LMV7271MGX Equivalent & Substitute Parts

Part Overview

The LMV7271MGX is a general-purpose CMOS comparator manufactured by Texas Instruments, featuring push-pull, rail-to-rail output in a 5-pin SC-70 surface-mount package. The device operates across a wide supply voltage range of 1.8V to 5.5V (single supply) or ±0.9V to ±2.75V (dual supply), making it suitable for low-voltage analog signal comparison applications.

The LMV7271MGX is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support. Substitute parts must maintain electrical compatibility within the specified parameter tolerances and physical compatibility with the existing PCB footprint.

Key Parameters

Parameter	Value	Unit
Supply Voltage (Single/Dual)	1.8V ~ 5.5V / ±0.9V ~ 2.75V	V
Input Offset Voltage (Max)	4	mV @ 5V
Input Bias Current (Max)	0.01	µA @ 5V
Quiescent Current (Max)	14	µA
CMRR / PSRR (Typ)	78dB / 80dB	dB
Propagation Delay (Max)	2.1	µs
Operating Temperature	-40°C ~ 85°C	°C
Package / Case	5-TSSOP, SC-70-5, SOT-353	—
Output Type	CMOS, Push-Pull, Rail-to-Rail	—
Number of Elements	1	—

Substitute Part Grouping Explanation

Substitute parts for the LMV7271MGX are categorized based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications and package form factor (SC-70-5). These parts are direct replacements with no design modifications required:

LMV7271MG/NOPB
LMV7271MGX/NOPB

Manufacturer-Recommended Substitutes provide functional equivalence within acceptable parameter tolerances. Substitution is valid when the following criteria are met:

Supply voltage range encompasses the original specification
Input offset voltage, input bias current, and quiescent current remain within acceptable limits for the application
Propagation delay does not exceed application timing requirements
Package footprint is compatible with existing PCB layout
Operating temperature range covers the intended application environment

Substitutes are grouped by package compatibility:

SC-70-5 Package (Pin-Compatible): ADCMP371AKSZ-REEL7
SOT-23-5 Package (Footprint Modification Required): MAX9140EUK+T, MCP6561RT-E/OT
8-Pin Packages (Layout Redesign Required): MAX941CSA+T, MAX941ESA+, MAX941EUA+T
SOT-23-6 Package (Layout Redesign Required): MCP65R41T-1202E/CHY, MCP65R41T-2402E/CHY

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Propagation Delay (Max)	Package	Product Status
LMV7271MGX	Texas Instruments	1.8V ~ 5.5V	4mV @ 5V	0.01µA @ 5V	14µA	2.1µs	SC-70-5	Obsolete
LMV7271MG/NOPB	Texas Instruments	1.8V ~ 5.5V	4mV @ 5V	0.01µA @ 5V	14µA	2.1µs	SC-70-5	Active
LMV7271MGX/NOPB	Texas Instruments	1.8V ~ 5.5V	4mV @ 5V	0.01µA @ 5V	14µA	2.1µs	SC-70-5	Active
ADCMP371AKSZ-REEL7	Analog Devices Inc.	2.25V ~ 5.5V	9mV @ 5.5V	0.05µA @ 5.5V	7µA	5µs	SC-70-5	Active
MAX9140EUK+T	Analog Devices Inc./Maxim Integrated	2.7V ~ 5.5V	2mV @ 5V	0.32µA @ 5V	300µA	40ns	SOT-23-5	Active
MAX941CSA+T	Analog Devices Inc./Maxim Integrated	2.7V ~ 5.5V	2mV @ 5.5V	0.15µA @ 5.5V	700µA	80ns	8-SOIC	Active
MAX941ESA+	Analog Devices Inc./Maxim Integrated	2.7V ~ 5.5V	2mV @ 5.5V	0.15µA @ 5.5V	700µA	80ns	8-SOIC	Active
MAX941EUA+T	Analog Devices Inc./Maxim Integrated	2.7V ~ 5.5V	3mV @ 5.5V	0.15µA @ 5.5V	700µA	80ns	8-uMAX/uSOP	Active
MCP6561RT-E/OT	Microchip Technology	1.8V ~ 5.5V	10mV @ 5.5V	1pA @ 5.5V	130µA	80ns	SOT-23-5	Active
MCP65R41T-1202E/CHY	Microchip Technology	1.8V ~ 5.5V	10mV @ 5.5V	1pA @ 5.5V	4µA	8µs	SOT-23-6	Active
MCP65R41T-2402E/CHY	Microchip Technology	1.8V ~ 5.5V	10mV @ 5.5V	1pA @ 5.5V	4µA	8µs	SOT-23-6	Active

Engineering Selection Recommendations

Direct Replacement (No PCB Modification):

LMV7271MG/NOPB and LMV7271MGX/NOPB are parametric equivalents of the obsolete LMV7271MGX. Both parts maintain identical electrical specifications and SC-70-5 package compatibility. LMV7271MGX/NOPB offers higher inventory availability (20,626 units) compared to LMV7271MG/NOPB (4,930 units). Both parts are RoHS3 compliant and carry Active product status, ensuring long-term supply continuity.

