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# Difference between LM324 Op Amp and Other Similar Models

Author: Irene Date: 20 Feb 2021  4853

## I Introduction

This blog mainly discusses the difference between LM324 and LM324A, and whether they can replace each other in the circuit. Difference between LM324 and other models like LM741, LM358, LM324N, etc. are also discussed in this blog.

Figure 1. LM324

## Catalog

 I Introduction II LM324AD and LM3242.1 Difference2.2 Parameters2.3 Can the Two Replace Each Other? III Difference Between LM324 and LM741, LM358 IV Difference Between LM324 and LM318 V Difference Between LM324 and LM324N VI Difference Between LM324 and LM324J FAQ Ordering & Quantity

LM324 is a four-operational amplifier, which is a large category. It includes two independent, high-gain, internal frequency-compensated operational amplifiers. LM324 is suitable for single power supply with a wide range of power supply voltages, and is also suitable for dual power supply operating mode. Under the recommended operating conditions, the power supply current is independent of the power supply voltage. According to the suffix of LM324, A seed model (specification) is included.

The following will introduce to you the difference between lm324A and lm324, and whether they can be used interchangeably in the circuit.

### 2.1 Difference

The accuracy index of LM324A is slightly higher than that of LM324. Take TI's products as an example:

• Offset Voltage

The input offset voltage of the LM324A is 2mV (typical) to 3mV (maximum);

The input offset voltage of the LM324 is 3mV (typical) to 7mV (maximum).

• Offset Current

The input offset current of the LM324A is 2nA (typical) to 30nA (maximum);

The input offset current of the LM324 is 2nA (typical) to 50nA (maximum).

• Input Bias Current

The input bias current of LM324A is -15nA (typical) ~ -100nA (maximum);

The input bias current of LM324 is -20nA (typical)~-250nA (maximum).

Figure 2. Parameters

### 2.2 Parameters

In fact, whether it is the N series or the A series of the LM324, they belong to the sub-series of the LM324. Only individual parameters such as input offset voltage and input offset current are slightly different, and the other parameters are the same.

 Parameter LM324A LM324 Architecture Bipolar Bipolar CMRR (Typ) (dB) 80 80 Features Standard Amps Standard Amps GBW (Typ) (MHz) 1.2 1.2 Input bias current (Max) (pA) 100000 250000 Iq per channel (Typ) (mA) 0.175 0.175 Number of channels (#) 4 4 Offset drift (Typ) (uV/C) 7 - Operating temperature range (C) 0 to 70 0 to 70 Output current (Typ) (mA) 40 40 Rail-to-rail In to V- In to V- Rating Catalog Catalog Slew rate (Typ) (V/us) 0.5 0.5 Total supply voltage (Max) (+5V=5, +/-5V=10) 32 32 Total supply voltage (Min) (+5V=5, +/-5V=10) 3 3 Vn at 1 kHz (Typ) (nV/rtHz) 35 35 Vos (offset voltage @ 25 C) (Max) (mV) 3 7

### 2.3 Can the Two Replace Each Other?

When discussing whether the two chips can be replaced with each other, we generally refer to the following situations:

• Same Function, Same Package

The two are interchangeable. For example, as far as the commonly used chips LM741, LM324, LM339 are concerned, there are many manufacturers whose chip specifications are more or less the same, the package is the same, and the pin function is also the same.

• Same Function, Different Package

Both can be replaced. However, the size and shape are different, so it can not be installed directly in the original position, such as dual in-line package and four-sided flat package.

• Different Function, Same Package

The two cannot be interchanged. Because, packaging is the product's external specifications. For example, the 74ls373 latch and 74ls374 flip-flop cannot be simply interchanged.

Because the LM324 and LM324AD have the same function, but different packages, they can be replaced. However, this is only limited to the simulation circuit. If it is the actual circuit, due to the different packaging, you originally expected that the soldering position may not reach the size, so you need to replace the circuit.

Figure 3. LM324A

## III Difference Between LM324 and LM741, LM358

These three types of op amps are all general purpose op amps, and their performance indicators are not very high. The specific differences are mainly reflected in the following aspects:

• Number of Channels

LM741: single op amp;

LM358: dual op amp;

• Working Voltage Range

LM741: 7V~36V;

LM358: 3V~32V;

LM324: 3V~32V.

• Unity Gain Bandwidth

LM741: 1MHz

LM358: 700kHz

LM324: 1MHz

• Precision

The input offset voltage of these three types of op amps are:

LM741: 6mV (maximum);

LM358: 7mV;

LM324: 7mV.

• Input Impedance

The LM741 and LM358 are lower, and the input bias current is in the μA level, while the LM324 is 90nA, which is dozens of times higher than the previous two.

Figure 4. LM741

## IV Difference Between LM324 and LM318

The LM324 is a general-purpose op amp (quad op amps). Its slew rate is 0.4V/us and the gain-bandwidth product is 1.3MHz, which is suitable for general use.

LM318 is a high-speed operational amplifier (single op amp), its slew rate is 50V/us, and the gain-bandwidth product is 15MHz. Therefore, LM318 is suitable for amplifying signals with higher frequencies is suitable for amplifying signals with higher frequencies.

