LP324MT Equivalent & Substitute Parts

Part Overview

The LP324MT is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, housed in a 14-TSSOP surface-mount package. This device contains four independent amplifier circuits and is classified as obsolete. The LP324MT operates across a supply voltage range of 3V to 32V with an operating temperature range of 0°C to 70°C. Due to its obsolete product status, identification of equivalent and substitute parts is necessary for design continuity, procurement alternatives, and long-term product support.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.05	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	2	nA
Voltage - Input Offset	2	mV
Current - Supply	85	µA
Current - Output / Channel	10	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	0 to 70	°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LP324MT are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic is determined by the following parameters:

Critical Matching Parameters:

Package type: 14-TSSOP surface-mount configuration
Number of circuits: 4 independent amplifier channels
Supply voltage range: Minimum 3V, maximum 32V
Mounting type: Surface mount
Moisture sensitivity level: MSL 1

Secondary Compatibility Parameters:

Slew rate: 0.05V/µs (LP324MT baseline)
Gain bandwidth product: 100 kHz (LP324MT baseline)
Input bias current: 2 nA (LP324MT baseline)
Input offset voltage: 2 mV (LP324MT baseline)
Supply current: 85µA (LP324MT baseline)
Output current per channel: 10 mA (LP324MT baseline)

Substitutes are classified into two categories:

Category 1 - Direct Equivalents: Parts maintaining identical electrical specifications (LP324MT/NOPB). These provide pin-for-pin compatibility with no design modifications required.

Category 2 - Functional Alternatives: Parts with enhanced or modified electrical specifications (LM2902 series, LM324 variants) that operate within the same package and voltage envelope but may exhibit different performance characteristics in slew rate, bandwidth, bias current, or output current capacity.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Output Current (mA)	Temp Range (°C)	Product Status	RoHS Status
LP324MT	Texas Instruments	0.05	100	2	2	85	10	0 to 70	Obsolete	Non-compliant
LP324MT/NOPB	Texas Instruments	0.05	100	2	2	85	10	0 to 70	Active	ROHS3 Compliant
LM2902KAVMPWREP	Texas Instruments	0.5	1200	20	3	1400	60	-55 to 125	Active	ROHS3 Compliant
LM2902KAVQPWREP	Texas Instruments	0.5	1200	20	3	1400	60	-55 to 125	Active	ROHS3 Compliant
LM324APW	Texas Instruments	0.5	1200	15	2	1400	30	0 to 70	Last Time Buy	ROHS3 Compliant
LM324APWR	Texas Instruments	0.5	1200	15	2	1400	30	0 to 70	Active	ROHS3 Compliant
LM324KAPWR	Texas Instruments	0.5	1200	15	2	1400	30	0 to 70	Active	ROHS3 Compliant
LM324KPWR	Texas Instruments	0.5	1200	20	3	1400	30	0 to 70	Active	ROHS3 Compliant
LM324PW	Texas Instruments	0.5	1200	20	3	1400	30	0 to 70	Last Time Buy	ROHS3 Compliant
LM324PWR	Rohm Semiconductor	0.3	1200	20	1	1000	30	-40 to 85	Obsolete	ROHS3 Compliant
LP2902PWR	Texas Instruments	0.05	100	2	2	85	10	-40 to 85	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

LP324MT/NOPB is the direct equivalent of LP324MT. This part maintains identical electrical specifications and package configuration. The primary distinction is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-compliant). Selection of LP324MT/NOPB is appropriate for applications requiring exact electrical performance matching and modern compliance certifications.

For Enhanced Performance Applications:

LM324APWR and LM324KAPWR provide improved specifications within the same operating temperature range (0°C to 70°C) as the LP324MT. These parts offer 10× higher slew rate (0.5V/µs vs. 0.05V/µs), 12× higher gain bandwidth product (1200 kHz vs. 100 kHz), and increased output current capacity (30 mA vs. 10 mA per channel). Both parts maintain Active product status and ROHS3 compliance. These selections are suitable for applications requiring faster transient response and higher output drive capability.

For Extended Temperature Range Applications:

LP2902PWR operates across -40°C to 85°C, extending the lower temperature limit by 40°C compared to LP324MT. This part maintains the same low-power characteristics (85µA supply current, 0.05V/µs slew rate, 100 kHz bandwidth) while providing Active product status and ROHS3 compliance. Selection is appropriate for industrial or automotive environments requiring wider temperature operation.

