LM324KADRG4 Equivalent & Substitute Parts

Part Overview

The LM324KADRG4 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 alternative components that maintain electrical and mechanical compatibility for ongoing production and maintenance applications.

The LM324KADRG4 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 circuits 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	0 to 70	°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 LM324KADRG4 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 4 channels
Package type: 14-SOIC surface mount
Supply voltage range: Minimum 3V, Maximum ≥30V
Gain bandwidth product: 1.2 MHz or higher
Slew rate: 0.5V/µs or higher
Current output per channel: ≥30 mA
Input bias current: ≤15 nA
Input offset voltage: ≤2 mV
RoHS3 compliance and MSL Level 1

Substitution Groups:

Group 1: Direct Texas Instruments LM324 Series (Active Status) Parts LM324KADR, LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB maintain the LM324 base product number with identical electrical specifications and 14-SOIC packaging. These differ only in packaging format (Tape & Reel, Tube, or Cut Tape) and product status (Active vs. Obsolete).

Group 2: Low-Power Texas Instruments LP324 Series (Active Status) Parts LP324M/NOPB and LP324MX/NOPB are low-power variants of the LM324 base product. These maintain 14-SOIC packaging and supply voltage compatibility but feature reduced gain bandwidth product (100 kHz), lower slew rate (0.05V/µs), significantly lower supply current (85µA), and reduced output current per channel (10 mA).

Group 3: Rohm Semiconductor Alternatives (Active Status) Parts BA10324AF-E2 and BA2902F-E2 are Rohm Semiconductor general-purpose 4-circuit operational amplifiers in 14-SOP packaging. These maintain 4-circuit configuration and supply voltage compatibility but feature reduced gain bandwidth product (500 kHz), lower slew rate (0.2V/µs), and different package dimensions (0.173" vs. 0.154" width).

Group 4: Rohm Semiconductor LM2902 Series (Obsolete Status) Part LM2902DR is a Rohm Semiconductor equivalent with 4-circuit configuration and 14-SOIC packaging. This part features reduced slew rate (0.3V/µs), higher input bias current (20 nA), and extended operating temperature range (-40°C to 125°C) but maintains 1.2 MHz gain bandwidth product.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
LM324KADRG4	Texas Instruments	Obsolete	0.5	1.2	15	1.4	30	0 to 70	14-SOIC
LM324KADR	Texas Instruments	Active	0.5	1.2	15	1.4	30	0 to 70	14-SOIC
LM324AM/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	0 to 70	14-SOIC
LM324AMX/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	0 to 70	14-SOIC
LM324M/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	0 to 70	14-SOIC
LM324MX/NOPB	Texas Instruments	Active	—	1.0	45	1.5	40	0 to 70	14-SOIC
LP324M/NOPB	Texas Instruments	Active	0.05	0.1	2	0.085	10	0 to 70	14-SOIC
LP324MX/NOPB	Texas Instruments	Active	0.05	0.1	2	0.085	10	0 to 70	14-SOIC
LM2902DR	Rohm Semiconductor	Obsolete	0.3	1.2	20	1.0	30	-40 to 125	14-SOIC
BA10324AF-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.6	35	-40 to 85	14-SOP
BA2902F-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.7	30	-40 to 125	14-SOP

Engineering Selection Recommendations

Recommended Primary Substitutes (Highest Compatibility):

LM324KADR — Texas Instruments, Active Status
- Identical electrical specifications to LM324KADRG4
- Same 14-SOIC package and pin configuration
- Differs only in packaging format (Tape & Reel vs. Tube)
- ROHS3 compliant, MSL Level 1
- Highest inventory availability (1900 pcs)
LM324MX/NOPB — Texas Instruments, Active Status
- Texas Instruments LM324 series, Active product status
- Identical 14-SOIC package and pin configuration
- Gain bandwidth product 1.0 MHz (meets minimum requirement)
- Output current per channel 40 mA (exceeds 30 mA requirement)
- ROHS3 compliant, MSL Level 1
- High inventory availability (50,513 pcs)
LM324AMX/NOPB — Texas Instruments, Active Status
- Texas Instruments LM324 series, Active product status
- Identical 14-SOIC package and pin configuration
- Gain bandwidth product 1.0 MHz (meets minimum requirement)
- Output current per channel 40 mA (exceeds 30 mA requirement)
- ROHS3 compliant, MSL Level 1
- High inventory availability (36,756 pcs)

