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Quad operational amplifier

LM324 Internal Circuitry

Explore the internal circuitry and functional stages of LM324.

Package view

Inside LM324

Four independent amplifiers share the same two power rails.

Four op-amp channels A through D, with individual plus inputs, minus inputs and outputs. All share VCC+ pin4 and VCC− pin11. Conceptual stages are differential input, voltage gain with compensation and output driver.
Functional architecture, not a transistor-level die schematic.

Explore the circuit

Select a stage to see its role and connections

Four differential inputs

Each channel has a separate input pair and output.

Compensated gain

Internal compensation supports unity-gain operation. Frequency response still limits fast signals.

Shared rails

Pin 4 supplies the positive rail and pin 11 the negative rail or ground.

Component view