LM324AM Equivalent & Substitute Parts

Part Overview

The LM324AM is a general-purpose operational amplifier manufactured by Texas Instruments, featuring four independent circuits in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range of 3V to 32V and is designed for applications requiring low-power, general-purpose amplification. The LM324AM carries an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers including Diodes Incorporated, Analog Devices, Rohm Semiconductor, and STMicroelectronics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1 MHz	MHz
Current - Input Bias	45 nA	nA
Voltage - Input Offset	2 mV	mV
Current - Supply	1.5 mA	mA
Current - Output / Channel	40 mA	mA
Voltage - Supply Span (Min)	3 V	V
Voltage - Supply Span (Max)	32 V	V
Operating Temperature	0°C ~ 70°C	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LM324AM are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Compatibility Parameters:

Amplifier Type: General Purpose (required for functional equivalence)
Number of Circuits: 4 (required for pin-count compatibility)
Package / Case: 14-SOIC form factor (required for PCB layout compatibility)
Mounting Type: Surface Mount (required for assembly process compatibility)
Voltage - Supply Span: Minimum 3V to Maximum ≥32V (required for power supply compatibility)
Current - Output / Channel: ≥40 mA (required for load-driving capability)

Acceptable Parameter Variations:

Current - Input Bias: Values ≤45 nA are acceptable (lower bias current is beneficial)
Voltage - Input Offset: Values ≤2 mV are acceptable (lower offset improves precision)
Current - Supply: Values ≤1.5 mA per channel are preferred (lower consumption is beneficial)
Operating Temperature: Extended ranges are acceptable (wider operating range is beneficial)
Gain Bandwidth Product: Values ≥1 MHz are acceptable (higher bandwidth is beneficial)

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications with active product status) and Functional Alternatives (compatible electrical specifications with enhanced performance characteristics or extended operating ranges).

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Number of Circuits	Gain Bandwidth Product (MHz)	Current - Input Bias (nA)	Voltage - Input Offset (mV)	Current - Supply (mA)	Current - Output / Channel (mA)	Voltage - Supply Min (V)	Voltage - Supply Max (V)	Operating Temperature (°C)	Package
LM324AM	Texas Instruments	Obsolete	General Purpose	4	1	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	General Purpose	4	1	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	General Purpose	4	1	45	2	1.5	40	3	32	0 ~ 70	14-SOIC
AS324AMTR-E1	Diodes Incorporated	Active	General Purpose	4	1	20	2	1	40	3	36	-40 ~ 85	14-SOIC
AS324AMTR-G1	Diodes Incorporated	Active	General Purpose	4	1	20	2	1	40	3	36	-40 ~ 85	14-SO
BA10324AF-E2	Rohm Semiconductor	Active	General Purpose	4	0.5	20	2	0.6	35	3	32	-40 ~ 85	14-SOP
BA2902F-E2	Rohm Semiconductor	Active	General Purpose	4	0.5	20	2	0.7	30	3	32	-40 ~ 125	14-SOP
BA2902SF-E2	Rohm Semiconductor	Active	General Purpose	4	0.5	20	2	0.7	30	3	32	-40 ~ 105	14-SOP
LM224ADT	STMicroelectronics	Active	General Purpose	4	1.3	20	2	1.5	40	3	30	-40 ~ 105	14-SO
LM124DT	STMicroelectronics	Active	General Purpose	4	1.3	20	2	1.5	40	3	30	-55 ~ 125	14-SO
ADA4000-4ARZ	Analog Devices Inc.	Active	J-FET	4	5	0.005	0.2	1.35	28	8	36	-40 ~ 125	14-SOIC

Engineering Selection Recommendations

Direct Equivalent Selection (Recommended for Pin-Compatible Replacement):

For applications requiring direct functional replacement of the obsolete LM324AM, select LM324AM/NOPB or LM324AMX/NOPB from Texas Instruments. Both parts maintain identical electrical specifications (1 MHz gain bandwidth product, 45 nA input bias current, 2 mV input offset voltage, 40 mA output current per channel) and operate across the same 3V to 32V supply range. Both parts carry Active product status and ROHS3 compliance. The primary difference is packaging format: LM324AM/NOPB is supplied in Tube packaging, while LM324AMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format. Selection between these two depends on procurement and assembly requirements.

