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(c) Excessive plating on PTH bartions equipment where the use of Sn-Pb solder rel walls and annular pads (d) Excess plating on is currently exempt from RoHS Pb-free annular ring causing pin interference and premature EON pin collapse (e) An overly compressed pin requirements excess PTH Excessive plating on PTH barrel walls and resulting from poses a plating onrisk annular ring This condition reliability annular pads (see Fig 496c, d) can cause premature collapse of the compliant section of the press-fit pin This condition may result in excessive pressing force to get the pin into the hole as well as insufficient normal contact force from the collapsed press-fit pin section to the barrel once fully seated in the hole This condition poses an electrical contact reliability risk, as shown in Fig 496e, where the pin is not actually in contact with the PTH barrel walls Figure 49.

Dot matrix displays are the best in terms of the type of information that can be displayed, including graphics. Dot matrix displays are necessarily multiplexed displays. Figure 6.33 illustrates an interface circuit for a 5-by-7 dot matrix display. Figure 6.34 is a circuit diagram for a AT90S2313 controlled dot matrix display. The display is arranged as five columns of seven LEDs each. Each column is refreshed at a rate of 40 Hz at 4.00-MHz

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7a shows a precollapsed press-fit pin that is making only intermittent contact due to the FIGURE 497 (a) Excess nickel plate on a PWB condition as depicted in Fig 497b PTH annular ring has caused two problems High-aspect-ratio holes (PWB thickness: PTH First, it has shaved material from the press-fit diameter) may have irregular plating where the thick- pin (arrows labeled x )Additionally, it caused ness closest to the board s outer layers is within compression of the compliant section of the acceptable thickness limits, whereas plating thickness pin When fully seated in the PTH, the pin was in the middle of the PTH may have unusually thin too loose for reliable contact The y labels deposits These thin deposits are caused by plating demark a gap between the press-fit pin and the PTH wall.

In the application of hybrid fluid bearings, plain bearings with slots or orifices as in aerostatic journal bearings are often preferred to recessed bearings because of the higher load capacity at an elevated speed The recess arrangement is not suitable as it impairs the hydrodynamic performance The circumferential slots or orifices can be arranged either in a single row (half station feeding in aerostatic journal bearing) or in two rows (Figure 664) Hybrid bearings are well suited for heavily loaded conditions at high speeds, and they have the advantages of both hydrodynamic and hydrostatic bearings and eliminate some of the disadvantages Hybrid bearings avoid hydrodynamic bearing wear when starting and stopping Furthermore, hybrid bearings can be designed at a smaller shaft diameter size which helps reduce the cost associated with the material and operation

Compare this to (b), where pin shavbath stagnation and exhaustion a zone of poor elec- ing is evident but the pin is in intimate contact trolyte circulation within the high-aspect-ratio barrel with the PTH barrel (Scanning electron microThis condition may also lead to poor contact of the scope (SEM) micrographs courtesy of A press-fit pin against the PTH barrel wall and contact Alexander, Jabil Circuits, Penang, Malaysia) reliability issues The opposite can be detrimental also, where the PWB vendor strives to attain the proper plating thickness within the PTH barrel, but plates too much material at the barrel openings and on annular rings 4963 Slivers The Pb of Sn-Pb solder-coated barrels is known to reduce the force required for pressfit connector insertion and seating.

Although Sn-Pb coating is one of the best surface finishes for pressing, if it is thick, then the pressfit connector pin may skive a thin sliver of solder and push it out the secondary side of the PWB (see Fig 498) Very often these slivers.

remain attached to the pin or the PWB, or they become jammed between the pin and barrel. The sliver may break free of its source and cause an electrical short locally or elsewhere in the system.

Several types of mechanical presses are used for applying press-fit connectors to PWBs. The lever-activated arbor press is the most primitive but suffices for simple, low-lead-count, coarsepitch connectors. One step up is the pneumatically driven press. Although it is easier to operate than the lever-activated arbor press, it does little for process control or assembly repeatability. Higher on the evolutionary scale is the pneumatic/hydraulic combination (the so-called airover-oil press), which offers a somewhat more controllable process. High-precision pressing cycles are mandated by the latest press-pin connectors with their delicate, molded body features, fragile electrical shielding, and fine pin pitch, so it is advisable to use a machine that is computercontrolled.Aside from force and speed precision for process reproducibility, press cycle data can be stored along with process recipes for ram force, speed of compression, and component location if equipped with programmable axes. Data logging is critical for statistical process control and is useful for press cycle root-cause defect analysis or machine troubleshooting. The state-of-the-art connector press is electromechanically actuated, relying on a motordriven coarse-pitch lead screw with tachometer speed control, z-axis positional encoders, and load cell feedback for an accurate pressing cycle (see Fig. 49.9).

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