LM224KADG4 Equivalent & Substitute Parts

Part Overview

The LM224KADG4 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 part is classified as Last Time Buy, indicating discontinued production with limited availability. The device operates across a supply voltage range of 3V to 30V and is suitable for applications requiring low-input bias current and moderate bandwidth characteristics. Substitute parts are necessary due to inventory constraints and product lifecycle status.

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	15	nA
Voltage - Input Offset	2	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	-25 to 85	°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

Substitution of the LM224KADG4 is determined by the following critical parameters: 4-circuit configuration, 14-SOIC package footprint, general-purpose amplifier classification, supply voltage range compatibility (minimum 3V, maximum 30V or higher), slew rate (0.5V/µs or greater), gain bandwidth product (1.2MHz or greater), input bias current (15nA or lower), and output current capability (30mA or greater per channel).

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents — Parts maintaining identical or superior electrical specifications within the same package type (14-SOIC), including LM224KAD, LM224KADR, LM324MX/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324AM/NOPB. These parts preserve all critical performance parameters.

Category 2: Functional Equivalents with Parameter Variations — Parts that satisfy the 4-circuit, 14-SOIC configuration but exhibit differences in secondary parameters such as slew rate, gain bandwidth product, input bias current, or supply current. This category includes LP324M/NOPB, LP324MX/NOPB, LM2902DR, and BA10324AF-E2. These parts are suitable only when application requirements permit the specified parameter deviations.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Current (mA)	Output Current (mA)	Voltage Supply Min (V)	Voltage Supply Max (V)	Temp Range (°C)	Package	Status
LM224KADG4	Texas Instruments	0.5	1.2	15	1.4	30	3	30	-25 to 85	14-SOIC	Last Time Buy
LM224KAD	Texas Instruments	0.5	1.2	15	1.4	30	3	30	-25 to 85	14-SOIC	Last Time Buy
LM224KADR	Texas Instruments	0.5	1.2	15	1.4	30	3	30	-25 to 85	14-SOIC	Active
LM324MX/NOPB	Texas Instruments	—	1	45	1.5	40	3	32	0 to 70	14-SOIC	Active
LM324AMX/NOPB	Texas Instruments	—	1	45	1.5	40	3	32	0 to 70	14-SOIC	Active
LM324M/NOPB	Texas Instruments	—	1	45	1.5	40	3	32	0 to 70	14-SOIC	Active
LM324AM/NOPB	Texas Instruments	—	1	45	1.5	40	3	32	0 to 70	14-SOIC	Active
LP324MX/NOPB	Texas Instruments	0.05	0.1	2	0.085	10	3	32	0 to 70	14-SOIC	Active
LP324M/NOPB	Texas Instruments	0.05	0.1	2	0.085	10	3	32	0 to 70	14-SOIC	Active
LM2902DR	Rohm Semiconductor	0.3	1.2	20	1	30	3	32	-40 to 125	14-SOIC	Obsolete
BA10324AF-E2	Rohm Semiconductor	0.2	0.5	20	0.6	35	3	32	-40 to 85	14-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

LM224KADR is the preferred substitute. It maintains identical electrical specifications to the LM224KADG4 across all critical parameters: 0.5V/µs slew rate, 1.2MHz gain bandwidth product, 15nA input bias current, and 30mA output current per channel. The part is currently in Active product status with 2982 units in stock, ensuring long-term availability. Packaging differs only in format (Tape & Reel versus Tube), which does not affect electrical performance or PCB assembly compatibility.

LM224KAD provides identical electrical performance and is available in Tube packaging with 2980 units in stock. Product status is Last Time Buy, indicating limited future availability.

Secondary Substitutes (Active Production, Parameter Trade-offs):

LM324MX/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324AM/NOPB are all Active production parts from Texas Instruments with substantial inventory (36,756 to 105,684 units). These parts maintain the 4-circuit, 14-SOIC configuration and 3V to 32V supply range. However, they exhibit lower gain bandwidth product (1MHz versus 1.2MHz) and higher input bias current (45nA versus 15nA). Operating temperature range is restricted to 0°C to 70°C compared to the original -25°C to 85°C. These parts are suitable for applications where the reduced bandwidth and higher input bias current are acceptable.

