LM324NSRG4 Equivalent & Substitute Parts

Part Overview

The LM324NSRG4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in a 14-SO surface mount package. This part is classified as Last Time Buy, indicating limited future availability from the original manufacturer. The device operates across a supply voltage range of 3V to 30V with a gain bandwidth product of 1.2 MHz and a slew rate of 0.5V/µs, making it suitable for general analog signal processing applications. Due to its Last Time Buy status, identifying equivalent and substitute parts is necessary for design continuity and long-term component sourcing strategy.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.5	V/µs
Gain Bandwidth Product	1.2	MHz
Current - Input Bias	20	nA
Voltage - Input Offset	3	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.209", 5.30mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM324NSRG4 is determined by the following critical parameters: 4-circuit general-purpose amplifier configuration, surface mount technology, 14-pin SOIC package format, supply voltage range compatibility (minimum 3V, maximum 30V or higher), and operating temperature range. Parts are grouped into two categories based on substitution feasibility:

Category 1: Direct Substitutes (Identical or Superior Electrical Performance) Parts in this category maintain the 4-circuit configuration, general-purpose amplifier type, and surface mount 14-SOIC package. These parts are compatible with the LM324NSRG4 footprint and electrical specifications, with supply voltage ranges that encompass or exceed the original part's 3V to 30V range.

Category 2: Functional Alternatives (Different Package Dimensions or Electrical Trade-offs) Parts in this category provide 4-circuit general-purpose amplifier functionality but may feature different package widths, altered electrical characteristics (such as reduced slew rate or bandwidth), or extended operating temperature ranges. These parts require board-level evaluation for mechanical fit and electrical performance alignment.

Parameter Comparison

Part Number	Manufacturer	Circuits	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Vcc Min (V)	Vcc Max (V)	Temp Range (°C)	Package Width	Status
LM324NSRG4	Texas Instruments	4	0.5	1.2	20	3	1.4	30	3	30	0 to 70	5.30mm	Last Time Buy
LM324NSR	Texas Instruments	4	0.5	1.2	20	3	1.4	30	3	30	0 to 70	5.30mm	Last Time Buy
LM324AM/NOPB	Texas Instruments	4	—	1	45	2	1.5	40	3	32	0 to 70	3.90mm	Active
LM324AMX/NOPB	Texas Instruments	4	—	1	45	2	1.5	40	3	32	0 to 70	3.90mm	Active
LM324M/NOPB	Texas Instruments	4	—	1	45	2	1.5	40	3	32	0 to 70	3.90mm	Active
LM324MX/NOPB	Texas Instruments	4	—	1	45	2	1.5	40	3	32	0 to 70	3.90mm	Active
LP324M/NOPB	Texas Instruments	4	0.05	0.1	2	2	0.085	10	3	32	0 to 70	3.90mm	Active
LP324MX/NOPB	Texas Instruments	4	0.05	0.1	2	2	0.085	10	3	32	0 to 70	3.90mm	Active
LM324DR	Rohm Semiconductor	4	0.3	1.2	20	1	1	30	3	32	-40 to 85	3.90mm	Obsolete
BA2902F-E2	Rohm Semiconductor	4	0.2	0.5	20	2	0.7	30	3	32	-40 to 125	4.40mm	Active
LM224ADT	STMicroelectronics	4	0.4	1.3	20	2	1.5	40	3	30	-40 to 105	3.90mm	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Footprint and Electrical Performance): The LM324NSR represents the closest equivalent to the LM324NSRG4, differing only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both parts share identical electrical specifications, supply voltage range, and operating temperature range. This part is suitable for applications requiring no board redesign. However, LM324NSR is also classified as Last Time Buy, limiting its long-term availability.

For Active Production Alternatives (Extended Availability): The LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB series from Texas Instruments are all classified as Active products, ensuring continued manufacturing and supply. These parts maintain the 4-circuit general-purpose amplifier configuration and supply voltage compatibility (3V to 32V). However, they feature a narrower package width (3.90mm versus 5.30mm), requiring PCB footprint verification. Electrical differences include reduced gain bandwidth product (1 MHz versus 1.2 MHz) and higher input bias current (45 nA versus 20 nA).

