LMX324IPT Equivalent & Substitute Parts

Part Overview

The LMX324IPT is a general-purpose operational amplifier manufactured by STMicroelectronics, configured as a 4-circuit rail-to-rail amplifier in a 14-TSSOP surface-mount package. This device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1). The LMX324IPT operates across a supply voltage range of 2.3 V to 5.5 V and maintains functionality over the industrial temperature range of -40°C to 125°C.

Substitute parts are necessary when the primary part becomes unavailable due to inventory constraints, supply chain disruptions, or manufacturing discontinuation. Alternative devices meeting equivalent electrical and mechanical specifications enable design continuity and production scheduling flexibility.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Package / Case	14-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
Voltage - Supply Span (Min)	2.3	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 125	°C
Slew Rate	0.7	V/µs
Gain Bandwidth Product	1.3	MHz
Current - Input Bias	27	nA
Voltage - Input Offset	4	mV
Current - Supply (x4 Channels)	130	µA
Current - Output / Channel	70	mA
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose (excludes CMOS variants)
Number of Circuits: 4 (quad configuration)
Output Type: Rail-to-Rail
Package / Case: 14-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 2.3 V, Maximum 5.5 V (or compatible subset)
Operating Temperature: -40°C to 125°C (or compatible subset)

Secondary Compatibility Parameters:

Slew Rate: 0.7 V/µs or greater
Gain Bandwidth Product: 1.3 MHz or greater
Current - Input Bias: 27 nA or lower
Voltage - Input Offset: 4 mV or lower
Current - Supply: 130 µA (x4 Channels) or lower
Current - Output / Channel: 70 mA or greater

Substitute parts meeting all primary criteria and maintaining compatibility with secondary parameters are classified as direct equivalents. Parts with superior performance characteristics (lower bias current, lower offset voltage, higher slew rate, higher bandwidth) are acceptable substitutes provided they do not introduce incompatibilities in the target application circuit.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Amplifier Type	Number of Circuits	Output Type	Package / Case	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Current - Input Bias (nA)	Voltage - Input Offset (mV)	Current - Supply µA (x4)	Current - Output / Channel (mA)	Voltage - Supply Min (V)	Voltage - Supply Max (V)	Operating Temperature (°C)	Product Status
LMX324IPT	STMicroelectronics	General Purpose	4	Rail-to-Rail	14-TSSOP	0.7	1.3	27	4	130	70	2.3	5.5	-40 to 125	Active
APX324TSG-13	Diodes Incorporated	General Purpose	4	Rail-to-Rail	14-TSSOP	1	1	10	1.7	340	90	2.5	5.5	-40 to 85	Active
BD12734FVJ-E2	Rohm Semiconductor	General Purpose	4	Rail-to-Rail	14-TSSOP	0.4	1	50	1	1200	12	1.8	5	-40 to 85	Active
BU7487FV-E2	Rohm Semiconductor	CMOS	4	Rail-to-Rail	14-LSSOP	10	10	0.001	1	6000	12	3	5.5	-40 to 105	Active
ISL28413FVZ	Renesas Electronics Corporation	General Purpose	4	Rail-to-Rail	14-TSSOP	1	2	0.003	0.5	90	22	1.8	5.5	-40 to 125	Active
LMR934FVJ-E2	Rohm Semiconductor	General Purpose	4	Rail-to-Rail	14-TSSOP	0.35	1.4	5	1	250	90	1.8	5	-40 to 85	Active
LMV324MT/NOPB	Texas Instruments	General Purpose	4	Rail-to-Rail	14-TSSOP	1	1	15	1.7	410	160	2.7	5.5	-40 to 125	Active
LMV324QPWR	Texas Instruments	General Purpose	4	Rail-to-Rail	14-TSSOP	1	1	15	1.7	410	40	2.7	5.5	-40 to 125	Active
LMV324TSG-13	Diodes Incorporated	General Purpose	4	Rail-to-Rail	14-TSSOP	1	1	15	1.7	340	90	2.7	5.5	-40 to 125	Active
LMV344IPW	Texas Instruments	CMOS	4	Rail-to-Rail	14-TSSOP	1	1	0.001	0.25	107	113	2.5	5.5	-40 to 125	Last Time Buy
LMV344IPWR	Texas Instruments	CMOS	4	Rail-to-Rail	14-TSSOP	1	1	0.001	0.25	107	113	2.5	5.5	-40 to 125	Active

