LM324MX Equivalent & Substitute Parts

Part Overview

The LM324MX is a general-purpose operational amplifier integrated circuit featuring 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 with an operating temperature range of 0°C to 70°C. The LM324MX is classified as an obsolete product, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. The device specifications include a gain bandwidth product of 800 kHz, input bias current of 40 nA, and output current capability of 30 mA per channel.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM324MX
Manufacturer	onsemi
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Gain Bandwidth Product	800 kHz
Current - Input Bias	40 nA
Voltage - Input Offset	1.5 mV
Current - Supply	1 mA
Current - Output / Channel	30 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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM324MX is determined by the following critical parameters: package compatibility (14-SOIC form factor), number of circuits (4 independent amplifiers), supply voltage range (minimum 3 V, maximum 32 V), operating temperature range, and electrical performance characteristics including gain bandwidth product, input bias current, and output current capability.

The substitute parts are grouped into two categories:

Direct Substitutes (Same Base Product - LM324 Series): Parts that maintain the LM324 base product designation with identical circuit topology and pin configuration. These include LM324DR2G and LM324ADR2G, which provide active product status and RoHS3 compliance while maintaining the 14-SOIC package format.

Functional Equivalents (Alternative Base Products): Parts that provide equivalent operational amplifier functionality with four circuits in the same 14-SOIC package but from different product lines. These include LM224DR2G (LM224 series), LM2902DR2G and LM2902VDR2G (LM2902 series), and MC34074 series variants (MC34074ADR2G, MC34074DR2G, MC34074VDR2G). These alternatives maintain the 14-SOIC package, four-circuit configuration, and supply voltage compatibility while offering extended temperature ranges and improved performance specifications in active product status.

Enhanced Performance Alternatives (MC33074 Series): Parts that provide superior electrical performance with higher gain bandwidth product (4.5 MHz versus 800 kHz), improved slew rate (13 V/µs), and extended supply voltage range (up to 44 V) while maintaining the 14-SOIC package and four-circuit configuration. These include MC33074ADR2G, MC33074DR2G, and MC33074VDR2G.

Parameter Comparison

Part Number	Manufacturer	Product Status	Number of Circuits	Gain Bandwidth Product	Current - Input Bias	Voltage - Input Offset	Current - Output / Channel	Voltage - Supply Span (Min)	Voltage - Supply Span (Max)	Operating Temperature	Package / Case	RoHS Status
LM324MX	onsemi	Obsolete	4	800 kHz	40 nA	1.5 mV	30 mA	3 V	32 V	0°C ~ 70°C	14-SOIC	RoHS non-compliant
LM324DR2G	onsemi	Active	4	1 MHz	90 nA	2 mV	40 mA	3 V	32 V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant
LM224DR2G	onsemi	Active	4	1 MHz	90 nA	2 mV	40 mA	3 V	32 V	-25°C ~ 85°C	14-SOIC	ROHS3 Compliant
LM2902DR2G	onsemi	Active	4	1 MHz	90 nA	2 mV	40 mA	3 V	32 V	-40°C ~ 105°C	14-SOIC	ROHS3 Compliant
LM2902VDR2G	onsemi	Active	4	1 MHz	90 nA	2 mV	40 mA	3 V	32 V	-40°C ~ 125°C	14-SOIC	ROHS3 Compliant
LM324ADR2G	onsemi	Active	4	1 MHz	40 nA	2 mV	40 mA	3 V	32 V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant
MC33074ADR2G	onsemi	Active	4	4.5 MHz	100 nA	500 µV	30 mA	3 V	44 V	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC33074DR2G	onsemi	Active	4	4.5 MHz	100 nA	1 mV	30 mA	3 V	44 V	-40°C ~ 85°C	14-SOIC	ROHS3 Compliant
MC34074ADR2G	onsemi	Active	4	4.5 MHz	100 nA	500 µV	30 mA	3 V	44 V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant
MC34074DR2G	onsemi	Active	4	4.5 MHz	100 nA	1 mV	30 mA	3 V	44 V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant
MC34074VDR2G	onsemi	Active	4	4.5 MHz	100 nA	1 mV	30 mA	3 V	44 V	-40°C ~ 125°C	14-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Minimum Design Changes:

LM324ADR2G is the optimal direct substitute for the LM324MX. This part maintains the LM324 base product designation, identical input bias current specification (40 nA), and matching operating temperature range (0°C ~ 70°C). The LM324ADR2G is in active product status with ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the LM324MX. The package format remains 14-SOIC, ensuring mechanical compatibility. The gain bandwidth product increases from 800 kHz to 1 MHz, and output current capability improves from 30 mA to 40 mA per channel, providing enhanced performance margins without requiring circuit redesign.

