74157 – quad 2-to-1 data selector/multiplexer, standard TTL, DIP-16 (generic)

The 74157 is a standard TTL IC with four 2-to-1 data selectors (multiplexers). A common select input chooses between the A and B inputs for all four channels, and a common active-low strobe (enable) input forces all outputs low. The outputs are non-inverting; the inverting version is the 74158. It is used, for example, to choose between two 4-bit data sources and for address multiplexing in older computers with dynamic RAM. It runs from a 5 V supply. It comes in a 16-pin plastic DIP.

Condition: mixed surplus lot, untested. The bag may contain used (pulled) ICs of the same type from different manufacturers, so marking and date code vary. The photo shows one chip from this lot (Signetics 74157N 8025 SA); only the background was cleaned to white, preserving the marking and leads.

Minimum order: 1 pc.

SN74157/SN74LS157 datasheet (Texas Instruments, reference)