KA258AD Equivalent & Substitute Parts

Part Overview

The KA258AD is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a dual-channel amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, indicating it is no longer in active production. The KA258AD operates across a wide supply voltage range of 3V to 32V with an operating temperature range of -25°C to 85°C, making it suitable for general-purpose analog signal processing applications.

Due to its obsolete status, component sourcing for new designs or production runs requires identification of functionally equivalent alternatives. Substitute parts must maintain compatibility with the original electrical specifications, package form factor, and mounting requirements to ensure direct replacement capability without circuit redesign.

Key Parameters

Parameter	KA258AD Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Current - Input Bias	40	nA
Voltage - Input Offset	1	mV
Current - Supply	800	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-25 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the KA258AD is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:

Mandatory Compatibility Parameters:

Amplifier Type: General Purpose
Number of Circuits: 2 (dual-channel configuration)
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 3V, Maximum ≥32V
Current - Output / Channel: ≥30 mA

Electrical Performance Parameters:

Current - Input Bias: ≤45 nA (KA258AD specifies 40 nA)
Voltage - Input Offset: ≤2 mV (KA258AD specifies 1 mV)
Current - Supply: ≤1.5 mA per channel (KA258AD specifies 800 µA)

Substitute parts are grouped into two categories based on amplifier technology and performance characteristics:

Category 1: Standard General-Purpose Amplifiers (LM258, LM2904, LM358 series) These devices maintain the baseline electrical specifications of the KA258AD with 1 MHz gain-bandwidth product and are available in active production status with RoHS3 compliance.

Category 2: Enhanced Performance Amplifiers (MC34072 series) These devices provide improved electrical characteristics including higher gain-bandwidth product (4.5 MHz), lower input offset voltage (500 µV to 1 mV), and extended supply voltage range (up to 44V), suitable for applications requiring superior performance margins.

Category 3: Automotive-Grade Amplifiers (NCV2904, AD8682) These devices offer extended temperature ranges and automotive qualification, with the NCV2904 providing automotive-grade reliability and the AD8682 offering J-FET input technology for ultra-low input bias current (6 pA).

Parameter Comparison

Part Number	Manufacturer	Product Status	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	GBW (MHz)
KA258AD	onsemi	Obsolete	40	1	800	30	3	32	-25 to 85	—
LM258DR2G	onsemi	Active	45	2	800	40	3	32	-25 to 85	1
LM2904DR2G	onsemi	Active	45	2	800	40	3	26	-40 to 85	1
LM2904VDR2G	onsemi	Active	45	7	1500	40	3	32	-40 to 125	1
LM358ADR2G	onsemi	Active	45	2	800	40	3	32	0 to 70	1
LM358DR2G	onsemi	Active	45	2	800	40	3	32	0 to 70	1
MC34072ADR2G	onsemi	Active	100	0.5	1900	30	3	44	0 to 70	4.5
MC34072DR2G	onsemi	Active	100	1	1900	30	3	44	0 to 70	4.5
MC34072VDR2G	onsemi	Active	100	1	1900	30	3	44	-40 to 125	4.5
NCV2904DR2G	onsemi	Active	45	7	1500	40	3	32	-40 to 125	1
AD8682ARZ-REEL7	Analog Devices Inc.	Active	0.006	0.35	210	12	9	36	-40 to 85	3.5

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement Capability):

The LM258DR2G and LM358DR2G are the preferred direct substitutes for the KA258AD. Both devices are manufactured by onsemi, maintain active production status with RoHS3 compliance, and provide electrical specifications within acceptable tolerance of the original part. The LM258DR2G offers identical supply current (800 µA) and improved output current capability (40 mA vs. 30 mA). Both parts are available in high inventory quantities, ensuring supply chain reliability.

Extended Temperature Range Alternatives:

The LM2904VDR2G and NCV2904DR2G extend the operating temperature range to -40°C to 125°C, accommodating applications requiring enhanced thermal performance. The NCV2904DR2G is specifically qualified for automotive applications. These alternatives maintain the 3V to 32V supply voltage range and provide 40 mA output current per channel. Higher supply current consumption (1.5 mA vs. 800 µA) must be evaluated in power-constrained applications.

