LM324N Equivalent & Substitute Parts

Part Overview

The LM324N is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-pin DIP package. Manufactured by onsemi, this component operates across a supply voltage range of 3V to 32V with an operating temperature range of 0°C to 70°C. The LM324N is classified as an obsolete product, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. Equivalent parts maintain functional compatibility while substitute parts offer alternative electrical or packaging configurations suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Current - Input Bias	40	nA
Voltage - Input Offset	1.5	mV
Current - Supply	1	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	0 to 70	°C
Mounting Type	Through Hole	—
Package / Case	14-DIP (0.300", 7.62mm)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LM324N is determined by the following critical parameters: amplifier type (general purpose versus J-FET), number of circuits (4-channel configuration), supply voltage range compatibility (minimum 3V, maximum 32V or higher), output current capability (40 mA per channel), operating temperature range (0°C to 70°C), and package type (14-pin DIP for through-hole mounting).

Direct Equivalents maintain identical electrical specifications and 14-DIP through-hole packaging across different manufacturers. These parts are interchangeable without circuit modification.

Package Variants retain identical electrical performance but utilize surface-mount packaging (14-SOIC) instead of through-hole DIP, requiring PCB layout changes.

Functional Alternatives provide general-purpose amplification in 4-circuit configurations with compatible supply voltage ranges but may exhibit different input bias current, offset voltage, or slew rate characteristics. These parts are suitable when the application tolerates parameter variations within specified ranges.

Enhanced Performance Alternatives utilize J-FET input stages instead of standard CMOS inputs, offering significantly lower input bias current (pA range versus nA range) and higher slew rates, suitable for applications requiring improved input impedance or faster transient response.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Current - Input Bias (nA)	Voltage - Input Offset (mV)	Current - Supply (mA)	Current - Output / Channel (mA)	Voltage - Supply Min (V)	Voltage - Supply Max (V)	Operating Temp (°C)	Package / Case	Mounting Type	Product Status
LM324N	onsemi	General Purpose	4	40	1.5	1	40	3	32	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Obsolete
LM324DR2G	onsemi	General Purpose	4	90	2	—	40	3	32	0–70	14-SOIC (0.154", 3.90mm Width)	Surface Mount	Active
LM324AN	STMicroelectronics	General Purpose	4	20	2	1.5	40	3	30	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Obsolete
LM324N	Intersil	General Purpose	4	45	2	1.5	40	3	32	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Obsolete
LM324N/NOPB	Texas Instruments	General Purpose	4	45	2	1.5	40	3	32	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Active
LM324NE3	Texas Instruments	General Purpose	4	45	2	1.5	40	3	32	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Last Time Buy
LF347BN	onsemi	J-FET	4	0.05	3	7.2	40	36	36	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Obsolete
LF347N	STMicroelectronics	J-FET	4	0.02	3	1.4	40	44	44	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Obsolete
LF347N/NOPB	Texas Instruments	J-FET	4	0.05	5	7.2	40	36	36	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Active
LF444ACN/NOPB	Texas Instruments	J-FET	4	0.01	2	0.6	14	44	44	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Active
LF444CN/NOPB	Texas Instruments	J-FET	4	0.01	3	0.6	14	36	36	0–70	14-DIP (0.300", 7.62mm)	Through Hole	Active

Engineering Selection Recommendations

For Direct Replacement (Through-Hole DIP Package):

The LM324N/NOPB manufactured by Texas Instruments is the primary recommended equivalent. This part maintains identical electrical specifications, operates in the same supply voltage range (3V to 32V), and is currently in active production status. The NOPB designation indicates lead-free, RoHS3 compliant construction, meeting modern environmental and regulatory requirements.

The LM324NE3 from Texas Instruments provides an alternative with active product status and Last Time Buy availability. This variant exhibits identical core electrical parameters and packaging.

The LM324AN from STMicroelectronics offers through-hole DIP compatibility with RoHS3 compliance. This part exhibits lower input bias current (20 nA versus 40 nA) and operates within a maximum supply voltage of 30V, which is compatible with the LM324N's 32V maximum rating for most applications.

