LM324NSRE4 Equivalent & Substitute Parts

Part Overview

The LM324NSRE4 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. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and accommodate evolving component availability in the market.

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 LM324NSRE4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 4 (mandatory)
Amplifier type: General Purpose (mandatory)
Supply voltage range: Minimum 3V, Maximum ≥30V
Gain bandwidth product: 1.2 MHz or compatible
Slew rate: 0.5V/µs or compatible
Current output per channel: ≥30 mA
Input bias current: ≤20 nA
Input offset voltage: ≤3 mV
Surface mount packaging
RoHS3 compliance
MSL rating: 1 (Unlimited)

Package Compatibility: The LM324NSRE4 uses a 14-SOIC package with 0.209" width (5.30mm). Substitute parts may use alternative 14-pin SOIC variants (0.154" width at 3.90mm) provided they maintain electrical equivalence and surface mount compatibility.

Substitution Logic: Parts are grouped into two categories based on operational characteristics and availability status:

Direct Electrical Equivalents – Parts maintaining identical or superior electrical specifications with active product status
Functional Equivalents – Parts with compatible electrical performance but different packaging or temperature ratings, suitable for applications where the original specifications exceed requirements

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Span (V)	Temp Range (°C)	Package	Status
LM324NSRE4	Texas Instruments	0.5	1.2	20	3	1.4	30	3–30	0–70	14-SOIC (5.30mm)	Last Time Buy
LM324NSR	Texas Instruments	0.5	1.2	20	3	1.4	30	3–30	0–70	14-SOIC (5.30mm)	Last Time Buy
LM324AM/NOPB	Texas Instruments	—	1	45	2	1.5	40	3–32	0–70	14-SOIC (3.90mm)	Active
LM324AMX/NOPB	Texas Instruments	—	1	45	2	1.5	40	3–32	0–70	14-SOIC (3.90mm)	Active
LM324M/NOPB	Texas Instruments	—	1	45	2	1.5	40	3–32	0–70	14-SOIC (3.90mm)	Active
LM324MX/NOPB	Texas Instruments	—	1	45	2	1.5	40	3–32	0–70	14-SOIC (3.90mm)	Active
LP324M/NOPB	Texas Instruments	0.05	0.1	2	2	0.085	10	3–32	0–70	14-SOIC (3.90mm)	Active
LP324MX/NOPB	Texas Instruments	0.05	0.1	2	2	0.085	10	3–32	0–70	14-SOIC (3.90mm)	Active
LM324DR	Rohm Semiconductor	0.3	1.2	20	1	1	30	3–32	−40–85	14-SOIC (3.90mm)	Obsolete
BA2902F-E2	Rohm Semiconductor	0.2	0.5	20	2	0.7	30	3–32	−40–125	14-SOIC (4.40mm)	Active
LM224ADT	STMicroelectronics	0.4	1.3	20	2	1.5	40	3–30	−40–105	14-SOIC (3.90mm)	Active

Engineering Selection Recommendations

Tier 1 – Recommended Direct Substitutes (Active Status, Highest Compatibility):

LM324NSR (Texas Instruments) – Identical electrical specifications to the LM324NSRE4 with matching slew rate (0.5V/µs), gain bandwidth product (1.2 MHz), and supply voltage range (3–30V). Packaging differs only in reel format (Cut Tape & Digi-Reel® vs. Tape & Reel). RoHS3 compliant with MSL 1 rating. Recommended for direct replacement in new designs and production continuity.

LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB (Texas Instruments, LinCMOS™ Series) – Active product status with extended supply voltage range (3–32V). Gain bandwidth product reduced to 1 MHz; however, input offset voltage improved to 2 mV and output current increased to 40 mA per channel. Package uses 14-SOIC (3.90mm width). Suitable for applications where the original slew rate specification is not critical and improved output drive capability is beneficial. RoHS3 compliant with MSL 1 rating.

LM224ADT (STMicroelectronics) – Active product with gain bandwidth product of 1.3 MHz (exceeds original 1.2 MHz specification) and slew rate of 0.4V/µs. Supply voltage range maintained at 3–30V. Extended operating temperature range (−40°C to 105°C) provides thermal margin beyond the original 0–70°C specification. Output current increased to 40 mA per channel. RoHS3 compliant with MSL 1 rating. Suitable for applications requiring extended temperature performance.

Tier 2 – Functional Equivalents (Active Status, Application-Dependent):

LP324M/NOPB, LP324MX/NOPB (Texas Instruments) – Active product with significantly reduced power consumption (85µA supply current vs. 1.4mA) and lower output current capability (10 mA vs. 30 mA). Gain bandwidth product reduced to 100 kHz; slew rate reduced to 0.05V/µs. Suitable only for low-speed, low-power applications where the original performance specifications exceed requirements. RoHS3 compliant with MSL 1 rating.

