BETAPIN 1 · Analog outputs
Analog outputOUTA
Function
Amplifier A output.
How to connect
Connect the 30 kΩ feedback resistor and high-impedance output meter.
Electrical note
Output is not rail-to-rail; load and temperature affect the swing.
Quad operational amplifier
LM324 Pinout
Explore LM324 pins, signal names, electrical functions and connection guidance for each package.
Package view
14Physical pins
LM324NPDIP-14
Manufacturer-referencedTexas Instruments
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LM324NPDIP-14Top view
LM324DSOIC-14Top view
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PIN 2 · Amplifier inputs
Inverting inputINA−
Function
Negative feedback input of amplifier A.
How to connect
Connect the 30 kΩ / 10 kΩ feedback junction.
PIN 3 · Amplifier inputs
Non-inverting inputINA+
Function
Positive signal input of amplifier A.
How to connect
Connect to VIN in the example.
Electrical note
Keep the input within the recommended common-mode range.
PIN 4 · Supply
Positive supplyVCC+
Function
Positive supply shared by all four amplifiers.
How to connect
Apply +5 V; bypass locally to pin 11 with 100 nF.
PIN 5 · Amplifier inputs
Non-inverting inputINB+
Function
Positive signal input of amplifier B.
How to connect
Connect to VIN in the example.
Electrical note
Keep the input within the recommended common-mode range.
PIN 6 · Amplifier inputs
Inverting inputINB−
Function
Negative feedback input of amplifier B.
How to connect
Connect directly to OUTB for a unity-gain follower.
PIN 7 · Analog outputs
Analog outputOUTB
Function
Amplifier B output.
How to connect
Join to INB−; leave the follower output otherwise unloaded.
Electrical note
Output is not rail-to-rail; load and temperature affect the swing.
PIN 8 · Analog outputs
Analog outputOUTC
Function
Amplifier C output.
How to connect
Join to INC−; leave the follower output otherwise unloaded.
Electrical note
Output is not rail-to-rail; load and temperature affect the swing.
PIN 9 · Amplifier inputs
Inverting inputINC−
Function
Negative feedback input of amplifier C.
How to connect
Connect directly to OUTC for a unity-gain follower.
PIN 10 · Amplifier inputs
Non-inverting inputINC+
Function
Positive signal input of amplifier C.
How to connect
Connect to VIN in the example.
Electrical note
Keep the input within the recommended common-mode range.
PIN 11 · Supply
Negative supply / returnVCC−
Function
Negative supply shared by all four amplifiers.
How to connect
Connect to GND for the illustrated single-supply circuit.
Electrical note
With split supplies this is the negative rail, not the midpoint.
PIN 12 · Amplifier inputs
Non-inverting inputIND+
Function
Positive signal input of amplifier D.
How to connect
Connect to VIN in the example.
Electrical note
Keep the input within the recommended common-mode range.
PIN 13 · Amplifier inputs
Inverting inputIND−
Function
Negative feedback input of amplifier D.
How to connect
Connect directly to OUTD for a unity-gain follower.
PIN 14 · Analog outputs
Analog outputOUTD
Function
Amplifier D output.
How to connect
Join to IND−; leave the follower output otherwise unloaded.
Electrical note
Output is not rail-to-rail; load and temperature affect the swing.