LM324MX Equivalent & Substitute Parts

Part Overview

The LM324MX 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 3V to 32V with an operating temperature range of 0°C to 70°C. The LM324MX is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current RoHS and REACH compliance standards.

Key Parameters

Parameter	LM324MX	Unit
Amplifier Type	General Purpose	-
Number of Circuits	4	-
Gain Bandwidth Product	800	kHz
Current - Input Bias	45	nA
Voltage - Input Offset	2	mV
Current - Supply	1.5	mA
Current - Output / Channel	30	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	-
Product Status	Obsolete	-
RoHS Status	RoHS non-compliant	-

Substitute Part Grouping Explanation

Substitute parts for the LM324MX are categorized based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of Circuits: 4 independent amplifier circuits
Package / Case: 14-SOIC surface mount configuration
Amplifier Type: General Purpose operation
Supply Voltage Range: Minimum 3V to maximum 32V overlap
Operating Temperature: Compatibility with 0°C to 70°C range
Current - Input Bias: ≤ 45 nA
Voltage - Input Offset: ≤ 2 mV
Current - Output / Channel: ≥ 30 mA

Grouping Logic:

Group 1: Direct Texas Instruments Equivalents Parts maintaining identical base product number (LM324) with active product status and improved compliance. These devices preserve the LinCMOS™ architecture and general-purpose amplifier classification.

Group 2: Diodes Incorporated General Purpose Alternatives AS324 series devices provide equivalent general-purpose amplification with 14-SOIC packaging. These parts meet or exceed the electrical specifications of the LM324MX while offering active product status and full RoHS3 compliance.

Group 3: Rohm Semiconductor General Purpose Alternatives BA10324 and BA2902 series devices deliver general-purpose amplification in 14-SOP packaging with active status and RoHS3 compliance. These parts operate within the required supply voltage and temperature ranges.

Group 4: Analog Devices High-Performance Alternatives AD8513ARZ-REEL, ADA4000-4ARZ-R7, ADA4004-4ARZ, and ADA4004-4ARZ-RL represent enhanced performance options with J-FET or iPolar® input stages. These devices exceed baseline specifications in gain bandwidth product, input offset voltage, and operating temperature range while maintaining 14-SOIC packaging and active product status.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Gain Bandwidth Product (kHz)	Input Bias (nA)	Input Offset (mV)	Output / Channel (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Product Status	RoHS Status
LM324MX	Texas Instruments	General Purpose	800	45	2	30	3	32	0 to 70	14-SOIC	Obsolete	Non-compliant
LM324MX/NOPB	Texas Instruments	General Purpose	1000	45	2	40	3	32	0 to 70	14-SOIC	Active	ROHS3 Compliant
AS324AMTR-G1	Diodes Incorporated	General Purpose	-	20	2	40	3	36	-40 to 85	14-SOIC	Active	ROHS3 Compliant
AS324MTR-G1	Diodes Incorporated	General Purpose	-	20	2	40	3	36	-40 to 85	14-SOIC	Active	ROHS3 Compliant
BA10324AF-E2	Rohm Semiconductor	General Purpose	500	20	2	35	3	32	-40 to 85	14-SOIC	Active	ROHS3 Compliant
BA2902F-E2	Rohm Semiconductor	General Purpose	500	20	2	30	3	32	-40 to 125	14-SOIC	Active	ROHS3 Compliant
BA2902SF-E2	Rohm Semiconductor	General Purpose	500	20	2	30	3	32	-40 to 105	14-SOIC	Active	ROHS3 Compliant
AD8513ARZ-REEL	Analog Devices Inc.	J-FET	8000	0.025	0.1	70	10	30	-40 to 125	14-SOIC	Active	ROHS3 Compliant
ADA4000-4ARZ-R7	Analog Devices Inc.	J-FET	5000	0.005	0.2	28	8	36	-40 to 125	14-SOIC	Active	ROHS3 Compliant
ADA4004-4ARZ	Analog Devices Inc.	General Purpose	12000	40	0.04	10	10	30	-40 to 125	14-SOIC	Active	ROHS3 Compliant
ADA4004-4ARZ-RL	Analog Devices Inc.	General Purpose	12000	40	0.04	10	10	30	-40 to 125	14-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Minimal Design Impact:

LM324MX/NOPB is the primary recommended substitute. This Texas Instruments device maintains the LinCMOS™ architecture and general-purpose amplifier classification of the original LM324MX. It provides improved gain bandwidth product (1 MHz vs. 800 kHz) and increased output current capability (40 mA vs. 30 mA per channel). The part achieves active product status and ROHS3 compliance while preserving the identical 14-SOIC package and supply voltage range (3V to 32V). Operating temperature range remains 0°C to 70°C, ensuring compatibility with existing thermal specifications.

For Applications Requiring Extended Temperature Range:

AS324MTR-G1 (Diodes Incorporated) offers active product status with ROHS3 compliance and extended operating temperature range (-40°C to 85°C). This device maintains the 14-SOIC package and 3V to 36V supply range. Input bias current is reduced to 20 nA, and output current per channel reaches 40 mA. Inventory availability is substantial (196,751 pcs), supporting high-volume production requirements.

