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Sep 24 2020

LM324 Op Amp: A Basic Overview

I. Description

LM324 is a operational amplifier (OP-AMP) that require a battery or single-polarity supply. Compared to the standard operational amplifier type, it has several obvious advantages in single-supply applications. This quad-operational amplifier is suitable for single power supply with a wide range of power supply voltage and dual power supply mode. Under the recommended working conditions, the power supply and current are independent of the supply voltage. Its scope of use includes sensor amplifiers, DC gain modules and all other applications where operational amplifiers can be powered by a single power supply.

This Vedio Introduces 5 Simple LM324 DIY Electronic Projects


I. Description


II. Documents and Media


III. LM324 Pin Configuration and Functions


IV. Basic Parameters

V. Features

VI. Applications


VII. Where and How to Use LM324?


VIII. Functional Block Diagram




X. Product Manufacturer


XI. Product Range


XII. Alternative Models




II. Documents and Media

Component Datasheet

 LM124/224/324/2902-N Datasheet

Featured Product

LM324 324A Quadruple Operational Amplifiers

III. LM324 Pin Configuration and Functions

LM324 op amp has 14 pins as CDIP, PDIP, SOIC and TSSOP. The data sheet provided above is for your reference, so that you can understand the physical dimensions of all packages in more detail. The configuration of all 14 pins and the function of each pin are as follows:


The function of all 14 pins of LM324 op amp are as follows:



  • 1 Out 1 - Output 1

Obtain output of 1st OP-AMP

  • 2 Input 1 - inverting Input

Apply inverting input voltage to 1stOP-AMP

  • 3 Input 1- non-Inverting Input

Apply non-inverting input voltage to 1st OP-AMP

  • 4 Vcc

Connect supply voltage.

  • 5 Input 2 - non-Inverting Input

Apply non-inverting input voltage to 2nd OP-AMP

  • 6 Input 2 -inverting Input

Apply inverting input voltage to 2ndOP-AMP

  • 7 Out 2 - Output 2

Obtain output of 2nd OP-AMP

  • 8 Out 3 - Output 3

Obtain output of 3rd OP-AMP

  • 9  Input 3 - inverting Input

Apply inverting input voltage to 3rdOP-AMP

  • 10 Input 3 - non-Inverting Input

Apply non-inverting input voltage to 3rd OP-AMP

  • 11 Vee, GND

Connect ground for single voltage operation or the second as Vee for dual power supply operation

  • 12 Input 4 - non-Inverting Input

Apply non-inverting input voltage to 4th OP-AMP

  • 13  Input 4 - inverting Input

Apply inverting input voltage to 4thOP-AMP

  • 14 Out 4- Output 4

Obtain an output of 4th OP-AMP

IV. Basic Parameters

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

V. Features

  • Wide supply ranges
  • Single supply: 3 V to 32 V
  • Dual supplies: ±1.5 V to ±16 V
  • Low supply-current drain independent of supply voltage: 0.8 mA typical
  • Common-mode input voltage range includes ground, allowing direct sensing near ground
  • Differential input voltage range equal to maximum-rated supply voltage: 32 V
  • 2 kV ESD protection
  • Low input bias and offset parameters
  • Input offset voltage: 3 mV typical
  • A versions: 2 mV typical
  • Input offset current: 2 nA typical
  • Input bias current: 20 nA typical
  • A versions: 15 nA typical
  • Open-loop differential voltage amplification: 100 V/mV typical
  • Internal frequency compensation

VI. Applications

  • Transducer amplifiers
  • DC amplification blocks
  • All the conventional operational-amplifier circuits that now can be more easily implemented in single-supply-voltage systems.

VII. Where and How to Use LM324?

LM324  can be operated by a single power source. Two power supplies can also be used. The terminals or the pins used are pin ④ and ⑪. This single supply or two power supplies will make all four OP-AMPs operative.

For 1st OP-AMP, inverting input is applied at pin ② and non-inverting at pin ③. The output of the first OP-AMP is obtained at pin ①.

For 2nd OP-AMP, inverting input is applied at pin ⑥ and non-inverting at pin ⑤. The output of second OP-AMP is obtained at pin ⑦.

For 3rd OP-AMP, inverting input is applied at pin ⑨ and non-inverting at pin ⑩. The output of third OP-AMP is obtained at pin ⑧.

For 4th OP-AMP, inverting input is applied at pin ⑬ and non-inverting at pin ⑫. The output of fourth OP-AMP is obtained at pin ⑭.

VIII. Functional Block Diagram






HTS Code


X. Product Manufacturer

Texas Instruments Inc. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments's focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.

XI. Product Range



Developer Tools




Kinetis Cortex®-M Microcontrollers

In-Vehicle Network


LPC Cortex-M Microcontrollers

Microcontrollers and Processors


XII. Alternative Models

  • AD620
  • LM4871
  • LM709
  • LM201


  • 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 Applications

The 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.


After reading the blog, have you better understand LM324 op amp? If you are also interested in how to use the LM324 IC to simulate and generate function signals, you may wish to browse right here right now!

Finally, if you have any questions about LM324, please do not hesitate to leave a message in the comment section below!

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