LMV331M5 Equivalent & Substitute Parts

Part Overview

The LMV331M5 is a general-purpose CMOS comparator manufactured by Texas Instruments in SOT-23-5 surface mount packaging. This device operates across a 2.7V to 5.5V supply range with open-collector TTL output configuration, designed for low-power comparison applications requiring fast response times. The LMV331M5 carries Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Supply Voltage Range	2.7V ~ 5.5V	V
Input Offset Voltage (Max)	7mV @ 5V	mV
Input Bias Current (Max)	0.25µA @ 5V	µA
Output Current (Typ)	84mA @ 5V	mA
Quiescent Current (Max)	120µA	µA
Propagation Delay (Max)	600ns	ns
Operating Temperature	-40°C ~ 85°C	°C
Package Type	SOT-23-5	—
Output Type	CMOS, Open-Collector, TTL	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the LMV331M5 is determined by the following critical parameters:

Primary Substitution Criteria:

Supply voltage range must encompass or match 2.7V ~ 5.5V
Output type must support open-collector or equivalent switching capability
Package must be SOT-23-5 or mechanically compatible surface mount variant
Input offset voltage and bias current must remain within acceptable tolerance windows
Operating temperature range must cover -40°C ~ 85°C minimum
Propagation delay must not exceed 600ns for timing-critical applications

Substitution Categories:

Parametric Equivalents maintain identical electrical specifications and packaging, differing only in product status or packaging format (Cut Tape vs. Digi-Reel). These provide direct drop-in replacement capability.

Upgrade Substitutes offer enhanced performance characteristics (lower propagation delay, extended temperature range) while maintaining core functional compatibility. These require design verification for timing-sensitive circuits.

Manufacturer Recommended Alternatives from different manufacturers meet the core electrical requirements but may introduce minor parameter variations (input offset, quiescent current) that require circuit-level evaluation.

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current	Quiescent Current (Max)	Propagation Delay (Max)	Operating Temp	Package	Product Status
LMV331M5	Texas Instruments	2.7V ~ 5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	120µA	600ns	-40°C ~ 85°C	SOT-23-5	Last Time Buy
LMV331M5/NOPB	Texas Instruments	2.7V ~ 5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	120µA	600ns	-40°C ~ 85°C	SOT-23-5	Active
LMV331M5X/NOPB	Texas Instruments	2.7V ~ 5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	120µA	600ns	-40°C ~ 85°C	SOT-23-5	Active
LMV331W5-7	Diodes Incorporated	2.7V ~ 5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	200µA	450ns	-40°C ~ 125°C	SOT-25	Active
LMV331SN3T1G	onsemi	2.7V ~ 5V	9mV @ 5V	0.001µA @ 5V	84mA @ 5V	150µA	1.5µs	-40°C ~ 85°C	5-TSOP	Active
MAX9021AUK+T	Analog Devices Inc./Maxim Integrated	2.5V ~ 5.5V, ±1.25V ~ 2.75V	1mV @ 5V	0.003µA @ 5V	—	5µA	8µs	-40°C ~ 125°C	SOT-23-5	Active
TS391ILT	STMicroelectronics	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1.25mA	—	-40°C ~ 125°C	SOT-23-5	Active
TS391IQ2T	STMicroelectronics	2V ~ 36V, ±1V ~ 18V	1mV @ 5V	0.25µA @ 5V	16mA @ 5V	500µA	—	-40°C ~ 125°C	8-DFN (2x2)	Active
TS391RILT	STMicroelectronics	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	1.25mA	—	-40°C ~ 125°C	SOT-23-5	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): LMV331M5/NOPB and LMV331M5X/NOPB are parametric equivalents with identical electrical specifications. Both maintain Active product status with Texas Instruments, ensuring long-term availability. These parts differ only in packaging format (Cut Tape vs. Digi-Reel) and inventory levels. Selection between these should be based on procurement volume and supply chain requirements. Both are ROHS3 compliant with MSL 1 rating.