Engineering Selection Recommendations

Direct Equivalents (General Purpose, 14-TSSOP, Rail-to-Rail):

The following parts satisfy all primary substitution criteria and maintain full compatibility with the LMX324IPT across the specified operating range:

LMV324TSG-13 (Diodes Incorporated) — Active product status. Meets all primary criteria with identical 14-TSSOP package and -40°C to 125°C operating range. Supply voltage range 2.7 V to 5.5 V encompasses the LMX324IPT specification. Superior slew rate (1 V/µs vs. 0.7 V/µs) and lower input offset voltage (1.7 mV vs. 4 mV) provide performance margin. Higher supply current (340 µA vs. 130 µA) and output current capability (90 mA vs. 70 mA) are acceptable trade-offs.

LMV324MT/NOPB (Texas Instruments) — Active product status. Meets all primary criteria with identical 14-TSSOP package and -40°C to 125°C operating range. Supply voltage range 2.7 V to 5.5 V is compatible. Superior slew rate (1 V/µs) and higher output current capability (160 mA) support higher-current applications. Higher supply current (410 µA) represents increased power consumption.

LMV324QPWR (Texas Instruments) — Active product status. Meets all primary criteria with identical 14-TSSOP package and -40°C to 125°C operating range. Supply voltage range 2.7 V to 5.5 V is compatible. Identical electrical characteristics to LMV324MT/NOPB with reduced output current per channel (40 mA vs. 70 mA). Suitable for applications not requiring high output current.

ISL28413FVZ (Renesas Electronics Corporation) — Active product status. Meets all primary criteria with identical 14-TSSOP package and -40°C to 125°C operating range. Supply voltage range 1.8 V to 5.5 V extends lower-voltage capability. Superior performance characteristics: slew rate 1 V/µs, gain bandwidth product 2 MHz, input bias current 3 pA, input offset voltage 500 µV. Lower output current per channel (22 mA) limits high-current applications.

Conditional Substitutes (Temperature or Supply Voltage Limitations):

APX324TSG-13 (Diodes Incorporated) — Active product status. Meets primary criteria with identical 14-TSSOP package. Operating temperature range limited to -40°C to 85°C (vs. -40°C to 125°C). Suitable for applications not requiring operation above 85°C. Supply voltage range 2.5 V to 5.5 V is compatible.

LMR934FVJ-E2 (Rohm Semiconductor) — Active product status. Meets primary criteria with identical 14-TSSOP package. Operating temperature range limited to -40°C to 85°C. Supply voltage range limited to 1.8 V to 5 V (maximum 5 V vs. 5.5 V). Suitable for applications operating within these constraints. Lower slew rate (0.35 V/µs) may limit high-frequency applications.

BD12734FVJ-E2 (Rohm Semiconductor) — Active product status. Meets primary criteria with identical 14-TSSOP package. Operating temperature range limited to -40°C to 85°C. Supply voltage range limited to 1.8 V to 5 V. Significantly lower output current per channel (12 mA vs. 70 mA) restricts high-current applications. Lower slew rate (0.4 V/µs) and lower gain bandwidth product (1 MHz) may limit frequency response.

Not Recommended as Direct Substitutes (Amplifier Type Mismatch):

BU7487FV-E2 (Rohm Semiconductor) — CMOS amplifier type (vs. general-purpose). Package variant 14-LSSOP differs from 14-TSSOP. Product status Active. While electrically compatible in many applications, the CMOS architecture introduces different input bias characteristics (1 pA vs. 27 nA) and may require circuit redesign.

LMV344IPW (Texas Instruments) — CMOS amplifier type (vs. general-purpose). Product status Last Time Buy indicates manufacturing discontinuation. CMOS architecture introduces different input bias characteristics (1 pA vs. 27 nA). Not recommended for new designs.

LMV344IPWR (Texas Instruments) — CMOS amplifier type (vs. general-purpose). Product status Active. CMOS architecture introduces different input bias characteristics (1 pA vs. 27 nA). Suitable only for applications specifically designed for CMOS input characteristics.

Frequently Asked Questions (FAQ)

Q: Can I substitute the LMX324IPT with any of the listed parts without circuit modification?

