BETAPIN 1 · Offset trim
Offset nullNULL1
Function
Optional input-offset trim connection.
How to connect
Leave open for the illustrated circuit.
Electrical note
Use the ST offset-adjustment network if trimming is required.
Single JFET-input operational amplifier
TL081 Pinout
Explore TL081 pins, signal names, electrical functions and connection guidance for each package.
Package view
8Physical pins
TL081CNPDIP-8
Manufacturer-referencedSTMicroelectronics
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TL081CNPDIP-8Top view
TL081CDTSOIC-8Top view
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PIN 2 · JFET signal inputs
Inverting inputIN−
Function
Input used by the feedback network.
How to connect
Join the 90 kΩ feedback resistor and 10 kΩ ground resistor.
PIN 3 · JFET signal inputs
Non-inverting inputIN+
Function
JFET signal input.
How to connect
Apply VIN relative to the supply midpoint.
Electrical note
Input bias current increases strongly with temperature.
PIN 4 · Supply
Negative supplyV−
Function
Negative power rail.
How to connect
Connect to −15 V; bypass to signal ground.
PIN 5 · Offset trim
Offset nullNULL2
Function
Second optional trim connection.
How to connect
Leave open in the example.
PIN 6 · Analog output
Analog outputOUT
Function
Output of the internally compensated amplifier.
How to connect
Connect the feedback resistor and a high-impedance meter.
Electrical note
Avoid heavy or capacitive loading without checking stability and output swing.
PIN 7 · Supply
Positive supplyV+
Function
Positive power rail.
How to connect
Connect to +15 V; bypass to signal ground.
PIN 8 · Not connected
No connectionNC
Function
Unused package contact.
How to connect
Leave unconnected.