LM358N Dual Operational Amplifier

Overview

The LM358N is a dual operational amplifier that features high gain, internal frequency compensation, and a wide operating voltage range. Designed for single-supply operation, it can also operate from split power supplies while maintaining low power consumption. This makes it suitable for a variety of applications, from industrial controls to consumer electronics.

The device is part of the LM158 series, which includes two independent op-amps in a single package. The LM358N is characterized by its low input offset voltage and low input bias current, making it ideal for precision applications.

Features

• Dual Operational Amplifiers: Contains two independent op-amps in a single package.
• Wide Supply Voltage Range: Operates from a single power supply of 3V to 32V or dual supplies of ±1.5V to ±16V.
• Low Power Consumption: Quiescent current is typically 0.7mA per amplifier, independent of supply voltage.
• Internal Frequency Compensation: Eliminates the need for external components for stability.
• Low Input Offset Voltage: Typically 2mV, ensuring high accuracy in signal processing.
• Low Input Bias Current: Typically 20nA, minimizing errors in high-impedance circuits.
• Available in Multiple Packages: Includes 8-pin DIP, SOIC, and micro SMD chip-sized packages.
• High Gain Bandwidth Product: 1MHz typical, suitable for a wide range of applications.

Applications

The LM358N is versatile and can be used in a variety of electronic circuits, including:

• Signal Conditioning: Used in filtering, amplification, and buffering of analog signals.
• Sensor Interfaces: Ideal for amplifying signals from sensors such as thermocouples, strain gauges, and photodiodes.
• Power Supply Control: Employed in voltage regulators and power management circuits.
• Audio Applications: Used in preamplifiers, tone control circuits, and active filters.
• Industrial Controls: Suitable for process control, motor control, and instrumentation systems.
• Consumer Electronics: Found in devices like battery chargers, LED drivers, and portable electronics.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LM358N under typical operating conditions (V_CC = +5V, T_A = 25°C unless otherwise noted).

DC Characteristics

• Input Offset Voltage: 2mV (max 7mV)
• Input Bias Current: 20nA (max 150nA)
• Input Offset Current: 2nA (max 30nA)
• Common Mode Rejection Ratio (CMRR): 70dB (min 65dB)
• Supply Voltage Rejection Ratio (PSRR): 100dB (min 80dB)
• Large Signal Voltage Gain: 100V/mV (min 25V/mV)

AC Characteristics

• Gain Bandwidth Product: 1MHz (typical)
• Slew Rate: 0.6V/µs (typical)
• Input Noise Voltage: 40nV/√Hz (typical at 1kHz)

Power Supply Characteristics

• Supply Voltage Range: 3V to 32V (single supply), ±1.5V to ±16V (dual supply)
• Quiescent Current: 0.7mA per amplifier (typical)

Package Information

The LM358N is available in several package options, including through-hole and surface-mount configurations. Below are the details for the most common packages:

8-Pin DIP (Dual Inline Package)

• Package Code: N (DIP-8)
• Dimensions: 9.81mm x 6.35mm x 3.3mm
• Pin Count: 8
• Operating Temperature Range: 0°C to +70°C

8-Pin SOIC (Small Outline Integrated Circuit)

• Package Code: D (SOIC-8)
• Dimensions: 4.9mm x 3.9mm x 1.25mm
• Pin Count: 8
• Operating Temperature Range: -40°C to +85°C

8-Bump micro SMD (Chip-Sized Package)

• Package Code: See AN-1112 for details
• Dimensions: Ultra-compact, suitable for space-constrained applications
• Pin Count: 8
• Operating Temperature Range: -40°C to +125°C

Conclusion

The LM358N is a highly reliable and versatile dual operational amplifier, offering excellent performance for a wide range of applications. Its combination of low power consumption, wide supply voltage range, and robust electrical characteristics make it a preferred choice for designers in both industrial and consumer electronics. With multiple package options, it can be easily integrated into various circuit designs, from prototyping to mass production.