LM324D Equivalent & Substitute Parts

Part Overview

The LM324D is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in a 14-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The LM324D serves applications requiring low-cost, general-purpose amplification across industrial, consumer, and commercial electronics. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and accommodate alternative sourcing strategies for production environments.

Key Parameters

Parameter	LM324D 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
Mounting Type	Surface Mount	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the LM324D is determined by the following critical parameters:

Primary Substitution Criteria:

Number of circuits: 4 (all substitutes must be quad-channel devices)
Package type: 14-SOIC surface mount configuration
Voltage supply span: Minimum 3V, Maximum 30V or greater
Operating temperature range: 0°C to 70°C or extended range
Current output per channel: 40 mA or greater
Compliance: ROHS3 compliant, MSL 1 rating

Secondary Compatibility Parameters:

Gain bandwidth product: 1.2 MHz or greater
Input bias current: 20 nA or lower (lower values indicate improved performance)
Input offset voltage: 3 mV or lower
Slew rate: 0.5 V/µs or greater

Substitute parts are grouped into three categories based on product status and electrical performance:

Category 1 - Active Production Equivalents (Texas Instruments LinCMOS™ Series): LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB. These devices maintain identical packaging and pinout with active manufacturing status and full compliance certifications.

Category 2 - Low-Power Alternative (Texas Instruments LP324 Series): LP324M/NOPB, LP324MX/NOPB. These devices provide reduced power consumption (85 µA supply current versus 1.4 mA) with trade-offs in slew rate (0.05 V/µs) and output current (10 mA per channel), suitable for power-constrained applications.

Category 3 - Extended Temperature & Obsolete Alternatives: LM324DR (Rohm Semiconductor), LM2902DR (Rohm Semiconductor), LM324DR2G (onsemi), LM324EDR2G (onsemi). These devices offer extended operating temperature ranges or alternative sourcing with varying electrical characteristics.

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
LM324D	Texas Instruments	Last Time Buy	0.5	1.2	20	3	1.4	40	0 to 70	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
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
LM324DR2G	onsemi	Active	—	1	90	2	—	40	0 to 70	14-SOIC
LM324EDR2G	onsemi	Active	—	—	90	2	—	40	0 to 70	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

LM324AMX/NOPB and LM324MX/NOPB are the preferred substitutes for the LM324D. Both devices are manufactured by Texas Instruments, maintain active production status, and provide identical 14-SOIC packaging. These parts are ROHS3 compliant with MSL 1 rating, matching the original device compliance profile. The LinCMOS™ series designation indicates optimized performance characteristics. While the gain bandwidth product is specified at 1 MHz (versus 1.2 MHz for the LM324D), this represents a minor reduction suitable for most general-purpose amplification applications. Input offset voltage is improved at 2 mV. These devices are available in high inventory quantities (36,756 and 50,513 units respectively) and support both tube and cut tape packaging options.

Secondary Substitutes (Extended Temperature Applications):

LM324DR and LM2902DR, both manufactured by Rohm Semiconductor, provide extended operating temperature ranges (-40°C to 85°C and -40°C to 125°C respectively) with identical 14-SOIC packaging. These devices are classified as obsolete but maintain substantial inventory availability (345,100 and 90,223 units). The LM2902DR offers the widest temperature specification (-40°C to 125°C), making it suitable for industrial and automotive environments. Both devices are ROHS3 compliant with MSL 1 rating. Trade-offs include reduced slew rate (0.3 V/µs) and lower output current per channel (30 mA versus 40 mA).

Alternative Sourcing (onsemi Devices):

LM324DR2G and LM324EDR2G, manufactured by onsemi, provide active production alternatives with identical 14-SOIC packaging and 40 mA output current per channel. Both devices maintain ROHS3 compliance and MSL 1 rating. These parts support the same voltage supply span (3V to 32V) and operating temperature range (0°C to 70°C) as the original LM324D. Higher input bias current (90 nA versus 20 nA) represents the primary electrical difference. Inventory availability is substantial (105,300 and 25,969 units respectively).

Low-Power Alternative (Power-Constrained Designs):

LP324M/NOPB and LP324MX/NOPB are suitable only for applications where reduced power consumption is prioritized over performance. These devices reduce supply current to 85 µA (versus 1.4 mA) and output current to 10 mA per channel. The gain bandwidth product is reduced to 100 kHz, and slew rate is 0.05 V/µs. These specifications are incompatible with high-speed or high-current output applications. Both devices are ROHS3 compliant with MSL 1 rating and active production status.

Frequently Asked Questions (FAQ)

Q: Can LM324AMX/NOPB directly replace LM324D without circuit modification?

A: Yes. Both devices share identical 14-SOIC pinout, quad-channel configuration, and voltage supply specifications (3V to 32V). The LM324AMX/NOPB operates within the same temperature range (0°C to 70°C) and provides 40 mA output current per channel. The primary electrical difference is gain bandwidth product (1 MHz versus 1.2 MHz), which is acceptable for general-purpose amplification. No circuit modifications are required.

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

A: Both devices are manufactured by Texas Instruments with identical electrical specifications and 14-SOIC packaging. The primary difference is packaging format: LM324MX/NOPB is supplied in cut tape and Digi-Reel format, while LM324AMX/NOPB is supplied in tube packaging. Electrical performance and compliance certifications are identical. Selection depends on assembly process requirements.

Q: Why is the LM324D classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this specific part number. Existing inventory is limited to 5,452 units. Customers requiring this device should transition to active production alternatives such as LM324AMX/NOPB or LM324MX/NOPB to ensure long-term supply availability.

Q: Can LP324M/NOPB be used in high-speed applications?

A: No. The LP324M/NOPB is designed for low-power operation with a gain bandwidth product of 100 kHz and slew rate of 0.05 V/µs. These specifications are unsuitable for applications requiring bandwidth above 100 kHz or fast transient response. The device is limited to low-frequency signal conditioning and power-constrained environments.

Q: What are the compliance differences between substitute parts?

A: All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original LM324D. REACH status is unaffected for all devices. ECCN classification is EAR99 for all parts. No compliance barriers exist for substitution.

Q: Is the onsemi LM324DR2G suitable for automotive applications?

A: The LM324DR2G operates within the standard temperature range (0°C to 70°C), which is insufficient for automotive-grade specifications typically requiring -40°C to 125°C operation. For automotive applications, the Rohm Semiconductor LM2902DR (-40°C to 125°C) is the appropriate choice among the listed substitutes.

Q: What is the impact of higher input bias current in onsemi devices?

A: The onsemi LM324DR2G and LM324EDR2G specify 90 nA input bias current compared to 20 nA for the LM324D. This represents a 4.5× increase. In high-impedance input circuits (>1 MΩ), this difference may introduce measurable input offset errors. For standard impedance levels (<100 kΩ), the impact is negligible. Circuit analysis is required for high-impedance applications.

Q: Are all substitute parts available in 14-SOIC packaging?

A: Yes. All listed substitute parts are manufactured in 14-SOIC (0.154", 3.90mm width) surface mount packaging, maintaining mechanical and electrical compatibility with the original LM324D. No package conversion or PCB redesign is required.

Q: What is the difference between Rohm LM324DR and LM2902DR?

A: Both devices are manufactured by Rohm Semiconductor with identical electrical specifications and 14-SOIC packaging. The primary difference is operating temperature range: LM324DR operates from -40°C to 85°C, while LM2902DR operates from -40°C to 125°C. Both devices are classified as obsolete. Selection depends on maximum operating temperature requirements.

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