LM324MT Equivalent & Substitute Parts

Part Overview

The LM324MT is a general-purpose operational amplifier featuring four independent circuits in a 14-TSSOP surface mount package. Manufactured by Texas Instruments under the LinCMOS™ series, this device operates across a supply voltage range of 3V to 32V with a gain bandwidth product of 1 MHz. The LM324MT is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1 MHz	MHz
Current - Input Bias	45 nA	nA
Voltage - Input Offset	2 mV	mV
Current - Supply	1.5 mA	mA
Current - Output / Channel	40 mA	mA
Voltage - Supply Span (Min)	3 V	V
Voltage - Supply Span (Max)	32 V	V
Operating Temperature	0°C ~ 70°C	°C
Mounting Type	Surface Mount	—
Package / Case	14-TSSOP (0.173", 4.40mm Width)	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution compatibility for the LM324MT is determined by the following critical parameters:

Electrical Compatibility Criteria:

Amplifier Type: General Purpose (all substitutes maintain this classification)
Number of Circuits: 4 (all substitutes contain four independent amplifier circuits)
Voltage - Supply Span: Minimum 3V, Maximum 32V (substitutes must support this range or broader)
Current - Output / Channel: 40 mA (substitutes must meet or exceed this specification)
Voltage - Input Offset: 2 mV (substitutes must not exceed this value)
Mounting Type: Surface Mount (all substitutes use surface mount technology)

Package Compatibility:

Primary package: 14-TSSOP (0.173", 4.40mm Width) — direct pin-compatible substitutes
Alternative package: 14-SOIC (0.154", 3.90mm Width) — functionally equivalent but requires PCB layout modification
Alternative package: 14-SSOP-B (0.173", 4.40mm Width) — functionally equivalent with minor footprint variation

Compliance & Status:

Product Status: Active substitutes are preferred over obsolete originals
RoHS Compliance: ROHS3-compliant substitutes are required for new designs
MSL Rating: All substitutes maintain MSL 1 (Unlimited) compatibility

Substitutes are grouped into three categories: direct equivalents (identical electrical and package specifications), pin-compatible alternatives (same package, similar electrical performance), and functional alternatives (different package, equivalent electrical performance).

Parameter Comparison

Part Number	Manufacturer	Product Status	GBW (MHz)	Input Bias (nA)	Supply Span (V)	Output Current (mA)	Package	Temp Range (°C)	RoHS Status
LM324MT	Texas Instruments	Obsolete	1	45	3–32	40	14-TSSOP	0–70	Non-compliant
LM324MT/NOPB	Texas Instruments	Active	1	45	3–32	40	14-TSSOP	0–70	ROHS3 Compliant
LM324DTBR2G	onsemi	Active	1	90	3–32	40	14-TSSOP	0–70	ROHS3 Compliant
BA2902FV-E2	Rohm Semiconductor	Active	0.5	20	3–32	30	14-LSSOP	-40–125	ROHS3 Compliant
BA2902SFV-E2	Rohm Semiconductor	Active	0.5	20	3–32	30	14-LSSOP	-40–105	ROHS3 Compliant
BA3474FVJ-E2	Rohm Semiconductor	Active	4	100	3–36	30	14-TSSOP	-40–85	ROHS3 Compliant
LM224APT	STMicroelectronics	Active	1.3	20	3–30	40	14-TSSOP	-40–105	ROHS3 Compliant
LM224D	STMicroelectronics	Active	1.2	20	3–30	40	14-SOIC	-40–105	ROHS3 Compliant
LM224DT	STMicroelectronics	Active	1.3	20	3–30	40	14-SOIC	-40–105	ROHS3 Compliant
LM224DTBR2G	onsemi	Active	1	90	3–32	40	14-TSSOP	-25–85	ROHS3 Compliant
LM224PT	STMicroelectronics	Active	1.3	20	3–30	40	14-TSSOP	-40–105	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

LM324MT/NOPB is the direct equivalent of LM324MT. This part maintains identical electrical specifications and 14-TSSOP packaging. The primary distinction is product status: LM324MT/NOPB is active and ROHS3-compliant, whereas the original LM324MT is obsolete and non-compliant. For applications requiring exact specification matching with modern compliance requirements, LM324MT/NOPB is the preferred selection.

Pin-Compatible Substitutes (14-TSSOP Package):

LM324DTBR2G (onsemi) and LM224DTBR2G (onsemi) are pin-compatible with the LM324MT in 14-TSSOP packaging. Both maintain the 40 mA output current specification and 3V–32V supply range. Input bias current is higher (90 nA versus 45 nA), which may affect precision applications requiring minimal input current. Both parts are active and ROHS3-compliant.

