KA4558I Equivalent & Substitute Parts

Part Overview

The KA4558I is a general-purpose operational amplifier featuring two independent circuits in an 8-DIP through-hole package, manufactured by onsemi. This device is classified as obsolete, which necessitates identification of active equivalent components for continued system design and maintenance applications. The KA4558I operates across a wide supply voltage range and is suitable for analog signal processing applications requiring dual-channel amplification.

Substiute Parts

KA4558I

onsemiIn Stock: 1191KA4558I Datasheet

Current PartRFQ

RC4558P

Texas InstrumentsIn Stock: 25623RC4558P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KA4558I is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must utilize the 8-DIP through-hole package format to ensure mechanical and electrical compatibility with existing printed circuit board layouts.

Functional Equivalence: The substitute must provide two independent general-purpose operational amplifier circuits to maintain circuit functionality.

Electrical Performance: While the KA4558I operates with a 44 V supply span, substitute parts must support the voltage requirements of the target application. The RC4558P operates within a 10 V to 30 V supply range, which is compatible with standard dual-supply operational amplifier applications.

Thermal Operating Range: The substitute must cover the operating temperature requirements of the application. The RC4558P operates from 0°C to 70°C, which is suitable for commercial and industrial applications within this temperature band.

Compliance and Availability: The substitute part must be in active production status with current availability to ensure long-term supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

The RC4558P (Texas Instruments) is the active equivalent substitute for the obsolete KA4558I. Both devices share identical package geometry (8-DIP through-hole), circuit count (dual operational amplifiers), and functional classification (general-purpose amplifiers).

Supply Voltage Consideration: The KA4558I specifies a 44 V supply span, while the RC4558P operates within 10 V to 30 V. Applications utilizing the KA4558I at supply voltages exceeding 30 V require circuit redesign or alternative component selection. For standard dual-supply operational amplifier applications operating within ±15 V or ±12 V configurations, the RC4558P is directly substitutable.

Temperature Range Consideration: The KA4558I supports extended temperature operation from -40°C to 85°C. The RC4558P operates from 0°C to 70°C. Applications requiring operation below 0°C or above 70°C must evaluate alternative components or implement thermal management strategies.

Product Status: The RC4558P is in active production with established supply chain availability, providing long-term component sourcing reliability compared to the obsolete KA4558I.

Compliance: Both components maintain REACH Unaffected status and EAR99 export classification, ensuring regulatory consistency in component substitution.

Frequently Asked Questions (FAQ)

Q: Can the RC4558P directly replace the KA4558I in existing circuit designs?

A: Direct replacement is possible when the application operates within the RC4558P supply voltage range (10 V to 30 V) and temperature range (0°C to 70°C). If the original design utilizes the KA4558I at supply voltages exceeding 30 V, circuit modification is required.

Q: What are the key electrical differences between these two devices?

A: The RC4558P exhibits improved slew rate (1.7 V/µs versus 1.2 V/µs), lower input offset voltage (500 µV versus 3 mV), and reduced supply current (2.5 mA versus 3.5 mA per channel). The RC4558P has higher input bias current (150 nA versus 30 nA). These differences are within typical operational amplifier performance variations and do not prevent functional substitution in general-purpose applications.

Q: Are the package dimensions identical between KA4558I and RC4558P?

A: Yes. Both devices utilize the 8-DIP package with 0.300" (7.62 mm) spacing. Pin-to-pin compatibility is confirmed, allowing direct socket substitution without printed circuit board modification.

Q: What is the significance of the KA4558I being classified as obsolete?

A: Obsolete status indicates that onsemi has discontinued production and support for this component. The RC4558P, maintained in active production by Texas Instruments, provides continued availability and manufacturer technical support for new designs and legacy system maintenance.

Q: Does the RC4558P require different circuit biasing or compensation compared to the KA4558I?

A: Both devices are general-purpose operational amplifiers with similar frequency compensation characteristics. Standard operational amplifier circuit design practices apply to both components. No redesign of biasing networks or compensation circuits is required for substitution within the specified operating parameters.

Q: What packaging format is supplied for the RC4558P?

A: The RC4558P is supplied in tube packaging, whereas the KA4558I packaging format is not specified in the available data. Both devices are through-hole mounted components compatible with standard printed circuit board assembly processes.