LM324KAPW Equivalent & Substitute Parts

Part Overview

The LM324KAPW is a general-purpose operational amplifier featuring four independent circuits in a 14-TSSOP surface mount package. Manufactured by Texas Instruments, this device operates across a 3V to 30V supply range with a 1.2 MHz gain bandwidth product and 0.5V/µs slew rate. The part is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring general-purpose amplification.

Key Parameters

Parameter	LM324KAPW 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-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM324KAPW is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

Four independent operational amplifier circuits
14-TSSOP or compatible 14-pin surface mount package (0.173", 4.40mm width)
Supply voltage range minimum of 3V and maximum of at least 30V
Input offset voltage of 2mV or lower
Output current per channel of at least 30mA
Operating temperature range encompassing 0°C to 70°C

Secondary Compatibility Factors:

Slew rate of 0.5V/µs or higher
Gain bandwidth product of 1.2 MHz or higher
Input bias current of 15nA or lower
Supply current of 1.4mA or lower (for all four channels)

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications and packaging) and Functional Alternatives (meet all primary criteria with variations in secondary parameters).

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package	Product Status
LM324KAPW	Texas Instruments	0.5	1.2	15	1.4	30	0 to 70	14-TSSOP	Last Time Buy
LM324KAPWR	Texas Instruments	0.5	1.2	15	1.4	30	0 to 70	14-TSSOP	Active
LM324MT/NOPB	Texas Instruments	—	1.0	45	1.5	40	0 to 70	14-TSSOP	Active
LM324MTX/NOPB	Texas Instruments	—	1.0	45	1.5	40	0 to 70	14-TSSOP	Active
LP324MT/NOPB	Texas Instruments	0.05	0.1	2	0.085	10	0 to 70	14-TSSOP	Active
LP324MTX/NOPB	Texas Instruments	0.05	0.1	2	0.085	10	0 to 70	14-TSSOP	Active
BA10324AFV-E2	Rohm Semiconductor	0.2	0.5	20	0.6	35	-40 to 85	14-LSSOP	Active
BA2902FV-E2	Rohm Semiconductor	0.2	0.5	20	0.7	30	-40 to 125	14-LSSOP	Active
BA2902SFV-E2	Rohm Semiconductor	0.2	0.5	20	0.7	30	-40 to 105	14-LSSOP	Active
BA3474FVJ-E2	Rohm Semiconductor	10	4	100	8	30	-40 to 85	14-TSSOP	Active
LM224APT	STMicroelectronics	0.4	1.3	20	1.5	40	-40 to 105	14-TSSOP	Active

Engineering Selection Recommendations

Recommended Primary Substitute: LM324KAPWR

The LM324KAPWR is the direct equivalent of the LM324KAPW, offering identical electrical specifications and packaging. This part maintains Active product status with Texas Instruments, ensuring long-term availability and supply chain stability. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect electrical performance. This substitute is suitable for all applications currently using the LM324KAPW.

Secondary Substitutes (Texas Instruments LM324 Series):

LM324MT/NOPB and LM324MTX/NOPB are Active alternatives within the LM324 base product family. These parts meet the primary substitution criteria with slightly reduced slew rate specification and increased input bias current. The gain bandwidth product of 1.0 MHz remains within acceptable tolerance for general-purpose amplification. These substitutes are appropriate for applications where the 1.2 MHz specification is not critical.

Alternative Substitutes (Different Base Products):

LM224APT (STMicroelectronics) provides functional equivalence with a 1.3 MHz gain bandwidth product and extended operating temperature range (-40°C to 105°C). This part is suitable for applications requiring enhanced temperature performance while maintaining electrical compatibility.

BA10324AFV-E2, BA2902FV-E2, and BA2902SFV-E2 (Rohm Semiconductor) are functional alternatives with reduced slew rate (0.2V/µs) and gain bandwidth product (0.5 MHz). These parts are suitable only for applications where lower bandwidth requirements exist.

BA3474FVJ-E2 (Rohm Semiconductor) offers significantly enhanced performance with 10V/µs slew rate and 4 MHz gain bandwidth product. This part is suitable for high-speed applications but introduces higher supply current (8mA) and input bias current (100nA).

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory alignment with the original LM324KAPW.

Frequently Asked Questions (FAQ)

Q: Can LM324KAPWR be used as a direct replacement for LM324KAPW?

A: Yes. LM324KAPWR is electrically and functionally identical to LM324KAPW. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). Both parts share identical electrical specifications, operating temperature range, and supply voltage requirements. No circuit modifications are required.

Q: What is the difference between LM324KAPW and LM324MT/NOPB?

A: Both parts are four-channel general-purpose operational amplifiers in 14-TSSOP packages. LM324KAPW specifies 0.5V/µs slew rate and 1.2 MHz gain bandwidth product, while LM324MT/NOPB specifies 1.0 MHz gain bandwidth product with unspecified slew rate. LM324MT/NOPB exhibits higher input bias current (45nA versus 15nA) and slightly higher supply current (1.5mA versus 1.4mA). Substitution is valid for applications where the reduced bandwidth specification is acceptable.

Q: Are Rohm Semiconductor BA10324AFV-E2 and BA2902 series suitable replacements?

A: These parts meet primary substitution criteria (four circuits, 14-pin surface mount, 3V to 32V supply range, 2mV input offset voltage, 30mA+ output current). However, they exhibit significantly reduced slew rate (0.2V/µs versus 0.5V/µs) and gain bandwidth product (0.5 MHz versus 1.2 MHz). Substitution is appropriate only for applications where lower bandwidth performance is acceptable. Circuit performance may differ in high-frequency applications.

Q: Can BA3474FVJ-E2 replace LM324KAPW?

A: BA3474FVJ-E2 meets primary substitution criteria but introduces substantial performance differences. This part offers higher slew rate (10V/µs) and gain bandwidth product (4 MHz), making it suitable for high-speed applications. However, it exhibits significantly higher supply current (8mA versus 1.4mA) and input bias current (100nA versus 15nA). Substitution requires circuit evaluation to confirm power supply capability and noise performance compatibility.

Q: What packaging options are available for LM324 substitutes?

A: All recommended substitutes are available in 14-pin surface mount packages. LM324KAPW and LM324KAPWR use 14-TSSOP packaging. LM324MT/NOPB and LM324MTX/NOPB use 14-TSSOP packaging. Rohm Semiconductor parts (BA10324AFV-E2, BA2902 series) use 14-LSSOP packaging, which is mechanically compatible with 14-TSSOP footprints. LM224APT uses 14-TSSOP packaging. All parts maintain 0.173" (4.40mm) width specification.

Q: Which substitute offers the best long-term availability?

A: LM324KAPWR maintains Active product status with Texas Instruments and offers the highest inventory levels (10,200 pieces). LM224APT (STMicroelectronics) and LM324MTX/NOPB (Texas Instruments) also maintain Active status with substantial inventory. These three parts are recommended for new designs requiring long-term supply assurance.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status. No regulatory or environmental compliance issues exist when substituting any recommended part.

Q: What is the operating temperature difference between LM324KAPW and alternatives?

A: LM324KAPW operates from 0°C to 70°C. LM224APT extends this to -40°C to 105°C. Rohm Semiconductor BA2902FV-E2 extends to -40°C to 125°C. For applications requiring operation below 0°C or above 70°C, these extended-range alternatives are necessary. For standard 0°C to 70°C applications, all substitutes are suitable.

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