LM324MTX Equivalent & Substitute Parts

Part Overview

The LM324MTX is a general-purpose operational amplifier featuring four independent circuits in a 14-TSSOP 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 a gain bandwidth product of 1 MHz. The LM324MTX is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current RoHS3 compliance and active product status requirements.

Key Parameters

Parameter	LM324MTX 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-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the LM324MTX are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Four independent operational amplifier circuits
General-purpose amplifier type (unless specified as alternative technology)
14-TSSOP or compatible package footprint (0.173", 4.40mm Width)
Surface mount mounting type
Supply voltage range minimum of 3V and maximum of 30V or greater
Input offset voltage of 2 mV or lower
Output current per channel of 30 mA or greater
Input bias current within acceptable operational range

Substitution Categories:

Category 1: Direct Equivalents (Active Status, RoHS3 Compliant) Parts maintaining identical electrical specifications and package compatibility with active product status and RoHS3 compliance. These include LM324MTX/NOPB, LM324DTBR2G, and LM224DTBR2G.

Category 2: Manufacturer Recommended Alternatives (Enhanced Specifications) Parts with improved electrical performance characteristics while maintaining core functional compatibility. LM324APWR and LM224APT provide enhanced slew rate and gain bandwidth product specifications.

Category 3: Alternative Technology Substitutes Parts utilizing different amplifier technology (J-FET) or alternative manufacturers offering general-purpose four-circuit configurations. ADA4062-4ARUZ represents J-FET technology with superior input bias current performance.

Category 4: Extended Operating Range Substitutes Parts offering expanded temperature or supply voltage ranges. AS324GTR-G1 and BA3474FVJ-E2 provide extended operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	RoHS Status	Product Status
LM324MTX	Texas Instruments	General Purpose	1	45	2	40	3	32	0 to 70	14-TSSOP	Non-compliant	Obsolete
LM324MTX/NOPB	Texas Instruments	General Purpose	1	45	2	40	3	32	0 to 70	14-TSSOP	ROHS3 Compliant	Active
LM324APWR	Texas Instruments	General Purpose	1.2	15	2	30	3	30	0 to 70	14-TSSOP	ROHS3 Compliant	Active
LM324DTBR2G	onsemi	General Purpose	1	90	2	40	3	32	0 to 70	14-TSSOP	ROHS3 Compliant	Active
LM224APT	STMicroelectronics	General Purpose	1.3	20	2	40	3	30	-40 to 105	14-TSSOP	ROHS3 Compliant	Active
LM224DTBR2G	onsemi	General Purpose	1	90	2	40	3	32	-25 to 85	14-TSSOP	ROHS3 Compliant	Active
AS324GTR-G1	Diodes Incorporated	General Purpose	—	20	2	40	3	36	-40 to 85	14-TSSOP	ROHS3 Compliant	Active
BA2902FV-E2	Rohm Semiconductor	General Purpose	0.5	20	2	30	3	32	-40 to 125	14-LSSOP	ROHS3 Compliant	Active
BA2902SFV-E2	Rohm Semiconductor	General Purpose	0.5	20	2	30	3	32	-40 to 105	14-LSSOP	ROHS3 Compliant	Active
BA3474FVJ-E2	Rohm Semiconductor	General Purpose	4	100	1.5	30	3	36	-40 to 85	14-TSSOP	ROHS3 Compliant	Active
ADA4062-4ARUZ	Analog Devices Inc.	J-FET	1.4	0.002	0.75	20	10	30	-40 to 125	14-TSSOP	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LM324MTX/NOPB is the primary direct replacement, maintaining all electrical parameters of the obsolete LM324MTX while achieving active product status and RoHS3 compliance. This part is recommended for applications requiring no design modification.

For Enhanced Performance with Compatibility: LM324APWR provides improved input bias current (15 nA versus 45 nA) and enhanced gain bandwidth product (1.2 MHz versus 1 MHz) while maintaining the 14-TSSOP package and 3V to 30V supply range. This part is suitable for designs tolerating the reduced maximum supply voltage (30V versus 32V).

For Extended Temperature Range Applications: LM224APT extends the operating temperature range to -40°C to 105°C while maintaining core electrical specifications. This part accommodates industrial and automotive temperature requirements.

For Maximum Supply Voltage Retention: LM324DTBR2G and LM224DTBR2G preserve the 32V maximum supply voltage specification while providing active status and RoHS3 compliance. onsemi manufacturing ensures supply chain continuity.

