KA4558

Overview

The KA4558 is a dual general-purpose operational amplifier manufactured by onsemi. It features two independent amplifiers within a single package, designed for broad analog signal processing applications. The device operates with a wide supply voltage range and includes internal frequency compensation to ensure stability in unity-gain configurations. Key electrical characteristics include a typical input offset voltage of 2mV and an input bias current of 80nA. It supports a slew rate of 0.5 V/µs and provides an output current capability of 20mA per channel. The component is available in surface-mount packaging such as the 8-SOIC format.

Feature Summary

• Dual-channel architecture providing two independent operational amplifiers in a compact footprint
• Internal frequency compensation eliminates the need for external components in most applications
• Wide operating supply voltage range suitable for diverse power environments
• Short-circuit protection safeguards the device during overload conditions

Applications

• General-purpose analog signal conditioning circuits
• Audio pre-amplification stages
• Active filter designs
• Voltage follower configurations

Procurement Notes

Verify the specific suffix codes against the official datasheet to confirm temperature range and package variations. Ensure compatibility with existing PCB footprints, particularly for SOIC-8 packages. Cross-reference pinouts with legacy equivalents if replacing older fabrication runs. Confirm RoHS compliance status for environmental regulations. Validate supplier authenticity through authorized distribution channels.

Selection Notes

Select this component when a cost-effective dual op-amp solution is required for standard analog tasks. Consider its moderate slew rate and bandwidth limitations compared to high-speed alternatives. Evaluate thermal performance requirements based on the chosen package type. Compare input offset voltage specifications against precision application needs. Assess power consumption constraints relative to the system's total budget.

Part Context

The KA4558 belongs to the broader family of dual operational amplifiers derived from the classic LM1558/MC1458 topology. This lineage ensures widespread industry recognition and pin compatibility with numerous other manufacturers' offerings. The part serves as a foundational building block in mixed-signal electronics, bridging discrete transistor designs and modern integrated solutions. Its enduring presence reflects reliability in non-critical, high-volume consumer and industrial applications.

Replacement Considerations

Direct pin-compatible substitutes include the MC1458, LM358, and TL082 series. Verify electrical parameter overlaps, specifically regarding input bias current and offset voltage, before substitution. Check package dimensions to ensure mechanical fit within the target assembly.