LP324MX General Purpose Operational Amplifier Equivalent & Substitute Parts

Part Overview

The LP324MX is a general purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as obsolete product status. The LP324MX operates across a supply voltage range of 3V to 32V with an operating temperature range of 0°C to 70°C. Due to its obsolete status, identification of equivalent and substitute parts is necessary for ongoing design support, production continuity, and component sourcing in applications requiring general purpose amplification.

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-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LP324MX is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Parameters:

Amplifier Type: General Purpose (4-circuit configuration required)
Supply Voltage Range: Minimum 3V, Maximum 32V
Number of Circuits: 4 channels
Input Offset Voltage: 2 mV maximum
Package Configuration: 14-pin SOIC or equivalent footprint

Mechanical Compatibility Parameters:

Mounting Type: Surface Mount
Package / Case: 14-SOIC (0.154", 3.90mm Width) or 14-SOP (0.173", 4.40mm Width)
Supplier Device Package: 14-SOIC or 14-SOP

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (Identical Electrical Performance): Parts maintaining the LP324MX electrical specifications including slew rate of 0.05V/µs and gain bandwidth product of 100 kHz. These parts are pin-compatible and functionally interchangeable without circuit modification.

Category 2 - Enhanced Performance Substitutes (Superior Electrical Performance): Parts with improved electrical characteristics including higher slew rates (0.2V/µs to 0.4V/µs), higher gain bandwidth products (500 kHz to 1.3 MHz), and higher output current capabilities (30 mA to 40 mA per channel). These parts maintain supply voltage compatibility and package footprint compatibility but offer enhanced performance margins.

Parameter Comparison

Parameter	LP324MX	LP324MX/NOPB	BA10324AF-E2	BA2902F-E2	LM124DT	LM224ADT	LM224DR2G	LM224DT	LM2902AWYDT	LM2902DR2G	LM2902DT
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor	Rohm Semiconductor	STMicroelectronics	STMicroelectronics	onsemi	STMicroelectronics	STMicroelectronics	onsemi	Rohm Semiconductor
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Slew Rate (V/µs)	0.05	0.05	0.2	0.2	0.4	0.4	—	0.4	0.4	—	0.3
Gain Bandwidth Product (kHz)	100	100	500	500	1300	1300	1000	1300	1300	1000	800
Current - Input Bias (nA)	2	2	20	20	20	20	90	20	20	90	20
Voltage - Input Offset (mV)	2	2	2	2	2	2	2	2	2	2	1
Current - Supply (µA)	85	85	600	700	1500	1500	—	1500	1500	—	1000
Current - Output / Channel (mA)	10	10	35	30	40	40	40	40	40	40	30
Voltage - Supply Span Min (V)	3	3	3	3	3	3	3	3	3	3	3
Voltage - Supply Span Max (V)	32	32	32	32	30	30	32	30	30	32	32
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 85	-40 to 125	-55 to 125	-40 to 105	-25 to 85	-40 to 105	-40 to 125	-40 to 105	-40 to 125
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.173", 4.40mm)	14-SOIC (0.173", 4.40mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The LP324MX/NOPB is the primary direct equivalent. This part maintains identical electrical specifications including 0.05V/µs slew rate, 100 kHz gain bandwidth product, and 85µA supply current. The LP324MX/NOPB is manufactured by Texas Instruments with active product status and ROHS3 compliance, providing superior long-term availability compared to the obsolete LP324MX. Packaging is identical at 14-SOIC (0.154", 3.90mm Width). This substitution requires no circuit modification and provides drop-in compatibility.

For Enhanced Performance Applications:

When circuit design permits utilization of enhanced electrical performance, the following parts provide superior specifications while maintaining supply voltage compatibility and package footprint compatibility:

LM224ADT and LM224DT (STMicroelectronics) offer 0.4V/µs slew rate and 1.3 MHz gain bandwidth product with 40 mA output current per channel. Operating temperature range extends to -40°C to 105°C. These parts are suitable for applications requiring faster signal processing and higher output drive capability.

LM2902DR2G (onsemi) provides 1 MHz gain bandwidth product with 40 mA output current per channel and active product status. Operating temperature range is -40°C to 105°C with ROHS3 compliance.

BA10324AF-E2 (Rohm Semiconductor) offers 0.2V/µs slew rate, 500 kHz gain bandwidth product, and 35 mA output current per channel with extended operating temperature range of -40°C to 85°C.

Compliance Considerations:

All recommended substitute parts maintain ROHS3 compliance, addressing environmental regulatory requirements. The LP324MX is RoHS non-compliant; substitution with ROHS3 compliant alternatives is necessary for new designs and applications subject to RoHS directives.

Product Status Considerations:

LP324MX/NOPB is the only substitute maintaining identical electrical performance with active product status. LM2902DT carries "Not For New Designs" status and should be avoided for new applications. All other recommended substitutes carry active product status, ensuring long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can LP324MX/NOPB be used as a direct replacement for LP324MX?

A: Yes. LP324MX/NOPB is a direct equivalent with identical electrical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). No circuit modification is required.

Q: What is the difference between 14-SOIC (0.154", 3.90mm Width) and 14-SOIC (0.173", 4.40mm Width) packages?

A: These are different physical package variants. The 0.154" width is the standard SOIC package; the 0.173" width is a wider variant. PCB footprints are not interchangeable. BA10324AF-E2 and BA2902F-E2 use the wider 0.173" package and require different PCB layout than the standard 0.154" package used by LP324MX.

Q: Can I use LM224ADT or LM224DT instead of LP324MX?

A: Yes, with design considerations. These parts maintain the same supply voltage range (3V to 32V) and package footprint (14-SOIC 0.154" width). However, they offer enhanced electrical performance: 0.4V/µs slew rate versus 0.05V/µs, and 1.3 MHz gain bandwidth product versus 100 kHz. These improvements are generally beneficial but may require circuit verification if the original design relied on the lower bandwidth characteristics.

Q: What is the significance of "Not For New Designs" status on LM2902DT?

A: Parts marked "Not For New Designs" indicate the manufacturer is transitioning away from this product. While functional equivalents exist, this status signals reduced manufacturing support and potential future discontinuation. New designs should select parts with active product status.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts carry ROHS3 compliance status. The original LP324MX is RoHS non-compliant. Substitution with ROHS3 compliant alternatives is necessary for applications subject to RoHS directives and for compliance with modern environmental regulations.

Q: What is the impact of higher supply current in substitute parts?

A: Substitute parts such as BA10324AF-E2 (600µA), BA2902F-E2 (700µA), and LM224ADT (1.5mA) consume more supply current than LP324MX (85µA). This increased consumption is associated with enhanced performance characteristics. Power supply design must accommodate the higher current draw. For battery-powered or low-power applications, this may be a limiting factor.

Q: Can I use LM2902AWYDT in automotive applications?

A: LM2902AWYDT carries automotive grade qualification (AEC-Q100) and is suitable for automotive applications. This part offers -40°C to 125°C operating temperature range and push-pull output configuration. Standard industrial-grade substitutes do not carry automotive qualification.

Q: What is the difference between output types listed as "—" and "Push-Pull"?

A: Output type "—" indicates standard open-collector or standard output configuration. "Push-Pull" indicates the amplifier output stage actively drives both high and low logic levels, providing improved output impedance characteristics and faster switching performance. LM2902AWYDT is the only substitute with push-pull output configuration.

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