LM324AD Equivalent & Substitute Parts

Part Overview

The LM324AD 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 LM324AD serves applications requiring low-cost, general-purpose amplification across industrial, consumer, and automotive signal conditioning circuits. Due to its Last Time Buy status, identifying functionally compatible substitute parts is essential for design continuity and long-term supply chain planning.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.5	V/µs
Gain Bandwidth Product	1.3	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

Substitute parts for the LM324AD are evaluated based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Number of Circuits: Must be 4 (quad configuration)
Package / Case: Must be 14-SOIC with 0.154" (3.90mm) width for PCB layout compatibility
Mounting Type: Must be Surface Mount
Voltage - Supply Span: Minimum 3V and maximum ≥30V to support existing power supply designs
Current - Output / Channel: Must be ≥30 mA to maintain load-driving capability
RoHS Status: Must be ROHS3 Compliant for regulatory alignment

Secondary Performance Parameters:

Slew Rate, Gain Bandwidth Product, Input Bias Current, and Input Offset Voltage determine performance characteristics but allow substitution when primary criteria are met
Operating Temperature range may vary; substitutes with extended temperature ranges provide additional design margin

Substitute parts are grouped into two categories: Direct Manufacturer Alternatives (same base product number LM324 from different manufacturers or packaging variants) and Cross-Manufacturer Equivalents (functionally compatible devices from alternative manufacturers meeting all primary criteria).

Parameter Comparison

Parameter	LM324AD (Main)	LM324ADR (UMW)	LM2902DR (Rohm)	LM324AM/NOPB (TI)	LM324AMX/NOPB (TI)	LM324M/NOPB (TI)	LM324MX/NOPB (TI)	LP324M/NOPB (TI)	LP324MX/NOPB (TI)	LM324ADR2G (onsemi)	BA10324AF-E2 (Rohm)
Manufacturer	Texas Instruments	UMW	Rohm Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Rohm Semiconductor
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Slew Rate (V/µs)	0.5	—	0.3	—	—	—	—	0.05	0.05	—	0.2
Gain Bandwidth Product (MHz)	1.3	—	1.2	1	1	1	1	0.1	0.1	1	0.5
Current - Input Bias (nA)	15	20	20	45	45	45	45	2	2	40	20
Voltage - Input Offset (mV)	2	2	1	2	2	2	2	2	2	2	2
Current - Supply (mA)	1.4	1.1	1	1.5	1.5	1.5	1.5	0.085	0.085	1.5	0.6
Current - Output / Channel (mA)	30	30	30	40	40	40	40	10	10	40	35
Voltage - Supply Span (Min)	3 V	—	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	30 V	30 V	32 V	32 V	32 V	32 V	32 V	32 V	32 V	32 V	32 V
Operating Temperature (°C)	0 to 70	-30 to 85	-40 to 125	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 85
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.173", 4.40mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Highest Compatibility):

LM324ADR (UMW), LM324AM/NOPB (Texas Instruments), LM324AMX/NOPB (Texas Instruments), LM324M/NOPB (Texas Instruments), and LM324MX/NOPB (Texas Instruments) are direct substitutes sharing the LM324 base product number. These devices maintain identical quad-channel configuration, 14-SOIC packaging, and supply voltage specifications. All are ROHS3 Compliant with MSL 1 rating. LM324ADR2G (onsemi) provides equivalent performance with extended supply voltage range (32V maximum) and higher output current capability (40 mA per channel). All Tier 1 substitutes are Active status products with established supply chains.

Tier 2 - Functional Equivalents (Compatible with Design Verification):

LM2902DR (Rohm Semiconductor) meets primary substitution criteria with 4-circuit configuration, 14-SOIC packaging, and 3V to 32V supply range. This device is classified as Obsolete; however, it maintains ROHS3 Compliance and MSL 1 rating. Performance parameters differ: Slew Rate 0.3V/µs (versus 0.5V/µs), Gain Bandwidth Product 1.2 MHz (versus 1.3 MHz), and Input Offset Voltage 1 mV (superior to 2 mV). Extended operating temperature range (-40°C to 125°C) provides thermal margin beyond the LM324AD specification.

BA10324AF-E2 (Rohm Semiconductor) is an Active product meeting all primary substitution criteria. Package width differs at 0.173" (4.40mm) versus 0.154" (3.90mm); PCB layout verification is required. Performance characteristics include lower Slew Rate (0.2V/µs), reduced Gain Bandwidth Product (500 kHz), and lower supply current (600µA). Output current per channel (35 mA) exceeds LM324AD minimum requirement (30 mA).

