The Ultimate Guide to LM358 Dual Op-Amp vs LM393 Dual Comparator
Update Time: 2023-12-13 14:52:37
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
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.
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.
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
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
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
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.
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
Voltage Comparator Circuits
Driving Relays, Lamps, Motors, and more
Zero Crossing Detectors
Peak Voltage Detectors
High Voltage Protection/Warning Systems
LM358, TL082, LM311 are equivalent to LM393.
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
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.
- Is LM358 the same as LM393?
The LM358 and the LM393 are distinct components. The former is an operational amplifier (OP-Amp) with a push-pull output stage, while the latter is a comparator featuring an open-collector output that requires an additional pull-up resistor. It's crucial to note that these two components are not interchangeable.
- What is the difference between a comparator and an op amp?
In contrast to operational amplifiers, which commonly function with input voltages at similar levels, comparators typically encounter significant differential voltage swings at their inputs. However, it's worth noting that certain comparators lacking rail-to-rail inputs are defined to possess a restricted common-mode input voltage range.
- Can LM358 be used as an audio amplifier?
It's a widely recognized fact that the LM358 op-amp (or its quad counterpart, the LM324, which shares an identical internal circuit) is not suitable for audio applications.
- Can we use LM393 instead of LM358?
No, LM393 and LM358 cannot be interchanged.
- What is the difference between LM393 and LM339?
The LM393 is a dual-channel version available in an 8-pin SOP package, while the LM339 is a quad-channel version available in a 14-pin SOP package.
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