Pin-Compatible Substitute (SC-70-5 Package):

ADCMP371AKSZ-REEL7 (Analog Devices Inc.) maintains the SC-70-5 package footprint, eliminating PCB redesign requirements. This part operates within a narrower supply voltage range (2.25V ~ 5.5V) and exhibits higher input offset voltage (9mV) and propagation delay (5µs) compared to the original specification. The quiescent current is lower (7µA). This substitute is suitable for applications where the reduced supply voltage range and increased propagation delay are acceptable. RoHS3 compliant, Active status.

Footprint-Modified Substitutes (SOT-23-5 Package):

MAX9140EUK+T and MCP6561RT-E/OT require PCB layout modification due to different package geometry. MAX9140EUK+T offers superior propagation delay (40ns) and lower input offset voltage (2mV) but exhibits significantly higher quiescent current (300µA). MCP6561RT-E/OT maintains the 1.8V ~ 5.5V supply range and provides extremely low input bias current (1pA) but has higher input offset voltage (10mV) and quiescent current (130µA). Both are RoHS3 compliant and Active status.

Multi-Pin Substitutes (8-Pin Packages):

MAX941 series parts (MAX941CSA+T, MAX941ESA+, MAX941EUA+T) require significant PCB redesign due to 8-pin package configuration. These parts feature integrated latch and shutdown functionality not present in the original device. Operating temperature range for MAX941CSA+T is limited to 0°C ~ 70°C. All MAX941 variants exhibit substantially higher quiescent current (700µA). These substitutes are suitable only when additional latch functionality is beneficial to the application. All are RoHS3 compliant and Active status.

Integrated Reference Substitutes (SOT-23-6 Package):

MCP65R41T-1202E/CHY and MCP65R41T-2402E/CHY integrate voltage reference functionality and require PCB redesign. These parts maintain the 1.8V ~ 5.5V supply range and offer extremely low input bias current (1pA) and quiescent current (4µA). Input offset voltage is higher (10mV) and propagation delay is longer (8µs). These substitutes are applicable only when integrated voltage reference capability is required. Both are RoHS3 compliant and Active status.

Frequently Asked Questions (FAQ)

Q: Can LMV7271MGX be replaced directly with LMV7271MG/NOPB or LMV7271MGX/NOPB without PCB modification?

A: Yes. Both parts are parametric equivalents with identical electrical specifications and SC-70-5 package compatibility. No design changes are required. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. tube).

Q: What is the key limitation of ADCMP371AKSZ-REEL7 as a substitute?

A: The supply voltage range is narrower (2.25V ~ 5.5V vs. 1.8V ~ 5.5V). Applications requiring operation below 2.25V single supply are not compatible. Additionally, propagation delay is longer (5µs vs. 2.1µs), which may affect timing-critical circuits.

Q: Why do MAX9140 and MAX941 series parts require PCB redesign?

A: These parts use different package types (SOT-23-5 and 8-pin packages respectively) with different pin counts and physical dimensions compared to the SC-70-5 package. PCB layout, routing, and component placement must be modified accordingly.

Q: Can MCP6561RT-E/OT be used as a direct substitute?

A: MCP6561RT-E/OT requires PCB modification due to SOT-23-5 package geometry. However, it maintains the 1.8V ~ 5.5V supply range and offers superior input bias current performance (1pA). Propagation delay is significantly faster (80ns vs. 2.1µs), which may require circuit timing verification.

Q: What is the difference between MCP65R41T-1202E/CHY and MCP65R41T-2402E/CHY?

A: Both parts are functionally identical in electrical performance and package type (SOT-23-6). The part number suffix indicates different internal voltage reference configurations. Selection depends on the specific reference voltage required by the application circuit.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification. The original LMV7271MGX is RoHS non-compliant, making RoHS3-compliant substitutes necessary for applications subject to RoHS regulations.

Q: Which substitute offers the lowest quiescent current?

A: MCP65R41T-1202E/CHY and MCP65R41T-2402E/CHY both offer 4µA quiescent current, compared to 14µA for the original LMV7271MGX. However, these parts integrate voltage reference functionality and require PCB redesign.

Q: Can MAX941 series parts be used in applications requiring the original operating temperature range of -40°C ~ 85°C?

A: MAX941CSA+T is limited to 0°C ~ 70°C operating temperature. MAX941ESA+ and MAX941EUA+T support -40°C ~ 85°C. Verify temperature requirements before selection.

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