Tier 3 - Low-Power Alternatives (Application-Specific):

LP324M/NOPB and LP324MX/NOPB (Texas Instruments) are Active products with significantly reduced power consumption (85µA supply current versus 1.4 mA). These devices are suitable only for applications where bandwidth and slew rate requirements are relaxed (100 kHz Gain Bandwidth Product, 0.05V/µs Slew Rate). Output current per channel is limited to 10 mA, restricting load-driving capability. These substitutes are appropriate for low-power signal conditioning and sensor interface applications only.

Compliance and Certification:

All recommended substitutes maintain ROHS3 Compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and storage conditions. REACH Status is Unaffected across all alternatives. ECCN classification (EAR99) and HTSUS code (8542.33.0001) remain consistent, supporting regulatory and trade documentation requirements.

Frequently Asked Questions (FAQ)

Q1: Can LM324ADR (UMW) directly replace LM324AD in existing designs without PCB modification?

A: Yes. LM324ADR maintains identical 14-SOIC (0.154", 3.90mm) packaging, pin configuration, and electrical specifications. No PCB layout changes are required. Both devices are ROHS3 Compliant with MSL 1 rating and support 3V to 30V supply operation.

Q2: What is the primary difference between LM324AM/NOPB and LM324AMX/NOPB?

A: Both devices are electrically identical Texas Instruments LM324 variants with 1 MHz Gain Bandwidth Product and 45 nA Input Bias Current. The difference is packaging format: LM324AM/NOPB is supplied in Tube packaging, while LM324AMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on assembly process requirements and quantity needs.

Q3: Why is LM2902DR listed as Obsolete, and can it still be used?

A: LM2902DR is classified as Obsolete by Rohm Semiconductor, indicating discontinued production. However, inventory remains available (90,223 pcs). The device meets all primary substitution criteria and maintains ROHS3 Compliance. Use is acceptable for new designs if supply continuity can be confirmed with distributors. Extended operating temperature range (-40°C to 125°C) provides additional design margin compared to LM324AD.

Q4: Is BA10324AF-E2 compatible with LM324AD despite different package width?

A: BA10324AF-E2 has 14-SOIC packaging with 0.173" (4.40mm) width, compared to LM324AD at 0.154" (3.90mm). Pin pitch and electrical specifications are compatible; however, PCB footprint verification is mandatory. The wider package may not fit existing PCB layouts designed for standard 0.154" width. Electrical performance is acceptable: 35 mA output current per channel exceeds the 30 mA requirement, and 32V maximum supply voltage accommodates existing designs.

Q5: When should LP324M/NOPB or LP324MX/NOPB be selected instead of standard LM324 variants?

A: LP324 series devices are appropriate only for applications where power consumption is critical and performance requirements are relaxed. The 100 kHz Gain Bandwidth Product and 0.05V/µs Slew Rate limit use to low-frequency signal conditioning, sensor interfaces, and precision measurement circuits. The 10 mA output current per channel cannot drive standard logic loads or high-impedance circuits requiring 30+ mA. Standard LM324 variants are recommended for general-purpose applications.

Q6: What is the impact of different Input Bias Current specifications across substitute parts?

A: LM324AD specifies 15 nA Input Bias Current. Substitutes range from 2 nA (LP324 series) to 45 nA (LM324AM/NOPB variants). Higher Input Bias Current increases input offset voltage drift and reduces input impedance, affecting precision analog circuits. For general-purpose applications with input impedances below 1 MΩ, differences are negligible. High-impedance sensor interfaces (>10 MΩ) should prioritize LP324 series (2 nA) or LM324ADR (20 nA) to minimize bias current errors.

Q7: Are all substitute parts suitable for automotive or industrial temperature ranges?

A: LM324AD operates 0°C to 70°C. Extended-temperature substitutes include LM324ADR (-30°C to 85°C), LM2902DR (-40°C to 125°C), and BA10324AF-E2 (-40°C to 85°C). For automotive applications requiring -40°C to 125°C operation, LM2902DR is the only option. For industrial applications (-30°C to 85°C), LM324ADR or BA10324AF-E2 are suitable. Standard LM324 variants (0°C to 70°C) are limited to commercial temperature range applications.

Q8: How do packaging format differences (Tube, Cut Tape, Tape & Reel) affect component selection?

A: Packaging format does not affect electrical performance or PCB compatibility. Selection depends on assembly process: Tube packaging suits low-volume manual assembly; Cut Tape (CT) & Digi-Reel® format supports semi-automated pick-and-place systems; Tape & Reel (TR) format is optimized for high-volume automated assembly. All formats maintain identical component specifications and ROHS3 Compliance.

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