For Wide Temperature and Enhanced Performance:

LM2902KAVMPWREP and LM2902KAVQPWREP operate across -55°C to 125°C with enhanced electrical specifications (0.5V/µs slew rate, 1200 kHz bandwidth, 60 mA output current). These parts are suitable for military-grade or extreme-environment applications requiring both temperature extremes and improved dynamic performance.

Compliance Considerations:

All substitute parts except LP324MT carry ROHS3 compliance certification. Applications subject to RoHS regulatory requirements must select from the compliant alternatives. LP324MT/NOPB provides the most direct path to compliance while maintaining identical electrical performance.

Frequently Asked Questions (FAQ)

Q1: Can LP324MT/NOPB be used as a direct replacement for LP324MT?

A: Yes. LP324MT/NOPB is electrically identical to LP324MT, with identical slew rate (0.05V/µs), gain bandwidth product (100 kHz), input bias current (2 nA), input offset voltage (2 mV), supply current (85µA), and output current (10 mA per channel). Both operate across 3V to 32V supply range in 14-TSSOP package. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-compliant).

Q2: What are the key differences between LP324MT and LM324APWR?

A: LM324APWR exhibits enhanced performance specifications: slew rate increases from 0.05V/µs to 0.5V/µs (10× improvement), gain bandwidth product increases from 100 kHz to 1200 kHz (12× improvement), and output current per channel increases from 10 mA to 30 mA (3× improvement). Input bias current is lower (15 nA vs. 2 nA), and supply current is higher (1400µA vs. 85µA). Both operate within 0°C to 70°C temperature range and 3V to 30V supply span. Package and mounting type are identical (14-TSSOP, surface mount).

Q3: Is LP2902PWR compatible with LP324MT applications?

A: LP2902PWR maintains identical electrical specifications to LP324MT (0.05V/µs slew rate, 100 kHz bandwidth, 2 nA input bias, 2 mV offset, 85µA supply current, 10 mA output current) and identical package (14-TSSOP). The primary difference is extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C). Applications operating within the original 0°C to 70°C range will function identically. Applications requiring operation below 0°C or above 70°C require LP2902PWR.

Q4: Can LM2902KAVQPWREP replace LP324MT in all applications?

A: LM2902KAVQPWREP is electrically compatible in package and pinout (14-TSSOP, 4 circuits, surface mount) but exhibits significantly different performance characteristics. Slew rate is 10× higher (0.5V/µs), bandwidth is 12× higher (1200 kHz), input bias current is 10× higher (20 nA), and output current is 6× higher (60 mA). Supply current is 16× higher (1400µA). Operating temperature range extends to -55°C to 125°C. Applications sensitive to slew rate, bandwidth, bias current, or power consumption may require circuit redesign. Applications requiring only basic amplification function will operate correctly.

Q5: What is the significance of RoHS compliance in substitute selection?

A: RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement in many markets. LP324MT is RoHS non-compliant, while all listed substitutes (LP324MT/NOPB, LM324 variants, LP2902PWR, LM2902 variants) carry ROHS3 compliance certification. Products destined for European Union markets, consumer electronics, or regulated industries must use RoHS-compliant alternatives. Compliance status does not affect electrical functionality but is mandatory for legal product distribution in regulated regions.

Q6: Which substitute offers the best balance of compatibility and modern compliance?

A: LP324MT/NOPB provides optimal compatibility with identical electrical specifications and modern ROHS3 compliance. This part requires no circuit redesign, maintains all original performance characteristics, and satisfies regulatory compliance requirements. It is the recommended selection for direct replacement in existing designs.

Q7: Are there packaging differences between substitute parts?

A: All listed substitutes use identical 14-TSSOP surface-mount package (0.173" width, 4.40mm). Packaging variations exist only in distribution format (Tube, Cut Tape & Digi-Reel, Tape & Reel), which affects procurement and handling but not circuit compatibility. PCB footprint and soldering requirements are identical across all parts.

Q8: What supply voltage range is supported by all substitutes?

A: LP324MT and LP324MT/NOPB support 3V to 32V. LM324 variants (LM324APWR, LM324KAPWR, LM324KPWR, LM324PW, LM324APW) support 3V to 30V. LM2902 variants (LM2902KAVMPWREP, LM2902KAVQPWREP) support 3V to 32V. LP2902PWR supports 3V to 32V. Applications operating above 30V must use LP324MT, LP324MT/NOPB, LM2902 variants, or LP2902PWR.

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