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LM324 Quad OP-AMP IC

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Pin Configuration

Pin Number

Pin Name

Description

1

OUTPUT1

Output of Op-Amp 1

2

INPUT1-

Inverting Input of Op-Amp 1

3

INPUT1+

Non-Inverting Input of Op-Amp 1

4

VCC

Positive Supply Voltage

5

INPUT2+

Non-Inverting Input of Op-Amp 2

6

INPUT2-

Inverting Input of Op-Amp 2

7

OUTPUT2

Output of Op-Amp 2

8

OUTPUT3

Output of Op-Amp 3

9

INPUT3-

Inverting Input of Op-Amp 3

10

INPUT3+

Non-Inverting Input of Op-Amp 3

11

VEE,GND

Ground or Negative Supply Voltage

12

INPUT4+

Non-Inverting Input of Op-Amp 4

13

INPUT4-

Inverting Input of Op-Amp 4

14

OUTPUT4

Output of Op-Amp 4

 

LM324 Quad Op-Amp IC features and specifications

  • Integrated with four Op-Amps in a single package
  • Wide power supply Range
  1. Singe supply – 3V to 32V
  2. Dual supply – ±1.5V to ±16V
  • Low Supply current – 700uA
  • Single supply for four op-amp operation enables reliable operation
  • Operating ambient temperature – 0˚C to 70˚C
  • Soldering pin temperature – 260 ˚C (for 10 seconds – prescribed)

 

LM324 Equivalent Quad Op-Amp ICs

LM3900, LMC660, LM339, LT014, LM2900, LM324A, LM324E, LM324-N, LM324W

 

Brief Description

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. The default input offset voltage is very low which is of magnitude 2mV. The operating temperature ranges from 0˚C to 70˚C at ambient whereas the maximum junction temperature can be upto 150˚C. Generally, op-amps can perform mathematical operations.

 

LM324 Explanation with example

Consider, an motor running with a variable load. As the load increases the current increases which in turn increases the temperature of the motor. So, our job is to shut down the system if the temperature increases beyond rated. This is the place where op amp operates as a positive comparator. Here a thermistor does the job whose resistance varies with temperature.

Below will be a simple circuit connection to sense temperature and control a system.

 Sense temperature and control a system working using LM324

At Temperature = 25˚C, RT=10kὨ. Inv Input=1.32V and Non-Inv Input=2.36V.

Thus, Output is HIGH and it can drive a motor ON through a transistor or relay.

 Sense temperature and control a system in action using LM324

At Temperature = above 70˚C, RT=3kὨ. Inv Input=1.32V and Non-Inv Input=1.06V.

Thus, Output is LOW and it can drive a motor OFF through a transistor or relay.

 Sense temperature and control a system using LM324

 

If the temperature is to be monitored at three or four positions of the motor then LM324 can be used in below configuration. An orientation example for two temperature sensing RT1 and RT2,

 Sense temperature and control a system using LM324 IC

 

Supply connection:

LM324 Single Supply Connection

Single Supply Connection

 

LM324 Dual Supply Connection

Dual Supply Connection

Above is the supply configuration for both single and dual supply connections.

 

Applications:

  • Transducer Amplifiers
  • Filter circuits, Voltage followers
  • Integrator, Differentiator, Summer, adder, Voltage follower, etc.,
  • DC gain blocks
  • Comparators (Loop control & regulation)

 

2D-model

LM324 Quad Op-amp IC 2D Model

LM324 IC Dimensions

 


Download Datasheet PDF:
LM324 Quad Op-amp IC Datasheet
Tags Op amp