LM324DG Equivalent & Substitute Parts

Part Overview

The LM324DG is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a 4-circuit device in a 14-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design requirements and production continuity. The LM324DG operates across a supply voltage range of 3 V to 32 V with an operating temperature range of 0°C to 70°C, making it suitable for general-purpose amplification applications requiring low input bias current and moderate bandwidth characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1	MHz
Current - Input Bias	90	nA
Voltage - Input Offset	2	mV
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LM324DG is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 4 channels
Package type: 14-SOIC surface mount configuration
Gain bandwidth product: 1 MHz minimum
Input bias current: 90 nA maximum
Input offset voltage: 2 mV maximum
Output current per channel: 40 mA minimum
Supply voltage range: 3 V to 32 V minimum span
Operating temperature compatibility: 0°C to 70°C minimum range

Substitute Categories:

Direct Equivalents (General Purpose, 1 MHz Bandwidth): Parts meeting all primary criteria with identical or superior electrical performance within the specified operating envelope. These include the LM324MX/NOPB (Texas Instruments) and AS324 series (Diodes Incorporated), which maintain the same gain bandwidth product and supply voltage specifications.

Enhanced Performance Alternatives (Higher Bandwidth, Improved Specifications): Parts exceeding the LM324DG specifications in gain bandwidth product, slew rate, or input offset voltage while maintaining package compatibility and supply voltage range. These include the ADA4004-4ARZ series (Analog Devices) with 12 MHz bandwidth and the ADTL084ARZ series with J-FET input characteristics and 5 MHz bandwidth.

Amplifier Type Variants: The ADTL084ARZ series represents J-FET input amplifiers offering significantly lower input bias current (2 pA) compared to the bipolar input LM324DG (90 nA), suitable for applications requiring ultra-low input current characteristics while maintaining the 4-circuit configuration and 14-SOIC package.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
LM324DG	onsemi	General Purpose	1	90	2	40	3	32	0 to 70	Obsolete
LM324MX/NOPB	Texas Instruments	General Purpose	1	45	2	40	3	32	0 to 70	Active
ADA4004-4ARZ	Analog Devices Inc.	General Purpose	12	40	0.04	10	10	30	-40 to 125	Active
ADA4004-4ARZ-R7	Analog Devices Inc.	General Purpose	12	40	0.04	10	10	30	-40 to 125	Active
ADA4004-4ARZ-RL	Analog Devices Inc.	General Purpose	12	40	0.04	10	10	30	-40 to 125	Active
ADTL084ARZ	Analog Devices Inc.	J-FET	5	0.002	1.5	27	8	36	-40 to 125	Active
ADTL084ARZ-REEL	Analog Devices Inc.	J-FET	5	0.002	1.5	27	8	36	-40 to 125	Active
ADTL084ARZ-REEL7	Analog Devices Inc.	J-FET	5	0.002	1.5	27	8	36	-40 to 125	Active
AS324AMTR-E1	Diodes Incorporated	General Purpose	1	20	2	40	3	36	-40 to 85	Active
AS324AMTR-G1	Diodes Incorporated	General Purpose	1	20	2	40	3	36	-40 to 85	Active
AS324MTR-E1	Diodes Incorporated	General Purpose	1	20	2	40	3	36	-40 to 85	Active

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Mitigation):

The LM324MX/NOPB from Texas Instruments serves as the primary direct substitute for the LM324DG. This part maintains identical electrical specifications (1 MHz gain bandwidth product, 2 mV input offset voltage, 40 mA output current per channel) and supply voltage range (3 V to 32 V). The LM324MX/NOPB is classified as active with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring long-term availability and regulatory compliance. The part is available in high inventory quantities (50,513 pcs) across multiple packaging formats.

For Extended Temperature Range Applications:

The AS324 series (AS324AMTR-E1, AS324AMTR-G1, AS324MTR-E1) from Diodes Incorporated provides active general-purpose 4-circuit amplifiers with identical 1 MHz bandwidth and 2 mV input offset voltage specifications. These parts extend the maximum supply voltage to 36 V and offer improved input bias current (20 nA versus 90 nA). Operating temperature range extends to -40°C to 85°C, providing broader environmental coverage than the LM324DG. ROHS3 compliance and MSL 1 rating confirm regulatory alignment.

