LM224AD Equivalent & Substitute Parts

Part Overview

The LM224AD 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 is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LM224AD operates across a wide supply voltage range of 3V to 30V and is suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current. Due to its Last Time Buy status, identification of functionally equivalent substitute parts is necessary for design continuity and long-term component sourcing.

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 LM224AD are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Number of circuits: 4 (mandatory)
Package type: 14-SOIC surface mount (mandatory for PCB compatibility)
Supply voltage range: Minimum 3V, Maximum ≥30V (operational envelope)
Gain bandwidth product: 1.2 MHz (performance class)
Slew rate: 0.5 V/µs (signal fidelity)
Input bias current: 15 nA (input impedance class)
Output current per channel: 30 mA (load driving capability)

Substitution Categories:

Category 1: Direct Electrical Equivalents (Active Status) Parts matching all critical parameters with Active product status: LM224ADR, LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB

Category 2: Functional Equivalents with Parameter Variations Parts with 4 circuits, 14-SOIC package, but differing in secondary parameters (slew rate, bandwidth, bias current, supply current): LM2902DR, BA10324AF-E2, BA2902F-E2

Category 3: Low-Power Variants Parts with reduced supply current and output capability: LP324M/NOPB, LP324MX/NOPB

Substitution is valid only when the application requirements fall within the specified parameter ranges of the substitute part.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Current (mA)	Output Current (mA)	Supply Voltage Max (V)	Temp Range (°C)	Package
LM224AD	Texas Instruments	Last Time Buy	0.5	1.2	15	1.4	30	30	-25 to 85	14-SOIC
LM224ADR	Texas Instruments	Active	0.5	1.2	15	1.4	30	30	-25 to 85	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1.0	30	32	-40 to 125	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	32	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	32	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	32	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	32	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	0.085	10	32	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	0.085	10	32	0 to 70	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.6	35	32	-40 to 85	14-SOIC
BA2902F-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.7	30	32	-40 to 125	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: LM224ADR

LM224ADR is the direct equivalent of LM224AD with identical electrical specifications and 14-SOIC packaging. This part maintains Active product status with substantial inventory availability (133,500 units), ensuring long-term sourcing reliability. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect electrical performance. This part is ROHS3 compliant and carries identical compliance certifications. Selection of LM224ADR eliminates all substitution risk and is the preferred choice for design continuity.

Secondary Recommendations: LM324 Series (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB)

The LM324 series represents a functional alternative with Active product status and high inventory levels. These parts share the 4-circuit, 14-SOIC configuration and operate within compatible supply voltage ranges (3V to 32V). However, the LM324 series exhibits lower gain bandwidth product (1.0 MHz versus 1.2 MHz) and higher input bias current (45 nA versus 15 nA). These parts are suitable for applications where the reduced bandwidth and higher input impedance do not degrade system performance. Operating temperature range is narrower (0°C to 70°C versus -25°C to 85°C). All LM324 variants are ROHS3 compliant.

Tertiary Recommendations: Low-Power Variants (LP324M/NOPB, LP324MX/NOPB)

LP324 series parts are suitable only for applications requiring ultra-low supply current (85 µA versus 1.4 mA) and reduced output current capability (10 mA versus 30 mA per channel). These parts operate at 100 kHz bandwidth, significantly lower than the LM224AD specification. Selection is appropriate only when power consumption is the primary design constraint and bandwidth requirements are substantially reduced.

Alternative Manufacturers: BA10324AF-E2, BA2902F-E2 (Rohm Semiconductor)

Rohm Semiconductor parts provide 4-circuit, 14-SOIC configurations with Active product status. BA10324AF-E2 and BA2902F-E2 operate at 500 kHz bandwidth and 0.2 V/µs slew rate, both lower than LM224AD specifications. These parts are suitable for applications with reduced bandwidth requirements. BA2902F-E2 supports extended operating temperature range (-40°C to 125°C). Both parts are ROHS3 compliant.

Not Recommended: LM2902DR

LM2902DR carries Obsolete product status, indicating discontinued production. Although electrical parameters are compatible, the obsolete classification presents long-term sourcing risk and should be avoided for new designs.

Frequently Asked Questions (FAQ)

Q1: Can LM224ADR be used as a direct replacement for LM224AD?

Yes. LM224ADR is electrically identical to LM224AD with matching specifications across all critical parameters: 0.5 V/µs slew rate, 1.2 MHz gain bandwidth product, 15 nA input bias current, 30 mA output current per channel, and -25°C to 85°C operating temperature. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance. Both parts are ROHS3 compliant and carry identical compliance certifications.

Q2: What are the key differences between LM224AD and LM324 series parts?

The LM324 series (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB) differs in three primary parameters: (1) Gain bandwidth product is 1.0 MHz versus 1.2 MHz, representing 17% lower bandwidth; (2) Input bias current is 45 nA versus 15 nA, representing 3× higher input impedance loading; (3) Operating temperature range is 0°C to 70°C versus -25°C to 85°C, representing narrower temperature coverage. All parts maintain 4-circuit configuration, 14-SOIC packaging, and 3V to 32V supply voltage range. LM324 series is suitable for applications where reduced bandwidth and higher input impedance do not degrade performance.

Q3: Are LP324M/NOPB and LP324MX/NOPB suitable substitutes?

LP324 series parts are suitable only for applications where ultra-low supply current is a primary design requirement. These parts consume 85 µA total supply current versus 1.4 mA for LM224AD, representing 16× lower power consumption. However, bandwidth is reduced to 100 kHz (versus 1.2 MHz), and output current per channel is limited to 10 mA (versus 30 mA). Selection requires confirmation that the application can operate at 100 kHz bandwidth and 10 mA output current limits.

Q4: What is the significance of product status (Active, Last Time Buy, Obsolete)?

Product status indicates manufacturing and availability status. Active status confirms ongoing production and long-term sourcing availability. Last Time Buy indicates discontinued production with limited remaining inventory. Obsolete status indicates production has ended and parts are no longer available from the manufacturer. For new designs, Active status parts are preferred to ensure long-term component availability and supply chain stability.

Q5: Can Rohm Semiconductor parts (BA10324AF-E2, BA2902F-E2) replace LM224AD?

Rohm parts are functional alternatives with 4-circuit, 14-SOIC configuration and Active product status. However, both parts operate at 500 kHz bandwidth and 0.2 V/µs slew rate, representing 58% lower bandwidth and 60% lower slew rate compared to LM224AD. These parts are suitable for applications with reduced bandwidth requirements. BA2902F-E2 supports extended operating temperature range (-40°C to 125°C), which may be advantageous for industrial applications.

Q6: What packaging formats are available, and do they affect electrical performance?

Available packaging formats include Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). These formats differ only in physical delivery and handling characteristics and do not affect electrical performance. Selection should be based on manufacturing process requirements (manual assembly typically uses Tube; automated assembly uses Cut Tape or Tape & Reel).

Q7: Are all substitute parts ROHS3 compliant?

Yes. All substitute parts listed carry ROHS3 compliance certification, matching the LM224AD compliance status. All parts also carry REACH Unaffected status and are classified as EAR99 for export control purposes.

Q8: What is the significance of Moisture Sensitivity Level (MSL)?

All listed parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions. Parts can be stored and handled under standard conditions without special moisture control measures.

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