LP324M Equivalent & Substitute Parts Reference

Part Overview

The LP324M 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 and operates across a supply voltage range of 3V to 32V with a slew rate of 0.05V/µs and gain bandwidth product of 100 kHz. Due to its obsolete product status, equivalent and substitute parts with active availability and improved electrical characteristics are necessary for new designs and 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-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LP324M is determined by the following critical parameters: amplifier type (general purpose), number of circuits (4), package type (14-SOIC surface mount), supply voltage range compatibility (minimum 3V, maximum 30V or higher), and operating temperature range. Substitute parts must maintain the same pinout and circuit configuration to ensure direct replacement without PCB redesign.

The substitute parts are grouped into two categories:

Category 1: Direct Package Equivalent (14-SOIC) Parts that maintain identical or superior electrical performance within the same 14-SOIC package footprint, enabling direct PCB substitution.

Category 2: Functional Equivalent with Enhanced Performance Parts that provide improved electrical characteristics (higher slew rate, higher gain bandwidth product, higher output current) while maintaining package compatibility and supply voltage range overlap.

Key parameters determining substitution eligibility:

Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Number of Circuits: 4
Voltage - Supply Span (Min): 3V minimum
Voltage - Supply Span (Max): 30V or higher
Amplifier Type: General Purpose

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Supply Current (µA)	Output Current (mA)	Temp Range (°C)	RoHS Status
LP324M	Texas Instruments	Obsolete	0.05	100	2	85	10	0 to 70	Non-compliant
LP324M/NOPB	Texas Instruments	Active	0.05	100	2	85	10	0 to 70	ROHS3 Compliant
LM124D	STMicroelectronics	Obsolete	0.4	1200	20	1500	30	-55 to 125	ROHS3 Compliant
LM124DR	Texas Instruments	Active	0.5	1200	20	1400	30	-55 to 125	ROHS3 Compliant
LM124DRG4	Texas Instruments	Discontinued at DiGi Electronics	0.5	1200	20	1400	30	-55 to 125	ROHS3 Compliant
LM224AD	STMicroelectronics	Obsolete	0.4	1200	20	1500	30	-40 to 105	ROHS3 Compliant
LM224ADR	Texas Instruments	Active	0.5	1200	15	1400	30	-25 to 85	ROHS3 Compliant
LM224ADRG4	Texas Instruments	Obsolete	0.5	1200	15	1400	30	-25 to 85	ROHS3 Compliant
LM224D	STMicroelectronics	Active	0.4	1200	20	1500	40	-40 to 105	ROHS3 Compliant
LM224DR	UMW	Active	0.5	1200	20	700	30	-20 to 85	ROHS3 Compliant
LM224KAD	Texas Instruments	Last Time Buy	0.5	1200	15	1400	30	-25 to 85	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Minimum Design Change):

LP324M/NOPB is the primary equivalent. This part maintains identical electrical specifications to the original LP324M while offering active product status and ROHS3 compliance. The /NOPB suffix indicates lead-free, RoHS-compliant packaging. Current inventory is 2000 pieces. This selection eliminates obsolescence risk without requiring circuit redesign.

For Enhanced Performance Applications:

LM124DR and LM224ADR provide superior electrical performance with 12× higher gain bandwidth product (1200 kHz vs. 100 kHz), 10× higher slew rate (0.5 V/µs vs. 0.05 V/µs), and 3× higher output current capability (30 mA vs. 10 mA). Both parts are active products with ROHS3 compliance. LM124DR supports extended temperature operation (-55°C to 125°C), while LM224ADR operates across -25°C to 85°C. These parts are suitable for applications requiring faster transient response and higher drive capability.

For Cost-Optimized Production:

LM224DR (UMW manufacturer) offers the lowest supply current specification (700 µA vs. 1400-1500 µA) among active alternatives, reducing power consumption in battery-powered or low-power applications. This part maintains 1200 kHz gain bandwidth product and 0.5 V/µs slew rate with active product status and ROHS3 compliance. Inventory availability is 105,100 pieces.

Compliance Considerations:

All recommended substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements. The original LP324M is RoHS non-compliant; migration to compliant alternatives is necessary for new designs and procurement policies requiring RoHS certification.

Frequently Asked Questions (FAQ)

Q: Can LP324M/NOPB be used as a direct drop-in replacement for LP324M?

A: Yes. LP324M/NOPB maintains identical electrical specifications, pinout, and 14-SOIC package footprint. The only differences are active product status and ROHS3 compliance. No circuit modifications are required.

Q: What are the main differences between LP324M and LM124DR?

A: LM124DR provides significantly enhanced performance: 12× higher gain bandwidth product (1200 kHz vs. 100 kHz), 10× higher slew rate (0.5 V/µs vs. 0.05 V/µs), and 3× higher output current per channel (30 mA vs. 10 mA). Both use 14-SOIC packaging and 4-circuit configuration. LM124DR supports wider temperature range (-55°C to 125°C vs. 0°C to 70°C). These improvements may require circuit validation in applications with tight bandwidth or slew rate specifications.

Q: Is the 14-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use 14-SOIC (0.154", 3.90mm Width) surface mount packaging with identical pinout. PCB footprints are interchangeable. Some manufacturers designate the package as 14-SO or 14-SOP, but these refer to the same physical package specification.

Q: Which substitute part has the lowest power consumption?

A: LM224DR (UMW) specifies 700 µA supply current, the lowest among active alternatives. This represents approximately 50% reduction compared to other LM224 and LM124 variants (1400-1500 µA). This part is suitable for battery-powered or energy-constrained applications.

Q: Can I use LM224ADR in applications requiring -55°C to 125°C operation?

A: No. LM224ADR operates across -25°C to 85°C. For extended temperature range (-55°C to 125°C), use LM124DR or LM124DRG4, both rated for this specification.

Q: What is the difference between LM124DR and LM124DRG4?

A: Both parts are electrically identical with 14-SOIC packaging, 1200 kHz gain bandwidth product, and 0.5 V/µs slew rate. LM124DRG4 is discontinued at DiGi Electronics with 5600 pieces inventory, while LM124DR is active with 171,766 pieces available. For new designs, LM124DR is recommended due to active status and higher availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. The original LP324M is RoHS non-compliant. Migration to compliant alternatives is necessary for procurement policies and regulatory requirements.

Q: Can LM224D be used as a substitute despite being manufactured by STMicroelectronics?

A: Yes. LM224D is active with ROHS3 compliance, 14-SOIC packaging, and 1200 kHz gain bandwidth product. It specifies 40 mA output current per channel (highest among alternatives) and operates across -40°C to 105°C. Manufacturer diversity provides supply chain flexibility.

Q: What is the significance of the /NOPB suffix on LP324M/NOPB?

A: The /NOPB suffix indicates "No Lead, Pb-free" packaging, confirming RoHS compliance and lead-free solder compatibility. This is standard for modern electronic components and required for most procurement specifications.

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