Enhanced Performance Substitutes:

The MC34072 series (ADR2G, DR2G, VDR2G variants) provides superior electrical characteristics including 4.5 MHz gain-bandwidth product, lower input offset voltage (500 µV to 1 mV), and extended supply voltage range (up to 44V). These devices are suitable for applications requiring improved signal fidelity and wider supply voltage tolerance. The MC34072VDR2G variant supports the extended temperature range (-40°C to 125°C).

Specialized Application Substitute:

The AD8682ARZ-REEL7 from Analog Devices Inc. employs J-FET input technology, delivering ultra-low input bias current (6 pA) and superior input offset voltage (350 µV). This device is appropriate for high-impedance signal conditioning applications. The minimum supply voltage requirement of 9V and reduced output current capability (12 mA) limit applicability to designs with adequate supply voltage and moderate output current demands.

Compliance and Production Status:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with modern manufacturing standards. Active production status guarantees long-term component availability and supply chain stability compared to the obsolete KA258AD.

Frequently Asked Questions (FAQ)

Q: Can the LM258DR2G directly replace the KA258AD without circuit modification?

A: Yes. The LM258DR2G maintains identical package form factor (8-SOIC), pinout compatibility, and electrical specifications within acceptable engineering tolerance. The supply voltage range (3V to 32V), input bias current (45 nA vs. 40 nA), and output current capability (40 mA vs. 30 mA) are compatible with KA258AD circuit designs. No circuit redesign is required.

Q: What is the primary difference between LM258DR2G and LM2904DR2G?

A: The LM2904DR2G provides extended operating temperature range (-40°C to 85°C vs. -25°C to 85°C) and extended lower temperature operation. However, the LM2904DR2G maximum supply voltage is limited to 26V compared to the KA258AD specification of 32V. For applications requiring the full 32V supply range, the LM258DR2G is the appropriate selection.

Q: When should the MC34072 series be selected over standard LM258/LM358 alternatives?

A: The MC34072 series is selected when applications require improved signal fidelity through higher gain-bandwidth product (4.5 MHz vs. 1 MHz), lower input offset voltage (500 µV to 1 mV vs. 2 mV), or extended supply voltage range (up to 44V vs. 32V). These enhancements provide superior performance margins in precision analog signal conditioning, instrumentation, and audio applications.

Q: Is the AD8682ARZ-REEL7 a suitable substitute for general-purpose applications?

A: The AD8682ARZ-REEL7 is not a general substitute for the KA258AD in all applications. While it provides exceptional input bias current performance (6 pA), the minimum supply voltage requirement of 9V, reduced output current capability (12 mA), and higher cost restrict its use to high-impedance signal conditioning applications where ultra-low input bias current is a critical design requirement.

Q: What is the significance of the NCV2904DR2G automotive qualification?

A: The NCV2904DR2G is qualified to automotive industry standards and supports extended operating temperature range (-40°C to 125°C). This device is appropriate for automotive and industrial applications requiring enhanced thermal performance and reliability certification. Standard commercial-grade alternatives (LM258, LM358) are not suitable for automotive applications requiring formal qualification.

Q: How does supply current consumption affect substitute selection?

A: The KA258AD specifies 800 µA supply current. Substitutes with higher supply current (LM2904VDR2G, NCV2904DR2G, MC34072 series at 1.5 mA to 1.9 mA) require evaluation in power-constrained applications such as battery-powered or low-power systems. The AD8682ARZ-REEL7 with 210 µA supply current is advantageous for ultra-low-power applications. For standard applications with adequate power supply capacity, supply current differences are not a limiting factor.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package form factor, ensuring PCB footprint compatibility. Packaging variants include Cut Tape (CT) & Digi-Reel® for standard commercial applications and Tape & Reel (TR) for high-volume production. Selection between packaging options depends on procurement volume and assembly process requirements, not electrical compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with modern manufacturing and environmental standards. The obsolete KA258AD does not carry RoHS3 certification, making active-production substitutes mandatory for new designs and production runs subject to RoHS3 requirements.

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