LM224DG4 Equivalent & Substitute Parts

Part Overview

The LM224DG4 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 device is classified as Last Time Buy, indicating discontinued production with limited availability. The LM224DG4 operates across a wide supply voltage range of 3V to 30V and is suitable for general-purpose amplification applications requiring moderate bandwidth and slew rate performance. Alternative equivalent parts are necessary due to product status constraints and to ensure long-term design sustainability and supply chain continuity.

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	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	-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 LM224DG4 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Number of circuits: 4 channels
Package type: 14-SOIC surface-mount configuration
Gain bandwidth product: 1.2 MHz
Supply voltage range: Minimum 3V, Maximum ≥30V
Input bias current: 20 nA
Output current per channel: 40 mA
RoHS3 compliance and MSL Level 1 rating

Substitute parts are grouped into two categories based on product status and operational characteristics:

Category 1: Active Status Substitutes — Parts with Active product status offering direct functional replacement with enhanced or equivalent performance specifications.

Category 2: Specialized Substitutes — Parts with alternative performance characteristics (such as reduced slew rate or bandwidth) suitable for applications where the LM224DG4 specifications exceed design requirements, enabling cost optimization or power reduction.

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)	Supply Max (V)
LM224DG4	Texas Instruments	Last Time Buy	0.5	1.2	20	3	1.4	40	-25 to 85	30
LM224D	STMicroelectronics	Active	0.4	1.2	20	2	1.5	40	-40 to 105	30
LM224DR	UMW	Active	0.5	1.2	20	3	0.7	30	-20 to 85	32
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1	1.0	30	-40 to 125	32
LM324AM/NOPB	Texas Instruments	Active	—	1.0	45	2	1.5	40	0 to 70	32
LM324AMX/NOPB	Texas Instruments	Active	—	1.0	45	2	1.5	40	0 to 70	32
LM324M/NOPB	Texas Instruments	Active	—	1.0	45	2	1.5	40	0 to 70	32
LM324MX/NOPB	Texas Instruments	Active	—	1.0	45	2	1.5	40	0 to 70	32
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	2	0.085	10	0 to 70	32
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	2	0.085	10	0 to 70	32
LM224DR2G	onsemi	Active	—	1.0	90	2	—	40	-25 to 85	32

Engineering Selection Recommendations

Primary Recommendation: LM224D (STMicroelectronics)

The LM224D is the preferred direct substitute for the LM224DG4. Both devices share identical base product architecture (LM224 series), matching 4-circuit configuration, 1.2 MHz gain bandwidth product, 20 nA input bias current, and 40 mA output current per channel. The LM224D maintains the same 14-SOIC package footprint and supply voltage range (3V to 30V). Product status is Active, ensuring long-term availability. Operating temperature range extends to -40°C to 105°C, providing superior thermal coverage. RoHS3 compliance and MSL Level 1 rating are maintained. Input offset voltage is improved at 2 mV versus 3 mV.

Secondary Recommendation: LM224DR2G (onsemi)

The LM224DR2G provides an alternative from onsemi with Active product status. It maintains the LM224 base product number, 4-circuit configuration, 1.2 MHz bandwidth, and 40 mA output current. The device operates across -25°C to 85°C, matching the original temperature range. Supply voltage maximum extends to 32V. This part is available in Cut Tape & Digi-Reel packaging format. RoHS3 and MSL Level 1 compliance are confirmed.

Alternative for Cost-Optimized Designs: LP324M/NOPB or LP324MX/NOPB (Texas Instruments)

The LP324 series offers significant power consumption reduction (85 µA supply current versus 1.4 mA) and lower input bias current (2 nA). These devices are suitable for battery-powered or low-power applications where the LM224DG4 performance specifications exceed design requirements. Gain bandwidth product is reduced to 100 kHz and output current is limited to 10 mA per channel. Operating temperature range is 0°C to 70°C. Both Tube and Tape & Reel packaging options are available.

Not Recommended: LM2902DR (Rohm Semiconductor)

Although LM2902DR shares the 1.2 MHz bandwidth and 20 nA input bias current, product status is Obsolete. This classification indicates discontinued production and uncertain future availability, creating supply chain risk.

Not Recommended: LM324 Series (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB)

The LM324 series devices operate with reduced gain bandwidth product (1.0 MHz versus 1.2 MHz) and elevated input bias current (45 nA versus 20 nA). Operating temperature range is restricted to 0°C to 70°C, limiting applicability in extended temperature environments. These parts are suitable only when the LM224DG4 specifications are not critical to circuit performance.

Frequently Asked Questions (FAQ)

Q1: Can LM224D directly replace LM224DG4 without circuit modification?

A: Yes. The LM224D is a direct functional replacement. Both devices share identical pin configuration in 14-SOIC packaging, matching electrical specifications for gain bandwidth product (1.2 MHz), input bias current (20 nA), and output current (40 mA per channel). Supply voltage range compatibility is maintained (3V to 30V). No circuit redesign is required.

Q2: What is the primary difference between LM224D and LM224DG4?

A: The LM224D is manufactured by STMicroelectronics with Active product status, while LM224DG4 is a Texas Instruments device classified as Last Time Buy. The LM224D offers extended operating temperature range (-40°C to 105°C versus -25°C to 85°C) and improved input offset voltage specification (2 mV versus 3 mV). Both maintain identical package type and core electrical performance.

Q3: Why are LM324 series devices not recommended as direct substitutes?

A: LM324 series devices operate with reduced gain bandwidth product (1.0 MHz versus 1.2 MHz) and higher input bias current (45 nA versus 20 nA). These parameter differences may affect circuit performance in bandwidth-sensitive or precision applications. LM324 devices are suitable only when design specifications do not require the full performance envelope of the LM224DG4.

Q4: Is the LP324 series suitable for all LM224DG4 applications?

A: No. The LP324 series is optimized for low-power operation with significantly reduced specifications: gain bandwidth product of 100 kHz (versus 1.2 MHz), output current of 10 mA per channel (versus 40 mA), and supply current of 85 µA (versus 1.4 mA). LP324 devices are appropriate only for applications where reduced performance is acceptable and power consumption is a primary design constraint.

Q5: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (standard reel packaging), Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). All substitute devices maintain the 14-SOIC (0.154", 3.90mm width) surface-mount package footprint, ensuring mechanical compatibility with LM224DG4 PCB layouts.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 compliance certification and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory status of the LM224DG4.

Q7: Which substitute part offers the widest operating temperature range?

A: The LM2902DR offers the widest operating temperature range (-40°C to 125°C). However, this device is classified as Obsolete and is not recommended for new designs due to supply chain discontinuation risk.

Q8: Can LM224DR (UMW) be used as a substitute?

A: Yes. The LM224DR maintains the LM224 base product number, 4-circuit configuration, 1.2 MHz bandwidth, and 40 mA output current. However, output current per channel is reduced to 30 mA, and supply current is significantly lower at 700 µA. This device is suitable when reduced output current meets application requirements.

Q9: What is the significance of "Last Time Buy" status for LM224DG4?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of the LM224DG4. Current inventory (999 pcs) represents the final available stock. Designs using this part number must transition to an active substitute to ensure long-term supply availability and design sustainability.

Q10: Are there performance trade-offs when substituting with LM224D?

A: No significant trade-offs exist. The LM224D provides equivalent or improved performance: identical gain bandwidth product (1.2 MHz), matching input bias current (20 nA), improved input offset voltage (2 mV versus 3 mV), and extended operating temperature range (-40°C to 105°C). The LM224D is a superior alternative with no performance degradation.

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