Low-Power Alternatives:

LP324MX/NOPB and LP324M/NOPB are low-power variants with significantly reduced slew rate (0.05V/µs), gain bandwidth product (100kHz), and output current capability (10mA per channel). These parts are suitable only for applications with relaxed speed and current requirements. Supply current is reduced to 85µA, providing power efficiency benefits in battery-powered designs.

Non-Recommended Substitutes:

LM2902DR (Rohm Semiconductor) is classified as Obsolete and should not be selected for new designs despite high inventory availability (90,223 units). BA10324AF-E2 exhibits significantly reduced gain bandwidth product (500kHz) and slew rate (0.2V/µs), making it unsuitable for applications requiring the original performance specifications.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory compatibility with the original part.

Frequently Asked Questions (FAQ)

Q1: Can LM324MX/NOPB directly replace LM224KADG4 in existing designs?

A: LM324MX/NOPB is electrically compatible at the package level (14-SOIC footprint) and maintains the 4-circuit configuration. However, it exhibits reduced gain bandwidth product (1MHz versus 1.2MHz), higher input bias current (45nA versus 15nA), and narrower operating temperature range (0°C to 70°C versus -25°C to 85°C). Substitution is valid only when application specifications permit these parameter deviations. Circuit simulation or bench testing is required to confirm performance in temperature-critical or high-impedance applications.

Q2: What is the difference between LM224KADG4 and LM224KADR?

A: Both parts are manufactured by Texas Instruments and maintain identical electrical specifications. The difference is packaging format: LM224KADG4 is supplied in Tube packaging, while LM224KADR is supplied in Tape & Reel format. Both are compatible with standard PCB assembly processes. LM224KADR is currently in Active product status with higher inventory availability.

Q3: Why is LM2902DR not recommended despite high inventory?

A: LM2902DR is classified as Obsolete product status. Although 90,223 units are in stock, obsolete parts carry risk of supply discontinuation and lack of manufacturer support. Additionally, LM2902DR exhibits lower slew rate (0.3V/µs versus 0.5V/µs) and reduced supply voltage maximum (32V versus 30V), making it a functional but not optimal substitute.

Q4: Are LP324M/NOPB and LP324MX/NOPB suitable for high-speed applications?

A: No. LP324 variants are low-power operational amplifiers with gain bandwidth product of 100kHz and slew rate of 0.05V/µs. These specifications are significantly lower than the LM224KADG4 (1.2MHz and 0.5V/µs respectively). LP324 parts are suitable only for low-frequency, low-power applications such as sensor signal conditioning or audio-frequency filtering where bandwidth requirements are below 100kHz.

Q5: What is the impact of operating temperature range differences?

A: LM224KADG4 operates from -25°C to 85°C, while LM324 variants operate from 0°C to 70°C. If the application requires operation below 0°C or above 70°C, LM324 substitutes are not suitable. LM224KADR maintains the original -25°C to 85°C range and is the appropriate choice for extended temperature applications.

Q6: Can multiple substitute parts be used interchangeably on the same PCB?

A: Yes, provided all parts maintain the same package footprint (14-SOIC) and pin configuration. However, mixing different part numbers on a single board introduces performance variability and complicates troubleshooting. Best practice is to standardize on a single substitute part number across all units in a production run.

Q7: What packaging considerations apply to substitution?

A: All recommended substitutes use 14-SOIC surface mount packaging with identical footprint dimensions (0.154" width, 3.90mm). Tube, Tape & Reel, and Cut Tape packaging formats are all compatible with standard pick-and-place assembly equipment. Packaging format selection depends on production volume and assembly process requirements, not electrical performance.

Q8: Are there supply voltage compatibility issues between substitutes?

A: LM224KADG4 operates from 3V to 30V. Most substitutes (LM224KAD, LM224KADR, LM324 variants, LP324 variants) operate from 3V to 32V, providing extended maximum voltage capability. LM2902DR also supports 3V to 32V. All substitutes are compatible with the original 3V to 30V supply range. Applications using supply voltages between 30V and 32V require verification that the original design does not depend on the 30V maximum limit.

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