LM324DR2 Equivalent & Substitute Parts

Part Overview

The LM324DR2 is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface mount package. Manufactured by onsemi, this device operates across a supply voltage range of 3 V to 32 V with an input bias current of 90 nA and a gain bandwidth product of 1 MHz. The LM324DR2 is classified as obsolete, which necessitates identification of equivalent and substitute components for new designs and ongoing production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	LM324DR2	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1 MHz	MHz
Current - Input Bias	90 nA	nA
Voltage - Input Offset	2 mV	mV
Current - Output / Channel	40 mA	mA
Voltage - Supply Span (Min)	3 V	V
Voltage - Supply Span (Max)	32 V	V
Operating Temperature	0°C ~ 70°C	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the LM324DR2 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical electrical specifications and package configurations, enabling pin-for-pin replacement without circuit modification. These parts satisfy the core functional requirements: four independent general-purpose amplifier circuits, 14-SOIC package, 3 V to 32 V supply voltage range, 40 mA output current per channel, and 1 MHz gain bandwidth product.

Similar Substitutes provide equivalent functionality with variations in one or more electrical parameters such as slew rate, gain bandwidth product, input bias current, supply voltage range, or output current capability. These parts require circuit evaluation to confirm suitability for specific applications.

The critical parameters determining substitution eligibility are:

Number of circuits (must be 4)
Package type (must be 14-SOIC or compatible 14-SO)
Supply voltage range (minimum 3 V, maximum ≥ 30 V)
Output current per channel (minimum 40 mA for direct substitutes)
Mounting type (Surface Mount)

Parameter Comparison

Part Number	Manufacturer	Product Status	Gain Bandwidth Product (MHz)	Input Bias Current (nA)	Input Offset Voltage (mV)	Output Current / Channel (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temperature (°C)	RoHS Status
LM324DR2	onsemi	Obsolete	1	90	2	40	3	32	0 ~ 70	Non-compliant
LM324DR2G	onsemi	Active	1	90	2	40	3	32	0 ~ 70	ROHS3 Compliant
LM324DG4	Texas Instruments	Last Time Buy	1.2	20	3	40	3	30	0 ~ 70	ROHS3 Compliant
LF347D	STMicroelectronics	Active	3	0.02	3	40	44	44	0 ~ 70	ROHS3 Compliant
LM224DRG3	Texas Instruments	Last Time Buy	1.2	20	3	30	3	30	-25 ~ 85	ROHS3 Compliant
LM2900DR	Texas Instruments	Active	2.5	30	—	18	4.4	32	-40 ~ 85	ROHS3 Compliant
LM2902QS14-13	Diodes Incorporated	Active	0.7	20	2	40	2	36	-40 ~ 125	ROHS3 Compliant
LM2902YDT	STMicroelectronics	Active	1.3	20	2	60	3	30	-40 ~ 125	ROHS3 Compliant
LM324AM	onsemi	Obsolete	1	40	1.5	40	3	32	0 ~ 70	—
LM324AMX/NOPB	Texas Instruments	Active	1	45	2	40	3	32	0 ~ 70	ROHS3 Compliant
LM3900DR	Texas Instruments	Active	2.5	30	—	10	4.4	32	0 ~ 70	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitute (Recommended for Immediate Replacement)

LM324DR2G (onsemi) is the primary direct substitute for LM324DR2. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The transition from the obsolete LM324DR2 to LM324DR2G requires no circuit modifications and provides superior regulatory compliance for new production.

Active Alternatives with Equivalent Functionality

LM324AMX/NOPB (Texas Instruments) provides equivalent performance with active product status and ROHS3 compliance. This part maintains the 1 MHz gain bandwidth product, 40 mA output current per channel, and 3 V to 32 V supply voltage range. Input bias current is 45 nA, compared to 90 nA in the original part, representing improved performance.

Extended Temperature Range Options

LM2902YDT (STMicroelectronics) and LM2902QS14-13 (Diodes Incorporated) extend the operating temperature range to -40°C ~ 125°C with active product status and automotive qualification (AEC-Q100). These parts maintain 40 mA output current capability and are suitable for applications requiring enhanced temperature performance.

Performance-Enhanced Alternatives

LF347D (STMicroelectronics) offers superior slew rate (16 V/µs) and gain bandwidth product (3 MHz) with J-FET input architecture, reducing input bias current to 20 pA. This part is suitable for applications requiring higher bandwidth and lower input current characteristics.

Parts to Avoid

LM224DRG3 and LM324DG4 carry Last Time Buy status, indicating discontinued production. LM324AM and LM324DR2 are obsolete. New designs should not incorporate these parts.

Frequently Asked Questions (FAQ)

Q: Can LM324DR2G be used as a direct replacement for LM324DR2?

A: Yes. LM324DR2G is a direct substitute with identical electrical specifications, package configuration, and pin assignment. The primary difference is active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between LM324DR2 and LM324AMX/NOPB?

A: Both parts provide 1 MHz gain bandwidth product, 40 mA output current per channel, and 3 V to 32 V supply voltage operation. LM324AMX/NOPB has lower input bias current (45 nA vs. 90 nA) and is manufactured by Texas Instruments with active product status. Both are pin-compatible in 14-SOIC packages.

Q: Why is LF347D listed as a similar substitute rather than a direct substitute?

A: LF347D uses J-FET input architecture, resulting in significantly different electrical characteristics: 3 MHz gain bandwidth product (vs. 1 MHz), 20 pA input bias current (vs. 90 nA), and 16 V/µs slew rate (vs. unspecified). While functionally equivalent as a four-circuit operational amplifier, these differences require circuit evaluation for specific applications.

Q: Can LM2902YDT replace LM324DR2 in all applications?

A: LM2902YDT provides equivalent four-circuit functionality with 40 mA output current per channel and 3 V to 30 V supply voltage range. However, it features Push-Pull output type and extended temperature range (-40°C ~ 125°C). Applications operating above 70°C or requiring Push-Pull output characteristics benefit from this part. Applications limited to 0°C ~ 70°C operation should use LM324DR2G or LM324AMX/NOPB.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS3 compliance is mandatory for products sold in regulated markets. LM324DR2 is RoHS non-compliant, making it unsuitable for new designs. All recommended active substitutes (LM324DR2G, LM324AMX/NOPB, LM2902YDT, LF347D) are ROHS3 compliant.

Q: Are LM2900DR and LM3900DR suitable replacements?

A: LM2900DR and LM3900DR provide four-circuit general-purpose amplifier functionality with higher gain bandwidth product (2.5 MHz) and slew rate (20 V/µs). However, output current per channel is reduced to 18 mA and 10 mA respectively, compared to 40 mA in LM324DR2. These parts are suitable only for applications not requiring 40 mA output current per channel.

Q: What packaging options are available for LM324 equivalents?

A: All listed substitutes use 14-SOIC or compatible 14-SO surface mount packages with 0.154" (3.90 mm) width. Packaging variations include Cut Tape (CT) & Digi-Reel®, Tube, and Tape & Reel (TR). Package selection depends on procurement and assembly requirements rather than electrical compatibility.

Q: Can LM224DRG3 be used as a substitute?

A: LM224DRG3 carries Last Time Buy status, indicating discontinued production. While electrically similar with 1.2 MHz gain bandwidth product and extended temperature range (-25°C ~ 85°C), output current per channel is reduced to 30 mA. This part should not be selected for new designs.

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