For Extended Temperature Range Applications: The LM224ADT from STMicroelectronics provides an operating temperature range of -40°C to 105°C, compared to the LM324NSRG4's 0°C to 70°C range. This part maintains comparable electrical performance (1.3 MHz gain bandwidth product, 0.4V/µs slew rate) and is classified as Active. Package width is 3.90mm, requiring footprint evaluation.

For Low-Power Applications: The LP324M/NOPB and LP324MX/NOPB variants offer significantly reduced supply current (85µA versus 1.4mA) and lower output current capability (10 mA versus 30 mA). These parts are suitable only for applications where reduced bandwidth (100 kHz versus 1.2 MHz) and slew rate (0.05V/µs versus 0.5V/µs) are acceptable trade-offs for power consumption reduction.

For Rohm Semiconductor Alternatives: The LM324DR is classified as Obsolete, limiting its suitability for new designs despite its extended temperature range (-40°C to 85°C). The BA2902F-E2 is an Active alternative offering extended temperature range (-40°C to 125°C) but with reduced slew rate (0.2V/µs) and gain bandwidth product (500 kHz). Package width is 4.40mm.

All recommended substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) status, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use LM324AM/NOPB as a direct replacement for LM324NSRG4 on my existing PCB?

A: The LM324AM/NOPB is electrically compatible but features a different package width (3.90mm versus 5.30mm). PCB footprint verification is required. If your board is designed for the 5.30mm width package, mechanical fit issues may occur. Electrical performance is comparable for most general-purpose applications, though the gain bandwidth product is reduced from 1.2 MHz to 1 MHz.

Q: What is the primary reason to substitute the LM324NSRG4?

A: The LM324NSRG4 is classified as Last Time Buy, indicating that Texas Instruments will discontinue production. Substitution is necessary to ensure long-term component availability and supply chain continuity. Active alternatives such as LM324AMX/NOPB provide equivalent functionality with guaranteed future availability.

Q: Are there any compliance or certification differences between the LM324NSRG4 and its substitutes?

A: All listed substitute parts maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited). Compliance certifications are consistent across all alternatives, with no restrictions on substitution from a regulatory standpoint.

Q: How does the LM224ADT differ from the LM324NSRG4 in terms of operating conditions?

A: The LM224ADT extends the operating temperature range to -40°C to 105°C, compared to the LM324NSRG4's 0°C to 70°C. The LM224ADT maintains comparable electrical performance (1.3 MHz gain bandwidth product versus 1.2 MHz) and is manufactured by STMicroelectronics. Package width is 3.90mm, requiring footprint verification.

Q: What are the trade-offs when using LP324M/NOPB or LP324MX/NOPB?

A: The LP324 series reduces supply current to 85µA (versus 1.4mA) and output current to 10 mA (versus 30 mA), making them suitable for battery-powered or ultra-low-power applications. However, the gain bandwidth product is reduced to 100 kHz and slew rate to 0.05V/µs. These parts are only suitable for applications where reduced bandwidth and slew rate are acceptable.

Q: Is the LM324DR from Rohm Semiconductor a viable substitute?

A: The LM324DR is classified as Obsolete, making it unsuitable for new designs or long-term sourcing. Although it offers extended temperature range (-40°C to 85°C) and comparable gain bandwidth product (1.2 MHz), its discontinued status creates supply risk. Active alternatives such as BA2902F-E2 are preferred.

Q: What packaging formats are available for LM324 equivalents?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Tube. The packaging format affects component handling and assembly processes but does not impact electrical performance. Selection should align with your procurement and assembly workflow requirements.

Q: Can I use BA2902F-E2 as a substitute if my application requires high-speed signal processing?

A: The BA2902F-E2 has a reduced gain bandwidth product (500 kHz versus 1.2 MHz) and slew rate (0.2V/µs versus 0.5V/µs). It is not suitable for applications requiring the full bandwidth and slew rate performance of the LM324NSRG4. Use this part only if your application bandwidth requirements are below 500 kHz.

Q: Are there any input bias current differences I should consider?

A: The LM324NSRG4 has an input bias current of 20 nA. The LM324AM/NOPB series increases this to 45 nA, while the LP324 series reduces it to 2 nA. For precision analog circuits sensitive to input bias current, the LP324 series offers superior performance. For general-purpose applications, the 45 nA specification of the LM324AM series is typically acceptable.

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