath. Until the late 1980s and prior to surface mount technology, all devices on circuit boards were thru-hole. Although chips are mostly surface mounted these days, some chips are still thru-hole, and most discrete devices such as resistors and capacitors are thru-hole.

Thru-hole devices have a strong bond with the board but require an extra drilling step. They also eliminate the board real estate underneath from being used for other layers. See surface mount.

Through the Board

In this circuit board from an LED table clock made in 2005, not only the discrete components, but the chip, are thru-hole devices.

Thru-Hole Vs. Surface Mount

The thru-hole chip is not only thicker than the surface mount chip, but it eliminates the real estate underneath because the pins stick through. The board designer must route any traces from other layers around that part of the board.

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No references found	Also, lead found in solders used for machined thru-hole discoidal and planar array ceramic multilayer capacitors, and lead oxide in plasma display panels and surface conduction electron emitter displays used in structural elements (notably in the front and rear glass dielectric layer, the bus electrode, the black stripe, the address electrode, the barrier ribs, the seal frit, the frit ring and in print pastes) will qualify for exempt status. Six RoHS exemptions added by Heffner, Tracy / Printed Circuit Design & Manufacture With the Mill 800, milling from bar employs a 100mm thru-hole to feed bar stock to an indexer for five-sided machining. Bar-fed milling enhancement by Tooling & Production ReelFast SMT spacers/nuts are available in sizes #4-40 through #8-32 and M3 through M4, with thru-hole types in sizes 0. PCB spacers by Designfax	through transmission through valley through weld through-and-through-sawn through-feed centerless grinding through-the-cornice wall dormer through-the-thickness braiding through-wall flashing Throughgoing Action throughput throughstone throughway throw throw-away device throw-in throw-out spiral throwaway throwaway domain throwback throwing Throwing Events throwing power Throwing-Stick throwout THRU thru-hole thrum Thrush thrust thrust augmentation thrust augmenter thrust axis thrust bearing thrust block thrust coefficient Thrust Fault thrust horsepower thrust line thrust load thrust meter thrust moraine thrust nappe thrust output thrust plate thrust power thrust reverser thrust section thrust sheet thrust slice thrust slip fault thrust stage	throws weight about throws weight about throws weight about throws weight about throws weight about throws weight around throws weight around throws weight around throws weight around throws weight around throws weight behind throws weight behind throws weight behind throws weight behind throws weight behind throwster throwsters Throxinique THRP THRR THRS THRSS THRT THRTA thru thru thru Thru Open Short Match Thru the Bible Thru Yonder Window Breaks thru-hole Thru-Open-Match Thru-Plate Girder Thru-Reflect-Line Thru-Short-Delay Thru-Short-Match Thru-Short-Open thrum thrum Thrum cap Thrum hat Thrum-eyed Thrum-eyed thrummed thrummed thrumming thrumming Thrummy thrums thrums Thrumwort Thruout Thrupenny bit thruput thruput thrush thrush thrush thrush Thrush (bird) Thrush (bird)

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Also, lead found in solders used for machined thru-hole discoidal and planar array ceramic multilayer capacitors, and lead oxide in plasma display panels and surface conduction electron emitter displays used in structural elements (notably in the front and rear glass dielectric layer, the bus electrode, the black stripe, the address electrode, the barrier ribs, the seal frit, the frit ring and in print pastes) will qualify for exempt status.

Six RoHS exemptions added by Heffner, Tracy / Printed Circuit Design & Manufacture

With the Mill 800, milling from bar employs a 100mm thru-hole to feed bar stock to an indexer for five-sided machining.

Bar-fed milling enhancement by Tooling & Production

ReelFast SMT spacers/nuts are available in sizes #4-40 through #8-32 and M3 through M4, with thru-hole types in sizes 0.

PCB spacers by Designfax