LMX321ILT Equivalent & Substitute Parts

Part Overview

The LMX321ILT is a general-purpose operational amplifier manufactured by STMicroelectronics, housed in a SOT-23-5 surface mount package. This rail-to-rail output amplifier operates across a supply voltage range of 2.3 V to 5.5 V and is rated for temperatures from -40°C to 125°C. The device is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges. Alternative models may be required due to component availability, supply chain considerations, or design optimization needs while maintaining functional equivalence.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	0.7	V/µs
Gain Bandwidth Product	1.3	MHz
Current - Input Bias	27	nA
Voltage - Input Offset	4	mV
Current - Supply	130	µA
Current - Output / Channel	70	mA
Voltage - Supply Span (Min)	2.3	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 125	°C
Package / Case	SC-74A, SOT-753	—
Supplier Device Package	SOT-23-5	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the LMX321ILT is determined by the following critical parameters:

Electrical Compatibility Requirements:

Amplifier Type: General Purpose
Number of Circuits: 1
Output Type: Rail-to-Rail
Supply Voltage Range: Minimum 2.3 V, Maximum 5.5 V
Operating Temperature Range: -40°C to 125°C (or compatible subset)

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: SC-74A, SOT-753 or equivalent footprint
Supplier Device Package: SOT-23-5 or compatible pinout

Performance Parameters: Substitute parts must maintain functional equivalence within the following ranges:

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 or lower
Current - Output / Channel: 70 mA or greater

Parts meeting these criteria are classified as direct substitutes. Parts with package variations (SOT-25) or extended temperature ranges are noted for application-specific compatibility assessment.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
LMX321ILT	STMicroelectronics	0.7	1.3	27	4	130	70	2.3	5.5	-40 to 125	SOT-23-5	Active
AZV321KTR-G1	Diodes Incorporated	1	1	250	1.7	130	160	2.7	5.5	-40 to 85	SOT-23-5	Active
BU7241G-TR	Rohm Semiconductor	0.4	0.9	1	1	70	12	1.8	5.5	-40 to 85	5-SSOP	Active
LMV321IDBVT	Texas Instruments	1	1	15	1.7	130	—	2.7	5.5	-40 to 125	SOT-23-5	Active
LMV321M5/NOPB	Texas Instruments	1	1	15	1.7	130	160	2.7	5.5	-40 to 85	SOT-23-5	Active
LMV321Q1M5/NOPB	Texas Instruments	1	1	15	1.7	130	—	2.7	5.5	-40 to 125	SOT-23-5	Active
LMV321WG-7	Diodes Incorporated	1	1	15	1.7	110	90	2.7	5.5	-40 to 85	SOT-25	Active
LMV821M5/NOPB	National Semiconductor	2	5.6	100	3.5	300	45	2.5	5.5	-40 to 85	SOT-23-5	Active
LMV821M5X/NOPB	National Semiconductor	2	5.6	100	3.5	300	—	2.5	5.5	-40 to 85	SOT-23-5	Active
LMV931MF/NOPB	Texas Instruments	0.42	1.5	14	1	116	100	1.8	5.5	-40 to 125	SOT-23-5	Active
LMV931MFX	Texas Instruments	0.42	1.5	14	1	116	100	1.8	5.5	-40 to 125	SOT-23-5	Last Time Buy

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

The following parts maintain full electrical and mechanical compatibility with the LMX321ILT across all critical parameters:

LMV321IDBVT (Texas Instruments): Identical supply current, extended temperature range to 125°C, improved input bias current (15 nA), SOT-23-5 package, active status.
LMV321Q1M5/NOPB (Texas Instruments): Automotive-grade variant with AEC-Q100 qualification, extended temperature range to 125°C, improved input bias current (15 nA), SOT-23-5 package, active status.

Compatible Substitutes (Parameter Trade-offs):

AZV321KTR-G1 (Diodes Incorporated): Meets electrical requirements with improved slew rate (1 V/µs) and output current (160 mA). Operating temperature limited to 85°C. SOT-23-5 package, active status.
LMV321M5/NOPB (Texas Instruments): Meets electrical requirements with improved slew rate (1 V/µs) and output current (160 mA). Operating temperature limited to 85°C. SOT-23-5 package, active status.
LMV931MF/NOPB (Texas Instruments): Improved gain bandwidth product (1.5 MHz), lower input offset voltage (1 mV), extended temperature range to 125°C. Lower minimum supply voltage (1.8 V). SOT-23-5 package, active status.
LMV931MFX (Texas Instruments): Identical specifications to LMV931MF/NOPB. Last Time Buy status indicates limited future availability.

