LM324AN Equivalent & Substitute Parts

Part Overview

The LM324AN is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-pin DIP package. This device is classified as obsolete across multiple manufacturers, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The LM324AN operates across a wide supply voltage range (3V to 32V) and is suitable for applications requiring low-power, general-purpose amplification with moderate bandwidth characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1 MHz	MHz
Current - Input Bias	40 nA	nA
Voltage - Input Offset	1.5 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 to 70°C	°C
Mounting Type	Through Hole	—
Package / Case	14-DIP (0.300", 7.62mm)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM324AN is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Four independent amplifier circuits
Gain bandwidth product of 1 MHz or higher
Input bias current of 40 nA or lower
Input offset voltage of 2 mV or lower
Output current per channel of 30 mA or higher
Supply voltage range minimum of 3V and maximum of 30V or higher
Through-hole mounting in 14-DIP package configuration
Operating temperature range encompassing 0°C to 70°C

Substitution Categories:

Category 1: Direct Package Equivalents (14-DIP Through-Hole) Parts maintaining identical through-hole DIP packaging with compatible electrical specifications. These include LM324AN variants from different manufacturers and LM224-series devices with extended temperature ranges.

Category 2: Surface Mount Alternative (14-SOIC) The LM324ADR2G provides functional equivalence in surface-mount form factor. This substitution applies only to designs permitting package conversion from through-hole to surface-mount technology.

Parameter Comparison

Part Number	Manufacturer	Product Status	Gain Bandwidth (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Max (V)	Temp Range (°C)	Package	Mounting
LM324AN	onsemi	Obsolete	1	40	1.5	40	32	0 to 70	14-DIP	Through Hole
LM324AN	STMicroelectronics	Obsolete	1	20	2	40	30	0 to 70	14-DIP	Through Hole
LM324AN/NOPB	Texas Instruments	Active	1	45	2	40	32	0 to 70	14-DIP	Through Hole
LM324KAN	Texas Instruments	Active	1.2	15	2	30	30	0 to 70	14-DIP	Through Hole
LM324KN	Texas Instruments	Active	1.2	20	3	30	30	0 to 70	14-DIP	Through Hole
LM324N	Intersil	Obsolete	1	45	2	40	32	0 to 70	14-DIP	Through Hole
LM224AN	STMicroelectronics	Obsolete	1.3	20	2	30	30	-40 to 105	14-DIP	Through Hole
LM224KAN	Texas Instruments	Active	1.2	15	2	30	30	-25 to 85	14-DIP	Through Hole
LM224KN	Texas Instruments	Active	1.2	20	3	30	30	-25 to 85	14-DIP	Through Hole
LM224N	STMicroelectronics	Obsolete	1.3	20	2	40	30	-40 to 105	14-DIP	Through Hole
LM324ADR2G	onsemi	Active	1	40	2	40	32	0 to 70	14-SOIC	Surface Mount

Engineering Selection Recommendations

Active Product Status Preference

For new designs and production continuity, selection should prioritize components with active product status. The following parts maintain active status with full manufacturer support:

LM324AN/NOPB (Texas Instruments): Maintains identical electrical specifications to the original LM324AN with active product status. Suitable for direct replacement in through-hole applications.
LM324KAN and LM324KN (Texas Instruments): Enhanced performance variants with improved input bias current (15-20 nA) and higher gain bandwidth product (1.2 MHz). Compatible with 0°C to 70°C operating range.
LM224KAN and LM224KN (Texas Instruments): Extended temperature range variants (-25°C to 85°C) for applications requiring broader thermal operation.
LM324ADR2G (onsemi): Active status surface-mount alternative for designs permitting package conversion.

Compliance and Certification

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, consistent with the original LM324AN specifications. Moisture sensitivity level remains at MSL 1 (Unlimited) for through-hole variants.

Package Considerations

Through-hole 14-DIP mounting is preserved across all primary substitutes, ensuring mechanical compatibility with existing PCB layouts. Surface-mount conversion to 14-SOIC is available only through the LM324ADR2G, requiring PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the LM324AN be directly replaced with LM324AN/NOPB from Texas Instruments?

A: Yes. The LM324AN/NOPB maintains identical electrical specifications including 1 MHz gain bandwidth product, 40 mA output current per channel, and 3V to 32V supply range. Both operate across 0°C to 70°C. The primary difference is active product status, providing ongoing manufacturer support and availability.

Q: What is the difference between LM324 and LM224 series devices?

A: The LM224 series provides higher gain bandwidth product (1.2-1.3 MHz versus 1 MHz) and extended operating temperature ranges (-40°C to 105°C for STMicroelectronics variants, -25°C to 85°C for Texas Instruments variants). Output current per channel is reduced to 30 mA in LM224 devices. Both series contain four independent amplifier circuits and are compatible with 3V to 30V supply ranges.

Q: Is the LM324ADR2G a suitable substitute for through-hole applications?

A: The LM324ADR2G is electrically equivalent but uses 14-SOIC surface-mount packaging instead of 14-DIP through-hole. Substitution requires PCB redesign and is not suitable for existing through-hole layouts. This part is recommended only for new designs utilizing surface-mount technology.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: four independent amplifier circuits, gain bandwidth product of 1 MHz or higher, input bias current of 40 nA or lower, input offset voltage of 2 mV or lower, output current per channel of 30 mA or higher, and supply voltage range encompassing 3V minimum and 30V or higher maximum. Operating temperature range must include 0°C to 70°C.

Q: Are there inventory considerations for selecting between active and obsolete parts?

A: Obsolete parts including LM324AN (onsemi), LM324AN (STMicroelectronics), LM224AN, LM224N, and LM324N (Intersil) have substantial current inventory levels. However, obsolete status indicates no future manufacturing or support. Active parts such as LM324AN/NOPB, LM324KAN, LM324KN, LM224KAN, and LM224KN ensure long-term availability and design continuity.

Q: What is the significance of input bias current differences among substitutes?

A: Input bias current ranges from 15 nA (LM324KAN) to 45 nA (LM324AN/NOPB and LM324N). Lower input bias current reduces input offset current and improves performance in high-impedance circuits. Selection depends on application requirements; general-purpose applications tolerate the full range.

Q: Can LM224 devices operate within the original LM324AN temperature specification?

A: Yes. LM224 devices from both STMicroelectronics (-40°C to 105°C) and Texas Instruments (-25°C to 85°C) encompass the original 0°C to 70°C operating range. Extended temperature capability provides additional design margin without compromising compatibility.

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