LM324AMX Equivalent & Substitute Parts

Part Overview

The LM324AMX is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments under the LinCMOS™ series, this device operates across a wide supply voltage range of 3 V to 32 V with an operating temperature range of 0°C to 70°C. The LM324AMX is classified as obsolete product status, which necessitates identification of equivalent and substitute components for new designs and ongoing production requirements. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1	MHz
Current - Input Bias	45	nA
Voltage - Input Offset	2	mV
Current - Supply	1.5	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM324AMX is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Package type: 14-SOIC surface mount configuration
Number of circuits: 4 independent amplifier stages
Gain bandwidth product: 1 MHz minimum
Supply voltage range: Minimum 3 V, maximum 32 V or greater
Input bias current: 45 nA or lower
Input offset voltage: 2 mV or lower
Output current per channel: 40 mA or greater
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (Texas Instruments & onsemi) Parts maintaining identical electrical specifications with active product status: LM324AMX/NOPB, LM224DR2G, and LM224ADT. These components feature matching gain bandwidth product, supply voltage range, and output current ratings.

Category 2: Enhanced Performance Alternatives Parts exceeding baseline specifications in specific parameters while maintaining package compatibility and core functionality: AS324AMTR-E1 (Diodes Incorporated), BA10324AF-E2, BA2902F-E2, BA2902SF-E2 (Rohm Semiconductor), and LM124DT (STMicroelectronics). These alternatives offer improved input bias current, extended temperature ranges, or higher supply voltage maximums.

Category 3: Premium Performance Substitutes Parts with significantly enhanced specifications for applications requiring superior performance: ADA4000-4ARZ-R7 and ADA4004-4ARZ (Analog Devices Inc.). These J-FET and iPolar® technology devices provide lower input bias current, higher gain bandwidth product, and extended operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Gain BW (MHz)	Input Bias (nA)	Input Offset (mV/µV)	Supply Min (V)	Supply Max (V)	Output Current (mA)	Temp Range (°C)	Package
LM324AMX	Texas Instruments	Obsolete	General Purpose	1	45	2 mV	3	32	40	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	General Purpose	1	45	2 mV	3	32	40	0 to 70	14-SOIC
AS324AMTR-E1	Diodes Incorporated	Active	General Purpose	1	20	2 mV	3	36	40	-40 to 85	14-SOIC
ADA4000-4ARZ-R7	Analog Devices Inc.	Active	J-FET	5	0.005	0.2 µV	8	36	28	-40 to 125	14-SOIC
ADA4004-4ARZ	Analog Devices Inc.	Active	General Purpose	12	40	0.04 µV	10	30	10	-40 to 125	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	General Purpose	0.5	20	2 mV	3	32	35	-40 to 85	14-SOP
BA2902F-E2	Rohm Semiconductor	Active	General Purpose	0.5	20	2 mV	3	32	30	-40 to 125	14-SOP
BA2902SF-E2	Rohm Semiconductor	Active	General Purpose	0.5	20	2 mV	3	32	30	-40 to 105	14-SOP
LM124DT	STMicroelectronics	Active	General Purpose	1.3	20	2 mV	3	30	40	-55 to 125	14-SO
LM224ADT	STMicroelectronics	Active	General Purpose	1.3	20	2 mV	3	30	40	-40 to 105	14-SO
LM224DR2G	onsemi	Active	General Purpose	1	90	2 mV	3	32	40	-25 to 85	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: LM324AMX/NOPB

The LM324AMX/NOPB from Texas Instruments is the direct active equivalent of the obsolete LM324AMX. This part maintains identical electrical specifications across all critical parameters: 1 MHz gain bandwidth product, 45 nA input bias current, 2 mV input offset voltage, 3 V to 32 V supply range, and 40 mA output current per channel. The part is RoHS3 compliant with MSL rating of 1 (Unlimited) and carries active product status with 36,756 units in stock. This substitution requires no circuit redesign and provides full functional compatibility.

Secondary Recommendation: AS324AMTR-E1

The AS324AMTR-E1 from Diodes Incorporated offers enhanced performance characteristics while maintaining the 14-SOIC package and core electrical specifications. This part features improved input bias current (20 nA versus 45 nA), extended supply voltage maximum (36 V versus 32 V), and expanded operating temperature range (-40°C to 85°C versus 0°C to 70°C). RoHS3 compliance and MSL rating of 1 are maintained. This substitution is suitable for applications requiring lower input bias current or extended temperature operation.

