The invention relates to a low supply voltage analog multiplier which comprises a pair of differential cells, each cell comprising a pair of bipolar transistors with coupled emitters. The non-single crystalline epitaxial semiconductor layer is removed using a selective etching gas. The external power supply provides a high reverse bias voltage across a diode of the ESD protection circuit. When the additional component is fastened to the substantially parallel area of the interior surface on the fastening portion with mechanical fasteners, the mechanical fasteners do not penetrate the exterior surface.