LM324M Equivalent & Substitute Parts

Part Overview

The LM324M is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments under the LinCMOS™ series, this device operates across a wide supply voltage range of 3V to 32V with a gain bandwidth product of 1 MHz. The LM324M is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	-
Number of Circuits	4	-
Gain Bandwidth Product	1 MHz	-
Current - Input Bias	45 nA	-
Voltage - Input Offset	2 mV	-
Current - Supply	1.5 mA	-
Current - Output / Channel	40 mA	-
Voltage - Supply Span (Min)	3 V	-
Voltage - Supply Span (Max)	32 V	-
Operating Temperature	0°C ~ 70°C	-
Package / Case	14-SOIC (0.154", 3.90mm Width)	-
Mounting Type	Surface Mount	-
RoHS Status	RoHS non-compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the LM324M is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Number of circuits: 4 independent amplifier circuits
Package type: 14-SOIC surface mount configuration with 0.154" (3.90mm) width
Voltage supply range: Minimum 3V, maximum 32V or higher
Voltage input offset: 2 mV maximum
Current output per channel: 40 mA minimum
Gain bandwidth product: 1 MHz nominal
Input bias current: 45 nA nominal (tolerance range acceptable)

Acceptable Variations:

Current supply specifications may vary within operational limits
Operating temperature ranges may extend beyond the original 0°C to 70°C specification
Slew rate variations are acceptable provided gain bandwidth product remains compatible
RoHS compliance status may differ (original is non-compliant; substitutes may be compliant)
Packaging format (Tube, Cut Tape, Tape & Reel) does not affect electrical compatibility

Non-Substitutable Parameters:

Number of circuits must remain 4
Package case must remain 14-SOIC with compatible pin pitch
Supply voltage range must encompass the original 3V to 32V specification

Parameter Comparison

Part Number	Manufacturer	Circuits	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
LM324M	Texas Instruments	4	1	45	2	1.5	40	3	32	0 ~ 70	14-SOIC	Obsolete
LM324M/NOPB	Texas Instruments	4	1	45	2	1.5	40	3	32	0 ~ 70	14-SOIC	Active
LM324MX/NOPB	Texas Instruments	4	1	45	2	1.5	40	3	32	0 ~ 70	14-SOIC	Active
AS324AMTR-E1	Diodes Incorporated	4	1	20	2	1	40	3	36	-40 ~ 85	14-SOIC	Active
AS324AMTR-G1	Diodes Incorporated	4	1	20	2	1	40	3	36	-40 ~ 85	14-SOIC	Active
BA10324AF-E2	Rohm Semiconductor	4	0.5	20	2	0.6	35	3	32	-40 ~ 85	14-SOIC	Active
BA2902F-E2	Rohm Semiconductor	4	0.5	20	2	0.7	30	3	32	-40 ~ 125	14-SOIC	Active
BA2902SF-E2	Rohm Semiconductor	4	0.5	20	2	0.7	30	3	32	-40 ~ 105	14-SOIC	Active
LM124DT	STMicroelectronics	4	1.3	20	2	1.5	40	3	30	-55 ~ 125	14-SOIC	Active
LM224ADT	STMicroelectronics	4	1.3	20	2	1.5	40	3	30	-40 ~ 105	14-SOIC	Active
LM224DR2G	onsemi	4	1	90	2	-	40	3	32	-25 ~ 85	14-SOIC	Active

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical and Mechanical Specifications):

LM324M/NOPB and LM324MX/NOPB are direct equivalents to the obsolete LM324M. Both maintain identical electrical parameters including 1 MHz gain bandwidth product, 45 nA input bias current, 1.5 mA supply current, and 40 mA output current per channel. Both are manufactured by Texas Instruments and packaged in 14-SOIC configuration. LM324M/NOPB is classified as Active with RoHS3 compliance. LM324MX/NOPB is the manufacturer-recommended replacement, available in Cut Tape and Digi-Reel packaging with significantly higher inventory (50,513 units) and RoHS3 compliance.

Primary Substitute Candidates (Compatible Within Parameter Tolerances):

AS324AMTR-E1 and AS324AMTR-G1 (Diodes Incorporated) provide compatible substitution with improved specifications. Both feature lower input bias current (20 nA versus 45 nA), extended supply voltage range to 36V, and wider operating temperature range (-40°C to 85°C). Output current per channel remains at 40 mA. These parts are Active with RoHS3 compliance.

LM124DT and LM224ADT (STMicroelectronics) offer enhanced performance with 1.3 MHz gain bandwidth product and lower input bias current (20 nA). LM124DT operates across -55°C to 125°C, while LM224ADT operates -40°C to 105°C. Both maintain 40 mA output current and 1.5 mA supply current. Maximum supply voltage is 30V, which is within the original 32V specification tolerance.

