LMV331QDBVRSV Equivalent & Substitute Parts

Part Overview

The LMV331QDBVRSV is a general-purpose comparator manufactured by Texas Instruments, designed for rail-to-rail operation in open-collector configuration. This device operates across a supply voltage range of 2.7V to 5.5V and is housed in a SOT-23-5 surface-mount package. The part is currently in active production status with 991 pieces available in new original inventory. Substitute parts are identified to address supply chain requirements, inventory availability, or specific application constraints while maintaining electrical and mechanical compatibility within defined parameter tolerances.

Substiute Parts

LMV331QDBVRSV

Texas InstrumentsIn Stock: 1010LMV331QDBVRSV Datasheet

Current PartRFQ

AZV331KTR-E1

Diodes IncorporatedIn Stock: 4639AZV331KTR-E1 Datasheet

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AZV331KTR-G1

Diodes IncorporatedIn Stock: 26254AZV331KTR-G1 Datasheet

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NCV391SN2T1G

onsemiIn Stock: 122489NCV391SN2T1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LMV331QDBVRSV is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Package type: SOT-23-5 surface-mount configuration
• Output type: Open-Collector topology
• Supply voltage range: Minimum 2.7V operation required
• Input offset voltage: Maximum 7mV @ 5V
• Input bias current: Maximum 0.25µA @ 5V
• Output current capability: Minimum 84mA @ 5V
• Quiescent current: Maximum 120µA
• Operating temperature range: Minimum -40°C to 125°C coverage
• RoHS3 compliance: Required for environmental standards

Substitute Parts Identified:

Group 1: Direct Electrical Equivalents (Diodes Incorporated)

• AZV331KTR-E1
• AZV331KTR-G1

Group 2: Extended Parameter Range (onsemi)

• NCV391SN2T1G

All identified substitutes maintain the SOT-23-5 package footprint and surface-mount configuration. Electrical parameters remain within specified tolerances for the primary application domain.

Parameter Comparison

Engineering Selection Recommendations

AZV331KTR-E1 and AZV331KTR-G1 (Diodes Incorporated):

These parts provide direct electrical equivalence to the LMV331QDBVRSV across the critical operating parameters: input offset voltage, input bias current, output current capability, and quiescent current. Both maintain SOT-23-5 packaging and open-collector output topology. The primary distinction between these two Diodes parts is moisture sensitivity level: AZV331KTR-E1 carries MSL 1 (Unlimited), while AZV331KTR-G1 carries MSL 3 (168 Hours), requiring controlled storage conditions.

A notable difference exists in operating temperature range: both Diodes parts are rated to -40°C to 85°C, compared to the LMV331QDBVRSV specification of -40°C to 125°C. This represents a 40°C reduction in maximum operating temperature. Applications requiring operation above 85°C must retain the original LMV331QDBVRSV or select the NCV391SN2T1G.

Propagation delay for both AZV331 variants is 450ns, which is faster than the LMV331QDBVRSV specification of 600ns (Typ). Both parts are ROHS3 compliant and carry active product status. Inventory availability is significantly higher for both Diodes parts (4600 and 26200 units respectively) compared to the original part (991 units).

NCV391SN2T1G (onsemi):

This part extends the operating temperature range to -40°C to 125°C, matching the original LMV331QDBVRSV specification. The supply voltage range is substantially broader: 2V to 36V single supply or ±1V to 18V dual supply, providing flexibility for diverse application environments.

Critical parameter differences must be noted: output current is specified at 16mA (Typ) @ 5V, significantly lower than the 84mA requirement of the LMV331QDBVRSV. Quiescent current is 1.25mA, approximately 10 times higher than the 120µA maximum of the original part. Propagation delay is 850ns (Typ), slower than both the original part and the Diodes alternatives.

The NCV391SN2T1G is suitable only for applications where reduced output current drive and higher quiescent current consumption are acceptable. The output type specification is not provided in the available data. Inventory availability is highest among all options at 122400 units. MSL rating is 1 (Unlimited), and ROHS3 compliance is confirmed.

Selection Logic:

• For direct replacement with identical electrical performance: Select AZV331KTR-E1 (MSL 1, unlimited moisture sensitivity) or AZV331KTR-G1 (MSL 3, controlled storage required). Verify application temperature requirements do not exceed 85°C.
• For applications requiring full temperature range (-40°C to 125°C): Retain LMV331QDBVRSV or select NCV391SN2T1G only if reduced output current (16mA vs. 84mA) and higher quiescent current (1.25mA vs. 120µA) are acceptable.
• For supply chain optimization with high inventory availability: AZV331KTR-G1 offers the largest stock position (26200 units) with equivalent electrical performance within the -40°C to 85°C range.

