N7406A

Signetics or alternative factory design variant of the standard TTL hex inverter logic integrated circuit with high-voltage open-collector outputs, packaged in a 14-pin plastic DIP. Equivalents: 7406N, SN7406N, DM7406N, HD7406P. Real-Life Examples: Teletype line communication adapters, retro 8-bit storage interface drives, and specialized instrumentation panel indicators.