LM224KADR Equivalent & Substitute Parts

Part Overview

The LM224KADR is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as Active product status and is ROHS3 compliant. The LM224KADR serves applications requiring low-cost, general-purpose amplification with moderate bandwidth and supply voltage flexibility. Substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence within the general-purpose amplifier category.

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

Substitute parts for the LM224KADR are selected based on the following criteria:

Primary Matching Parameters:

Number of circuits: 4
Package type: 14-SOIC surface mount
Amplifier classification: General Purpose
Supply voltage range: Minimum 3V, Maximum ≥30V
RoHS3 compliance and MSL Level 1

Secondary Compatibility Parameters:

Slew rate: 0.3 V/µs or higher
Gain bandwidth product: 1.0 MHz or higher
Input bias current: ≤90 nA
Input offset voltage: ≤2 mV
Output current per channel: ≥30 mA
Operating temperature range: Must encompass or exceed -25°C to 85°C

Substitutes are grouped into two categories: Direct Equivalents (matching all primary parameters with minimal electrical variation) and Functional Equivalents (meeting primary parameters with acceptable electrical specification differences for general-purpose applications).

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Span Min-Max (V)	Temp Range (°C)	Package
LM224KADR	Texas Instruments	Active	0.5	1.2	15	3–30	-25 to 85	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	3–32	-40 to 125	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1.0	45	3–32	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1.0	45	3–32	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1.0	45	3–32	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	3–32	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	3–32	0 to 70	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.2	0.5	20	3–32	-40 to 85	14-SOIC
BA2902F-E2	Rohm Semiconductor	Active	0.2	0.5	20	3–32	-40 to 125	14-SOIC
LM224ADT	STMicroelectronics	Active	0.4	1.3	20	3–30	-40 to 105	14-SOIC
LM224DR2G	onsemi	Active	—	1.0	90	3–32	-25 to 85	14-SOIC

Engineering Selection Recommendations

Tier 1 – Direct Substitutes (Preferred for Drop-In Replacement):

LM224ADT (STMicroelectronics) and LM224KADR share the same base product number (LM224), matching slew rate (0.4–0.5 V/µs), gain bandwidth product (1.2–1.3 MHz), and supply voltage span (3–30V). Both are Active status products with ROHS3 compliance. LM224ADT offers extended operating temperature range (-40°C to 105°C) compared to the original part. This part is suitable for applications requiring identical electrical performance with enhanced temperature coverage.

Tier 2 – Functional Equivalents (Compatible with Minor Specification Differences):

LM324AMX/NOPB, LM324AM/NOPB, and LM324M/NOPB (all Texas Instruments, LM324 base series) are Active status products with 14-SOIC packaging and ROHS3 compliance. These parts operate within the 3–32V supply range and meet the 4-circuit, general-purpose amplifier requirement. The gain bandwidth product is 1.0 MHz (slightly lower than LM224KADR's 1.2 MHz), and input bias current is 45 nA (higher than the original 15 nA). These substitutes are suitable for applications where the lower bandwidth and higher input bias current are acceptable.

Tier 3 – Extended Temperature Range Alternatives:

BA2902F-E2 (Rohm Semiconductor) provides operating temperature range of -40°C to 125°C with Active status and ROHS3 compliance. Slew rate is 0.2 V/µs and gain bandwidth product is 0.5 MHz, representing reduced performance compared to LM224KADR. This part is suitable only for applications where extended temperature operation is critical and reduced bandwidth is acceptable.

Parts to Avoid:

LM2902DR (Rohm Semiconductor) carries Obsolete product status and should not be selected for new designs despite electrical compatibility.

LP324M/NOPB and LP324MX/NOPB (Texas Instruments, LP324 base series) feature significantly reduced slew rate (0.05 V/µs) and gain bandwidth product (0.1 MHz), making them unsuitable for applications requiring the LM224KADR's performance level.

Frequently Asked Questions (FAQ)

Q: Can LM324AMX/NOPB directly replace LM224KADR in all applications?

A: LM324AMX/NOPB is functionally compatible for general-purpose amplifier applications but with specification differences. The gain bandwidth product is 1.0 MHz versus 1.2 MHz for LM224KADR, and input bias current is 45 nA versus 15 nA. Applications sensitive to bandwidth or input bias current performance should be evaluated individually. Both parts share 14-SOIC packaging, 4-circuit configuration, and 3V minimum supply voltage.

Q: What is the primary difference between LM224 and LM324 series substitutes?

A: Both series are general-purpose 4-circuit operational amplifiers in 14-SOIC packaging with ROHS3 compliance. The LM224 series (including LM224KADR and LM224ADT) typically features higher slew rate (0.4–0.5 V/µs) and gain bandwidth product (1.2–1.3 MHz) compared to LM324 series (1.0 MHz gain bandwidth product). LM224 series is optimized for applications requiring faster signal response, while LM324 series offers lower cost with adequate performance for standard general-purpose applications.

Q: Why is LM2902DR listed as Obsolete?

A: LM2902DR carries Obsolete product status, indicating it is no longer manufactured or supported by Rohm Semiconductor. New designs should not incorporate this part. Active alternatives such as LM224ADT or LM324AMX/NOPB should be selected instead.

Q: Are LP324M/NOPB and LP324MX/NOPB suitable substitutes?

A: LP324M/NOPB and LP324MX/NOPB are not suitable substitutes for LM224KADR in applications requiring the original part's performance. These parts feature slew rate of 0.05 V/µs and gain bandwidth product of 0.1 MHz, representing a 10-fold reduction in bandwidth. They are designed for ultra-low-power applications where bandwidth is not critical. Both parts are Active status with ROHS3 compliance and 14-SOIC packaging.

Q: What packaging considerations apply to these substitutes?

A: All listed substitutes use 14-SOIC surface mount packaging with 0.154" (3.90mm) width, matching the LM224KADR footprint. BA10324AF-E2 and BA2902F-E2 use 14-SOP packaging with 0.173" (4.40mm) width, which is mechanically incompatible with LM224KADR PCB layouts. Verify PCB footprint compatibility before selecting these Rohm Semiconductor alternatives.

Q: Which substitute offers the best temperature range coverage?

A: BA2902F-E2 (Rohm Semiconductor) provides the widest operating temperature range of -40°C to 125°C. However, this part features reduced slew rate (0.2 V/µs) and gain bandwidth product (0.5 MHz). For applications requiring both extended temperature range and performance matching LM224KADR, LM224ADT (STMicroelectronics) offers -40°C to 105°C operation with slew rate of 0.4 V/µs and gain bandwidth product of 1.3 MHz.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 compliance status. All parts also have Moisture Sensitivity Level (MSL) of 1 (Unlimited), matching the LM224KADR specification.

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