LM324DG4 Equivalent & Substitute Parts

Part Overview

The LM324DG4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in 14-SOIC surface mount packaging. This component operates across a supply voltage range of 3V to 30V with an operating temperature range of 0°C to 70°C. The device is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support long-term production requirements for applications utilizing this operational amplifier topology.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.5	V/µs
Gain Bandwidth Product	1.2	MHz
Current - Input Bias	20	nA
Voltage - Input Offset	3	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°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 LM324DG4 are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Compatibility Parameters:

Number of circuits: 4 (mandatory)
Package type: 14-SOIC surface mount (mandatory)
Supply voltage range: minimum 3V, maximum ≥30V
Operating temperature range: 0°C to 70°C or extended
Gain bandwidth product: 1.2 MHz (primary specification)
Output current per channel: ≥40 mA

Substitution Categories:

Category 1 - Direct Electrical Equivalents (Active Status): Parts meeting all critical parameters with active product status. These include LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB from Texas Instruments, all featuring 1 MHz gain bandwidth product and compatible electrical characteristics.

Category 2 - Functional Equivalents (Active Status): Parts with compatible electrical performance and active availability. LM324D (STMicroelectronics) and LM324EDR2G (onsemi) provide equivalent functionality with minor parameter variations within acceptable engineering tolerances.

Category 3 - Extended Temperature Range Alternatives: LM324DR and LM2902DR (Rohm Semiconductor) offer extended operating temperature ranges (-40°C to 85°C and -40°C to 125°C respectively) suitable for applications requiring broader thermal performance.

Category 4 - Low-Power Alternatives: LP324M/NOPB and LP324MX/NOPB provide reduced power consumption (85µA supply current versus 1.4mA) with lower gain bandwidth product (100 kHz) for power-sensitive applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
LM324DG4	Texas Instruments	Last Time Buy	0.5	1.2	20	3	1.4	40	0 to 70	14-SOIC
LM324D	STMicroelectronics	Active	0.4	1.2	20	2	1.5	40	0 to 70	14-SOIC
LM324DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1	1	30	-40 to 85	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1	1	30	-40 to 125	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	—	1	45	2	1.5	40	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	2	0.085	10	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	2	0.085	10	0 to 70	14-SOIC
LM324EDR2G	onsemi	Active	—	1.2	90	2	—	40	0 to 70	14-SOIC

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Options):

Select LM324D (STMicroelectronics) or LM324EDR2G (onsemi) as primary substitutes. Both maintain active product status, 14-SOIC packaging, 1.2 MHz gain bandwidth product, and 40 mA output current per channel. LM324D provides marginally improved input offset voltage (2 mV versus 3 mV) and identical slew rate performance within acceptable engineering tolerance. LM324EDR2G maintains exact gain bandwidth product specification with active availability through Tape & Reel packaging.

For Texas Instruments Ecosystem Continuity:

LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB are active alternatives within the Texas Instruments product line. These parts feature 1 MHz gain bandwidth product (slightly reduced from 1.2 MHz), compatible 40 mA output current, and LinCMOS™ series designation. Packaging options include Tube (AM/M variants) and Cut Tape/Digi-Reel (AMX/MX variants) for supply chain flexibility.

For Extended Temperature Applications:

LM324DR and LM2902DR (Rohm Semiconductor) support extended operating temperature ranges (-40°C to 85°C and -40°C to 125°C respectively). These parts are classified as Obsolete but maintain high inventory availability (345,100 and 90,223 units respectively). Selection requires confirmation that reduced output current (30 mA versus 40 mA) and lower supply current (1 mA versus 1.4 mA) are acceptable for the application.

For Power-Constrained Applications:

LP324M/NOPB and LP324MX/NOPB provide ultra-low supply current (85 µA) with reduced gain bandwidth product (100 kHz). These parts are suitable only for applications where the lower bandwidth specification is compatible with circuit requirements.

Compliance Verification:

All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the original LM324DG4 regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LM324AM/NOPB directly replace LM324DG4 in all applications?

A: LM324AM/NOPB is electrically compatible for most general-purpose amplifier applications. The primary difference is reduced gain bandwidth product (1 MHz versus 1.2 MHz). Applications with frequency response requirements above 1 MHz may require circuit re-evaluation. Input bias current is higher (45 nA versus 20 nA), which may affect precision circuits with high-impedance sources.

Q: What is the difference between LM324MX/NOPB and LM324AMX/NOPB?

A: Both parts are electrically identical with 1 MHz gain bandwidth product, 45 nA input bias current, and 40 mA output current. The primary difference is packaging: LM324MX/NOPB is supplied in Cut Tape (CT) & Digi-Reel format, while LM324AMX/NOPB uses the same packaging. Selection depends on assembly line requirements and tape reel compatibility.

Q: Is LM324D from STMicroelectronics a suitable replacement?

A: Yes. LM324D maintains 1.2 MHz gain bandwidth product matching the original specification, 14-SOIC packaging, and active product status. Input offset voltage is improved (2 mV versus 3 mV). Slew rate is marginally reduced (0.4 V/µs versus 0.5 V/µs), which is acceptable for most general-purpose applications.

Q: Why are LM324DR and LM2902DR listed as Obsolete?

A: Both parts are classified as Obsolete by their manufacturers (Rohm Semiconductor) but maintain substantial inventory availability. These parts are suitable for applications where extended temperature range (-40°C to 125°C for LM2902DR) is required. Obsolete status indicates no new production; existing stock should be evaluated for long-term supply planning.

Q: Can LP324M/NOPB replace LM324DG4?

A: LP324M/NOPB is not a direct replacement. The gain bandwidth product is significantly reduced (100 kHz versus 1.2 MHz), and output current is limited to 10 mA versus 40 mA. This part is suitable only for low-frequency, low-power applications where the reduced specifications are compatible with circuit requirements.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain 14-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical compatibility. Packaging format variations include Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR), which affect supply chain logistics but not electrical performance or PCB assembly compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original LM324DG4 regulatory status. REACH Unaffected status is consistent across all alternatives.

Q: What is the recommended substitute for new designs?

A: For new designs, select LM324D (STMicroelectronics) or LM324EDR2G (onsemi) as primary choices due to active product status, 1.2 MHz gain bandwidth product specification, and established long-term availability. For Texas Instruments ecosystem preference, LM324MX/NOPB or LM324AMX/NOPB provide active alternatives with 1 MHz gain bandwidth product and compatible electrical characteristics.

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