The LM358 is a versatile integrated circuit that contains two independent, high-gain, internally frequency-compensated operational amplifiers. Unlike the LM741, which typically requires a split (dual) power supply, the LM358 is specifically designed to operate from a single power supply across a wide range of voltages. This makes it an ideal choice for modern digital systems, microcontrollers, and battery-powered devices. Its low power consumption and high integration make it one of the most popular op-amps for sensing, signal conditioning, and low-frequency amplification in both consumer and industrial electronics.
LM358 Pinout (DIP-8)
The LM358 provides two op-amps in a single 8-pin package. Each amplifier (A and B) has its own set of inputs and a shared power supply.
| Pin | Terminal | Function |
| 1 | Output 1 | Output of the first op-amp |
| 2 | Inverting Input 1 | Negative input of the first op-amp |
| 3 | Non-Inverting Input 1 | Positive input of the first op-amp |
| 4 | Ground (GND) | Shared negative supply or ground pin |
| 5 | Non-Inverting Input 2 | Positive input of the second op-amp |
| 6 | Inverting Input 2 | Negative input of the second op-amp |
| 7 | Output 2 | Output of the second op-amp |
| 8 | VCC | Shared positive supply voltage |
Technical Specifications
- Supply Voltage (VCC): 3V to 32V (Single) / ±1.5V to ±16V (Dual)
- Input Offset Voltage: 2mV (Typical)
- Voltage Gain: 100 dB
- Bandwidth: 1 MHz
- Low Supply Current: 0.7 mA (Independent of supply voltage)
- Operating Temperature: 0°C to 70°C
- Differential Input Voltage Range: Equal to the supply voltage
Key Features & Benefits
- Single Supply Operation: Eliminates the need for a negative voltage source in simple projects.
- Dual Amplifier Design: Two op-amps in one package save space and reduce cost.
- Low Power Consumption: Minimal current draw makes it perfect for battery-operated gear.
- Wide Common-Mode Range: Can sense signals very close to the ground level.
Common Applications
- Transducer Amplifiers: Amplifying signals from pressure, temperature, or light sensors.
- Voltage Followers: Buffering signals to prevent circuit loading.
- Integrators & Differentiators: Performing mathematical operations on analog signals.
- LED Drivers: Acting as a comparator to turn on indicators at specific thresholds.
LM358 Equivalent & Substitutes
- LM158 / LM258 (Industrial and military grade versions)
- LM2904 (Automotive grade equivalent)
- NE532 (Low noise alternative)
- TL082 (High-speed dual op-amp alternative)
Related Tutorials on ElxHub
- Basics: Learn more in Integrated Circuits – Basics and Working
- Selection Guide: Compare power options in our Ultimate IC Selection Guide
Conclusion
The LM358 is a workhorse in the world of single-supply analog design. Its flexibility, low cost, and dual-channel capability make it a superior choice for modern electronic projects over older single-channel amplifiers. For any designer looking to interface an analog sensor with a digital system, the LM358 is often the most efficient and reliable solution available.
Download the IC’s Datasheet pdf
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