• 14 terminals
  • Checked October 2026

Op Amp Diagram

The terminals of an op amp on its triangle symbol, then on the pins of the chip.

Op Amp Diagram

Name Date

Tap any terminal to read, rename or leave it out

1 2 3 4 5 6 7 8 9 10 11 12 13 14
More options

Write the name of each numbered terminal.Answer key

  1. Inverting input
  2. Non-inverting input
  3. Output
  4. Positive supply
  5. Negative supply
  6. Inverting input
  7. Non-inverting input
  8. Output
  9. Positive supply
  10. Negative supply
  11. Offset null
  12. Offset null
  13. No connection
  14. Notch

Drawn for this site on 2026-10-03 from plain geometry. Licence: own work.

Each numbered ring is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a terminal is answered.

Next step Next: the parts of a circuit

All 14 terminals on the diagram

Show the list

The symbol 5

  1. Inverting input The input marked with a minus sign. A rise here drives the output down.
  2. Non-inverting input The input marked with a plus sign. A rise here drives the output up.
  3. Output The amplified signal leaves here. It is the difference between the two inputs, made far larger.
  4. Positive supply The positive side of the power supply connects here.
  5. Negative supply The negative side of the power supply connects here.

The eight-pin package 9

  1. Inverting input The input marked with a minus sign. A rise here drives the output down.
  2. Non-inverting input The input marked with a plus sign. A rise here drives the output up.
  3. Output The amplified signal leaves here. It is the difference between the two inputs, made far larger.
  4. Positive supply The positive side of the power supply connects here.
  5. Negative supply The negative side of the power supply connects here.
  6. Offset null One of two pins for trimming the output to zero. A variable resistor between pins 1 and 5 cancels the small input offset.
  7. Offset null The second pin for trimming the output to zero. It pairs with pin 1.
  8. No connection This pin is joined to nothing inside the chip.
  9. Notch A cut that marks one end of the package. With it at the top, pin 1 is at the upper left and the pins count counterclockwise.

How this list was compiled: Every terminal name and every pin checked on 2026-10-03 in two sources or more: Wikipedia, text only (Operational amplifier; Dual in-line package); a maker's public datasheet of a general-purpose single op amp, https://www.ti.com/lit/ds/symlink/ua741.pdf (its pin table); three electronics textbooks and one digital laboratory book read through archive.org full-text search; Georgia State University, HyperPhysics, http://hyperphysics.phy-astr.gsu.edu/hbase/Electronic/opamp.html and a741p.html. Licence: own work

The drawing: Drawn for this site on 2026-10-03 from plain geometry; nothing traced. Licence: own work

How it works

An operational amplifier, or op amp, makes the difference between two input voltages far larger. Its symbol is a triangle with five terminals. The second view shows the same terminals on the pins of a common chip.

Read the full guide

The symbol

Two inputs enter the flat side of the triangle. The one by the minus sign is the inverting input, and the one by the plus sign is the non-inverting input. The output leaves the point. The positive supply comes in from above and the negative supply from below.

The eight-pin package

Hold the chip with its notch at the top. Pin 1 is at the upper left, and the pins count down the left side and back up the right. The thin lines show which terminal of the symbol each pin reaches.

  • On a circuit diagram the two supply leads are often left off the symbol.
  • Pin 8 of this package has no line because it joins nothing inside.

Questions and answers

What are the five terminals of an op amp?

The inverting input, the non-inverting input, the output, the positive supply and the negative supply. Open Study to see each name on the triangle, then press Quiz me.

What is the difference between the inverting and the non-inverting input?

The op amp amplifies the non-inverting input's voltage minus the inverting input's. A rise at the non-inverting input, marked plus, sends the output up. The same rise at the inverting input, marked minus, sends it down.

How are the pins of an eight-pin op amp numbered?

With the notch at the top, pin 1 is at the upper left. The numbers run down the left side to pin 4, then up the right side from pin 5 to pin 8, counterclockwise as seen from above.

What are the offset null pins for?

With both inputs at the same voltage the output of a real op amp is not quite zero. On this common package a variable resistor between pins 1 and 5 trims that small offset away.

Can I practice here for “label the five op amp terminals with their names”?

Yes, for practice. That sentence is the instruction of a labeling exercise. This diagram is our own drawing and not a copy of any course figure, so your figure may place the inputs the other way up.

More quizzes

Show 6 more

Browse Science Quizzes