7402 IC Quad 2-Input NOR Gate DIP-14
The 7402 IC is a Quad 2-Input NOR Gate integrated circuit housed in a DIP-14 package, designed for use in digital logic systems. Each of the four independent NOR gates within the chip performs the logical NOR operation — outputting a high signal only when both inputs are low. Built using TTL (Transistor-Transistor Logic) technology, the 7402 offers fast switching speeds, reliable performance, and compatibility with other TTL and CMOS logic families. It is widely used in digital circuits, logic control units, combinational logic designs, and signal processing applications, making it a fundamental component in educational, industrial, and embedded systems.
Features
- Contains four independent 2-input NOR gates in a single package.
- Operates using standard TTL logic levels.
- High-speed switching performance.
- Low power consumption.
- Wide operating voltage range (typically 4.75V to 5.25V).
- Compatible with other TTL and CMOS logic families.
- Standard 14-pin dual in-line (DIP) package for easy prototyping and PCB mounting.
- Performs the logical NOR operation — output is HIGH only when both inputs are LOW.
- Reliable operation with excellent noise immunity.
- Commonly used in digital logic, control, and signal processing applications.
Pinout Configuration
Specifications
| Product Attribute | Attribute Value |
| Product Category: | Logic Gates |
| Logic Function: | NOR |
| Number of Gates: | 4 Gate |
| Number of Input Lines: | 8 Input |
| Package/Case: | DIP-14 |
| Number of Output Lines: | 4 Output |
| Low Level Output Current: | 5.2 mA |
| High Level Output Current: | – 5.2 mA |
| Propagation Delay Time: | 8 nsec |
| Supply Voltage – Min: | 2 V |
| Supply Voltage – Max: | 6 V |
| Minimum Operating Temperature: | – 40 C |
| Maximum Operating Temperature: | + 85 C |
| Mounting Style: | Through Hole |
| Function: | Quad 2-Input |
| Logic Type: | 2-Input NOR |
| Number of Bits: | 4 bit |
| Operating Supply Current: | 20 µA |
| Operating Supply Voltage: | 5 V |
| Operating Temperature Range: | – 40 C to + 85 C |
| Output Type: | CMOS |
| Product: | Single-Function Gates |
| Product Type: | Logic Gates |
How to use 7402
Like every other chip in the 7400 series, this IC needs to be connected to power before you can use it. Most 7400 ICs support a VCC voltage of 5V. One difference between the HC and LS version of the chip is that the 74HC02 supports 2V to 6V, while the 74LS02 supports only 5V.
Once it’s connected, you can use any of the four basic NOR gates inside.
Each NOR gate here performs NOR operation for two logic inputs. Also, the NOR gate is a combination of OR gate and NOT gate.
So NOR = OR + NOT.
Truth Table of the NOR gate
| Input1 | Input2 | OR Output | NOR Output |
| LOW | LOW | LOW | HIGH |
| HIGH | LOW | HIGH | LOW |
| LOW | HIGH | HIGH | LOW |
| HIGH | HIGH | HIGH | LOW |
For realizing the above truth table let us take a simplified NOR gate and have it connected as shown below.
In the circuit, two transistors are connected to form a NOR gate. The two inputs are driven out from the bases of two transistors. These two inputs are connected to buttons. The output of the gate is taken out from the joint collector of both transistors. This output is connected to an LED through a current-limiting resistor. This LED is connected to detect the state of the output. The buttons are connected to change the logic of inputs.
Applications
- Digital logic circuits and combinational logic design.
- Logic control and decision-making circuits.
- Timing and pulse generation circuits.
- Signal inversion and logic level control.
- Arithmetic and logic unit (ALU) implementations.
- Memory address decoding and data routing systems.
- Microcontroller and microprocessor interface circuits.
- Educational and experimental electronic projects.
- Industrial automation and embedded system designs.
- Logic function generators and waveform shaping circuits.
Package Contents
- 1 x 7402 IC Quad 2-Input NOR Gate DIP-14