LM224D Equivalent & Substitute Parts

Part Overview

The LM224D is a general-purpose operational amplifier manufactured by Texas Instruments, featuring four independent circuits in a 14-SOIC surface-mount package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory (4495 pcs). The LM224D operates across a wide supply voltage range (3V to 30V) and temperature range (-25°C to 85°C), making it suitable for analog signal processing applications requiring moderate bandwidth and low input bias current.

Substitute parts are necessary due to the Last Time Buy status of the LM224D. Alternative components with equivalent electrical characteristics and compatible packaging enable continued system design and production without redesign constraints.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1.2	MHz
Slew Rate	0.5	V/µs
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	—

Substitute Part Grouping Explanation

Substitution of the LM224D is determined by strict equivalence in the following critical parameters:

Mandatory Equivalence Criteria:

Number of circuits: 4 independent amplifier stages
Package type: 14-SOIC surface-mount configuration with 0.154" (3.90mm) width
Gain bandwidth product: 1.2 MHz (or lower for reduced-bandwidth applications)
Supply voltage range: Minimum 3V, maximum ≥30V
Current output per channel: ≥40 mA
Input bias current: ≤20 nA (or higher for less stringent applications)
RoHS3 compliance and MSL Level 1 rating

Substitution Logic: Parts are grouped into three categories based on functional equivalence and product status:

Direct Functional Equivalents (Active Status): Parts with identical or superior electrical specifications and active manufacturing status
Compatible Alternatives (Active Status): Parts with acceptable parameter variations within application tolerance
Legacy Equivalents (Obsolete Status): Parts with equivalent specifications but discontinued production

Parameter Comparison

Part Number	Manufacturer	Product Status	GBW (MHz)	Slew Rate (V/µs)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
LM224D	Texas Instruments	Last Time Buy	1.2	0.5	20	3	1.4	40	-25 to 85	14-SOIC
LM224DR2G	onsemi	Active	1	—	90	2	—	40	-25 to 85	14-SOIC
LM224DR	UMW	Active	1.2	0.5	20	3	0.7	30	-20 to 85	14-SOP
LM324AM/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	1	—	45	2	1.5	40	0 to 70	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	1.2	0.3	20	1	1	30	-40 to 125	14-SOPJ
LP324M/NOPB	Texas Instruments	Active	0.1	0.05	2	2	0.085	10	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.1	0.05	2	2	0.085	10	0 to 70	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.5	0.2	20	2	0.6	35	-40 to 85	14-SOP

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM224DR2G (onsemi) is the direct functional equivalent with identical temperature range (-25°C to 85°C) and output current rating (40 mA). This part maintains the same base product number (LM224) and is in active production status with high inventory availability (105200 pcs). The 14-SOIC package is pin-compatible with the LM224D.

LM224DR (UMW) provides equivalent gain-bandwidth product (1.2 MHz) and slew rate (0.5 V/µs) with reduced supply current (0.7 mA vs. 1.4 mA). Operating temperature range is slightly narrower (-20°C to 85°C). This part is actively manufactured with substantial inventory (105100 pcs).

Secondary Substitutes (Acceptable for Reduced-Performance Applications):

LM324 series parts (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB) from Texas Instruments are active production alternatives with identical output current (40 mA) and compatible 14-SOIC packaging. These parts operate at reduced gain-bandwidth product (1 MHz vs. 1.2 MHz) and narrower temperature range (0°C to 70°C). Selection is appropriate for applications not requiring extended low-temperature operation below 0°C or the full 1.2 MHz bandwidth.

Specialized Alternatives:

LP324M/NOPB and LP324MX/NOPB are low-power variants with significantly reduced supply current (85 µA) and output current (10 mA). These are suitable only for applications with reduced output drive requirements and lower bandwidth tolerance (100 kHz).

BA10324AF-E2 (Rohm Semiconductor) offers extended temperature range (-40°C to 85°C) with reduced bandwidth (500 kHz) and output current (35 mA). Package width is 0.173" (4.40mm), requiring PCB layout verification for compatibility.

Compliance Status:

All listed substitutes maintain ROHS3 compliance and MSL Level 1 rating, consistent with the LM224D. All parts carry EAR99 ECCN classification and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can LM324 series parts directly replace LM224D in all applications?

A: LM324 series parts are functionally compatible for applications operating within 0°C to 70°C temperature range. The LM224D supports extended operation to -25°C. If your application requires operation below 0°C, LM224DR2G or LM224DR are required. Gain-bandwidth product is reduced from 1.2 MHz to 1 MHz in LM324 variants; verify this meets your frequency response requirements.

Q: What is the difference between 14-SOIC and 14-SOP packaging?

A: Both are 14-pin surface-mount packages with identical pin pitch and electrical connectivity. The primary difference is physical body width: 14-SOIC is 0.154" (3.90mm) wide, while 14-SOP variants may be 0.173" (4.40mm) or other dimensions. Verify PCB footprint compatibility before substitution. Pin assignments are identical across these package types.

Q: Is LM2902DR a suitable substitute despite Obsolete status?

A: LM2902DR is electrically compatible with equivalent 1.2 MHz gain-bandwidth product and 20 nA input bias current. However, Obsolete status indicates discontinued production. This part should be used only if existing inventory is available and long-term supply is not required. For new designs, select active production alternatives such as LM224DR2G or LM324 series.

Q: Why do some substitutes show lower output current ratings?

A: Output current capability is application-dependent. The LM224D provides 40 mA per channel. LP324 series provides only 10 mA, suitable for high-impedance loads. BA10324AF-E2 provides 35 mA. Select based on your load impedance and required output drive capability. Exceeding rated output current causes device damage.

Q: Can I use LP324 variants for audio or signal conditioning applications?

A: LP324 variants are low-power, low-bandwidth devices (100 kHz gain-bandwidth product, 0.05 V/µs slew rate). These are suitable only for DC and very low-frequency signal conditioning. For audio or general-purpose signal processing requiring 1.2 MHz bandwidth, use LM224DR2G, LM224DR, or LM324 series instead.

Q: What supply voltage range should I verify for my application?

A: The LM224D operates from 3V to 30V. LM224DR2G and LM224DR support 3V to 32V. LM324 series supports 3V to 32V. LP324 variants support 3V to 32V. If your design uses supply voltages above 30V, confirm the selected substitute supports your specific voltage before implementation.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the LM224D compliance profile. No additional qualification is required for RoHS or moisture sensitivity.

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