LM324 Quad Operational Amplifier

Overview

LM324 Quad Operational Amplifier (Op-Amp) IC featuring four independent high-gain internally frequency-compensated operational amplifiers in a single package. Designed for single-supply operation with low power consumption, the LM324 is widely used in analog electronics, sensor interfacing, signal conditioning, industrial control systems, robotics, audio circuits, and embedded applications.

The IC supports a wide operating voltage range and can directly interface with many sensors and microcontrollers, making it one of the most popular analog ICs in electronics engineering and educational projects.

Specifications

Parameter	Value
Model	LM324
Type	Quad Operational Amplifier
Number of Amplifiers	4
Supply Voltage	3V – 32V
Dual Supply Voltage	±1.5V – ±16V
Gain Bandwidth Product	1MHz
Slew Rate	0.5V/µs
Input Offset Voltage	2mV typical
Input Bias Current	20nA
Output Current	20mA
Package	DIP-14 / SOP-14
Operating Temperature	0°C to +70°C

Pin Configuration

Pin	Description
1	Output 1
2	Inverting Input 1 (-)
3	Non-Inverting Input 1 (+)
4	VCC
5	Non-Inverting Input 2 (+)
6	Inverting Input 2 (-)
7	Output 2
8	Output 3
9	Inverting Input 3 (-)
10	Non-Inverting Input 3 (+)
11	GND / V-
12	Non-Inverting Input 4 (+)
13	Inverting Input 4 (-)
14	Output 4

Features

• Quad op-amp design — four amplifiers in one IC
• Single supply operation — ideal for embedded systems
• Low power consumption — efficient analog processing
• Wide operating voltage range
• Ground-sensing input capability
• Internally frequency compensated
• Compact multi-channel analog solution
• Cost-effective design
• Breadboard friendly DIP package
• Suitable for industrial and educational use

Common Applications

• Multi-channel sensor amplification
• Comparator circuits
• Signal conditioning
• Analog filters
• Voltage monitoring
• Motor control feedback
• Audio signal processing
• Light and sound detection
• Industrial automation
• Robotics electronics

LM324 vs LM358

Feature	LM324	LM358
Amplifiers	4	2
Package	DIP-14	DIP-8
GPIO Space	Larger	Smaller
Power Consumption	Slightly higher	Lower
Analog Channels	More	Fewer
Best For	Multi-sensor systems	Compact projects

Basic Sensor Amplifier Example

Component	Connection
VCC	5V
GND	GND
Sensor Signal	Non-Inverting Input
Reference Voltage	Inverting Input
Output	Output Pin

Applications in Embedded Systems

The LM324 is frequently used in:

• Sensor modules
• Robotics systems
• IoT analog interfaces
• Industrial monitoring
• Smart home electronics
• Motor driver feedback systems
• Battery monitoring circuits

Package Includes

• 1× LM324 Quad Op-Amp IC

Notes

• Output does not fully swing to VCC
• Suitable for low-frequency analog circuits
• Add bypass capacitors for stable operation
• Avoid high-speed precision applications
• DIP package ideal for prototyping and education