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Dual general-purpose operational amplifier

LM1458 Internal Circuitry

Explore the internal circuitry and functional stages of LM1458.

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Inside LM1458

Two compensated input-to-output paths inside one eight-pin IC.

Two Bipolar-input amplifier channels inside a compact LM1458 IC. A: positive 3, negative 2, output 1. B: positive 5, negative 6, output 7. Shared supplies 8 and 4.
Functional cutaway; internal compensation is included. External feedback sets the gain.

Explore the circuit

Select a stage to see its role and connections

Input stages

Each bipolar differential input pair compares the applied signal against its feedback voltage. Input bias currents flowing in source and feedback resistances introduce additional voltage error.

Gain and compensation

Each channel has an internal voltage-gain path and frequency compensation.

Output drivers

The output stage drives the feedback network and load. Neither input common-mode range nor output swing reaches the rails. Short-circuit protection is a fault feature, not a useful load-current specification.

Component view