KA324D Equivalent & Substitute Parts

Part Overview

The KA324D is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-SOIC surface mount package. Manufactured by onsemi, this device operates across a supply voltage range of 3 V to 32 V and is rated for operating temperatures from 0°C to 70°C. The KA324D is classified as an obsolete product, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA324D
Manufacturer	onsemi
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Current - Input Bias	40 nA
Voltage - Input Offset	1.5 mV
Current - Supply	1 mA
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	3 V
Voltage - Supply Span (Max)	32 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the KA324D is determined by the following critical parameters:

Functional Compatibility Requirements:

Number of circuits: 4 independent amplifier channels
Amplifier type: General purpose operation
Package type: 14-SOIC surface mount form factor
Supply voltage range: Minimum 3 V to maximum 32 V
Output current per channel: 40 mA
Mounting type: Surface mount

Electrical Performance Criteria:

Input bias current: 40 nA (KA324D specification)
Input offset voltage: 1.5 mV (KA324D specification)
Supply current: 1 mA (KA324D specification)

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Electrical Match (LM324 Series): Parts with input bias current of 40 nA and input offset voltage of 2 mV, maintaining compatibility with the KA324D's low-power characteristics. These include LM324ADR2G and LM324DR2G.

Category B - Extended Performance (LM2902 and MC34074 Series): Parts with input bias current of 90 nA to 100 nA and enhanced supply voltage capabilities or extended temperature ranges. These provide functional equivalence with relaxed electrical specifications suitable for general-purpose applications.

All substitute parts maintain the 14-SOIC package format, 4-circuit configuration, and surface mount mounting type required for direct board-level replacement.

Parameter Comparison

Parameter	KA324D	LM224DR2G	LM2902DR2G	LM2902VDR2G	LM324ADR2G	LM324DR2G	MC33074ADR2G	MC33074DR2G	MC34074ADR2G	MC34074DR2G	MC34074VDR2G
Manufacturer	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Current - Input Bias	40 nA	90 nA	90 nA	90 nA	40 nA	90 nA	100 nA	100 nA	100 nA	100 nA	100 nA
Voltage - Input Offset	1.5 mV	2 mV	2 mV	2 mV	2 mV	2 mV	500 µV	1 mV	500 µV	1 mV	1 mV
Current - Output / Channel	40 mA	40 mA	40 mA	40 mA	40 mA	40 mA	30 mA	30 mA	30 mA	30 mA	30 mA
Voltage - Supply Span (Min)	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	32 V	32 V	32 V	32 V	32 V	32 V	44 V	44 V	44 V	44 V	44 V
Operating Temperature	0°C ~ 70°C	-25°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

LM324ADR2G and LM324DR2G are the preferred substitutes for the KA324D. Both parts maintain identical input bias current specifications (40 nA), matching the KA324D's low-power design intent. These devices are active products with ROHS3 compliance and operate within the same temperature range (0°C to 70°C) as the original part. The 14-SOIC package format ensures mechanical and electrical compatibility without PCB redesign.

Extended Temperature Range Alternatives:

LM2902DR2G and LM2902VDR2G provide functional equivalence with extended operating temperature ranges (-40°C to 105°C and -40°C to 125°C respectively). These parts accept the relaxed input bias current specification of 90 nA while maintaining all other critical parameters. Selection of these variants is appropriate for applications requiring operation beyond the standard 0°C to 70°C range.

Enhanced Performance Alternatives:

MC34074ADR2G and MC34074DR2G offer improved electrical performance with lower input offset voltage (500 µV to 1 mV) and extended maximum supply voltage (44 V versus 32 V). These parts are suitable for applications requiring higher supply voltage capability or improved precision. Output current per channel is reduced to 30 mA, which must be evaluated against application requirements.

Compliance and Availability:

All recommended substitute parts are manufactured by onsemi, carry ROHS3 compliance certification, and maintain MSL 1 (Unlimited) moisture sensitivity rating. All parts are currently in active production status with substantial inventory availability, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LM324ADR2G directly replace KA324D without circuit modification?

A: Yes. LM324ADR2G maintains identical input bias current (40 nA), compatible input offset voltage (2 mV versus 1.5 mV), matching supply voltage range (3 V to 32 V), and identical 14-SOIC package format. Operating temperature range is identical (0°C to 70°C). No circuit modifications are required for direct substitution.

Q: What is the difference between LM324DR2G and LM2902DR2G?

A: Both parts contain four general-purpose amplifier circuits in 14-SOIC packages. LM324DR2G specifies input bias current of 90 nA and operates from 0°C to 70°C. LM2902DR2G also specifies 90 nA input bias current but extends the operating temperature range to -40°C to 105°C. Selection depends on application temperature requirements.

Q: Why do MC34074 parts have lower output current per channel (30 mA versus 40 mA)?

A: MC34074 devices are designed with enhanced performance characteristics including lower input offset voltage and higher slew rate. The reduced output current specification reflects the different internal design architecture. Applications requiring 40 mA output current per channel should use LM324 or LM2902 series parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original KA324D does not specify RoHS status due to its obsolete classification. All active substitute parts meet current environmental compliance requirements.

Q: Can MC34074VDR2G be used in applications requiring operation above 85°C?

A: Yes. MC34074VDR2G is rated for operating temperatures from -40°C to 125°C, making it suitable for high-temperature applications. This part maintains all other electrical specifications of the MC34074 series while providing the widest temperature range among available substitutes.

Q: What packaging format differences exist among the substitute parts?

A: All substitute parts are available in 14-SOIC surface mount packages with identical physical dimensions (0.154" width, 3.90mm). Packaging variations relate to distribution format: Cut Tape (CT) & Digi-Reel for standard production quantities, and Tape & Reel (TR) for higher-volume automated assembly. These differences do not affect electrical or mechanical compatibility.

Q: Is the KA324D still available for purchase?

A: The KA324D is classified as an obsolete product. While limited inventory may exist through component distributors, new production has ceased. Substitution with active products such as LM324ADR2G or LM324DR2G is recommended for new designs and ongoing production support.

Q: What is the significance of the input bias current difference between KA324D (40 nA) and LM2902 series (90 nA)?

A: Input bias current affects circuit performance in high-impedance applications. The KA324D's 40 nA specification provides lower input current, beneficial for precision instrumentation. LM2902 series at 90 nA remains suitable for general-purpose applications but may require input impedance considerations in sensitive circuits. Application-specific evaluation is necessary for high-impedance designs.

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