74HC05 Hex Inverter with Open-Drain Outputs IC - 14-Pin DIP Package

Every digital logic project eventually needs a NOT gate to flip a signal from High to Low, or Low to High. While the standard 74HC04 is the go-to chip for basic inverting, the 74HC05 offers a highly specific, powerful hardware variation. This 14-pin integrated circuit contains six completely independent inverters, but instead of standard push-pull outputs, it features Open-Drain outputs.

A standard logic chip forcefully pushes a signal High or pulls it Low. The 74HC05, because of its open-drain architecture, can only actively pull a signal Low (acting like a switch connected to Ground). When the chip wants to output a High signal, it simply disconnects, leaving the pin floating. To actually get a High signal, you must physically wire a pull-up resistor from the output pin to your positive voltage supply. This unique trait allows you to physically wire the outputs of multiple 74HC05 gates together onto a single wire without causing a fatal short circuit. If any one of the gates turns ON, it pulls the entire shared line Low.

Key Features & Functional Advantages

• Open-Drain Architecture: Allows multiple gate outputs to be safely tied together on a single physical trace, an impossible feat with standard logic chips.

• Six Independent Gates: Packs a half-dozen separate inverters into a single 14-pin package to manage multiple signal lines at once.

• Current Sinking Capability: Excellent for acting as a series of low-side switches to turn on small indicator LEDs or optocouplers.

• High-Speed CMOS Technology: Combines the ultra-low power consumption of modern CMOS with rapid switching speeds across a 2.0V to 6.0V range.

• Breadboard Native (14-DIP): Sized with standard 0.1-inch spacing to drop effortlessly into solderless breadboards and prototyping boards.

Perfect For

• Wired-AND Logic Circuits: By tying multiple outputs to a single pull-up resistor, you can instantly create a massive AND gate without needing any additional chips.

• Bus Interfacing: The standard hardware method for driving shared data communication lines where multiple devices need to take turns talking.

• Voltage Translation: Can be cleverly used with different pull-up resistor voltages to safely interface a 5V microcontroller with lower-voltage logic families.

• LED Driving: Highly efficient for sinking current to drive small arrays of panel indicator lights.

Technical Specifications

• Logic Family: 74HC High-Speed CMOS

• Logic Function: Hex Inverter

• Output Configuration: Open-Drain

• Number of Gates: 6

• Operating Supply Voltage: 2.0V to 6.0V DC

• Package Case: 14-DIP 0.300 inch width

• Mounting Type: Through-Hole

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