Tertiary Recommendation: LM224ADT

The LM224ADT from STMicroelectronics provides active product status with enhanced specifications. This part features improved input bias current (20 nA), slightly higher gain bandwidth product (1.3 MHz), and extended operating temperature range (-40°C to 105°C). The 14-SO package is mechanically compatible with the 14-SOIC footprint. RoHS3 compliance and MSL rating of 1 are maintained. This substitution is appropriate for applications requiring extended temperature operation.

Premium Alternative: ADA4004-4ARZ

The ADA4004-4ARZ from Analog Devices Inc. represents a premium performance upgrade for applications requiring superior specifications. This iPolar® technology device features 12 MHz gain bandwidth product, 40 nA input bias current, and 0.04 µV input offset voltage. Operating temperature range extends to -40°C to 125°C. The 14-SOIC package maintains mechanical compatibility. Note: MSL rating is 3 (168 Hours) and supply voltage minimum is 10 V. This substitution is suitable only for applications with supply voltages of 10 V or greater.

Compliance Verification:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. All parts carry ECCN classification EAR99 and HTSUS code 8542.33.0001, matching the original part's regulatory classification.

Frequently Asked Questions (FAQ)

Q: Can LM324AMX/NOPB be used as a direct replacement for LM324AMX?

A: Yes. The LM324AMX/NOPB is the active production equivalent of the obsolete LM324AMX. All electrical parameters, package configuration, and compliance certifications are identical. No circuit modifications are required.

Q: What is the primary difference between LM324AMX and AS324AMTR-E1?

A: The AS324AMTR-E1 features lower input bias current (20 nA versus 45 nA), extended supply voltage maximum (36 V versus 32 V), and wider operating temperature range (-40°C to 85°C versus 0°C to 70°C). Both maintain the 14-SOIC package and 1 MHz gain bandwidth product. The AS324AMTR-E1 is suitable for applications requiring improved input bias characteristics or extended temperature operation.

Q: Are Rohm Semiconductor BA10324AF-E2 and BA2902F-E2 compatible with LM324AMX?

A: These parts are mechanically compatible in 14-SOP package format but feature reduced gain bandwidth product (0.5 MHz versus 1 MHz) and lower output current per channel (30-35 mA versus 40 mA). These substitutes are suitable only for applications where the reduced bandwidth and output current specifications are acceptable.

Q: What is the significance of the MSL rating difference in ADA4004-4ARZ?

A: The ADA4004-4ARZ carries MSL rating of 3 (168 Hours) compared to MSL rating of 1 (Unlimited) for the LM324AMX. MSL rating 3 requires moisture bake-out procedures before reflow soldering if the component has been exposed to ambient humidity for more than 168 hours. This adds manufacturing process complexity and is not required for the original part or most recommended substitutes.

Q: Can ADA4000-4ARZ-R7 replace LM324AMX in all applications?

A: The ADA4000-4ARZ-R7 is a J-FET technology device with significantly enhanced specifications (5 MHz bandwidth, 5 pA input bias current, 0.2 µV input offset voltage). However, the minimum supply voltage is 8 V, which exceeds the LM324AMX minimum of 3 V. This substitute is suitable only for applications with supply voltages of 8 V or greater. Additionally, output current per channel is reduced to 28 mA.

Q: What packaging considerations apply to STMicroelectronics LM124DT and LM224ADT?

A: Both parts use 14-SO package designation, which is mechanically compatible with the 14-SOIC footprint of the LM324AMX. The physical dimensions and pin configuration allow direct PCB substitution without layout modifications.

Q: Why does LM224DR2G show higher input bias current (90 nA) than LM324AMX (45 nA)?

A: The LM224DR2G from onsemi exhibits higher input bias current specification, which may impact circuit performance in applications sensitive to bias current. This part is suitable for applications where the 90 nA specification is within design tolerance. The part maintains identical supply voltage range, output current, and package configuration.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 compliance certification, matching the regulatory status of the original LM324AMX. All parts are also REACH unaffected and carry identical ECCN and HTSUS classifications.

Q: What is the inventory status of recommended substitutes?

A: LM324AMX/NOPB has 36,756 units in stock. AS324AMTR-E1 has 20,644 units. LM224DR2G has 105,200 units. BA10324AF-E2 has 67,700 units. All recommended primary and secondary substitutes maintain substantial inventory levels suitable for production requirements.

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