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Dual full-bridge motor driver

L298 Internal Circuitry

Explore the internal circuitry and functional stages of L298.

Package view

Inside L298

Two bipolar full bridges inside the package; one shown in detail.

Inside the L298 body, logic controls four switches around a motor output pair. The upper devices use VS; lower devices return through SENSE A. A second identical bridge uses SENSE B.
Functional switching diagram, not a transistor-level die schematic. Required flyback diodes are external.

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Select a stage to see its role and connections

Logic controls the switches

Direction inputs choose output states only while the corresponding enable is HIGH.

The output pair forms a bridge

Diagonal devices reverse the motor voltage; equal outputs command braking.

Sense returns remain accessible

The two low-side emitters share SENSE A; the other bridge uses SENSE B. External circuitry can measure these currents.

Component view