LM224KAD Equivalent & Substitute Parts

Part Overview

The LM224KAD 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 inventory availability. The LM224KAD 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. Alternative equivalent parts are necessary due to product status transition and to ensure long-term design continuity and supply chain reliability.

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 compatibility for the LM224KAD is determined by the following critical parameters: amplifier type (general purpose), number of circuits (4), package type (14-SOIC surface mount), supply voltage range compatibility, and electrical performance specifications including slew rate, gain bandwidth product, input bias current, and output current capability.

Substitute parts are grouped into two categories:

Category 1: Direct Packaging Equivalents (14-SOIC) Parts that maintain identical or compatible 14-SOIC packaging with matching electrical performance within acceptable tolerances. These include LM224KADR (Tape & Reel variant), LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB, LP324M/NOPB, and LP324MX/NOPB.

Category 2: Alternative Package Variants (14-SOP) Parts that provide equivalent electrical functionality but use alternative surface mount packaging (14-SOP with 0.173" width). These include BA10324AF-E2 and BA2902F-E2 from Rohm Semiconductor, and LM2902DR.

Substitution logic is based strictly on: (1) matching number of circuits (4), (2) compatible supply voltage ranges, (3) acceptable electrical parameter ranges for the application, (4) surface mount mounting type, and (5) RoHS3 compliance and MSL Level 1 certification.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Current (mA)	Output Current (mA)	Voltage Supply Min-Max (V)	Temp Range (°C)	Package	Status
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
LM324AM/NOPB	Texas Instruments	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC	Active
LM324AMX/NOPB	Texas Instruments	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC	Active
LM324M/NOPB	Texas Instruments	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC	Active
LM324MX/NOPB	Texas Instruments	—	1.0	45	1.5	40	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
LP324MX/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	1.0	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-SOP	Active
BA2902F-E2	Rohm Semiconductor	0.2	0.5	20	0.7	30	3–32	-40 to 125	14-SOP	Active

Engineering Selection Recommendations

Primary Recommendation: LM224KADR

The LM224KADR is the direct equivalent of LM224KAD, manufactured by Texas Instruments with identical electrical specifications and 14-SOIC packaging. This part maintains Active product status, ensuring continued availability and supply chain stability. The only difference is packaging format (Tape & Reel versus Tube), which does not affect electrical performance or PCB compatibility. This part is recommended for direct replacement in new designs and production transitions.

Secondary Recommendation: LM324AMX/NOPB or LM324AM/NOPB

The LM324 series (LM324AMX/NOPB in Cut Tape format or LM324AM/NOPB in Tube format) represents an active, widely available alternative from Texas Instruments. These parts share the same 14-SOIC package and general-purpose amplifier architecture. Electrical differences include lower slew rate specification (not provided), lower gain bandwidth product (1.0 MHz versus 1.2 MHz), higher input bias current (45 nA versus 15 nA), and extended supply voltage range to 32V. These parts are suitable for applications where the lower bandwidth and higher input bias current are acceptable. Operating temperature range is 0°C to 70°C, which is narrower than the LM224KAD.

Tertiary Recommendation: LP324M/NOPB or LP324MX/NOPB

The LP324 series (low-power variant) offers significantly reduced power consumption (85µA supply current versus 1.4mA) and lower input bias current (2 nA). These parts are suitable only for applications where bandwidth requirements are minimal (100 kHz gain bandwidth product) and output current demands are low (10 mA per channel). These parts are not recommended as direct replacements for bandwidth-critical applications.

Alternative Package Option: BA10324AF-E2 or BA2902F-E2

Rohm Semiconductor parts BA10324AF-E2 and BA2902F-E2 provide equivalent functionality in 14-SOP packaging (0.173" width versus 0.154" for SOIC). These parts are suitable only if PCB layout can accommodate the slightly wider package footprint. BA2902F-E2 offers extended operating temperature range (-40°C to 125°C) and is currently Active. LM2902DR from Rohm is Obsolete and not recommended for new designs.

Compliance Verification

All recommended substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and EAR99 export classification, matching the original LM224KAD specifications.

Frequently Asked Questions (FAQ)

Q1: Can LM224KADR be used as a direct replacement for LM224KAD?

A: Yes. LM224KADR is electrically and functionally identical to LM224KAD. The only difference is packaging format: LM224KADR is supplied in Tape & Reel format while LM224KAD is supplied in Tube format. Both use 14-SOIC surface mount packaging with identical pinout and electrical performance. PCB compatibility is complete.

Q2: What are the key differences between LM224KAD and LM324AMX/NOPB?

A: The primary differences are: (1) Gain Bandwidth Product: LM224KAD is 1.2 MHz versus LM324AMX/NOPB at 1.0 MHz; (2) Input Bias Current: LM224KAD is 15 nA versus LM324AMX/NOPB at 45 nA; (3) Supply Current: LM224KAD is 1.4 mA versus LM324AMX/NOPB at 1.5 mA; (4) Operating Temperature: LM224KAD is -25°C to 85°C versus LM324AMX/NOPB at 0°C to 70°C; (5) Maximum Supply Voltage: LM224KAD is 30V versus LM324AMX/NOPB at 32V. Both use 14-SOIC packaging and are pin-compatible.

Q3: Why is LP324M/NOPB not recommended as a direct replacement?

A: LP324M/NOPB is a low-power variant with significantly different electrical specifications. Gain Bandwidth Product is 100 kHz (versus 1.2 MHz for LM224KAD), output current per channel is 10 mA (versus 30 mA), and supply current is 85 µA (versus 1.4 mA). This part is suitable only for low-bandwidth, low-power applications and will not function correctly in circuits designed for the LM224KAD's performance level.

Q4: Can BA10324AF-E2 or BA2902F-E2 be used as substitutes?

A: These Rohm Semiconductor parts can be used only if PCB layout modifications are acceptable. The package is 14-SOP with 0.173" width versus 14-SOIC with 0.154" width for the LM224KAD. Electrical specifications differ: slew rate is 0.2 V/µs (versus 0.5 V/µs), gain bandwidth product is 500 kHz (versus 1.2 MHz), and supply current is 600–700 µA (versus 1.4 mA). These parts are suitable for lower-bandwidth applications only.

Q5: What is the product status significance of LM224KAD?

A: LM224KAD is classified as Last Time Buy, indicating Texas Instruments has discontinued production. Existing inventory is limited (2,980 pieces noted). For new designs and long-term production, LM224KADR (Active status) or LM324 series alternatives (Active status) are recommended to ensure supply chain continuity.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LM224KAD specifications. All parts are suitable for lead-free soldering processes.

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

A: BA2902F-E2 and LM2902DR both offer -40°C to 125°C operating temperature range, which is wider than LM224KAD (-25°C to 85°C). However, LM2902DR is Obsolete and not recommended. BA2902F-E2 is Active but uses 14-SOP packaging requiring PCB layout modification.

Q8: What is the difference between LM324AMX/NOPB and LM324AM/NOPB?

A: Both parts have identical electrical specifications. The difference is packaging format: LM324AMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format, while LM324AM/NOPB is supplied in Tube format. Both use 14-SOIC surface mount packaging. Selection depends on assembly process requirements and tape reel compatibility.

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