BETAPIN 1 · Outputs
OutputOUT1
Function
Amplifier A output.
How to connect
Feed back to IN1− through Rf; connect the measured output here.
Electrical note
Allow output headroom; do not treat it as a rail-to-rail output.
Dual operational amplifier
LM358 Pinout
Explore LM358 pins, signal names, electrical functions and connection guidance for each package.
Package view
8Physical pins
LM358PPDIP-8
Manufacturer-referencedTexas Instruments
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LM358PPDIP-8Top view
LM358DSOIC-8Top view
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PIN 2 · Signal inputs
Inverting inputIN1−
Function
Amplifier A feedback input.
How to connect
Connect the junction of Rf and Rg here.
Electrical note
Negative feedback controls the gain while the amplifier is operating linearly.
PIN 3 · Signal inputs
Non-inverting inputIN1+
Function
Amplifier A signal input.
How to connect
Connect the input signal and its common ground.
Electrical note
Keep within the recommended common-mode range.
PIN 4 · Supply
Supply returnV−
Function
Lowest supply potential for both channels.
How to connect
Connect to ground in the illustrated single-supply circuit.
PIN 5 · Signal inputs
Non-inverting inputIN2+
Function
Amplifier B signal input.
How to connect
In this example, connect to VIN so the spare channel acts as a buffer.
PIN 6 · Signal inputs
Inverting inputIN2−
Function
Amplifier B feedback input.
How to connect
Connect directly to OUT2 for a unity-gain follower.
PIN 7 · Outputs
OutputOUT2
Function
Amplifier B output.
How to connect
Connect to IN2−; leave the buffered output otherwise unloaded.
Electrical note
Do not tie the two outputs together.
PIN 8 · Supply
Positive supplyV+
Function
Highest supply potential for both channels.
How to connect
Connect to +5 V and place a 100 nF bypass capacitor to pin 4 nearby.