For Surface-Mount Applications:

The LM324DR2G from onsemi provides general-purpose amplification in a 14-SOIC surface-mount package with active product status. This part maintains the 3V to 32V supply voltage range and 40 mA output current per channel. The higher input bias current (90 nA) and input offset voltage (2 mV) remain within acceptable tolerances for general-purpose applications.

For Enhanced Input Impedance Requirements:

The LF347N/NOPB from Texas Instruments offers J-FET input architecture with significantly reduced input bias current (50 pA versus 40 nA), suitable for high-impedance signal sources. This part maintains 14-DIP through-hole packaging and active product status. The supply voltage requirement is fixed at ±18V (36V total span), which differs from the LM324N's flexible supply range.

The LF444CN/NOPB from Texas Instruments provides the lowest input bias current (10 pA) with the lowest supply current consumption (600 µA total). This part is suitable for ultra-low-power, high-impedance applications. Output current per channel is reduced to 14 mA, which may limit driving capability in some applications.

Compliance and Regulatory Status:

Parts designated with /NOPB suffix indicate lead-free, RoHS3 compliant construction. The LM324N/NOPB from Texas Instruments and LM324DR2G from onsemi meet current environmental compliance requirements. All recommended parts carry REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the LM324N/NOPB from Texas Instruments be used as a direct replacement for the onsemi LM324N?

A: Yes. Both parts maintain identical electrical specifications including 40 nA input bias current, 1.5 mV input offset voltage, 40 mA output current per channel, and 3V to 32V supply voltage range. Both utilize 14-DIP through-hole packaging. The primary difference is manufacturer and compliance status; the Texas Instruments variant is RoHS3 compliant and currently in active production.

Q: What is the difference between the LM324N and LM324DR2G?

A: The LM324DR2G is a surface-mount variant in 14-SOIC packaging, whereas the LM324N is through-hole 14-DIP. The LM324DR2G exhibits higher input bias current (90 nA versus 40 nA) and input offset voltage (2 mV versus 1.5 mV). Both maintain identical supply voltage range (3V to 32V) and output current capability (40 mA per channel). Surface-mount packaging requires PCB layout modifications.

Q: Can J-FET input amplifiers like the LF347N/NOPB replace the LM324N?

A: J-FET input amplifiers provide superior input impedance characteristics with input bias current in the picoampere range versus the LM324N's nanoampere range. However, the LF347N/NOPB requires a fixed ±18V supply voltage (36V total span), whereas the LM324N operates across 3V to 32V. The LF347N/NOPB is suitable only when the application requires high input impedance and can accommodate the fixed supply voltage requirement.

Q: What is the significance of the /NOPB suffix on part numbers?

A: The /NOPB designation indicates lead-free, RoHS3 compliant construction. These parts meet current environmental regulations and are suitable for applications requiring compliance with modern electronic waste directives. Parts without this designation may contain lead and may not meet current regulatory requirements.

Q: How does the LM324AN from STMicroelectronics compare to the onsemi LM324N?

A: The LM324AN maintains 14-DIP through-hole packaging and general-purpose amplifier configuration. It exhibits lower input bias current (20 nA versus 40 nA) and identical input offset voltage (2 mV). The maximum supply voltage is 30V versus 32V for the onsemi part. Both are classified as obsolete products. The LM324AN is RoHS3 compliant.

Q: Are there any supply voltage compatibility issues when substituting the LM324N?

A: The LM324N operates across 3V to 32V. The LM324AN operates across 3V to 30V, which is compatible for applications not exceeding 30V. J-FET alternatives like the LF347N/NOPB require fixed ±18V supplies and are not compatible with the LM324N's flexible supply range. Verify application supply voltage requirements before substitution.

Q: What output current limitations should be considered?

A: The LM324N provides 40 mA output current per channel. The LF444CN/NOPB provides only 14 mA per channel. Applications requiring output currents exceeding 14 mA must use parts rated for 40 mA output current, such as the LM324N/NOPB or LM324DR2G.

Q: Is the LM324NE3 suitable for new designs?

A: The LM324NE3 is classified as Last Time Buy, indicating limited remaining inventory and imminent discontinuation. While currently available, this part is not recommended for new designs. The LM324N/NOPB from Texas Instruments is the preferred choice for new applications due to active production status and RoHS3 compliance.

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