For Applications Requiring Extended Temperature Range:

LM2902DR2G and LM2902VDR2G provide extended operating temperature ranges (-40°C ~ 105°C and -40°C ~ 125°C respectively) while maintaining the 14-SOIC package and four-circuit configuration. These parts are suitable for industrial and automotive applications requiring broader temperature operation. Both are in active product status with ROHS3 compliance.

For Applications Requiring Enhanced Performance:

MC34074ADR2G, MC34074DR2G, and MC34074VDR2G offer superior electrical performance with gain bandwidth product of 4.5 MHz (compared to 800 kHz in the LM324MX), improved slew rate of 13 V/µs, and extended supply voltage range up to 44 V. These parts are appropriate for applications requiring higher bandwidth and faster signal processing. All variants are in active product status with ROHS3 compliance. Temperature range selection depends on application requirements: MC34074ADR2G for 0°C ~ 70°C, MC34074DR2G for 0°C ~ 70°C, and MC34074VDR2G for -40°C ~ 125°C.

For Regulatory Compliance:

All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete LM324MX. All substitute parts are in active product status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LM324DR2G be used as a direct replacement for LM324MX?

A: LM324DR2G is functionally compatible with LM324MX in the same 14-SOIC package with four circuits and matching supply voltage range (3 V to 32 V). However, electrical specifications differ: input bias current increases from 40 nA to 90 nA, and gain bandwidth product increases from 800 kHz to 1 MHz. LM324ADR2G is the preferred direct substitute as it maintains the 40 nA input bias current specification while providing active product status and ROHS3 compliance.

Q: What is the difference between LM324ADR2G and LM324DR2G?

A: Both parts are LM324 base product variants in active status with ROHS3 compliance and 14-SOIC packaging. The primary difference is input bias current: LM324ADR2G specifies 40 nA (matching the LM324MX), while LM324DR2G specifies 90 nA. For applications sensitive to input bias current, LM324ADR2G provides closer electrical equivalence to the original LM324MX.

Q: Are MC34074 series parts pin-compatible with LM324MX?

A: MC34074 series parts (MC34074ADR2G, MC34074DR2G, MC34074VDR2G) are pin-compatible with LM324MX, both using the 14-SOIC package with four independent amplifier circuits. However, MC34074 variants offer enhanced performance specifications including higher gain bandwidth product (4.5 MHz versus 800 kHz) and extended supply voltage range (up to 44 V versus 32 V). These differences may require circuit verification in bandwidth-sensitive or high-voltage applications.

Q: What is the advantage of LM2902VDR2G over LM324ADR2G?

A: LM2902VDR2G extends the operating temperature range to -40°C ~ 125°C compared to LM324ADR2G at 0°C ~ 70°C. Both parts maintain the 14-SOIC package, four-circuit configuration, and 3 V to 32 V supply voltage range. LM2902VDR2G is suitable for applications requiring operation across wider temperature extremes, particularly in automotive and industrial environments. Both are ROHS3 compliant and in active product status.

Q: Can LM224DR2G replace LM324MX in all applications?

A: LM224DR2G is functionally compatible with LM324MX in the 14-SOIC package with four circuits and matching supply voltage range. The operating temperature range extends from -25°C ~ 85°C compared to LM324MX at 0°C ~ 70°C. Input bias current increases from 40 nA to 90 nA. LM224DR2G is suitable for applications operating below 0°C or above 70°C within the specified range. For applications requiring the original 40 nA input bias current specification, LM324ADR2G remains the preferred substitute.

Q: What packaging options are available for LM324 substitutes?

A: All substitute parts are available in 14-SOIC surface mount package format, matching the LM324MX package specification. Packaging variants differ in tape and reel configuration: LM324DR2G, LM224DR2G, LM324ADR2G, MC33074ADR2G, MC33074DR2G, MC34074ADR2G, and MC34074DR2G are supplied in Cut Tape (CT) & Digi-Reel® format. LM2902VDR2G and MC34074VDR2G are supplied in Tape & Reel (TR) format. Selection depends on production volume and assembly equipment compatibility.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete LM324MX. This compliance status is maintained across all LM324, LM224, LM2902, MC33074, and MC34074 variants provided in this reference.

Q: Which substitute part offers the best performance upgrade?

A: MC34074VDR2G provides the most comprehensive performance upgrade with gain bandwidth product of 4.5 MHz (versus 800 kHz), slew rate of 13 V/µs, extended supply voltage range to 44 V, and operating temperature range of -40°C ~ 125°C. This part is suitable for applications requiring higher bandwidth, faster transient response, and extended environmental operation. All performance enhancements are achieved while maintaining the 14-SOIC package and four-circuit configuration.

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