Secondary Substitutes (Conditional Application):

LP324MX/NOPB — Texas Instruments, Active Status
- Suitable only for applications where reduced bandwidth (100 kHz) and slew rate (0.05V/µs) are acceptable
- Significantly lower supply current (85µA) and output current (10 mA) limit applicability
- ROHS3 compliant, MSL Level 1
- High inventory availability (23,900 pcs)
LM2902DR — Rohm Semiconductor, Obsolete Status
- Maintains 1.2 MHz gain bandwidth product and 14-SOIC package
- Reduced slew rate (0.3V/µs) and higher input bias current (20 nA)
- Extended operating temperature range (-40°C to 125°C)
- ROHS3 compliant, MSL Level 1
- Not recommended due to obsolete status

Not Recommended:

BA10324AF-E2 and BA2902F-E2 — Rohm Semiconductor, Active Status
- Package dimensions differ (0.173" vs. 0.154" width)
- Reduced gain bandwidth product (500 kHz) and slew rate (0.2V/µs)
- Lower supply current (600-700µA) and reduced output current (30-35 mA)
- Physical package incompatibility with existing PCB layouts

Frequently Asked Questions (FAQ)

Q1: Can LM324KADRG4 be directly replaced with LM324KADR?

A: Yes. LM324KADR is the direct equivalent with identical electrical specifications and 14-SOIC packaging. The only difference is packaging format (Tape & Reel vs. Tube). Both are ROHS3 compliant with MSL Level 1. LM324KADR is active status, making it the preferred replacement for obsolete LM324KADRG4.

Q2: What is the difference between LM324KADRG4 and LM324MX/NOPB?

A: Both are 4-circuit general-purpose operational amplifiers in 14-SOIC packaging with identical pin configuration. LM324MX/NOPB has slightly lower gain bandwidth product (1.0 MHz vs. 1.2 MHz) and higher input bias current (45 nA vs. 15 nA), but higher output current per channel (40 mA vs. 30 mA). LM324MX/NOPB is active status with higher inventory availability.

Q3: Why are LP324M/NOPB and LP324MX/NOPB not recommended as direct substitutes?

A: LP324 series are low-power variants with significantly reduced performance specifications. Gain bandwidth product is 100 kHz (vs. 1.2 MHz), slew rate is 0.05V/µs (vs. 0.5V/µs), and output current per channel is 10 mA (vs. 30 mA). These parts are suitable only for applications with relaxed bandwidth and output current requirements.

Q4: Can Rohm Semiconductor BA10324AF-E2 or BA2902F-E2 replace LM324KADRG4?

A: Physical package incompatibility prevents direct replacement. BA10324AF-E2 and BA2902F-E2 use 14-SOP packaging with 0.173" width, while LM324KADRG4 uses 14-SOIC with 0.154" width. Additionally, these parts feature reduced gain bandwidth product (500 kHz) and slew rate (0.2V/µs), making them unsuitable for applications requiring 1.2 MHz bandwidth.

Q5: What does "obsolete" product status mean for LM324KADRG4?

A: Obsolete status indicates the manufacturer has discontinued production and support for this specific part number. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. Active alternative part numbers such as LM324KADR, LM324MX/NOPB, or LM324AMX/NOPB should be used for new designs and ongoing production.

Q6: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of LM324KADRG4.

Q7: What is the significance of packaging format differences (Tube, Tape & Reel, Cut Tape)?

A: Packaging format affects handling, storage, and automated assembly processes but does not alter electrical specifications or pin configuration. Tube packaging is suitable for manual assembly; Tape & Reel and Cut Tape formats are optimized for automated pick-and-place equipment. Selection depends on production methodology, not circuit performance.

Q8: Can LM324KADRG4 operate at supply voltages above 30V?

A: No. The maximum supply voltage specification for LM324KADRG4 is 30V. Operation above this voltage violates device specifications and may cause permanent damage. Substitute parts LM324KADR, LM324MX/NOPB, and LM324AMX/NOPB maintain the same 30V maximum specification. LM2902DR and Rohm parts support up to 32V.

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