LP324MTX Equivalent & Substitute Parts

Part Overview

The LP324MTX is a general-purpose operational amplifier manufactured by Texas Instruments, housed in a 14-TSSOP surface-mount package. This device integrates four independent amplifier circuits suitable for low-speed signal processing applications. The LP324MTX is classified as obsolete, which necessitates identification of active alternative components that maintain functional and electrical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.05	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	2	nA
Voltage - Input Offset	2	mV
Current - Supply	85	µA
Current - Output / Channel	10	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

Substitution of the LP324MTX is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Four independent amplifier circuits
14-TSSOP surface-mount package (0.173", 4.40mm Width)
Supply voltage range: minimum 3 V, maximum 32 V or higher
Input offset voltage: 2 mV or lower
Output current per channel: 10 mA or higher

Performance Tier Classification:

Substitute parts are grouped into three performance categories based on gain-bandwidth product and slew rate:

Direct Functional Equivalents (100 kHz to 1.3 MHz GBW): Parts with similar or moderately enhanced performance characteristics, suitable for direct replacement in existing designs.
Enhanced Performance Alternatives (1 MHz to 4 MHz GBW): Parts with significantly higher bandwidth and slew rate, applicable when improved frequency response is beneficial or required.
Packaging and Compliance Variants: Parts with identical electrical specifications but different packaging formats (Tape & Reel vs. Cut Tape) or RoHS compliance status.

All substitute parts maintain the 14-TSSOP package form factor and support the 3 V to 32 V supply range. Substitutes with higher gain-bandwidth products and slew rates are backward-compatible for applications requiring lower performance specifications.

Parameter Comparison

Part Number	Manufacturer	GBW (kHz)	Slew Rate (V/µs)	Input Bias (nA)	Supply Current (µA/mA)	Output Current (mA)	Temp Range (°C)	Product Status	RoHS
LP324MTX	Texas Instruments	100	0.05	2	85µA	10	0 to 70	Obsolete	Non-compliant
LP324MTX/NOPB	Texas Instruments	100	0.05	2	85µA	10	0 to 70	Active	ROHS3 Compliant
BA2902FV-E2	Rohm Semiconductor	500	0.2	20	700µA	30	-40 to 125	Active	ROHS3 Compliant
BA3474FVJ-E2	Rohm Semiconductor	4000	10	100	8mA	30	-40 to 85	Active	ROHS3 Compliant
LM224APT	STMicroelectronics	1300	0.4	20	1.5mA	40	-40 to 105	Active	ROHS3 Compliant
LM224DTBR2G	onsemi	1000	—	90	—	40	-25 to 85	Active	ROHS3 Compliant
LM224PT	STMicroelectronics	1300	0.4	20	1.5mA	40	-40 to 105	Active	ROHS3 Compliant
LM2902AWYPT	STMicroelectronics	1300	0.4	20	1.5mA	40	-40 to 125	Active	ROHS3 Compliant
LM2902DTBR2G	onsemi	1000	—	90	—	40	-40 to 105	Active	ROHS3 Compliant
LM2902PT	Rohm Semiconductor	1300	0.3	20	1mA	30	-40 to 125	Obsolete	ROHS3 Compliant
LM2902VDTBR2G	onsemi	1000	—	90	—	40	-40 to 125	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

LP324MTX/NOPB is the primary direct substitute. This part maintains identical electrical specifications (100 kHz GBW, 0.05 V/µs slew rate, 85 µA supply current) while offering active product status and ROHS3 compliance. The /NOPB suffix indicates Tape & Reel packaging format, suitable for automated assembly processes.

For Active Product Status with Enhanced Performance:

LM224APT and LM224PT (both STMicroelectronics) provide 1.3 MHz gain-bandwidth product with 0.4 V/µs slew rate. These parts are active, ROHS3 compliant, and support extended operating temperature range (-40°C to 105°C). Higher output current (40 mA per channel) accommodates applications requiring increased drive capability.

LM2902VDTBR2G (onsemi) offers 1 MHz GBW with extended temperature range (-40°C to 125°C) and active product status. This part is suitable for industrial and automotive temperature environments.

For Maximum Performance Enhancement:

BA3474FVJ-E2 (Rohm Semiconductor) delivers 4 MHz gain-bandwidth product and 10 V/µs slew rate, representing a significant performance upgrade. This part is appropriate for applications requiring higher-frequency signal processing while maintaining the 14-TSSOP package footprint.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant, addressing regulatory requirements for new product designs. The original LP324MTX is RoHS non-compliant; migration to compliant alternatives is necessary for products subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can LP324MTX/NOPB be used as a direct replacement for LP324MTX?

A: Yes. LP324MTX/NOPB maintains identical electrical specifications and package form factor. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard). Both are suitable for 14-TSSOP surface-mount assembly.

Q: What is the key difference between LM224 and LM2902 series substitutes?

A: Both series provide four-channel general-purpose amplifiers in 14-TSSOP packages. LM224 variants (LM224APT, LM224PT, LM224DTBR2G) and LM2902 variants (LM2902DTBR2G, LM2902VDTBR2G, LM2902AWYPT) differ primarily in manufacturer (STMicroelectronics, onsemi, Rohm) and temperature rating specifications. Electrical performance is comparable within each series.

Q: Is BA3474FVJ-E2 compatible with LP324MTX applications?

A: BA3474FVJ-E2 is electrically compatible in terms of package and pin configuration. However, its significantly higher gain-bandwidth product (4 MHz vs. 100 kHz) and slew rate (10 V/µs vs. 0.05 V/µs) may introduce stability issues in circuits designed for the LP324MTX's lower bandwidth. Verification of circuit stability and compensation requirements is necessary before substitution.

Q: What does the /NOPB suffix indicate?

A: /NOPB indicates "No Plumbum" (lead-free) packaging in Tape & Reel format. This designation confirms RoHS compliance and suitability for automated pick-and-place assembly processes.

Q: Are all substitute parts available in 14-TSSOP package?

A: Yes. All substitute parts listed are available in 14-TSSOP (0.173", 4.40mm Width) surface-mount package, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: Which substitute offers the widest operating temperature range?

A: LM2902AWYPT, LM2902PT, and LM2902VDTBR2G all support -40°C to 125°C operating temperature range, compared to LP324MTX's 0°C to 70°C. These parts are suitable for industrial and automotive applications requiring extended temperature performance.

Q: Can I use a higher-performance substitute in a design originally specified for LP324MTX?

A: Higher-performance substitutes (LM224 series, LM2902 series, BA3474FVJ-E2) are backward-compatible for applications requiring lower bandwidth. However, circuit stability, compensation networks, and PCB layout may require re-evaluation. Parts with significantly higher slew rates (BA3474FVJ-E2 at 10 V/µs) may require additional compensation to prevent oscillation in sensitive applications.

Q: What is the supply current difference between LP324MTX and LM224APT?

A: LP324MTX draws 85 µA total supply current, while LM224APT draws 1.5 mA (1500 µA). This 17.6× increase in supply current must be considered in power-budget-constrained applications. For battery-powered or low-power designs, LP324MTX/NOPB remains the preferred choice.

Q: Are there packaging format options for substitute parts?

A: Yes. Substitute parts are available in Cut Tape (CT) and Tape & Reel (TR) formats. Cut Tape is suitable for manual assembly and small-volume production; Tape & Reel is optimized for automated assembly processes. Selection depends on manufacturing process requirements.

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