Secondary Substitute Candidates (Reduced Performance Parameters):

BA10324AF-E2 and BA2902F-E2 (Rohm Semiconductor) feature reduced gain bandwidth product (0.5 MHz versus 1 MHz) and lower output current per channel (35 mA and 30 mA respectively). These parts are suitable only for applications where the reduced bandwidth and output current do not impact circuit performance. BA2902F-E2 offers extended temperature range to 125°C.

LM224DR2G (onsemi) maintains 1 MHz gain bandwidth product and 40 mA output current but exhibits higher input bias current (90 nA versus 45 nA) and narrower operating temperature range (-25°C to 85°C). This part is suitable for applications where input bias current variation is acceptable.

Compliance and Availability Considerations:

The original LM324M is RoHS non-compliant and obsolete. All recommended substitutes are RoHS3 compliant and Active. LM324MX/NOPB offers the highest inventory availability (50,513 units) and is the manufacturer-recommended direct replacement. All substitute parts maintain Moisture Sensitivity Level 1 (Unlimited) or Level 3 (168 Hours), ensuring compatibility with standard handling procedures.

Frequently Asked Questions (FAQ)

Q: Can LM324M/NOPB be used as a direct replacement for LM324M?

A: Yes. LM324M/NOPB is electrically and mechanically identical to LM324M. Both feature 4 circuits, 1 MHz gain bandwidth product, 45 nA input bias current, 2 mV input offset voltage, 1.5 mA supply current, and 40 mA output current per channel. The primary difference is product status: LM324M is obsolete while LM324M/NOPB is Active with RoHS3 compliance.

Q: What is the difference between LM324M/NOPB and LM324MX/NOPB?

A: Both are electrically identical direct equivalents. The difference is packaging format: LM324M/NOPB is supplied in Tube packaging, while LM324MX/NOPB is supplied in Cut Tape and Digi-Reel format. LM324MX/NOPB has significantly higher inventory availability (50,513 units versus 1,922 units) and is the manufacturer-recommended replacement.

Q: Can AS324AMTR-E1 replace LM324M in all applications?

A: AS324AMTR-E1 is compatible with LM324M for most general-purpose amplifier applications. Key differences are: lower input bias current (20 nA versus 45 nA), extended supply voltage range (36V maximum versus 32V), and wider operating temperature range (-40°C to 85°C versus 0°C to 70°C). These represent improvements over the original specification. Verify that the extended temperature range and lower input bias current do not conflict with circuit design requirements.

Q: Why do some substitutes have lower gain bandwidth product (0.5 MHz)?

A: BA10324AF-E2 and BA2902F-E2 feature 0.5 MHz gain bandwidth product compared to the original 1 MHz. These parts are suitable only for applications where bandwidth requirements do not exceed 0.5 MHz. For circuits requiring 1 MHz or higher bandwidth, select LM324MX/NOPB, AS324AMTR-E1, LM124DT, or LM224ADT.

Q: Is the 14-SOIC package compatible across all listed parts?

A: Yes. All listed parts use 14-SOIC surface mount packaging with 0.154" (3.90mm) width, ensuring mechanical compatibility. Pin pitch and footprint are identical. However, verify PCB layout accommodates the specific package width specification for each manufacturer, as some Rohm parts specify 0.173" (4.40mm) width.

Q: What is the significance of RoHS compliance for LM324M substitution?

A: The original LM324M is RoHS non-compliant. All recommended substitutes are RoHS3 compliant, meeting current environmental regulations for lead-free manufacturing. If your application or supply chain requires RoHS compliance, any of the listed substitutes are acceptable. If legacy RoHS non-compliant parts are required, only the original LM324M meets this criterion.

Q: Can LM224DR2G be used despite higher input bias current (90 nA)?

A: LM224DR2G is compatible with LM324M for applications where input bias current variation is acceptable. The 90 nA input bias current is approximately double the original 45 nA specification. This may impact precision analog circuits with high-impedance inputs. For precision applications, select AS324AMTR-E1, LM124DT, or LM224ADT, which feature 20 nA input bias current.

Q: What packaging formats are available for LM324MX/NOPB?

A: LM324MX/NOPB is available in Cut Tape (CT) and Digi-Reel format. This format is suitable for automated assembly and high-volume production. If Tube packaging is required, select LM324M/NOPB instead.

Q: Are there temperature range limitations when substituting LM324M?

A: The original LM324M operates 0°C to 70°C. Most substitutes extend this range: AS324AMTR-E1 operates -40°C to 85°C, LM124DT operates -55°C to 125°C, and LM224ADT operates -40°C to 105°C. If your application requires operation below 0°C or above 70°C, select a substitute with an extended temperature range. If operation is limited to 0°C to 70°C, all substitutes are acceptable.

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