The SN74HCT04DR is an integrated circuit made by Texas Instruments. It contains four independent 2-input inverters in a single 14-pin 150mil Small-Outline Integrated Circuit (SOIC) package. The circuitry of the device is designed using advanced high-speed CMOS logic circuits, providing greater noise immunity and improved switching speeds. This device is Renowned Onboard High-speed logic (ROH), making it fully compliant with the RoHS directive for lead-free components. Each of the four inverters has a Schmitt trigger action on the input with hysteresis and noise immunity, allowing direct interfacing with optocouplers, buttons, and other CMOS/TTL compatible digital logic interface applications. The CMOS technology offers high noise immunity and low power consumption.