While not just for equivalents, it provides authoritative details on substitutions and common problems for transistors. Towers' International Transistor Selector
: Many transistors from the 1970s and 80s are no longer manufactured. Books like the Philip ECG Semiconductor Master Replacement Guide all transistor equivalent book
Before diving into books, it's worth mentioning that online databases are often more up-to-date and comprehensive for component information, including transistor equivalents. Some notable online resources include: While not just for equivalents, it provides authoritative