LM1458MX

Overview

The LM1458MX is a dual operational amplifier manufactured by National Semiconductor, now part of Texas Instruments. It features two independent amplifiers sharing a common bias network and power supply leads. Key electrical parameters include a gain-bandwidth product of 1 MHz, a slew rate of 500 mV/us, and an input offset voltage of 6 mV. The device operates within a supply voltage range of 6 V to 36 V (single) or 3 V to 18 V (dual), with a maximum operating supply current of 3 mA. It provides an output current of 45 mA per channel and offers a common-mode rejection ratio of 90 dB.

Feature Summary

• General-purpose dual operational amplifier design
• Shared common bias network and power supply leads for both channels
• High common-mode rejection ratio capability

Applications

• Audio pre-amplification circuits
• Active filter implementations
• DC gain blocks in instrumentation systems

Procurement Notes

Verify the manufacturer origin, as National Semiconductor was acquired by Texas Instruments. Confirm the package type matches the required PCB footprint, specifically the SOIC-8 narrow variant for the MX suffix. Ensure RoHS compliance documentation aligns with project requirements. Cross-reference the specific suffix (e.g., NOPB) for lead-free status if necessary. Validate that the supply voltage limits meet the target circuit's operational constraints.

Selection Notes

Select this component for applications requiring general-purpose dual amplification with moderate bandwidth. Consider the shared bias network when designing for low-power consumption. Evaluate the input offset voltage and bias current specifications against signal integrity requirements. Compare performance metrics with single-channel alternatives if space or cost is a primary constraint. Ensure the thermal characteristics suit the intended operating environment.

Part Context

The LM1458 belongs to the broader family of dual operational amplifiers, closely related to the LM1558 which shares similar architecture but may differ in temperature ranges or specific electrical tolerances. This series is widely used in commercial and industrial applications due to its versatility and established reliability. The MX designation indicates a surface-mount SOIC package, distinguishing it from through-hole variants like the N suffix.

Replacement Considerations

Public confirmed substitutes include the LM1558 for similar dual op-amp functionality. Other compatible parts listed in datasheets include TA75458P, UTCMC4558, BA4558, HA17458, and IL4580. Verify pin compatibility and electrical parameter overlaps before substitution.