LM324ADR2 Equivalent & Substitute Parts

Part Overview

The LM324ADR2 is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a quad amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The LM324ADR2 operates across a supply voltage range of 3 V to 32 V with a gain bandwidth product of 1 MHz and is suitable for applications requiring low-power, general-purpose amplification with four independent circuits on a single die.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM324ADR2
Manufacturer	onsemi
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Gain Bandwidth Product	1 MHz
Current - Input Bias	40 nA
Voltage - Input Offset	2 mV
Current - Supply	1.5 mA (x4 Channels)
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	3 V
Voltage - Supply Span (Max)	32 V
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM324ADR2 is determined by the following critical parameters: amplifier type (general purpose), number of circuits (4), package type (14-SOIC surface mount), and electrical operating ranges (supply voltage, input bias current, input offset voltage, output current capability, and gain bandwidth product). Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Equivalents: Parts that maintain identical or near-identical electrical specifications and package configuration, differing primarily in manufacturer or product status. These include the LM324ADR2G (onsemi, active status) and LM324AD (STMicroelectronics).

Upgraded Alternatives: Parts that share the same base product number and package but offer extended operating temperature ranges or improved electrical performance. The LM224ADT represents this category with an extended temperature range of -40°C to 105°C.

Similar Performance Alternatives: Parts that differ in amplifier type (J-FET or enhanced general-purpose designs) but maintain the same package configuration and quad-circuit topology. These include the AD8684ARZ series and ADA4000/ADA4004 series from Analog Devices Inc., which offer superior performance characteristics such as higher slew rates, lower input bias currents, and extended temperature ranges.

Parameter Comparison

Parameter	LM324ADR2	LM324ADR2G	LM324AD	LM224ADT	AD8684ARZ	ADA4000-4ARZ	ADA4004-4ARZ
Manufacturer	onsemi	onsemi	STMicroelectronics	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	J-FET	J-FET	General Purpose
Number of Circuits	4	4	4	4	4	4	4
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Gain Bandwidth Product	1 MHz	1 MHz	1.3 MHz	1.3 MHz	3.5 MHz	5 MHz	12 MHz
Current - Input Bias	40 nA	40 nA	20 nA	20 nA	6 pA	5 pA	40 nA
Voltage - Input Offset	2 mV	2 mV	2 mV	2 mV	350 µV	200 µV	40 µV
Current - Supply	1.5 mA	1.5 mA	1.5 mA	1.5 mA	210 µA	1.35 mA	Not specified
Current - Output / Channel	40 mA	40 mA	30 mA	40 mA	12 mA	28 mA	10 mA
Voltage - Supply Span (Min)	3 V	3 V	3 V	3 V	9 V	8 V	10 V
Voltage - Supply Span (Max)	32 V	32 V	30 V	30 V	36 V	36 V	30 V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The LM324ADR2G is the primary direct equivalent, manufactured by onsemi with active product status and ROHS3 compliance. This part maintains all electrical specifications of the LM324ADR2 while offering improved regulatory compliance and ongoing manufacturer support. The LM324AD from STMicroelectronics provides an alternative direct equivalent with active status and ROHS3 compliance, though it specifies a maximum supply voltage of 30 V compared to the original 32 V specification.

For Extended Temperature Range Applications:

The LM224ADT from STMicroelectronics extends the operating temperature range to -40°C to 105°C while maintaining the same electrical performance envelope and output current capability of 40 mA per channel. This part is suitable for applications requiring operation beyond the standard 0°C to 70°C range.

For Enhanced Performance Requirements:

The AD8684ARZ series (J-FET amplifier type) offers significantly improved input bias current (6 pA versus 40 nA) and higher slew rate (9 V/µs versus unspecified), making it suitable for applications requiring lower input current and faster transient response. The ADA4000-4ARZ provides further performance enhancement with 5 MHz gain bandwidth product and extended temperature range to -40°C to 125°C. The ADA4004-4ARZ offers the highest gain bandwidth product (12 MHz) and lowest input offset voltage (40 µV) for precision applications, though with reduced output current capability (10 mA per channel).

All substitute parts listed maintain ROHS3 compliance and are classified as active products with ongoing manufacturer support, addressing the obsolescence status of the original LM324ADR2.

Frequently Asked Questions (FAQ)

Q: Can the LM324ADR2G be used as a direct replacement for the LM324ADR2?

A: Yes. The LM324ADR2G maintains identical electrical specifications including gain bandwidth product (1 MHz), input bias current (40 nA), input offset voltage (2 mV), supply voltage range (3 V to 32 V), and output current per channel (40 mA). Both parts use the 14-SOIC package. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the difference between the LM324AD and LM324ADR2G?

A: Both are direct equivalents with identical electrical specifications. The LM324AD is manufactured by STMicroelectronics while the LM324ADR2G is manufactured by onsemi. The LM324AD specifies a maximum supply voltage of 30 V compared to 32 V for the LM324ADR2G. Both are ROHS3 compliant and active products.

Q: When should I use the LM224ADT instead of the LM324ADR2G?

A: The LM224ADT is selected when extended operating temperature range is required. It operates from -40°C to 105°C compared to 0°C to 70°C for the LM324ADR2G. Electrical performance and package configuration remain equivalent.

Q: What are the advantages of the AD8684ARZ over the LM324ADR2?

A: The AD8684ARZ uses J-FET input technology, resulting in significantly lower input bias current (6 pA versus 40 nA) and higher slew rate (9 V/µs). It also offers extended temperature range (-40°C to 85°C) and higher gain bandwidth product (3.5 MHz). However, it requires a minimum supply voltage of 9 V (versus 3 V for the LM324ADR2) and provides lower output current per channel (12 mA versus 40 mA).

Q: Is the ADA4004-4ARZ suitable for all LM324ADR2 applications?

A: The ADA4004-4ARZ offers superior performance in gain bandwidth product (12 MHz) and input offset voltage (40 µV), making it suitable for precision applications. However, it has reduced output current capability (10 mA per channel versus 40 mA) and requires a minimum supply voltage of 10 V. Applications requiring high output current or low supply voltage operation should use the LM324ADR2G or LM224ADT instead.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in 14-SOIC surface mount package. Packaging options (Cut Tape, Digi-Reel, Tube, or Tape & Reel) vary by manufacturer and part number. Verify specific packaging availability with the supplier for your procurement requirements.

Q: What is the impact of switching from the LM324ADR2 to a J-FET amplifier like the AD8684ARZ?

A: J-FET amplifiers have dramatically lower input bias current (6 pA versus 40 nA), which reduces input current errors in high-impedance circuits. However, they require higher minimum supply voltage (9 V versus 3 V) and may have different frequency response characteristics. Circuit redesign may be necessary to accommodate these differences.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed (LM324ADR2G, LM324AD, LM224ADT, AD8684ARZ series, ADA4000-4ARZ, and ADA4004-4ARZ) are ROHS3 compliant. The original LM324ADR2 is RoHS non-compliant.

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