CD4504 Hex Voltage Level Shifter IC

Mixing 3.3V and 5V logic devices in the same project risks damaging the lower-voltage chip if a 5V signal is fed directly into it, and the CD4504 exists specifically to solve that mismatch - six independent channels each shift a signal from one logic level (VCC) up or down to another (VDD), supporting both TTL-to-CMOS and CMOS-to-CMOS translation across a wide 5V/10V/15V rating range. Having six channels on one DIP-16 chip means a single IC handles an entire multi-signal bus rather than needing a separate shifter per wire.

A fast 2.9ns propagation delay and 50MHz maximum operating frequency mean it doesn't meaningfully slow down signals even in relatively fast digital designs, and its symmetrical output design gives consistent behavior regardless of which direction voltage is being shifted. Extremely low supply current (0.001mA typical) makes it essentially free in terms of power budget for battery-powered projects.

Common uses are interfacing 3.3V microcontrollers (ESP32, STM32) with 5V-only peripherals or sensors, mixed-voltage-domain digital logic designs generally, and any project needing to safely bridge multiple digital signals between two different logic voltage levels.