JPH0115151Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an integrated circuit in which feedthrough capacitors are attached to terminals.

Integrated circuit ICs, which are widely used as electronic components, are equipped with capacitors that act as noise filters to prevent noise from entering the integrated circuit.

Incidentally, in the conventional integrated circuit, the capacitor was incorporated in an external structure in which a capacitor 4 was inserted between the terminal 2 of the integrated circuit 1 and another circuit 3 as shown in FIG. There is a problem in that the area occupied by the capacitor 4 is large, and a large space is required for incorporation into equipment.

Furthermore, if the capacitor 4 is externally attached, there is a drawback that the noise removal effect is poor because the lead inductance or the inductance due to the pattern is large.

This idea was made in order to eliminate the problems and drawbacks mentioned above, and by attaching a feedthrough capacitor that uses this terminal as a feedthrough terminal to the terminal drawn out from the integrated circuit, it is possible to reduce the area within the area of the integrated circuit. It is an object of the present invention to provide an integrated circuit in which a capacitor can be incorporated into a circuit, which requires less space for integration due to miniaturization, and which has an excellent noise removal effect.

Embodiments of this invention will be described below with reference to FIGS. 2 to 11 of the accompanying drawings.

In the first example shown in FIGS. 2 to 5, a feedthrough capacitor 11 is attached to each terminal 2 pulled out downward from both sides of the integrated circuit 1, and each feedthrough capacitor 11 is connected to the feedthrough capacitor 11, and each feedthrough capacitor 11 is grounded. A chassis board 12 or a printed circuit board is commonly attached to the side electrodes.

The feedthrough capacitor 11, as shown in FIG.
Electrodes 14 and 15 are provided on the inner and outer surfaces of a capacitor body 13 formed into a cylindrical shape using ceramic or the like, with terminals 2 passing through the interior and electrodes 15 on the inside.
are connected by solder 16, and the outer ground side electrode 14 is connected to chassis substrate 12 by solder 17, so that noise entering the integrated circuit 1 is released to the ground by each feedthrough capacitor 11.

In FIG. 2, a chassis board 12 is connected to a ground terminal 2a drawn out from an integrated circuit 1 with solder 18,
Although the chassis board 12 is used as a common ground for each feedthrough capacitor 11, a ground terminal may be provided directly on the chassis board 12, or a ground terminal may be connected to each feedthrough capacitor 11.

6 to 8 show the specific structure of the chassis board 12 and the ground terminal 19 provided integrally therewith.
The chassis board 12 has a fitting hole 20 for a feedthrough capacitor 11 formed therein.
In Fig. 6, two ground terminals 19 are connected to each end of the
One ground terminal 19 is provided at the center of the end in FIG. 7 and one at one corner in FIG. 8.

In the examples shown in FIGS. 6 to 8, the terminal 19 is shown as being used as a ground, but it may also be used for mounting on a printed circuit board or an equipment case, or may be used alone.

Next, the examples shown in FIGS. 9 to 11 are cases where the flatpack integrated circuit is applied, and the terminal 2
project in parallel from both sides of the integrated circuit 1, and a feedthrough capacitor 11 with this terminal as a feedthrough terminal is attached to each terminal 2, and the tip of the terminal 2 passing through the feedthrough capacitor 11 is connected to another pattern line.

Each feedthrough capacitor 11 is, as shown in FIG.
For example, it is stacked on a printed circuit board 21 and soldered 22.
The outer electrode 14 is connected to the ground pattern 23 by.

Each feedthrough capacitor 11 on the printed circuit board 21
A recess 24 or a cut-out hole of an appropriate shape into which the feedthrough capacitor 11 fits is provided on the surface where the feedthrough capacitors 11 overlap, so that the feedthrough capacitor 11 can be positioned stably.

As mentioned above, according to this invention, a feed-through capacitor is attached directly to the terminal drawn out from the integrated circuit,
Since the outer electrode of the feed-through terminal is connected to the ground, capacitors for noise removal and circuit time constants can be placed within the area of the integrated circuit, making it smaller than conventional capacitors that use external capacitors. This makes it possible to incorporate it into equipment, making it advantageous in terms of space.

Furthermore, since the feedthrough capacitor is directly attached to the terminal, the influence of lead inductance or pattern inductance is small, and the noise removal effect is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional integrated circuit with a capacitor, Fig. 2 is a front view showing the capacitor of this invention, Fig. 3 is a side view of the same, Fig. 4 is a cross-sectional plan view of the same,
Fig. 5 is an enlarged vertical cross-sectional view of the main part of the above, Figs. 6, 7, and 8 are perspective views showing different examples of chassis shapes, and Fig. 9 is a plan view applied to a flat pack integrated circuit. FIG. 10 is a longitudinal sectional side view of the same, and FIG. 11 is an enlarged plan view of the main parts of the same. DESCRIPTION OF SYMBOLS 1... Integrated circuit, 2... Terminal, 11... Feedthrough capacitor, 12... Chassis board, 13... Capacitor body, 14, 15... Electrode.

Claims (1)

[Scope of utility model registration request] 1. An integrated circuit with a capacitor, characterized in that a feed-through capacitor is attached to a terminal drawn out from the integrated circuit, with the terminal serving as a feed-through terminal, and an outer electrode of the feed-through capacitor is connected to ground.