Enhanced Performance Alternatives (For New Designs or Performance Optimization):

The AS324AMTR-E1 and AS324AMTR-G1 from Diodes Incorporated provide improved electrical characteristics while maintaining 14-SOIC package compatibility. These parts feature reduced input bias current (20 nA versus 45 nA), lower supply current (1 mA versus 1.5 mA), and extended maximum supply voltage (36V versus 32V). Operating temperature range extends to -40°C to 85°C. Both parts are Active status with ROHS3 compliance.

The LM224ADT from STMicroelectronics offers enhanced gain bandwidth product (1.3 MHz versus 1 MHz) and extended operating temperature range (-40°C to 105°C) while maintaining 40 mA output current per channel and 3V to 30V supply range. This part is suitable for applications requiring improved frequency response.

The LM124DT from STMicroelectronics provides the widest operating temperature range (-55°C to 125°C) with 1.3 MHz gain bandwidth product, making it suitable for military-grade or extreme-environment applications.

Specialized Application Alternative:

The ADA4000-4ARZ from Analog Devices represents a performance-enhanced alternative with J-FET input architecture. This part features significantly lower input bias current (5 pA versus 45 nA), lower input offset voltage (200 µV versus 2 mV), and higher gain bandwidth product (5 MHz versus 1 MHz). However, the minimum supply voltage is 8V (versus 3V for LM324AM), and output current per channel is reduced to 28 mA. This part is suitable only for applications with ≥8V supply availability and where ultra-low input bias current is required.

Compliance and Certification:

All recommended substitute parts carry ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original LM324AM specifications. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can LM324AM/NOPB be used as a direct replacement for LM324AM?

A: Yes. LM324AM/NOPB is electrically and mechanically identical to LM324AM, with the primary difference being Active product status versus Obsolete status. Both parts feature identical electrical specifications, 14-SOIC package, and operating parameters. The /NOPB designation indicates lead-free (Pb-free) compliance. This is the recommended direct replacement.

Q: What is the difference between LM324AM/NOPB and LM324AMX/NOPB?

A: Both parts are electrically identical with identical specifications. The difference is packaging format: LM324AM/NOPB is supplied in Tube packaging, while LM324AMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on procurement method and assembly line requirements. Cut Tape format is typically preferred for automated assembly processes.

Q: Can AS324AMTR-E1 replace LM324AM in existing designs?

A: Yes, with design verification. AS324AMTR-E1 is pin-compatible and package-compatible (14-SOIC). Electrical improvements include lower input bias current (20 nA versus 45 nA), lower supply current (1 mA versus 1.5 mA), and extended maximum supply voltage (36V versus 32V). Operating temperature range is -40°C to 85°C versus 0°C to 70°C. These improvements are beneficial for most applications. However, designs operating below 0°C or above 70°C require verification.

Q: What is the difference between 14-SOIC, 14-SO, and 14-SOP packages?

A: These are variations of 14-pin surface-mount packages with different body widths. 14-SOIC (0.154" width, 3.90mm) is the standard narrow body. 14-SO and 14-SOP are wider body variants (0.173" width, 4.40mm). While pin pitch and functionality are identical, PCB layout and footprint dimensions differ. Verify PCB footprint compatibility before substituting between these package types.

Q: Is ADA4000-4ARZ suitable as a replacement for LM324AM?

A: ADA4000-4ARZ is functionally compatible but not a direct replacement. Key differences: (1) Minimum supply voltage is 8V versus 3V—designs operating below 8V cannot use this part; (2) Output current per channel is 28 mA versus 40 mA—designs requiring >28 mA output current cannot use this part; (3) Amplifier type is J-FET versus General Purpose, providing ultra-low input bias current (5 pA) and lower input offset voltage (200 µV). This part is suitable only for applications with ≥8V supply, ≤28 mA output current requirements, and where ultra-low input bias current provides design benefit.

Q: What is the significance of the operating temperature range difference?

A: The LM324AM operates 0°C to 70°C. Substitute parts offer extended ranges: AS324AMTR-E1 operates -40°C to 85°C; LM224ADT operates -40°C to 105°C; LM124DT operates -55°C to 125°C. Extended temperature ranges are beneficial for applications in industrial, automotive, or military environments. However, designs operating within the original 0°C to 70°C range do not require extended temperature parts. Selection should match actual application temperature requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance, matching the original LM324AM. All parts also carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: What inventory considerations apply to these substitute parts?

A: Current inventory levels vary significantly. LM324AMX/NOPB has the highest inventory (36,756 pcs), followed by BA10324AF-E2 (67,700 pcs) and LM224ADT (34,870 pcs). AS324AMTR-G1 has limited inventory (1,979 pcs). For high-volume procurement, verify current inventory with suppliers before design finalization.

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