All substitute parts maintain ROHS3 compliance and active product status, confirming ongoing manufacturing support and environmental regulatory alignment.

Frequently Asked Questions (FAQ)

Q1: Can AZV331KTR-E1 or AZV331KTR-G1 be used as direct drop-in replacements for LMV331QDBVRSV?

A: Both AZV331 variants from Diodes Incorporated are electrically compatible with the LMV331QDBVRSV within the overlapping operating temperature range of -40°C to 85°C. Both maintain identical input offset voltage (7mV @ 5V), input bias current (0.25µA @ 5V), output current (84mA @ 5V), and quiescent current (120µA) specifications. Package footprint is identical (SOT-23-5). However, the maximum operating temperature is reduced from 125°C to 85°C. Applications operating above 85°C require the original part or alternative solutions.

Q2: What is the difference between AZV331KTR-E1 and AZV331KTR-G1?

A: The primary difference is moisture sensitivity level (MSL). AZV331KTR-E1 carries MSL 1 (Unlimited), requiring no special moisture control during storage or handling. AZV331KTR-G1 carries MSL 3 (168 Hours), requiring controlled storage conditions and bake-out procedures if moisture absorption limits are exceeded. Both parts are electrically identical. Selection depends on supply chain logistics and storage capability.

Q3: Why does NCV391SN2T1G show lower output current (16mA vs. 84mA)?

A: The NCV391SN2T1G is a different comparator design from onsemi with different output stage architecture. While it maintains the same input bias current and offset voltage specifications, the output drive capability is substantially reduced. This part is not suitable for applications requiring 84mA output current. Selection of NCV391SN2T1G is appropriate only when output current requirements are 16mA or less.

Q4: Can NCV391SN2T1G be used in applications requiring the full -40°C to 125°C temperature range?

A: Yes, NCV391SN2T1G is rated for -40°C to 125°C operation, matching the original LMV331QDBVRSV specification. However, the reduced output current (16mA vs. 84mA) and significantly higher quiescent current (1.25mA vs. 120µA) must be evaluated against application requirements. The broader supply voltage range (2V to 36V) provides additional flexibility for diverse circuit topologies.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts (AZV331KTR-E1, AZV331KTR-G1, and NCV391SN2T1G) are ROHS3 compliant, confirming environmental regulatory alignment with the original LMV331QDBVRSV.

Q6: What is the propagation delay difference, and does it affect circuit performance?

A: The LMV331QDBVRSV specifies 600ns (Typ) propagation delay. AZV331KTR-E1 and AZV331KTR-G1 specify 450ns, representing a 25% improvement in switching speed. NCV391SN2T1G specifies 850ns (Typ), representing a 42% increase in delay. Applications with timing-critical requirements must evaluate whether these differences impact system performance. Faster propagation delay (AZV331 variants) may improve response time; slower delay (NCV391SN2T1G) may require circuit timing adjustments.

Q7: What inventory considerations apply to these substitutes?

A: The original LMV331QDBVRSV has 991 units in stock. AZV331KTR-E1 has 4600 units, AZV331KTR-G1 has 26200 units, and NCV391SN2T1G has 122400 units. For supply chain continuity and lead-time reduction, the Diodes and onsemi alternatives offer significantly higher inventory availability.

Q8: Are there any package or footprint differences between these parts?

A: All parts use SOT-23-5 surface-mount packaging with identical footprints (SC-74A, SOT-753 case designation). PCB layout and reflow soldering processes require no modification. NCV391SN2T1G is designated as 5-TSOP (Thin Small Outline Package), which is mechanically compatible with SOT-23-5 footprints but may have slightly different height specifications. Verify PCB clearance requirements for height-sensitive applications.

Q9: Which substitute part should be selected for new design implementations?

A: For new designs requiring the full -40°C to 125°C temperature range with 84mA output current, retain the LMV331QDBVRSV. For designs operating within -40°C to 85°C with standard moisture handling, AZV331KTR-G1 offers the best supply chain position (26200 units) with identical electrical performance. For applications with reduced output current requirements and extended supply voltage flexibility, NCV391SN2T1G provides an alternative with full temperature range coverage.

Q10: What compliance certifications are provided for these parts?

A: All parts carry ROHS3 compliance certification. AZV331KTR-E1 and AZV331KTR-G1 include REACH Unaffected status and ECCN EAR99 classification. NCV391SN2T1G also includes REACH Unaffected status and ECCN EAR99 classification, with HTSUS code 8542.39.0001. These certifications confirm regulatory compliance for commercial and industrial applications.