A: Direct substitution without modification is possible with LMV324TSG-13, LMV324MT/NOPB, LMV324QPWR, and ISL28413FVZ. These parts maintain identical 14-TSSOP packaging, rail-to-rail output configuration, and 4-circuit architecture. Verify that your application does not depend on the specific slew rate, gain bandwidth product, or output current characteristics of the LMX324IPT. Parts with superior performance characteristics (higher slew rate, higher bandwidth, lower offset voltage) are generally compatible with designs optimized for the LMX324IPT.

Q: What are the key differences between the LMX324IPT and LMV324TSG-13?

A: Both devices are general-purpose quad operational amplifiers in 14-TSSOP packages with rail-to-rail output and -40°C to 125°C operating range. LMV324TSG-13 offers superior slew rate (1 V/µs vs. 0.7 V/µs), lower input offset voltage (1.7 mV vs. 4 mV), and higher output current capability (90 mA vs. 70 mA). LMV324TSG-13 requires higher supply current (340 µA vs. 130 µA). Both are Active products with identical RoHS3 compliance and MSL 1 rating.

Q: Why is the operating temperature range important for substitution?

A: The LMX324IPT operates from -40°C to 125°C. Substitute parts with reduced temperature ranges (such as APX324TSG-13 and LMR934FVJ-E2, limited to -40°C to 85°C) are suitable only for applications that do not require operation above 85°C. If your design requires the full -40°C to 125°C range, select only substitutes with matching or extended temperature specifications.

Q: Can I use a CMOS amplifier (BU7487FV-E2, LMV344IPW, LMV344IPWR) as a substitute for the LMX324IPT?

A: CMOS amplifiers have fundamentally different input bias characteristics (picoampere range vs. nanoampere range for general-purpose amplifiers). While CMOS devices may be electrically compatible in many applications, they introduce different input impedance and bias current behavior. Use CMOS substitutes only if your circuit design specifically accommodates CMOS input characteristics or if the application is insensitive to input bias current differences.

Q: What is the significance of the 14-TSSOP package specification?

A: The 14-TSSOP (Thin Shrink Small Outline Package) is a surface-mount package with 0.173-inch width and 4.40 mm body width. All listed general-purpose substitutes use identical 14-TSSOP packaging, ensuring mechanical and electrical compatibility with existing PCB layouts and solder reflow processes. The CMOS variant BU7487FV-E2 uses 14-LSSOP packaging, which differs slightly and may not be compatible with existing footprints.

Q: How do I determine if a substitute part's supply current specification is acceptable?

A: The LMX324IPT specifies 130 µA total supply current for all 4 channels. Substitute parts with higher supply current (such as LMV324MT/NOPB at 410 µA) increase power consumption but do not affect circuit functionality. Verify that your power supply and thermal design can accommodate the higher current draw. Parts with lower supply current (such as ISL28413FVZ at 90 µA) reduce power consumption and are generally preferred in battery-powered or thermally constrained applications.

Q: What does "Last Time Buy" product status mean for the LMV344IPW?

A: Last Time Buy status indicates that the manufacturer has announced the end of production for this device. Existing inventory may be available, but no new manufacturing runs are planned. LMV344IPW should not be selected for new designs. Use Active-status alternatives such as LMV344IPWR (identical specifications) or other Active general-purpose substitutes.

Q: Are there any compliance or certification differences between the LMX324IPT and substitute parts?

A: All listed parts are RoHS3 compliant and REACH unaffected. The LMX324IPT has MSL 1 (Unlimited moisture sensitivity), while some substitutes have higher MSL ratings (MSL 2 or MSL 3). MSL 1 parts have no moisture sensitivity restrictions and can be stored indefinitely. MSL 2 and MSL 3 parts require controlled storage conditions (1 year and 168 hours, respectively) before soldering. For applications with extended storage requirements, prioritize MSL 1 parts.

Q: Can I use ISL28413FVZ in applications requiring output current greater than 22 mA per channel?

A: ISL28413FVZ specifies 22 mA maximum output current per channel, compared to 70 mA for the LMX324IPT. If your application requires output currents exceeding 22 mA per channel, ISL28413FVZ is not suitable. Select alternatives with higher output current capability: LMV324TSG-13 (90 mA), LMV324MT/NOPB (160 mA), or LMR934FVJ-E2 (90 mA).

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