In the field of DIY electronics and integrated systems, there are few integrated circuits that quietly support some of the most important functions. One of these is the LM358, a dual amplifier that achieves the perfect balance between simplicity, performance, and value. It is widely used in signal processing, sensor interfaces, and analog circuit design. In this article, we will take a detailed look at how the LM358 works, what it is used for, and how to get one.
What is the LM358?
The LM358 is an integrated circuit for a dual arithmetic multiplier that contains two independent high-gain amplifiers. These amplifiers can be powered from a single source and are suitable for amplifying analog signals and comparing voltages.
Key features of the LM358:
- Dual arithmetic multiplier integrated in a single chip
- Supports single or dual power supply
- Low power consumption
- Wide voltage range (3 V to 32 V or ±1.5 V to ±16 V)
- Internal frequency compensation
- Compatible with standard operational amplifier configurations
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LM358 Pinout Overview
| Pin | Name | Description |
|---|---|---|
| 1 | OUT1 | Output of op-amp 1 |
| 2 | IN-1 | Inverting input of op-amp 1 |
| 3 | IN+1 | Non-inverting input of op-amp 1 |
| 4 | Vcc | Positive supply voltage |
| 5 | IN+2 | Non-inverting input of op-amp 2 |
| 6 | IN-2 | Inverting input of op-amp 2 |
| 7 | OUT2 | Output of op-amp 2 |
| 8 | GND | Ground |
Why the LM358 is suitable for DIY projects
- Single-phase power supply
Many operational amplifiers require dual power supplies. The LM358 can operate with a single power supply up to 3 V, making it ideal for microcontroller-based systems such as Arduino or ESP32.
- Low cost and high availability
The LM358 chip is available almost everywhere, from online stores to electronic kits. Its low price and reliability make it popular among the maker community.
- Good compatibility with sensors
The LM358 is often used in analog signal processing circuits such as temperature and humidity sensors and light sensors. It can amplify weak signals to levels suitable for ADC converters.
- Can be used as a comparator
Although not designed for comparison, the LM358 can perform basic voltage comparison tasks, giving it flexibility in threshold detection applications.
Common applications of the LM358
| Application | Function |
|---|---|
| Signal Amplification | Amplify analog sensor outputs |
| Voltage Follower | Prevents signal loading |
| Active Filters | Low-pass, high-pass, band-pass filters |
| Comparator | Voltage level detection |
| Pulse Width Modulation | Signal control in LED or motor drivers |
| Audio Pre-Amplifiers | Basic analog audio processing |
LM358 Circuit Examples
The basic configuration of a non-inverting amplifier is shown below:
This circuit amplifies the input voltage according to the resistance value:
Gain = 1 + (R2 / R1)
💡 Need help selecting a resistor value? Visit our component calculation tools or contact us directly.
Replacements for LM358
If you need higher accuracy or speed, consider the following replacements:
- TL072 – low-noise dual JFET operational amplifier
- OPA2134 – high-performance audio operational amplifier
- LM324 – four-channel version of the LM358 operational amplifier
See the complete range of operational amplifiers from DRex Electronics.
Where to buy LM358 and related components
You can purchase LM358 from DRex Electronics, along with analog integrated circuits, amplifiers, and passive components. We offer:
- Worldwide shipping
- Reliable suppliers such as STMicroelectronics, ON Semiconductor, and Texas Instruments
- Quality assurance and ISO 9001 certification
Summary
LM358 is a small but powerful integrated circuit. It provides power for many DIY projects, commercial devices, and integrated systems. Its low cost, flexibility, and ease of use make it a popular operational amplifier for beginners and professionals alike.
If you want to improve your circuit design or need a reliable analog operational amplifier, the LM358 is a reliable choice. Ready to try it out? Discover our range of operational amplifiers today.