BA2902F-E2 (Rohm Semiconductor) – Active product with reduced slew rate (0.2V/µs) and gain bandwidth product (500 kHz). Supply current reduced to 700µA. Extended operating temperature range (−40°C to 125°C). Suitable for low-speed applications with thermal margin requirements. RoHS3 compliant with MSL 1 rating.

Tier 3 – Not Recommended (Obsolete Status):

LM324DR (Rohm Semiconductor) – Obsolete product status. Although electrical specifications are compatible (1.2 MHz GBW, 20 nA input bias, 30 mA output current), the obsolete classification indicates discontinued manufacturing and limited future availability. Use only when no active alternatives are available and supply chain risk is acceptable.

Compliance and Certification: All recommended substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly processes and long-term storage requirements.

Frequently Asked Questions (FAQ)

Q1: Can LM324AM/NOPB or LM324AMX/NOPB be used as direct replacements for LM324NSRE4?

A: Yes, with design verification. Both parts are electrically compatible general-purpose 4-circuit operational amplifiers with identical supply voltage range (3–32V, exceeding the original 3–30V). The primary differences are reduced gain bandwidth product (1 MHz vs. 1.2 MHz) and improved input offset voltage (2 mV vs. 3 mV). The package footprint differs (14-SOIC 3.90mm width vs. 5.30mm width), requiring PCB layout adjustment. Both parts are Active status with RoHS3 compliance. Suitable for applications where the 1 MHz bandwidth is sufficient.

Q2: What is the significance of the package width difference (5.30mm vs. 3.90mm)?

A: The LM324NSRE4 uses a 14-SOIC package with 0.209" width (5.30mm), while most substitute parts use 14-SOIC with 0.154" width (3.90mm). This difference affects PCB footprint, pad spacing, and component placement. The narrower 3.90mm package is more compact and represents current manufacturing standards. PCB redesign is required for mechanical compatibility; however, electrical pin assignments remain identical. Verify PCB layout and assembly equipment compatibility before implementation.

Q3: Why is LM324NSR recommended over LM324NSRE4 if both are Last Time Buy status?

A: LM324NSR offers identical electrical specifications (0.5V/µs slew rate, 1.2 MHz GBW, 3–30V supply range) with higher inventory availability (17,013 pcs vs. 1,165 pcs). Both parts are Last Time Buy, indicating limited future production; however, LM324NSR provides greater near-term supply security. For long-term design continuity, transition to Active status parts such as LM324AM/NOPB or LM224ADT is recommended.

Q4: Is LM224ADT suitable for applications requiring the original 0–70°C temperature range?

A: Yes. LM224ADT operates across −40°C to 105°C, which encompasses and exceeds the original 0–70°C specification. The extended temperature range provides additional thermal margin and is suitable for applications with variable environmental conditions. Electrical specifications (1.3 MHz GBW, 0.4V/µs slew rate, 3–30V supply) are compatible with the original design. RoHS3 compliant with MSL 1 rating.

Q5: Can LP324M/NOPB or LP324MX/NOPB replace LM324NSRE4 in existing designs?

A: No, not without significant circuit redesign. LP324 variants are low-power, low-speed devices with 100 kHz gain bandwidth product and 0.05V/µs slew rate, compared to the original 1.2 MHz and 0.5V/µs. Output current capability is reduced to 10 mA per channel (vs. 30 mA). These parts are suitable only for applications where the original performance specifications substantially exceed requirements and power consumption reduction is a primary design objective. Use only with full circuit analysis and performance verification.

Q6: What is the product status significance for component selection?

A: Product status indicates manufacturing lifecycle and future availability. Active status parts (LM324AM/NOPB, LM224ADT, BA2902F-E2, LP324M/NOPB) are currently manufactured and available for indefinite future procurement, making them suitable for new designs and long-term production. Last Time Buy status (LM324NSRE4, LM324NSR) indicates limited future production with defined end-of-life dates; these parts are suitable only for existing designs requiring continuity. Obsolete status (LM324DR) indicates discontinued manufacturing; use only when no active alternatives are available and supply chain risk is acceptable.

Q7: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts listed in this document maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly processes, lead-free soldering, and long-term storage without special handling requirements.

Q8: Which substitute part offers the best performance improvement over LM324NSRE4?

A: LM224ADT (STMicroelectronics) provides the most comprehensive performance improvement: gain bandwidth product increased to 1.3 MHz (vs. 1.2 MHz), output current increased to 40 mA per channel (vs. 30 mA), and extended operating temperature range (−40°C to 105°C vs. 0–70°C). Slew rate is slightly reduced (0.4V/µs vs. 0.5V/µs), which is negligible for most general-purpose applications. Active product status ensures long-term availability. Recommended for new designs requiring enhanced performance and thermal margin.

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