LM358 Dual Operational Amplifier

Overview

LM358 Dual Operational Amplifier (Op-Amp) IC featuring two independent high-gain internally frequency-compensated operational amplifiers designed for single-supply operation. A widely used analog IC suitable for signal amplification, sensor conditioning, voltage comparison, active filters, oscillators, audio preamplifiers, and embedded electronic circuits.

The LM358 operates from a single power supply as low as 3V and supports dual-supply operation, making it ideal for battery-powered devices, Arduino projects, industrial electronics, IoT systems, robotics, and analog signal processing applications.

Specifications

Parameter	Value
Model	LM358
Type	Dual Operational Amplifier
Number of Amplifiers	2
Supply Voltage	3V – 32V (single supply)
Dual Supply Voltage	±1.5V – ±16V
Input Offset Voltage	2mV typical
Gain Bandwidth Product	1MHz
Slew Rate	0.3V/µs
Input Bias Current	20nA
Output Current	20mA
Power Consumption	Low
Package	DIP-8 / SOP-8
Operating Temperature	0°C to +70°C

Pin Configuration

Pin	Description
1	Output 1
2	Inverting Input 1 (-)
3	Non-Inverting Input 1 (+)
4	GND / V-
5	Non-Inverting Input 2 (+)
6	Inverting Input 2 (-)
7	Output 2
8	VCC / V+

Features

• Dual op-amp design — two amplifiers in one IC
• Single supply operation — works from 3V to 32V
• Low power consumption — suitable for battery-powered circuits
• Ground-sensing input — input can operate near ground
• Wide voltage range — flexible analog design support
• Internally frequency compensated — stable operation
• Easy to use — beginner-friendly analog IC
• Low cost — extremely popular and affordable
• Wide availability — commonly used in electronics projects
• Compatible with Arduino & ESP32 systems

Common Applications

• Sensor signal amplification
• Comparator circuits
• Audio preamplifier
• Voltage follower / buffer
• Active low-pass filters
• Oscillator circuits
• Battery voltage monitoring
• Current sensing circuits
• Light sensor amplification
• Temperature sensing systems

LM358 vs LM324

Feature	LM358	LM324
Amplifiers	2	4
Package	DIP-8	DIP-14
Supply Voltage	3V – 32V	3V – 32V
Power Consumption	Low	Low
Gain Bandwidth	1MHz	1MHz
Slew Rate	0.3V/µs	0.5V/µs
Best For	Compact circuits	Multi-channel analog systems

Basic Voltage Comparator Circuit

Example Wiring

Component	Connection
VCC	5V
GND	GND
Sensor Input	Pin 3
Reference Voltage	Pin 2
Output	Pin 1

Applications in Embedded Systems

The LM358 is commonly used with:

• Arduino UNO
• ESP32
• STM32
• Raspberry Pi ADC circuits
• Sensor modules
• Robotics systems
• Industrial control circuits

Package Includes

• 1× LM358 Dual Op-Amp IC

Notes

• Output cannot fully reach VCC
• Suitable for low-frequency analog applications
• Not designed for high-speed signal processing
• Use proper decoupling capacitors near power pins
• DIP package is ideal for breadboard prototyping