For Enhanced Performance Requirements:

The ADA4004-4ARZ series from Analog Devices represents a performance upgrade path, offering 12 MHz gain bandwidth product, superior input offset voltage (40 µV), and extended operating temperature range (-40°C to 125°C). These parts are suitable for applications requiring higher bandwidth and precision characteristics while maintaining the 4-circuit 14-SOIC configuration. ROHS3 compliance is confirmed. Note that the minimum supply voltage increases to 10 V and maximum output current per channel decreases to 10 mA.

For Ultra-Low Input Bias Current Applications:

The ADTL084ARZ series from Analog Devices employs J-FET input technology, delivering input bias current of 2 pA (compared to 90 nA for the LM324DG). This configuration is appropriate for high-impedance signal sources and precision measurement circuits. The series maintains 4-circuit configuration and 14-SOIC packaging with extended temperature range (-40°C to 125°C) and ROHS3 compliance. Supply voltage range spans 8 V to 36 V.

Compliance and Availability Considerations:

All recommended substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the LM324DG. All parts are classified as active products with confirmed inventory availability, ensuring production continuity and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the LM324MX/NOPB directly replace the LM324DG without circuit modification?

A: Yes. The LM324MX/NOPB maintains identical electrical specifications for gain bandwidth product (1 MHz), input offset voltage (2 mV), output current per channel (40 mA), and supply voltage range (3 V to 32 V). Both parts are configured as 4-circuit general-purpose amplifiers in 14-SOIC surface mount packages. No circuit modifications are required for functional equivalence within the specified operating envelope.

Q: What is the primary difference between the AS324 series and the LM324DG?

A: The AS324 series (Diodes Incorporated) provides identical electrical performance to the LM324DG with improved input bias current (20 nA versus 90 nA) and extended maximum supply voltage (36 V versus 32 V). The operating temperature range extends to -40°C to 85°C. All other parameters remain equivalent. The AS324 series is active and widely available.

Q: When should the ADA4004-4ARZ be selected over direct equivalents?

A: The ADA4004-4ARZ is selected when applications require higher bandwidth (12 MHz versus 1 MHz), superior input offset voltage accuracy (40 µV versus 2 mV), or extended operating temperature range (-40°C to 125°C). The trade-off is increased minimum supply voltage (10 V versus 3 V) and reduced output current per channel (10 mA versus 40 mA). This part is suitable for precision signal conditioning and measurement applications.

Q: What are the advantages of J-FET input amplifiers like the ADTL084ARZ?

A: J-FET input amplifiers deliver ultra-low input bias current (2 pA versus 90 nA for bipolar input designs), making them suitable for high-impedance signal sources and applications where input current leakage must be minimized. The ADTL084ARZ maintains 4-circuit configuration and 14-SOIC packaging with 5 MHz bandwidth and extended temperature range (-40°C to 125°C).

Q: Are all substitute parts available in the same packaging options as the LM324DG?

A: All substitute parts are available in 14-SOIC surface mount packages. Packaging format variations (Cut Tape, Tape & Reel, Tube) differ by manufacturer and part number suffix. Verify specific packaging requirements with the selected supplier before procurement.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (unlimited) indicates the component has no moisture sensitivity restrictions and requires no special handling or baking procedures prior to soldering. MSL 3 (168 hours) requires storage in dry conditions and may require baking before reflow soldering. The LM324DG carries MSL 1; most substitute parts maintain this rating, with exceptions noted in the ADA4004 and AS324AMTR-G1 variants (MSL 3).

Q: Can the LM324DG be used in new designs, or should substitutes be specified?

A: The LM324DG is classified as obsolete and should not be specified for new designs. Active substitute parts such as the LM324MX/NOPB, AS324 series, or ADA4004 series should be selected to ensure long-term supply availability and production continuity.

Q: What compliance certifications apply to all recommended substitute parts?

A: All recommended substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the LM324DG. ECCN classification is EAR99 for all parts, and HTSUS code is 8542.33.0001.

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