The 7426 Quad 2-Input NAND Gate IC is a digital logic integrated circuit that contains four independent 2-input NAND gates with high-voltage open-collector outputs in a single package. As part of the renowned 7400 Series TTL logic family, the 7426 is designed for digital logic operations, signal control, interfacing applications, and industrial electronic systems.
The open-collector outputs allow the IC to interface with higher-voltage circuits through external pull-up resistors, making it suitable for driving relays, lamps, LEDs, and other external loads. The IC is commonly used in digital electronics, automation systems, control circuits, educational projects, and logic-based designs.
The device comes in a standard 14-pin Dual Inline Package (DIP), allowing easy integration into breadboards and printed circuit boards.
Key Features
- Contains Four Independent 2-Input NAND Gates
- High-Voltage Open-Collector Outputs
- TTL Compatible Logic Levels
- High-Speed Digital Operation
- Suitable for External Load Driving
- Standard 14-Pin DIP Package
- Reliable and Stable Performance
- Low Power Consumption
- Easy Breadboard and PCB Integration
- Part of the Popular 7400 Series Logic Family
Technical Specifications
- Product Type: Logic Gate IC
- IC Number: 7426
- Logic Function: Quad 2-Input NAND Gate
- Number of Gates: 4
- Inputs per Gate: 2
- Output Type: High-Voltage Open Collector
- Logic Family: TTL
- Package Type: DIP-14
- Operating Voltage: 4.75V to 5.25V
- Recommended Supply Voltage: 5V
- Output Voltage Capability: Up to 15V (with external pull-up resistor)
- Mounting Type: Through-Hole
- Operating Temperature: 0°C to 70°C (Commercial Grade)
Working Principle
The 7426 IC performs the NAND (NOT-AND) logic function. A NAND gate produces a LOW output only when both inputs are HIGH. For all other input combinations, the output remains HIGH through an external pull-up resistor.
Truth Table
| Input A | Input B | Output Y |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
The high-voltage open-collector outputs provide flexibility for interfacing with circuits operating at voltages higher than the IC supply voltage.
Applications
- Digital Logic Circuits
- Industrial Control Systems
- Logic Interfacing Applications
- Relay and Lamp Drivers
- LED Driver Circuits
- Automation Systems
- Educational Electronics Projects
- Signal Conditioning Circuits
- Microcontroller Interfacing
- Custom Digital Electronics Designs
Advantages
- Four NAND gates in a single package
- High-voltage open-collector outputs
- TTL-compatible operation
- Reliable and robust performance
- Suitable for driving external loads
- Easy integration into digital systems
- Standard DIP package for convenient use
Usage Tips
- Use a regulated 5V supply for IC operation.
- Connect suitable pull-up resistors to the outputs.
- Do not exceed the maximum output voltage rating.
- Use proper decoupling capacitors near the IC.
- Verify logic connections before powering the circuit.
- Suitable for both breadboard prototyping and PCB installations.
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