For Extended Supply Voltage Range: AS324GTR-G1 extends the maximum supply voltage to 36V, accommodating applications requiring higher voltage operation within the general-purpose amplifier category.

For Superior Input Characteristics: ADA4062-4ARUZ employs J-FET input technology, delivering exceptional input bias current (2 pA) and reduced input offset voltage (750 µV). This part requires minimum supply voltage of 10V and is suitable for precision measurement and high-impedance input applications.

For Extended Temperature Range with Lower Bandwidth: BA2902FV-E2 and BA2902SFV-E2 provide operating ranges to -40°C to 125°C with reduced gain bandwidth product (500 kHz). These parts accommodate extreme temperature environments where bandwidth reduction is acceptable.

For High-Speed Applications: BA3474FVJ-E2 delivers 4 MHz gain bandwidth product and 10V/µs slew rate, supporting higher-frequency signal processing while maintaining the 14-TSSOP package.

All recommended substitutes maintain RoHS3 compliance and active product status, ensuring long-term supply availability and regulatory conformance.

Frequently Asked Questions (FAQ)

Q: Can LM324MTX/NOPB be used as a direct drop-in replacement for LM324MTX?

A: Yes. LM324MTX/NOPB maintains identical electrical specifications including gain bandwidth product (1 MHz), input bias current (45 nA), supply voltage range (3V to 32V), and 14-TSSOP package footprint. The primary difference is active product status and RoHS3 compliance. No circuit modifications are required.

Q: What is the key difference between LM324APWR and LM324MTX?

A: LM324APWR provides improved input bias current (15 nA versus 45 nA) and higher gain bandwidth product (1.2 MHz versus 1 MHz). The maximum supply voltage is reduced from 32V to 30V. Applications operating below 30V benefit from enhanced performance characteristics.

Q: Is ADA4062-4ARUZ compatible with LM324MTX in all applications?

A: ADA4062-4ARUZ employs J-FET input technology with significantly different electrical characteristics. The minimum supply voltage requirement is 10V (versus 3V for LM324MTX), and output current per channel is reduced to 20 mA (versus 40 mA). This part is suitable only for applications where these specifications are acceptable and where the superior input bias current (2 pA) provides design advantage.

Q: Can BA2902FV-E2 replace LM324MTX in high-frequency applications?

A: No. BA2902FV-E2 has a reduced gain bandwidth product of 500 kHz compared to LM324MTX at 1 MHz. Additionally, the package is 14-LSSOP rather than 14-TSSOP, requiring PCB layout modification. This part is suitable only for low-frequency applications where bandwidth reduction is acceptable.

Q: What are the package compatibility considerations for substitute selection?

A: Most substitutes utilize the 14-TSSOP package (0.173", 4.40mm Width), which is mechanically and electrically compatible with LM324MTX. BA2902FV-E2 and BA2902SFV-E2 use 14-LSSOP (14-SSOP-B) package, which has different pin spacing and requires PCB redesign. Verify package footprint compatibility before selection.

Q: Which substitute provides the widest operating temperature range?

A: BA2902FV-E2 and ADA4062-4ARUZ both support -40°C to 125°C operating range. BA2902FV-E2 is a general-purpose amplifier, while ADA4062-4ARUZ is J-FET technology. Selection depends on bandwidth and input bias current requirements for the specific application.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant. The original LM324MTX is RoHS non-compliant. Substitution ensures regulatory compliance for new designs and production.

Q: What is the inventory availability status for substitute parts?

A: LM324APWR has the highest inventory (105,200 pcs), followed by LM224DTBR2G (37,400 pcs) and LM224APT (25,875 pcs). ADA4062-4ARUZ has limited inventory (1,396 pcs). Inventory levels should be verified with suppliers for production planning.

Q: Can LM224APT be used in applications requiring 0°C to 70°C operation?

A: Yes. LM224APT supports -40°C to 105°C operating range, which encompasses the 0°C to 70°C requirement of LM324MTX. The extended range provides additional design margin without performance penalty.

Q: What is the primary advantage of BA3474FVJ-E2 over LM324MTX?

A: BA3474FVJ-E2 provides significantly higher gain bandwidth product (4 MHz versus 1 MHz) and faster slew rate (10V/µs versus unspecified). These characteristics support higher-frequency signal processing. Trade-offs include higher input bias current (100 nA versus 45 nA) and higher supply current (8 mA versus 1.5 mA).

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