The Limitations of an Integrated Circuit:
1)A single integrated circuit can only work when it is connected to the corresponding peripheral components and is provided power source.
2) There are many transistors but few inductors, resistors and capacitors in integrated circuits, because making those inductors need to use large areas of silicon which result in high cost.
3) Once the integrated circuit is manufactured, the internal circuit couldn’t be changed, unlike the discrete component circuit. Thus, the whole integrated circuit can only be replaced when one of the components in the integrated circuit is damaged.
4) The integrated circuit can't be used alone, which need to be combined with discrete components and form a practical circuit.