Navy Electricity and Electronics Training Series - Historic Naval ...

Figure 1-19.—Exploded TO-5.Figure 1-20.—TO-5 package.The modified TO-5 package (figure 1-21) can be either plugged into [view (A)] or embedded in[view (B)] a board. The embedding method is preferred. Whether the package is plugged in or embedded,the interconnection area of the package leads must have sufficient clearance on both sides of the board.The plug-in method does not provide sufficient clearance between pads to route additional circuitry.When the packages are embedded, sufficient space exists between the pads [because of the increaseddiameter of the interconnection pattern, shown at the right in view (B)] for additional conductors.1-20