Figure 5. LM318

## V Difference Between LM324 and LM324N

LM324 has the same function as LM324N. The difference between the two is that the LM324 does not specify the package form, and the LM324N package is a plastic dual in-line package.

Figure 6. LM324N

P.S.

N suffix refers to the packaging:

• N is DIP
• M is SOIC
• MT is TSSOP
• J is ceramic DIP

## VI Difference Between LM324 and LM324J

LM324J is a DIP package of LM324 produced by NS, which is itself LM324. Another package form of LM324 produced by NS is LM324M, and the package is SO8. Since different manufacturers have different suffix standards, you need to see the datasheet given by the certain manufacturer.

## FAQ

 What is lm324? LM324 is a Quad op-amp IC integrated with four op-amps powered by a common power supply. The differential input voltage range can be equal to that of power supply voltage. ... Generally, op-amps can perform mathematical operations. Which is the difference between lm324 and lm339? The LM324 has a complementary output while the LM339 is open collector. In the complementary output, current can flow in either direction as required (either source or sink) while the open collector output can only sink current. What is op amp use for? Operational amplifiers are linear devices that have all the properties required for nearly ideal DC amplification and are therefore used extensively in signal conditioning, filtering or to perform mathematical operations such as add, subtract, integration and differentiation. How does an op amp work? What is lm324 used for? LM324 IC ApplicationsThe applications of IC LM324 include the following. By using this IC, the conventional op-amp applications can be implemented very simply. This IC can be used as oscillators, rectifiers, amplifiers, comparators etc.

## Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
LM3241TLX-NOPB Company:Texas Instruments Remark:IC REG CONV RF PWR 1OUT 6DSBGA Package:6-WFBGA, DSBGA
DataSheet
In Stock:3000
Inquiry
Price:
 3000+: \$0.31050 6000+: \$0.29900 15000+: \$0.28750 30000+: \$0.28290 75000+: \$0.27600
Inquiry
LM324AD Company:Texas Instruments Remark:General Purpose Amplifier 4 Circuit 14-SOIC Package:14-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
 1+: \$0.43000 10+: \$0.34800 25+: \$0.31840 100+: \$0.21460 250+: \$0.17760 500+: \$0.16280 1000+: \$0.12210 2500+: \$0.11470 5000+: \$0.10730 150+: \$0.10960
Inquiry
LM324AD Company:STMicroelectronics Remark:General Purpose Amplifier 4 Circuit 14-SO Package:14-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
 1+: \$0.43000 10+: \$0.34800 25+: \$0.31840 100+: \$0.21460 250+: \$0.17760 500+: \$0.16280 1000+: \$0.12210 2500+: \$0.11470 5000+: \$0.10730 150+: \$0.10960
Inquiry
LM324AD Company:ON Semiconductor Remark:General Purpose Amplifier 4 Circuit 14-SOIC Package:14-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
 1+: \$0.43000 10+: \$0.34800 25+: \$0.31840 100+: \$0.21460 250+: \$0.17760 500+: \$0.16280 1000+: \$0.12210 2500+: \$0.11470 5000+: \$0.10730 150+: \$0.10960
Inquiry
LM324ADBR Company:Texas Instruments Remark:General Purpose Amplifier 4 Circuit 14-SSOP Package:14-SSOP (0.209"", 5.30mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
 1494+: \$0.16744
Inquiry
LM324ADR Company:Texas Instruments Remark:IC OPAMP GP 4 CIRCUIT 14SOIC Package:14-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:47500
Inquiry
Price:
 2500+: \$0.09610 5000+: \$0.08990 12500+: \$0.08246 25000+: \$0.07936 62500+: \$0.07750
Inquiry
LM324ADR2 Company:ON Semiconductor Remark:General Purpose Amplifier Circuit - 14-SOIC Package:14-SOIC (0.154", 3.90mm Width)
N/A
In Stock:On Order
Inquiry
Price:
 1046+: \$0.24000
Inquiry
LM324ADR2G Company:ON Semiconductor Remark:IC OPAMP GP 4 CIRCUIT 14SOIC Package:14-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:2500
Inquiry
Price:
 2500+: \$0.13082 5000+: \$0.12238 12500+: \$0.11394
Inquiry
LM324ADRG4 Company:Texas Instruments Remark:General Purpose Amplifier 4 Circuit 14-SOIC Package:14-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
 1+: \$0.46000 10+: \$0.39400 25+: \$0.36760 100+: \$0.27300 250+: \$0.23100 500+: \$0.22050 1000+: \$0.16275 2500+: \$0.15225 5000+: \$0.14175 10000+: \$0.13440 25000+: \$0.13125 62500+: \$0.12915 100000+: \$0.12600
Inquiry
LM324ADT Company:STMicroelectronics Remark:General Purpose Amplifier 4 Circuit 14-SO Package:14-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
 1+: \$0.45000 10+: \$0.36200 25+: \$0.33120 100+: \$0.22330 250+: \$0.18480 500+: \$0.16940 1000+: \$0.12705 2500+: \$0.11935 5000+: \$0.11165 12500+: \$0.10241 25000+: \$0.09856 62500+: \$0.09625 125000+: \$0.09240
Inquiry

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