LM324KPW Equivalent & Substitute Parts

Part Overview

The LM324KPW 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	LM324KPW Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	Channels
Slew Rate	0.5	V/µs
Gain Bandwidth Product	1.2	MHz
Current - Input Bias	20	nA
Voltage - Input Offset	3	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

Substitute parts for the LM324KPW are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Four independent operational amplifier circuits
14-TSSOP or equivalent surface mount package (0.173", 4.40mm width)
Supply voltage range compatibility (minimum 3V, maximum ≥30V)
Input bias current ≤20 nA
Input offset voltage ≤3 mV
Output current per channel ≥30 mA
Operating temperature range encompassing 0°C to 70°C

Substitution Categories:

Category 1: Direct Electrical Equivalents (Texas Instruments LM324 Series) Parts maintaining identical electrical specifications with packaging variations: LM324KPWR, LM324MT/NOPB, LM324MTX/NOPB.

Category 2: Lower Performance Variants (Texas Instruments LP324 Series) Parts with reduced slew rate (0.05V/µs) and gain bandwidth product (100 kHz), suitable only for applications not requiring the original performance specifications: LP324MT/NOPB, LP324MTX/NOPB.

Category 3: Alternative Manufacturer Equivalents (Rohm Semiconductor) Parts from alternative manufacturers meeting core electrical parameters with package variations: BA10324AFV-E2, BA2902FV-E2, BA2902SFV-E2, BA3474FVJ-E2.

Category 4: Alternative Manufacturer Equivalents (STMicroelectronics) Parts from alternative manufacturers meeting core electrical parameters: LM224APT.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Vcc Min (V)	Vcc Max (V)	Temp Range (°C)	Package	Status
LM324KPW	Texas Instruments	0.5	1.2	20	3	1.4	30	3	30	0 to 70	14-TSSOP	Last Time Buy
LM324KPWR	Texas Instruments	0.5	1.2	20	3	1.4	30	3	30	0 to 70	14-TSSOP	Active
LM324MT/NOPB	Texas Instruments	—	1	45	2	1.5	40	3	32	0 to 70	14-TSSOP	Active
LM324MTX/NOPB	Texas Instruments	—	1	45	2	1.5	40	3	32	0 to 70	14-TSSOP	Active
LP324MT/NOPB	Texas Instruments	0.05	0.1	2	2	0.085	10	3	32	0 to 70	14-TSSOP	Active
LP324MTX/NOPB	Texas Instruments	0.05	0.1	2	2	0.085	10	3	32	0 to 70	14-TSSOP	Active
BA10324AFV-E2	Rohm Semiconductor	0.2	0.5	20	2	0.6	35	3	32	-40 to 85	14-LSSOP	Active
BA2902FV-E2	Rohm Semiconductor	0.2	0.5	20	2	0.7	30	3	32	-40 to 125	14-LSSOP	Active
BA2902SFV-E2	Rohm Semiconductor	0.2	0.5	20	2	0.7	30	3	32	-40 to 105	14-LSSOP	Active
BA3474FVJ-E2	Rohm Semiconductor	10	4	100	1.5	8	30	3	36	-40 to 85	14-TSSOP	Active
LM224APT	STMicroelectronics	0.4	1.3	20	2	1.5	40	3	30	-40 to 105	14-TSSOP	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

LM324KPWR is the primary recommended substitute. This part maintains all electrical specifications of the LM324KPW while offering Active product status and higher inventory availability (40,665 units). The only difference is packaging format (Tape & Reel versus Tube), which does not affect electrical performance. Both parts are ROHS3 compliant and carry identical certifications.

For Applications Tolerating Reduced Performance:

LP324MT/NOPB and LP324MTX/NOPB are suitable only for applications where reduced slew rate (0.05V/µs versus 0.5V/µs) and lower gain bandwidth product (100 kHz versus 1.2 MHz) are acceptable. These parts offer significantly lower supply current (85µA versus 1.4mA) and reduced output current capability (10mA versus 30mA per channel). Selection requires verification that application bandwidth and output drive requirements do not exceed these reduced specifications.

For Extended Temperature Range Applications:

LM224APT (STMicroelectronics) provides operating temperature range of -40°C to 105°C compared to the original 0°C to 70°C. Electrical specifications remain compatible with slew rate of 0.4V/µs and gain bandwidth product of 1.3 MHz. This part is suitable for industrial and automotive temperature environments.

For Alternative Manufacturer Selection:

BA10324AFV-E2, BA2902FV-E2, BA2902SFV-E2, and BA3474FVJ-E2 (Rohm Semiconductor) provide alternative sourcing. BA2902FV-E2 offers the widest operating temperature range (-40°C to 125°C). BA3474FVJ-E2 provides significantly higher performance (10V/µs slew rate, 4MHz gain bandwidth product) but with increased supply current (8mA) and input bias current (100nA), suitable only for applications requiring enhanced dynamic performance.

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can LM324KPWR directly replace LM324KPW in existing designs?

A: Yes. LM324KPWR is electrically identical to LM324KPW, maintaining all performance specifications including 0.5V/µs slew rate, 1.2 MHz gain bandwidth product, and 3V to 30V supply range. The only difference is packaging format (Tape & Reel versus Tube). Both parts are surface mount 14-TSSOP packages with identical pinout and electrical characteristics. No circuit modifications are required.

Q: What are the key differences between LM324KPW and LP324MT/NOPB?

A: LP324MT/NOPB is a lower-performance variant with significantly reduced specifications. Slew rate is reduced from 0.5V/µs to 0.05V/µs, gain bandwidth product decreases from 1.2 MHz to 100 kHz, and output current per channel drops from 30mA to 10mA. Supply current is substantially lower at 85µA versus 1.4mA. LP324MT/NOPB is suitable only for low-bandwidth applications such as precision instrumentation or sensor signal conditioning where reduced performance is acceptable and lower power consumption is beneficial.

Q: Are Rohm Semiconductor parts (BA series) pin-compatible with LM324KPW?

A: BA10324AFV-E2, BA2902FV-E2, and BA2902SFV-E2 are pin-compatible in 14-pin surface mount packages. However, they use 14-LSSOP package variant rather than 14-TSSOP. While both packages have identical pinout and 0.173" width, the LSSOP variant has slightly different body dimensions. PCB footprints must be verified for compatibility. BA3474FVJ-E2 uses 14-TSSOP-BJ package, which is mechanically compatible with 14-TSSOP but features enhanced performance specifications.

Q: Which substitute part offers the best performance upgrade?

A: BA3474FVJ-E2 provides the highest performance with 10V/µs slew rate and 4 MHz gain bandwidth product, representing 20x improvement in slew rate and 3.3x improvement in bandwidth. However, this part requires higher supply current (8mA versus 1.4mA) and exhibits higher input bias current (100nA versus 20nA). Selection depends on application requirements for dynamic performance versus power consumption constraints.

Q: What is the temperature range consideration for industrial applications?

A: LM324KPW operates from 0°C to 70°C. For extended temperature environments, LM224APT (-40°C to 105°C) or BA2902FV-E2 (-40°C to 125°C) are appropriate selections. BA2902FV-E2 offers the widest temperature range and is suitable for automotive and industrial applications requiring operation below 0°C or above 70°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard surface mount assembly processes and environmental regulations.

Q: What is the significance of "Last Time Buy" status for LM324KPW?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of LM324KPW. Existing inventory will be depleted without replenishment. LM324KPWR is the recommended active replacement, offering identical electrical specifications with continued manufacturing support. For new designs or long-term production requirements, LM324KPWR should be specified to ensure supply chain continuity.

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