Performance-Enhanced Upgrade: LMV331W5-7 from Diodes Incorporated offers improved propagation delay (450ns vs. 600ns) and extended operating temperature range (-40°C ~ 125°C). The trade-off is increased quiescent current (200µA vs. 120µA). This substitute is suitable for applications where faster response time is beneficial and power consumption is not critical. Package is SOT-25, requiring PCB layout verification for pin compatibility.

Alternative Architectures: TS391 series comparators from STMicroelectronics (TS391ILT, TS391IQ2T, TS391RILT) provide wider supply voltage ranges (2V ~ 36V) and extended temperature ratings. However, these introduce higher quiescent current consumption (500µA to 1.25mA) and reduced output current capability (16mA vs. 84mA). Selection requires circuit-level analysis to confirm compatibility with existing load requirements. TS391IQ2T uses 8-DFN packaging, necessitating PCB redesign.

Premium Alternative: MAX9021AUK+T from Analog Devices Inc./Maxim Integrated offers superior input offset voltage (1mV) and extremely low quiescent current (5µA), making it suitable for precision and ultra-low-power applications. Extended temperature range (-40°C ~ 125°C) and dual supply capability provide design flexibility. Propagation delay (8µs) is significantly longer, limiting use in high-speed comparison circuits. SOT-23-5 packaging enables direct PCB substitution.

onsemi Alternative: LMV331SN3T1G provides Active status with extremely low input bias current (0.001µA). Supply voltage range is slightly reduced (2.7V ~ 5V). Propagation delay (1.5µs) exceeds the original specification. 5-TSOP packaging differs from SOT-23-5, requiring PCB layout modification.

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original LMV331M5.

Frequently Asked Questions (FAQ)

Q: Can LMV331M5/NOPB be used as a direct replacement for LMV331M5? A: Yes. LMV331M5/NOPB is a parametric equivalent with identical electrical specifications and SOT-23-5 packaging. The primary difference is product status (Active vs. Last Time Buy) and packaging format. No circuit modifications are required.

Q: What is the key difference between LMV331M5X/NOPB and LMV331M5/NOPB? A: Both parts are parametrically identical. LMV331M5X/NOPB is available in higher inventory quantities (20,200 pcs vs. 2,400 pcs) and may be offered in Digi-Reel packaging format. Selection depends on procurement volume and supply chain logistics.

Q: Can I use TS391ILT instead of LMV331M5 in a 5V single-supply circuit? A: TS391ILT is functionally compatible in 5V applications due to its 2V ~ 36V supply range. However, quiescent current is significantly higher (1.25mA vs. 120µA), which may impact power budget in battery-powered designs. Output current is also reduced (16mA vs. 84mA), requiring load impedance verification.

Q: Is MAX9021AUK+T suitable for high-speed comparison applications? A: MAX9021AUK+T is not recommended for high-speed applications. Propagation delay (8µs) is substantially longer than LMV331M5 (600ns), making it unsuitable for circuits requiring fast response times. This part is optimized for precision low-power applications.

Q: What are the packaging implications of switching to TS391IQ2T? A: TS391IQ2T uses 8-DFN (2x2) packaging instead of SOT-23-5. This requires PCB layout redesign, including new footprint, trace routing, and thermal management considerations. Direct socket substitution is not possible.

Q: Does LMV331W5-7 require any circuit modifications? A: LMV331W5-7 uses SOT-25 packaging instead of SOT-23-5. Pin configuration differs, requiring PCB layout verification. Electrical parameters are compatible, but quiescent current is higher (200µA vs. 120µA). No circuit topology changes are necessary if load impedance is verified.

Q: Which substitute offers the lowest power consumption? A: MAX9021AUK+T provides the lowest quiescent current at 5µA, making it the most power-efficient option. This comes at the cost of significantly longer propagation delay (8µs), limiting its use to low-speed applications.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance consistent with the original LMV331M5. Moisture sensitivity levels vary (MSL 1 to MSL 3), which may affect storage and handling requirements.

Q: Can TS391RILT be used in circuits requiring the full 5.5V supply voltage? A: Yes. TS391RILT supports supply voltages up to 36V, encompassing the 5.5V requirement. However, input offset voltage specification is provided at 30V (5mV), not at 5V. For 5V operation, refer to the 5mV specification at 5V from TS391ILT variant for more accurate comparison.

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