LM224KADRG4 Equivalent & Substitute Parts

Part Overview

The LM224KADRG4 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 part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement continuity. The LM224KADRG4 operates across a supply voltage range of 3V to 30V with a gain bandwidth product of 1.2 MHz and slew rate of 0.5V/µs, making it suitable for general-purpose amplification applications requiring moderate bandwidth performance.

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 of the LM224KADRG4 is determined by strict electrical and mechanical parameter compatibility within the general-purpose operational amplifier category. The critical parameters governing substitution are:

Electrical Compatibility Criteria:

Number of circuits: 4 (all substitutes must provide 4 independent amplifier circuits)
Supply voltage range: Minimum 3V, Maximum ≥30V
Gain bandwidth product: 1.2 MHz or higher
Slew rate: 0.5V/µs or higher
Output current per channel: ≥30 mA
Input bias current: ≤15 nA (lower values acceptable)
Input offset voltage: ≤2 mV

Mechanical Compatibility Criteria:

Package type: 14-SOIC surface mount
Package width: 0.154" (3.90mm) or equivalent 14-SOIC standard
Mounting type: Surface mount

Compliance Criteria:

RoHS3 compliance required
Moisture sensitivity level: 1 (Unlimited)

Substitutes are grouped into two categories: Direct Replacements (identical electrical and mechanical specifications with active product status) and Functional Equivalents (meeting all electrical and mechanical parameters with potential minor variations in secondary characteristics such as slew rate or supply current).

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Current (mA)	Output Current (mA)	Supply Span (V)	Temp Range (°C)	Package
LM224KADRG4	Texas Instruments	Obsolete	0.5	1.2	15	1.4	30	3–30	-25 to 85	14-SOIC
LM224KADR	Texas Instruments	Active	0.5	1.2	15	1.4	30	3–30	-25 to 85	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1.0	30	3–32	-40 to 125	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	3–32	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	0.085	10	3–32	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	0.085	10	3–32	0 to 70	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.6	35	3–32	-40 to 85	14-SOIC
BA2902F-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.7	30	3–32	-40 to 125	14-SOIC

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Recommended Primary Choice):

The LM224KADR (Texas Instruments, Active) is the direct equivalent to the LM224KADRG4. This part maintains identical electrical specifications (0.5V/µs slew rate, 1.2 MHz gain bandwidth product, 15 nA input bias current, 30 mA output current per channel) and identical mechanical packaging (14-SOIC, 3.90mm width). The only difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard). This part is suitable for direct substitution in all applications where the LM224KADRG4 was originally specified. Inventory availability is 2982 pieces.

Tier 2 – Functional Equivalents (Active Status, Compatible Electrical Performance):

The LM324 series (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB) from Texas Instruments are active general-purpose 4-circuit operational amplifiers in 14-SOIC packaging. These parts meet the mechanical compatibility requirement and provide extended supply voltage range (3V–32V vs. 3V–30V). However, they exhibit lower gain bandwidth product (1.0 MHz vs. 1.2 MHz) and higher input bias current (45 nA vs. 15 nA). These parts are suitable for applications where the reduced bandwidth and higher input bias current are acceptable. All LM324 variants are RoHS3 compliant with MSL 1 rating.

Tier 3 – Low-Power Alternatives (Specialized Applications):

The LP324 series (LP324M/NOPB, LP324MX/NOPB) from Texas Instruments are low-power variants with significantly reduced supply current (85 µA vs. 1.4 mA) and lower output current capability (10 mA vs. 30 mA). These parts are suitable only for applications where power consumption is critical and output current requirements do not exceed 10 mA per channel. Gain bandwidth product is 100 kHz, substantially lower than the LM224KADRG4.

Tier 4 – Alternative Manufacturers (Rohm Semiconductor):

The BA10324AF-E2 and BA2902F-E2 from Rohm Semiconductor are general-purpose 4-circuit operational amplifiers in 14-SOIC packaging. Both parts meet mechanical compatibility and provide extended operating temperature ranges (-40°C to 85°C or -40°C to 125°C). However, both exhibit reduced gain bandwidth product (500 kHz vs. 1.2 MHz) and reduced slew rate (0.2V/µs vs. 0.5V/µs). These parts are suitable for applications where the reduced bandwidth is acceptable and extended temperature operation is required.

All recommended substitutes are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original LM224KADRG4.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LM224KADRG4 with LM224KADR?

A: Yes. The LM224KADR is the direct equivalent with identical electrical specifications and 14-SOIC mechanical packaging. The only difference is that LM224KADR is active (vs. obsolete) and supplied in Tape & Reel format. This is the recommended primary choice for substitution.

Q2: What is the key difference between LM224KADRG4 and LM324 series parts?

A: The LM224KADRG4 has a gain bandwidth product of 1.2 MHz and input bias current of 15 nA. The LM324 series has a gain bandwidth product of 1.0 MHz and input bias current of 45 nA. Both are 4-circuit general-purpose operational amplifiers in 14-SOIC packaging. The LM324 series is suitable for applications where the reduced bandwidth and higher input bias current are acceptable.

Q3: Can I use LP324 series as a substitute for LM224KADRG4?

A: The LP324 series is not recommended as a general substitute. While mechanically compatible (14-SOIC packaging), the LP324 has significantly lower output current capability (10 mA vs. 30 mA per channel), lower supply current (85 µA vs. 1.4 mA), and much lower gain bandwidth product (100 kHz vs. 1.2 MHz). Use LP324 only in applications where power consumption is critical and output current requirements do not exceed 10 mA per channel.

Q4: Are Rohm Semiconductor parts (BA10324AF-E2, BA2902F-E2) suitable substitutes?

A: Rohm parts are mechanically compatible (14-SOIC packaging) and provide extended operating temperature ranges. However, both exhibit reduced gain bandwidth product (500 kHz vs. 1.2 MHz) and reduced slew rate (0.2V/µs vs. 0.5V/µs). These parts are suitable only for applications where reduced bandwidth performance is acceptable and extended temperature operation (-40°C to 85°C or -40°C to 125°C) is required.

Q5: What packaging formats are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube. The mechanical package type (14-SOIC) remains consistent across all substitutes. Verify packaging format compatibility with your procurement and assembly processes before selection.

Q6: Do all substitute parts meet RoHS3 compliance?

A: Yes. All recommended substitute parts are RoHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the original LM224KADRG4.

Q7: What is the operating temperature range difference between LM224KADRG4 and substitutes?

A: The LM224KADRG4 operates from -25°C to 85°C. The LM324 series operates from 0°C to 70°C (narrower range). The Rohm BA10324AF-E2 operates from -40°C to 85°C, and BA2902F-E2 operates from -40°C to 125°C (extended ranges). Select based on your application's temperature requirements.

Q8: Which substitute has the highest output current capability?

A: The LM324 series (LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB) provides 40 mA output current per channel, which exceeds the LM224KADRG4's 30 mA specification. All other substitutes provide 30 mA or lower output current.

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