LMV641MFX/NOPB Equivalent & Substitute Parts

Part Overview

The LMV641MFX/NOPB is a general-purpose operational amplifier manufactured by Texas Instruments, packaged in SOT-23-5 (SC-74A) surface mount configuration. This single-circuit, rail-to-rail output amplifier operates across a 2.7 V to 12 V supply range and is rated for -40°C to 125°C operating temperature. The device is ROHS3 compliant and carries active product status. Substitute parts are identified when equivalent functional performance is required, inventory constraints exist, or alternative sourcing is necessary while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	2.6	V/µs
Gain Bandwidth Product	10	MHz
Current - Input Bias	70	nA
Voltage - Input Offset	30	µV
Current - Supply	158	µA
Current - Output / Channel	112	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	-40 to 125	°C
Package / Case	SC-74A, SOT-753	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LMV641MFX/NOPB are identified based on the following criteria:

Mechanical Compatibility: All substitute parts maintain identical package configuration (SOT-23-5, SC-74A, SOT-753) and surface mount mounting type, ensuring direct PCB footprint compatibility.

Functional Classification: All substitutes are single-circuit, general-purpose, rail-to-rail output operational amplifiers, matching the core functional category.

Electrical Parameter Ranges: Substitutes operate within overlapping supply voltage ranges (minimum 2.5 V to 2.7 V; maximum 10 V to 12 V) and maintain compatible operating temperature ranges (-40°C minimum across all parts).

Compliance & Certification: All substitute parts carry ROHS3 compliance, MSL Level 1 (Unlimited), REACH Unaffected status, and active product status, matching the regulatory profile of the main part.

Key Differentiators: Substitute parts vary in slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and maximum operating temperature. These variations determine suitability for specific application requirements.

Parameter Comparison

Parameter	LMV641MFX/NOPB	TS931AILT	TS931BILT	TS931ILT	TS941AILT	TS941ILT
Manufacturer	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	2.6	0.05	0.05	0.05	0.0045	0.0045
Gain Bandwidth Product (MHz/kHz)	10 MHz	100 kHz	100 kHz	100 kHz	10 kHz	10 kHz
Current - Input Bias (nA/pA)	70 nA	1 pA	1 pA	1 pA	1 pA	1 pA
Voltage - Input Offset (µV/mV)	30 µV	5 mV	2 mV	10 mV	5 mV	10 mV
Current - Supply (µA)	158	20	20	20	1.2	1.2
Current - Output / Channel (mA)	112	5	5	5	5	5
Voltage - Supply Span (Min) (V)	2.7	2.7	2.7	2.7	2.5	2.5
Voltage - Supply Span (Max) (V)	12	10	10	10	10	10
Operating Temperature (°C)	-40 to 125	-40 to 105	-40 to 105	-40 to 105	-40 to 85	-40 to 85
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TS931 Series (TS931AILT, TS931BILT, TS931ILT): These STMicroelectronics parts maintain full compliance with ROHS3, MSL Level 1, and REACH requirements. The TS931 series operates within the 2.7 V to 10 V supply range, which overlaps with the LMV641MFX/NOPB specification. Operating temperature range extends to 105°C, supporting most industrial applications. The TS931BILT variant offers the lowest input offset voltage (2 mV) among the TS931 series. All three variants carry active product status and are available in high inventory quantities.

TS941 Series (TS941AILT, TS941ILT): These STMicroelectronics parts provide ultra-low supply current (1.2 µA) and are suitable for battery-powered or low-power applications. The TS941 series operates within the 2.5 V to 10 V supply range and maintains full regulatory compliance. Operating temperature range extends to 85°C. Both variants carry active product status. The TS941AILT offers lower input offset voltage (5 mV) compared to TS941ILT (10 mV).

Regulatory & Compliance Alignment: All substitute parts maintain identical RoHS3 compliance, MSL Level 1 (Unlimited) moisture sensitivity, and REACH Unaffected status as the main part. All parts carry active product status, ensuring continued availability and support.

Supply Voltage Consideration: Applications requiring the full 12 V maximum supply of the LMV641MFX/NOPB must account for the 10 V maximum rating of all STMicroelectronics substitutes. The TS941 series minimum supply voltage is 2.5 V, compared to 2.7 V for the LMV641MFX/NOPB and TS931 series.

Temperature Range Consideration: Applications operating above 105°C require the LMV641MFX/NOPB (rated to 125°C). Applications limited to 85°C or below may use TS941 series parts. Applications requiring operation to 105°C may use TS931 series parts.