LM224APT and LM224PT (STMicroelectronics) are pin-compatible alternatives in 14-TSSOP packaging. These parts feature lower input bias current (20 nA), reduced maximum supply voltage (30V versus 32V), and slightly higher gain bandwidth product (1.3 MHz). Both are active and ROHS3-compliant with extended operating temperature range (-40°C to 105°C).

Functional Alternatives (Different Package):

LM224D and LM224DT (STMicroelectronics) provide functional equivalence in 14-SOIC packaging. These parts require PCB layout modification due to different footprint dimensions (0.154" width versus 0.173"). Electrical specifications are comparable to LM224APT/LM224PT. Both are active and ROHS3-compliant.

Enhanced Performance Alternative:

BA3474FVJ-E2 (Rohm Semiconductor) offers enhanced performance characteristics: 4 MHz gain bandwidth product, 10V/µs slew rate, and extended supply voltage range (3V–36V). Input bias current is higher (100 nA), and output current is reduced (30 mA). This part is suitable for applications requiring higher bandwidth and faster slew rate. 14-TSSOP packaging maintains pin compatibility. Active and ROHS3-compliant.

Lower Performance Alternatives:

BA2902FV-E2 and BA2902SFV-E2 (Rohm Semiconductor) feature reduced gain bandwidth product (0.5 MHz) and lower output current (30 mA). These parts are suitable for applications with relaxed bandwidth requirements. Package is 14-LSSOP, requiring PCB layout modification. Both are active and ROHS3-compliant.

Frequently Asked Questions (FAQ)

Q: Can LM324MT/NOPB be used as a direct replacement for LM324MT?

A: Yes. LM324MT/NOPB is the direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3-compliant versus non-compliant). No circuit modifications are required.

Q: What is the difference between LM324DTBR2G and LM224DTBR2G?

A: Both are onsemi products in 14-TSSOP packaging with identical electrical specifications. The primary distinction is the base product number (LM324 versus LM224), which reflects different manufacturing lineages. Both are functionally equivalent for the LM324MT application.

Q: Can I use LM224D or LM224DT as substitutes if I modify the PCB layout?

A: Yes. LM224D and LM224DT are functionally equivalent but use 14-SOIC packaging (0.154" width) instead of 14-TSSOP (0.173" width). PCB layout modification is required. Electrical performance is comparable to LM224APT/LM224PT.

Q: What is the impact of higher input bias current in onsemi parts?

A: onsemi LM324DTBR2G and LM224DTBR2G feature 90 nA input bias current versus 45 nA in the original LM324MT. This difference may affect precision applications requiring minimal input current. For general-purpose applications, this difference is typically negligible.

Q: Is BA3474FVJ-E2 a suitable substitute for high-speed applications?

A: BA3474FVJ-E2 offers enhanced performance with 4 MHz gain bandwidth product and 10V/µs slew rate, compared to 1 MHz and unspecified slew rate in LM324MT. However, output current is reduced to 30 mA. This part is suitable for applications requiring higher bandwidth. Pin compatibility in 14-TSSOP packaging is maintained.

Q: Why do some substitutes have reduced maximum supply voltage?

A: STMicroelectronics LM224 series parts specify 30V maximum supply voltage versus 32V in LM324MT. This difference reflects different design specifications. For applications operating below 30V, this is not a limiting factor. Applications requiring 30V–32V operation must use parts with 32V or higher maximum rating.

Q: Are all substitute parts RoHS3-compliant?

A: Yes. All substitute parts listed are ROHS3-compliant. The original LM324MT is RoHS non-compliant. For new designs and production, ROHS3-compliant substitutes are required to meet regulatory requirements.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture control during storage or handling. All parts listed maintain this rating, ensuring consistent handling requirements.

Q: Can I use BA2902FV-E2 or BA2902SFV-E2 for bandwidth-critical applications?

A: No. BA2902FV-E2 and BA2902SFV-E2 feature 0.5 MHz gain bandwidth product, which is half that of LM324MT (1 MHz). These parts are suitable only for applications with relaxed bandwidth requirements. For bandwidth-critical applications, use LM224APT, LM224PT, or BA3474FVJ-E2.

Q: What is the difference between BA2902FV-E2 and BA2902SFV-E2?

A: Both are Rohm Semiconductor products with identical electrical specifications and 14-LSSOP packaging. The primary difference is operating temperature range: BA2902FV-E2 operates -40°C to 125°C, while BA2902SFV-E2 operates -40°C to 105°C. Select based on application temperature requirements.

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