The CENTRAL SEMICONDUCTOR BCY78 and BCY79 series types are silicon PNP epitaxial planar transistors, mounted in a hermetically sealed metal case, designed for low noise amplifier and switching applications.
Datasheets by Manufacturer
BCY79 — Siemens Semiconductor Group — PNP SILICON PLANAR TRANSISTORS
BCY78 — Continental Device India — PNP SILICON PLANAR TRANSISTORS