Package Variant:

LMV321WG-7 (Diodes Incorporated): SOT-25 package variant with equivalent electrical performance. Requires PCB layout modification. Operating temperature limited to 85°C. Active status.

Limited Compatibility:

BU7241G-TR (Rohm Semiconductor): 5-SSOP package requires different PCB footprint. Output current (12 mA) below LMX321ILT specification. Slew rate (0.4 V/µs) and gain bandwidth product (0.9 MHz) below specification. Operating temperature limited to 85°C.
LMV821M5/NOPB and LMV821M5X/NOPB (National Semiconductor): Supply current (300 µA) exceeds specification. Operating temperature limited to 85°C. Higher power consumption may impact system design.

Compliance Status:

All listed substitutes maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity levels vary; LMX321ILT and most substitutes carry MSL 1 (Unlimited) rating, while AZV321KTR-G1 and LMV321WG-7 carry MSL 3 (168 Hours).

Frequently Asked Questions (FAQ)

Q: Can LMV321IDBVT directly replace LMX321ILT in all applications?

A: LMV321IDBVT meets all electrical and mechanical compatibility requirements. Both devices operate across the 2.7 V to 5.5 V supply range, maintain rail-to-rail output, and support the -40°C to 125°C temperature range. The SOT-23-5 package is identical. Substitution is valid without circuit modification.

Q: What is the difference between LMV321M5/NOPB and LMV321IDBVT?

A: Both are Texas Instruments LMV321 variants in SOT-23-5 packages with identical electrical specifications. The primary difference is operating temperature range: LMV321IDBVT supports -40°C to 125°C, while LMV321M5/NOPB is rated to -40°C to 85°C. Select based on application temperature requirements.

Q: Why is BU7241G-TR listed as a substitute if it has lower output current?

A: BU7241G-TR is included for reference due to matching amplifier type and rail-to-rail output. However, the 12 mA output current specification falls below the LMX321ILT requirement of 70 mA. This part is not recommended for direct substitution in applications requiring higher output current.

Q: Can I use LMV321WG-7 as a substitute?

A: LMV321WG-7 is electrically compatible but uses a SOT-25 package instead of SOT-23-5. This requires PCB layout modification and different footprint design. Electrical performance is equivalent. Use only if PCB redesign is feasible.

Q: What does "Last Time Buy" status mean for LMV931MFX?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory is available, but future production is not planned. For new designs, select LMV931MF/NOPB (active status) or other active-status alternatives to ensure long-term supply availability.

Q: Are there temperature range limitations I should consider?

A: LMX321ILT operates to 125°C. Substitutes with 85°C maximum ratings (AZV321KTR-G1, LMV321M5/NOPB, LMV821 variants, LMV321WG-7) are suitable only for applications not exceeding 85°C. For full temperature range compatibility, select LMV321IDBVT, LMV321Q1M5/NOPB, LMV931MF/NOPB, or LMV931MFX.

Q: What is the significance of AEC-Q100 qualification on LMV321Q1M5/NOPB?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability standards. LMV321Q1M5/NOPB is suitable for automotive applications requiring this certification. Non-automotive applications do not require this qualification.

Q: How do I determine if a substitute will work in my circuit?

A: Verify the following: (1) Supply voltage range encompasses your application voltage; (2) Operating temperature range includes your maximum and minimum operating temperatures; (3) Output current requirement does not exceed the part specification; (4) Package footprint matches your PCB design or redesign is acceptable; (5) Slew rate and gain bandwidth product meet your signal processing requirements.

Q: What is the difference between moisture sensitivity levels?

A: MSL 1 (Unlimited) indicates the part has no moisture sensitivity restrictions and can be stored indefinitely before soldering. MSL 3 (168 Hours) requires the part to be soldered within 168 hours of package opening or after reflow exposure. For high-volume production or extended storage, MSL 1 parts are preferred.

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