LM324NSR Equivalent & Substitute Parts

Part Overview

The LM324NSR is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in a 14-SOIC surface mount package. This device operates across a supply voltage range of 3V to 30V and is designed for applications requiring low-power, general-purpose amplification. The LM324NSR is currently classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for ongoing production and maintenance applications.

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
Mounting Type	Surface Mount	—
Package / Case	14-SOIC (0.209", 5.30mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM324NSR is determined by the following critical parameters:

Functional Equivalence Criteria:

Number of circuits: 4 channels required
Amplifier type: General purpose configuration
Gain bandwidth product: 1.2 MHz (primary performance metric)
Supply voltage range: Minimum 3V, maximum 30V or higher
Operating temperature range: 0°C to 70°C or extended range
Mounting type: Surface mount
Package compatibility: 14-SOIC or equivalent footprint

Electrical Performance Boundaries:

Slew rate: 0.5 V/µs or greater
Input bias current: 20 nA or lower
Input offset voltage: 3 mV or lower
Output current per channel: 30 mA or greater
Supply current: 1.4 mA or lower

Substitute parts are grouped into two categories based on product status and performance characteristics:

Category 1: Active Production Alternatives — Parts with Active product status that meet or exceed the LM324NSR electrical specifications and maintain compatibility with the 14-SOIC package footprint.

Category 2: Obsolete Alternatives — Parts with Obsolete product status that provide functional equivalence but may have different package dimensions or extended operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
LM324NSR	Texas Instruments	Last Time Buy	0.5	1.2	20	3	1.4	30	0 to 70	14-SOIC (5.30mm)
LM324MX/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC (3.90mm)
LM324AMX/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC (3.90mm)
LM324M/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC (3.90mm)
LM324AM/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC (3.90mm)
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	2	0.085	10	0 to 70	14-SOIC (3.90mm)
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	2	0.085	10	0 to 70	14-SOIC (3.90mm)
LM324DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1	1	30	-40 to 85	14-SOIC (3.90mm)
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1	1	30	-40 to 125	14-SOIC (3.90mm)
BA2902F-E2	Rohm Semiconductor	Active	0.2	0.5	20	2	0.7	30	-40 to 125	14-SOIC (4.40mm)
LM124DT	STMicroelectronics	Active	0.4	1.3	20	2	1.5	40	-55 to 125	14-SOIC (3.90mm)

Engineering Selection Recommendations

Primary Recommendation: LM324MX/NOPB or LM324AMX/NOPB

Both LM324MX/NOPB and LM324AMX/NOPB are manufactured by Texas Instruments with Active product status. These parts maintain the same base product number (LM324) and provide direct functional equivalence. While the gain bandwidth product is reduced to 1 MHz (compared to 1.2 MHz in the LM324NSR), the output current capability is increased to 40 mA per channel. Both parts are ROHS3 compliant, MSL Level 1, and REACH unaffected. The primary consideration is package footprint: these parts use a 14-SOIC with 3.90mm width compared to the LM324NSR's 5.30mm width, requiring PCB layout verification.

Secondary Recommendation: LM124DT

The LM124DT, manufactured by STMicroelectronics, is an Active product offering extended operating temperature range (-55°C to 125°C) and superior gain bandwidth product (1.3 MHz). This part exceeds the LM324NSR performance in slew rate (0.4 V/µs) and output current (40 mA). The LM124DT is ROHS3 compliant and MSL Level 1. Package footprint is 14-SOIC (3.90mm width). The differential output type specification differs from the LM324NSR; verify application compatibility before selection.

Alternative for Low-Power Applications: LP324MX/NOPB

The LP324MX/NOPB is suitable only for applications where reduced bandwidth (100 kHz) and lower output current (10 mA) are acceptable. This part offers significantly lower supply current (85 µA) and input bias current (2 nA), making it appropriate for battery-powered or ultra-low-power designs. Product status is Active with ROHS3 compliance.

Obsolete Parts: LM324DR and LM2902DR

LM324DR and LM2902DR are classified as Obsolete and should not be selected for new designs. These parts are retained in the comparison for reference only in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q1: Can LM324MX/NOPB directly replace LM324NSR without PCB modification?

The LM324MX/NOPB uses a 14-SOIC package with 3.90mm width, while the LM324NSR uses 5.30mm width. Although both are 14-pin SOIC packages, the different body widths may require PCB footprint adjustment. Verify pad spacing and solder mask clearance before assembly. Pin configuration is identical.

Q2: What is the functional difference between LM324 and LM2902 base product numbers?

Both LM324 and LM2902 are general-purpose 4-circuit operational amplifiers with similar electrical characteristics. The LM2902 variants (such as LM2902DR) are listed as obsolete. For new designs, LM324-based parts are recommended due to active production status.

Q3: Why does LP324MX/NOPB have lower performance specifications?

The LP324MX/NOPB is a low-power variant of the LM324 family, optimized for reduced power consumption (85 µA supply current versus 1.4 mA). This optimization results in reduced gain bandwidth product (100 kHz) and output current capability (10 mA per channel). Selection depends on application requirements for speed and drive capability.

Q4: Is LM124DT suitable for all LM324NSR applications?

The LM124DT has differential output type specification, whereas the LM324NSR does not specify output type. Verify that your application circuit topology is compatible with differential output configuration. The LM124DT offers superior performance in gain bandwidth product (1.3 MHz) and extended temperature range (-55°C to 125°C).

Q5: What compliance certifications apply to all recommended substitutes?

All recommended active substitutes (LM324MX/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324AM/NOPB, LP324MX/NOPB, LP324M/NOPB, BA2902F-E2, and LM124DT) are ROHS3 compliant, MSL Level 1 (Unlimited moisture sensitivity), and REACH unaffected. ECCN classification is EAR99 for all parts.

Q6: Which substitute offers the best thermal performance?

LM124DT and BA2902F-E2 both support extended operating temperature ranges (-55°C to 125°C and -40°C to 125°C respectively), compared to the LM324NSR's 0°C to 70°C range. For applications requiring operation beyond 70°C, these parts are appropriate selections.

Q7: Are there package footprint compatibility issues between substitutes?

Yes. The LM324NSR uses 14-SOIC (5.30mm width), while most active substitutes use 14-SOIC (3.90mm width). BA2902F-E2 uses 14-SOIC (4.40mm width). Verify PCB pad layouts and solder mask clearances before selecting a substitute with different package dimensions.

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