LM324KAD Equivalent & Substitute Parts

Part Overview

The LM324KAD is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LM324KAD operates across a wide supply voltage range (3V to 30V) and is suitable for general analog signal processing applications requiring moderate bandwidth and low input bias current characteristics.

Substitution becomes necessary due to the Last Time Buy status and limited stock (4834 pcs). Alternative parts with equivalent or superior electrical performance and active product status are available to ensure long-term design reliability and supply chain continuity.

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 compatibility for the LM324KAD is determined by the following critical parameters:

Electrical Compatibility Criteria:

Number of circuits: 4 (mandatory)
Package type: 14-SOIC surface mount (mandatory for PCB compatibility)
Supply voltage range: Minimum 3V, Maximum ≥30V
Slew rate: ≥0.5V/µs (or lower for non-critical applications)
Gain bandwidth product: ≥1.2 MHz (or lower for non-critical applications)
Input bias current: ≤15 nA (or higher for non-critical applications)
Output current per channel: ≥30 mA

Compliance & Status Criteria:

RoHS3 compliance (mandatory for regulated applications)
Moisture sensitivity level: MSL 1 (unlimited shelf life)
Product status: Active preferred; Obsolete acceptable with sufficient inventory

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (Texas Instruments LM324 Series): Parts maintaining identical or superior electrical specifications with active product status. These include LM324KADR, LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB. Packaging differs (Tube, Tape & Reel, Cut Tape) but electrical performance remains consistent.

Category B - Functional Alternatives (Extended Performance or Lower Power): Parts with modified electrical characteristics suitable for specific application requirements. LP324M/NOPB and LP324MX/NOPB offer reduced power consumption (85µA vs 1.4mA) with lower bandwidth (100 kHz vs 1.2 MHz). BA10324AF-E2 and BA2902F-E2 provide extended temperature ranges and alternative packaging from Rohm Semiconductor.

Category C - Legacy Compatibility (Obsolete Status): LM2902DR (Rohm Semiconductor) maintains functional equivalence but is classified as Obsolete. Substitution is valid only when inventory availability is confirmed and long-term supply is not critical.

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
LM324KAD	Texas Instruments	Last Time Buy	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-SOIC
BA2902F-E2	Rohm Semiconductor	Active	0.2	0.5	20	0.7	30	-40 to 125	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

LM324KADR is the manufacturer-recommended direct substitute. It maintains identical electrical specifications to the LM324KAD with the only difference being packaging format (Tape & Reel vs. Tube). Product status is Active with 1900 pcs in stock. This part is suitable for all applications currently using LM324KAD without circuit redesign or performance degradation.

LM324AMX/NOPB and LM324MX/NOPB are active Texas Instruments alternatives within the LM324 base product family. These parts operate at 1.0 MHz gain bandwidth product (versus 1.2 MHz) and exhibit higher input bias current (45 nA versus 15 nA). They are suitable for applications where the reduced bandwidth and increased bias current do not impact circuit performance. Inventory availability is high (36,756 and 50,513 pcs respectively).

Secondary Substitutes (Application-Dependent):

LP324M/NOPB and LP324MX/NOPB are low-power variants suitable for battery-powered or energy-constrained applications. Supply current is reduced to 85µA (versus 1.4mA), and output current per channel is limited to 10mA (versus 30mA). These parts are appropriate only for applications with reduced bandwidth requirements (100 kHz versus 1.2 MHz) and lower output drive capability.

BA10324AF-E2 and BA2902F-E2 (Rohm Semiconductor) provide extended operating temperature ranges (-40°C to 85°C and -40°C to 125°C respectively) suitable for industrial or automotive environments. Bandwidth is reduced to 500 kHz. These parts are appropriate for temperature-critical applications where the LM324KAD operating range (0°C to 70°C) is insufficient.

Compliance & Regulatory Status:

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating. All parts are classified as REACH Unaffected and carry EAR99 export classification. No regulatory barriers exist for substitution within the recommended parts list.