Frequently Asked Questions (FAQ)

Q: Can TS931AILT, TS931BILT, or TS931ILT be used as direct replacements for LMV641MFX/NOPB?

A: Direct PCB footprint replacement is supported due to identical SOT-23-5 packaging. Electrical compatibility depends on application requirements. The TS931 series operates within a 2.7 V to 10 V supply range, compared to the LMV641MFX/NOPB range of 2.7 V to 12 V. Applications using supply voltages above 10 V require the LMV641MFX/NOPB. The TS931 series exhibits lower slew rate (0.05 V/µs vs. 2.6 V/µs) and lower gain bandwidth product (100 kHz vs. 10 MHz), which may affect high-frequency performance.

Q: What are the key differences between TS931AILT, TS931BILT, and TS931ILT?

A: All three variants share identical electrical performance except for input offset voltage specifications. TS931BILT offers the tightest input offset voltage specification (2 mV), followed by TS931AILT (5 mV) and TS931ILT (10 mV). All three operate at identical slew rate (0.05 V/µs), gain bandwidth product (100 kHz), supply current (20 µA), and output current (5 mA). Packaging and compliance certifications are identical across all three variants.

Q: When should TS941AILT or TS941ILT be selected over TS931 series parts?

A: TS941 series parts are selected for applications requiring ultra-low supply current consumption (1.2 µA vs. 20 µA for TS931 series). This makes TS941 parts suitable for battery-powered devices or energy-harvesting applications. TS941 parts operate at lower slew rate (0.0045 V/µs) and lower gain bandwidth product (10 kHz), which restricts use to low-frequency signal conditioning. Operating temperature range is limited to 85°C maximum.

Q: Are all substitute parts available in the same packaging options as LMV641MFX/NOPB?

A: All substitute parts use identical SOT-23-5 (SC-74A, SOT-753) surface mount packaging. Packaging format differs: LMV641MFX/NOPB is supplied in standard packaging, TS931AILT and TS931ILT are supplied in Tape & Reel (TR) format, TS931BILT and TS941 series are supplied in Cut Tape (CT) & Digi-Reel® format. These format differences do not affect PCB compatibility or electrical performance.

Q: Do all substitute parts meet the same compliance and regulatory requirements?

A: All substitute parts carry ROHS3 compliance, MSL Level 1 (Unlimited) moisture sensitivity rating, and REACH Unaffected status, matching the LMV641MFX/NOPB regulatory profile. All parts carry active product status, ensuring continued manufacturing support and availability.

Q: What is the impact of lower slew rate in TS931 and TS941 series on circuit performance?

A: Slew rate determines the maximum rate of voltage change at the amplifier output. The LMV641MFX/NOPB slew rate of 2.6 V/µs supports faster signal transitions compared to TS931 series (0.05 V/µs) and TS941 series (0.0045 V/µs). Applications requiring high-speed signal conditioning, audio amplification, or fast transient response may experience performance degradation with lower slew rate substitutes. Low-frequency applications such as sensor signal conditioning or precision DC amplification are unaffected by slew rate differences.

Q: What is the impact of lower gain bandwidth product in substitute parts?

A: Gain bandwidth product (GBW) determines the frequency response of the amplifier. The LMV641MFX/NOPB GBW of 10 MHz supports applications up to approximately 10 MHz signal frequency. TS931 series GBW of 100 kHz limits operation to approximately 100 kHz signal frequency. TS941 series GBW of 10 kHz limits operation to approximately 10 kHz signal frequency. Applications requiring bandwidth above these limits require the LMV641MFX/NOPB or alternative high-bandwidth amplifiers.

Q: Can TS941 series parts be used in applications requiring operation above 85°C?

A: No. TS941AILT and TS941ILT are rated for -40°C to 85°C operating temperature. Applications requiring operation above 85°C must use LMV641MFX/NOPB (rated to 125°C) or TS931 series parts (rated to 105°C).

Q: What inventory considerations apply to substitute part selection?

A: Current inventory levels are: LMV641MFX/NOPB (3,605 pcs), TS931AILT (23,250 pcs), TS931BILT (9,704 pcs), TS931ILT (24,788 pcs), TS941AILT (29,300 pcs), TS941ILT (17,170 pcs). TS941AILT offers the highest inventory availability. TS931 series parts offer moderate to high availability. Inventory levels should be verified at time of procurement.

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