For Applications Requiring Enhanced Performance Specifications:

AD8513ARZ-REEL (Analog Devices Inc.) provides J-FET input architecture with significantly improved specifications: 8 MHz gain bandwidth product, 25 pA input bias current, and 100 µV input offset voltage. This device operates across -40°C to 125°C and maintains 14-SOIC packaging. Supply voltage range is 10V to 30V, requiring circuit redesign for applications operating below 10V.

ADA4004-4ARZ and ADA4004-4ARZ-RL (Analog Devices Inc.) deliver general-purpose amplification with iPolar® input stage technology. These devices achieve 12 MHz gain bandwidth product, 40 nA input bias current, and 40 µV input offset voltage. Operating temperature extends to -40°C to 125°C. Supply voltage range is 10V to 30V. These parts are suitable for precision applications requiring superior offset voltage performance.

Compliance Considerations:

All recommended substitute parts achieve ROHS3 compliance and REACH unaffected status, eliminating regulatory barriers for new designs. The original LM324MX is RoHS non-compliant and REACH affected, making transition to compliant alternatives mandatory for products subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q1: Can LM324MX/NOPB be used as a direct drop-in replacement for LM324MX?

A: LM324MX/NOPB is functionally compatible with LM324MX in applications operating within 0°C to 70°C. Both devices share identical 14-SOIC packaging, four-circuit configuration, and 3V to 32V supply range. The /NOPB variant offers improved specifications (1 MHz vs. 800 kHz gain bandwidth product, 40 mA vs. 30 mA output current) and active product status with ROHS3 compliance. No circuit modifications are required for substitution.

Q2: What is the primary difference between general-purpose and J-FET amplifier types in this comparison?

A: General-purpose amplifiers (LM324MX, LM324MX/NOPB, AS324 series, BA10324, BA2902, ADA4004) utilize bipolar input stages with input bias currents in the nanoampere range (20-45 nA). J-FET amplifiers (AD8513ARZ-REEL, ADA4000-4ARZ-R7) employ field-effect transistor input stages with picoampere-level input bias currents (0.025-5 pA). J-FET devices are preferred for high-impedance signal sources and applications requiring minimal input loading. General-purpose devices are suitable for standard signal conditioning and buffering applications.

Q3: Are AS324AMTR-G1 and AS324MTR-G1 interchangeable?

A: AS324AMTR-G1 and AS324MTR-G1 are electrically identical Diodes Incorporated devices with identical electrical specifications. The primary difference is packaging designation: AS324AMTR-G1 uses 14-SO package notation, while AS324MTR-G1 uses 14-SOIC package notation. Both devices are surface mount with equivalent pinout and performance. AS324MTR-G1 offers significantly higher inventory availability (196,751 pcs vs. 1,979 pcs).

Q4: What supply voltage considerations apply when selecting substitute parts?

A: The original LM324MX operates across 3V to 32V. Most general-purpose substitutes (LM324MX/NOPB, AS324 series, BA10324, BA2902) maintain this range. Rohm BA2902 variants extend maximum supply to 32V with operating temperatures to 105-125°C. Analog Devices J-FET and iPolar® devices (AD8513ARZ-REEL, ADA4000-4ARZ-R7, ADA4004 series) require minimum 8-10V supply, restricting use in low-voltage applications below 8V. Circuit redesign is necessary if supply voltage drops below 8V and J-FET or iPolar® devices are selected.

Q5: How do input offset voltage specifications affect circuit design?

A: Input offset voltage determines DC error at the amplifier output in the absence of input signal. LM324MX specifies 2 mV maximum offset. General-purpose substitutes (LM324MX/NOPB, AS324, BA10324, BA2902) maintain 2 mV specification. Analog Devices ADA4004 series reduces offset to 40 µV, and AD8513ARZ-REEL achieves 100 µV. Applications requiring precision DC amplification or integrator circuits benefit from lower offset voltage specifications. Standard AC-coupled signal conditioning applications are unaffected by offset voltage differences.

Q6: What is the significance of product status (Active vs. Obsolete) in component selection?

A: Product status indicates manufacturer support and long-term availability. Obsolete parts (LM324MX) are no longer manufactured and existing inventory will eventually deplete. Active parts (LM324MX/NOPB, AS324 series, BA10324, BA2902, AD8513ARZ-REEL, ADA4000-4ARZ-R7, ADA4004 series) are currently manufactured with guaranteed long-term availability. New designs must specify active parts to ensure supply chain continuity and manufacturing support throughout product lifecycle.

Q7: How does moisture sensitivity level (MSL) affect component handling?

A: Moisture sensitivity level indicates susceptibility to moisture-induced damage during storage and assembly. MSL 1 (Unlimited) parts require no special moisture control and can be stored indefinitely at room conditions. MSL 3 (168 Hours) parts (ADA4004-4ARZ, ADA4004-4ARZ-RL) require desiccant packaging and must be used within 168 hours of package opening. Standard manufacturing environments with controlled humidity typically accommodate MSL 3 components without additional process modifications.

Q8: What packaging considerations apply to 14-SOIC vs. 14-SOP designations?

A: 14-SOIC (Small Outline Integrated Circuit) and 14-SOP (Small Outline Package) are equivalent surface mount package types with identical pinout and mechanical dimensions (0.154" to 0.173" width, 3.90mm to 4.40mm). Both are compatible with standard PCB assembly equipment. Rohm BA10324AF-E2 and BA2902 series use 14-SOP designation with 4.40mm width, while other devices use 14-SOIC with 3.90mm width. PCB layout modifications may be required if switching between these width specifications.

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