Obsolete Parts:

LM2902DR (Rohm Semiconductor) is classified as Obsolete. Substitution is acceptable only when current inventory (90,223 pcs) is confirmed available and long-term supply continuity is not required. This part is not recommended for new designs or long-term production commitments.

Frequently Asked Questions (FAQ)

Q: Can LM324KADR be used as a direct replacement for LM324KAD?

A: Yes. LM324KADR is the manufacturer-recommended substitute with identical electrical specifications. The only difference is packaging format: LM324KADR is supplied in Tape & Reel format while LM324KAD is supplied in Tube format. Both are 14-SOIC surface mount packages with identical pinout and electrical performance. No circuit modifications are required.

Q: What is the difference between LM324KAD and LM324AMX/NOPB?

A: Both are 4-circuit general-purpose operational amplifiers in 14-SOIC packaging. Key differences are: (1) Gain bandwidth product: LM324KAD operates at 1.2 MHz while LM324AMX/NOPB operates at 1.0 MHz; (2) Input bias current: LM324KAD is 15 nA while LM324AMX/NOPB is 45 nA; (3) Product status: LM324KAD is Last Time Buy while LM324AMX/NOPB is Active. LM324AMX/NOPB is suitable for applications where the reduced bandwidth and increased bias current do not impact performance.

Q: Why would I choose LP324M/NOPB over LM324KAD?

A: LP324M/NOPB is a low-power variant designed for battery-powered or energy-constrained applications. Supply current is 85µA compared to 1.4mA for LM324KAD, representing a 16-fold reduction in power consumption. However, this comes with trade-offs: bandwidth is reduced from 1.2 MHz to 100 kHz, and output current per channel is limited to 10mA versus 30mA. LP324M/NOPB is appropriate only for applications with reduced bandwidth and output drive requirements.

Q: Can I use BA10324AF-E2 or BA2902F-E2 in place of LM324KAD?

A: These Rohm Semiconductor parts are functionally compatible but with performance trade-offs. Both operate at 500 kHz bandwidth (versus 1.2 MHz for LM324KAD) and 0.2V/µs slew rate (versus 0.5V/µs). Advantages include extended operating temperature ranges (-40°C to 85°C for BA10324AF-E2 and -40°C to 125°C for BA2902F-E2) suitable for industrial or automotive environments. These parts are appropriate only when extended temperature operation is required and reduced bandwidth is acceptable.

Q: Is LM2902DR a suitable substitute?

A: LM2902DR is functionally compatible but classified as Obsolete. It maintains 1.2 MHz bandwidth and 30mA output current per channel. However, slew rate is reduced to 0.3V/µs and input bias current is higher at 20 nA. Substitution is acceptable only when current inventory is confirmed available and long-term supply continuity is not required. This part is not recommended for new designs.

Q: What packaging options are available for LM324 substitutes?

A: All recommended substitutes are supplied in 14-SOIC surface mount packaging with identical pinout and footprint compatibility. Packaging format differences (Tube, Tape & Reel, Cut Tape) affect supply and handling but do not impact electrical performance or PCB assembly compatibility. Select packaging format based on production volume and assembly equipment requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitutes (LM324KADR, LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB, LP324M/NOPB, LP324MX/NOPB, BA10324AF-E2, BA2902F-E2) are ROHS3 compliant. LM2902DR is also ROHS3 compliant. All parts carry MSL 1 moisture sensitivity rating and are REACH Unaffected.

Q: What is the operating temperature range for each substitute?

A: LM324KAD, LM324KADR, LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, LM324MX/NOPB, LP324M/NOPB, and LP324MX/NOPB all operate from 0°C to 70°C. LM2902DR operates from -40°C to 125°C. BA10324AF-E2 operates from -40°C to 85°C. BA2902F-E2 operates from -40°C to 125°C. Select based on application temperature requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the electrical requirements of the specific circuit stage. However, mixing parts with different bandwidth, slew rate, or output current specifications may result in performance variations across channels or stages. For consistency and predictability, use identical part numbers across all operational amplifier stages in a design.

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