The Ultimate Guide to LM358 Dual Op-Amp vs LM393 Dual Comparator

The LM358 Op-Amp and the LM393 Comparator are two widely used, readily available components known for their ease of use. At first glance, these chips appear quite similar – they share the same package and pinout. However, upon closer examination, fundamental differences emerge between the two. In this article, we will explore the difference between LM358 and LM393, uncover the applications and performance characteristics to make informed choices for your electronic projects.

Overview of LM358 and LM393 ICs

LM358 Overview

The LM358 is a dual operational amplifier integrated circuit featuring two op-amps powered by a single power source. It represents one-half of the LM324 Quad op-amp, which incorporates four op-amps operating from a common power supply. Notably, the differential input voltage range matches the power supply voltage range. Moreover, it boasts an impressively low default input offset voltage of merely 2mV. The standard supply current is 500uA, with a maximum current rating of 700uA, irrespective of the supply voltage range. This operational component maintains a temperature range from 0˚C to 70˚C in ambient conditions, with a maximum junction temperature of 150°C.

LM393 Overview

The LM393 integrated circuit serves as the comparator counterpart to the well-known LM358 Op-Amp. While virtually any Op-Amp can be adapted for use as a voltage comparator, the LM393 offers a specific advantage due to its open collector output, which makes it particularly suitable for load-driving purposes.

The output transistor within this IC is capable of powering loads up to 50V and 50mA, rendering it sufficient for typical TTL, MOS, and RTL loads. Furthermore, the transistor can isolate the load from the system ground. If your requirement involves a Voltage comparator to handle loads with these specifications, this integrated circuit presents itself as a strong candidate.

Specifications Comparison

Specification	LM358	LM393
Supply Voltage	32V, +/-16V	36V, +/-18V
Differential Input Voltage	32V	36V
Input Offset Voltage	3mV max.	5mV max.
Input Bias Current	100nA max.	250nA max.
Input Common Mode Range	0V to V+ - 2V	0V to V+ - 1.5V
Large Signal Voltage Gain	100V/mV typ.	200V/mV typ.
Bandwidth	1MHz	Not specified

Features Comparison

LM358 Dual Op-Amp IC Features

• Outputs Protected Against Short Circuits

• Genuine Differential Input Stage

• Operates on a Single Supply: 3.0 V to 32 V

• Low Input Bias Currents

• Internal Compensation

• Common Mode Range Extends to the Negative Supply

• Compatible with Both Single and Split Supply Operation

• Electrostatic Discharge (ESD) Clamps on the Inputs Enhance Durability Without Impeding Performance

• A Lead-Free Package May be an Option. The G-Suffix Indicates a Lead-Free Lead Finish

LM393 Differential Comparator Features

• Wide Operating Range on a Single Supply: 2.0 Vdc to 36 Vdc

• Split Supply Range: ±1.0 Vdc to ±18 Vdc

• Extremely Low Current Consumption Independent of Supply Voltage: 0.4 mA

• Minimal Input Bias Current: 25 nA

• Low Input Offset Current: 5.0 nA

• Negligible Input Offset Voltage: 5.0 mV (maximum)

• Input Common Mode Range Extends to Ground Level

• Differential Input Voltage Range Equals the Power Supply Voltage

• Output Voltage Compatible with DTL, ECL, TTL, MOS, and CMOS Logic Levels

• Electrostatic Discharge (ESD) Clamps on the Inputs Enhance Device Durability Without Compromising Performance

• Prefix "NCV" for Automotive and Specialized Applications with Unique Site and Control Change Requirements; Complies with AEC−Q100 and PPAP Standards

• These Components are Free of Lead (Pb−Free), Halogens, and BFR (Brominated Flame Retardants), and Adhere to RoHS Regulations

Pinout Comparison

LM358 Pinout

LM393 Pinout

The LM358 and LM393 share the same pinout configurations as the below table.

Pin No.	Pin Name	Description
1	OUTPUT1	The output of Op-Amp 1
2	INPUT1-	Inverting Input of Op-Amp 1
3	INPUT1+	Non-Inverting Input of Op-Amp 1
4	VEE, GND	Ground or Negative Supply Voltage
5	INPUT2+	Non-Inverting Input of Op-Amp 2
6	INPUT2-	Inverting Input of Op-Amp 2
7	OUTPUT2	The output of Op-Amp 2
8	VCC	Positive Supply Voltage

Internal Circuitry Comparison

Initially, when inspecting the internal circuitry of the LM358 and the LM393, a semblance is apparent. However, a closer examination reveals the disparities that account for the distinct specifications outlined earlier.

Both the LM358 and LM393 employ input stages akin to "Darlington-connected" PNPs, which elucidates their ground sensing capabilities. Nevertheless, the differential stages operate at varying currents. Specifically, the LM393 functions at a higher current level to amplify and switch the output swiftly. This characteristic is more critical for the LM393 due to its role as a comparator, whereas the LM358 primarily operates as a linear amplifier, rendering this difference less significant.

The most prominent distinction emerges in the output stages. The LM393 features a notably simpler output stage, designed for rapid switching between voltage rails while minimizing the time spent between them. Additionally, its output stage is of the open-collector type. Conversely, the LM358 boasts a fully linear output stage, in line with its purpose as an operational amplifier, where the output exhibits a linear relationship with the input.

Applications Comparison

LM358 Applications

• Transducer Amplifiers

• Conventional Op-Amp Circuits

• Integrators, Differentiators, Summers, Adders, Voltage Followers, and more

• DC Gain Blocks, Digital Multimeters, and Oscilloscopes

• Comparators for Loop Control and Regulation

LM393 Applications

• Voltage Comparator Circuits

• Driving Relays, Lamps, Motors, and more

• Zero Crossing Detectors

• Peak Voltage Detectors

• High Voltage Protection/Warning Systems

• Oscillator Circuits

Equivalents Comparison

LM358 Equivalents

LM358A, LM358E, LM358-N, LM358W are equivalent to LM58.

LM393 Equivalents

LM358, TL082, LM311 are equivalent to LM393.

Package Comparison

What are the Major Differences Between LM358 and LM393?

LM358	LM393
Dual operational amplifier	Dual comparator
Relatively better input specifications	Relatively worse input specifications
Output linear with input	Non-linear output
Stable with negative feedback	Stable with positive feedback

Datasheet PDF

LM358 Datasheet

LM393 Datasheet

Conclusion

In the world of analog electronics, selecting the right IC can significantly impact the performance of your circuits. The LM358 and LM393, although different in their functions, are both invaluable tools for various applications. By understanding their features and differences, you can make informed decisions for your circuit designs.

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