74ls02 74ahs02 7402 Quad 2-input Nor Gate

The 74LS02 / 74AHS02 / 7402 is a Quad 2-Input NOR Gate IC that offers four independent NOR gates in a single package. Compatible with TTL logic levels, it provides reliable digital performance in control systems, logic operations, and embedded applications.

74ls02 74ahs02 7402 Quad 2-input Nor Gate

The 74LS02 / 74AHS02 / 7402 family represents a group of Quad 2-Input NOR Gate ICs—each containing four independently operated NOR gates built using advanced TTL or AHS (Advanced High-Speed CMOS) technology. These ICs are crucial building blocks in digital electronics where NOR logic is required.

The NOR gate performs the inverse of the OR function. It outputs LOW when any one or more inputs are HIGH, and only gives a HIGH output when all inputs are LOW. This makes it useful for decision-making logic, enabling signals, and creating universal logic circuits.

These ICs are packaged typically in a 14-pin DIP or SOIC format, making them convenient for both through-hole and SMD assembly. The series variants offer compatibility with different voltage levels and speeds:

74LS02 – Low-power Schottky TTL
74AHS02 – Advanced High-Speed CMOS
7402 – Standard TTL variant

🛠 Technical Specifications

Parameter	Specification
Logic Function	NOR Gate (Quad 2-Input)
Number of Gates	4
Input Type	TTL Compatible (LS, AHS, Standard TTL)
Output Type	Push-Pull
Operating Voltage Range	4.75V – 5.25V
Propagation Delay	~10ns (typical, depends on version)
Max Output Current	8 mA (Low), -0.4 mA (High)
Package Types	DIP-14, SOIC-14
Operating Temp Range	0°C to +70°C

💡 Use Cases & Applications

✅ Digital Signal Conditioning – Invert OR logic outputs or generate control signals.
✅ Control Systems & Timers – Build conditional logic for motor control or automation.
✅ Embedded Systems – Interface with microcontrollers for logic-based decision tasks.
✅ Security Systems – Use NOR outputs to trigger alarms when all sensors are inactive.
✅ Logic Circuit Trainers – Ideal for demonstrating universal logic functions in labs.

🛠️ Pair With

🔩 IC’s Category – Explore more logic gates, microcontrollers & support ICs.
🔧 Tools & Accessories – Get your soldering gear and testing tools.
🔋 Power Supply Units – Ensure regulated 5V TTL power supply for proper logic performance.

🎥 YouTube Tutorial

📺 Watch NOR Gate Logic in Action:
Search on YouTube: “74LS02 NOR Gate Circuit Demo”

⚠️ Precautions

Power the IC with regulated 5V DC for stable logic output.
Always tie unused inputs LOW or HIGH to avoid floating logic states.
Use decoupling capacitors (0.1μF) close to VCC for noise suppression.
Don’t exceed maximum input/output current ratings—protect with resistors if needed.
Avoid mixing TTL and CMOS levels without level shifting.

🛒 Summary & Buy Now

Whether you’re building a simple logic gate demo or integrating conditional decision-making in your embedded systems, the 74LS02 / 7402 / 74AHS02 Quad 2-Input NOR Gate is a reliable choice.

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