AZV331KSTR-E1 Equivalent & Substitute Parts

Part Overview

The AZV331KSTR-E1 is a general-purpose comparator IC manufactured by Diodes Incorporated in SC-70-5 surface mount packaging. This single-element open-collector comparator operates across a 2.5V to 5.5V supply voltage range with a maximum input offset voltage of 7mV at 5V and a propagation delay of 450ns. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AZV331KSTR-E1
Manufacturer	Diodes Incorporated
Product Status	Obsolete
Type	General Purpose Comparator
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2.5V ~ 5.5V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	84mA @ 5V
Current - Quiescent (Max)	120µA
Propagation Delay (Max)	450ns
Operating Temperature	-40°C ~ 85°C
Package / Case	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the AZV331KSTR-E1 is determined by the following critical parameters:

Output Type: Open-Collector configuration
Voltage Supply Range: Minimum 2.5V to 5.5V compatibility
Input Offset Voltage: Maximum 7mV at 5V
Current Output: Typical 84mA at 5V
Quiescent Current: Maximum 120µA
Propagation Delay: Maximum 450ns
Package Compatibility: SC-70-5, SOT-353, or equivalent 5-pin surface mount packages
Operating Temperature Range: -40°C to 85°C minimum
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Direct Diodes Incorporated Replacement (Active Status)

LMV331SE-7: Active product with identical electrical performance and compatible packaging

Category 2: Cross-Manufacturer Alternatives (Active Status)

Texas Instruments LMV331QDBVRQ1: Automotive-qualified alternative with extended temperature range
Analog Devices LT1011 series: Extended supply voltage range alternatives available in multiple packages
onsemi NCV391SN2T1G: Wide supply voltage range alternative with active production status

Parameter Comparison

Parameter	AZV331KSTR-E1	LMV331SE-7	LMV331QDBVRQ1	LT1011ACN8#PBF	LT1011AIS8#TRPBF	NCV391SN2T1G
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Analog Devices	Analog Devices	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active
Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Output Type	Open-Collector	Open-Collector	Open-Collector	Open-Collector	Open-Collector	Not Specified
Voltage - Supply (V)	2.5 ~ 5.5	2.7 ~ 5.5	2.7 ~ 5.5	3 ~ 36, ±1.5 ~ 18	3 ~ 36, ±1.5 ~ 18	2 ~ 36, ±1 ~ 18
Input Offset (Max, mV)	7 @ 5V	7 @ 5V	7 @ 5V	0.75 @ ±15V	0.75 @ ±15V	5
Input Bias (Max, µA)	0.25 @ 5V	0.25 @ 5V	0.025 @ 5V	0.035 @ ±15V	0.035 @ ±15V	0.25 @ 5V
Output Current (Typ, mA)	84 @ 5V	84 @ 5V	84 @ 5V	50	50	16 @ 5V
Quiescent Current (Max, µA)	120	120	150	4000	4000	1250
Propagation Delay (Max, ns)	450	450	600	Not Specified	Not Specified	850 (Typ)
Operating Temperature (°C)	-40 ~ 85	-40 ~ 125	-40 ~ 125	0 ~ 70	-40 ~ 85	-40 ~ 125
Package / Case	5-TSSOP, SC-70-5	5-TSSOP, SOT-353	SC-74A, SOT-753	8-DIP	8-SOIC	SOT-23-5, TSOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: LMV331SE-7

The LMV331SE-7 from Diodes Incorporated is the direct active replacement for the obsolete AZV331KSTR-E1. It maintains identical electrical specifications, output type, and supply voltage range while offering active production status. The package footprint is compatible (SOT-353), and both parts share the same base product number (LMV331). This part requires no design modifications and provides the lowest risk substitution path.

Secondary Recommendation: LMV331QDBVRQ1 (Texas Instruments)

The LMV331QDBVRQ1 provides an active alternative with automotive-grade qualification (AEC-Q100) and extended operating temperature range (-40°C to 125°C). It maintains the same electrical performance within the 2.7V to 5.5V supply range and open-collector output configuration. The SOT-23-5 package is mechanically compatible with the original SC-70-5 footprint. This option is suitable for applications requiring automotive qualification or extended temperature operation.

Tertiary Recommendations: Analog Devices LT1011 Series

The LT1011 series (LT1011ACN8#PBF, LT1011AIS8#TRPBF, LT1011CN8#PBF, LT1011CS8#TRPBF, LT1011IS8#TRPBF) offers extended supply voltage capability (3V to 36V or ±1.5V to 18V) with superior input offset voltage performance (0.75mV to 2mV). These parts are suitable for applications requiring wider supply voltage ranges or higher precision. Package options include 8-DIP (through-hole) and 8-SOIC (surface mount), requiring PCB layout modifications. Quiescent current is significantly higher (4mA), which may impact low-power applications.

Alternative: onsemi NCV391SN2T1G

The NCV391SN2T1G provides the widest supply voltage range (2V to 36V or ±1V to 18V) with active production status and unlimited MSL rating. The SOT-23-5 package is mechanically compatible. However, propagation delay is longer (850ns typical) and output current is lower (16mA at 5V), making this option suitable only for applications where these trade-offs are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the LMV331SE-7 be used as a direct drop-in replacement for the AZV331KSTR-E1?

A: Yes. The LMV331SE-7 maintains identical electrical specifications, output type, supply voltage range, and package footprint. No design modifications are required.

Q: What is the key difference between the LMV331SE-7 and LMV331QDBVRQ1?

A: The LMV331QDBVRQ1 includes automotive-grade qualification (AEC-Q100), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and improved moisture sensitivity level (MSL 1 versus MSL 3). The LMV331SE-7 is the standard industrial-grade equivalent.

Q: Why do the Analog Devices LT1011 parts have higher quiescent current?

A: The LT1011 series is designed for extended supply voltage operation (up to ±18V) and offers superior input offset voltage performance. The higher quiescent current (4mA) is a design trade-off for this extended capability. These parts are not recommended for battery-powered or low-power applications where the AZV331KSTR-E1 or LMV331SE-7 would be more suitable.

Q: Are the package dimensions identical between SC-70-5 and SOT-353?

A: SC-70-5 and SOT-353 are equivalent designations for the same 5-pin thin small-outline package. The footprints are identical and interchangeable.

Q: Can the onsemi NCV391SN2T1G be used in place of the AZV331KSTR-E1?

A: The NCV391SN2T1G is mechanically compatible (SOT-23-5 package) and covers the required supply voltage range. However, the propagation delay is longer (850ns typical versus 450ns maximum) and output current is lower (16mA at 5V versus 84mA typical). Substitution is only appropriate if the application can tolerate these performance differences.

Q: What does "open-collector output" mean for comparator selection?

A: Open-collector output means the comparator output is a transistor that can only pull the output low or leave it floating. An external pull-up resistor to the supply voltage is required. All recommended substitutes maintain this output configuration, ensuring circuit compatibility.

Q: Is RoHS compliance maintained across all substitute parts?

A: Yes. All recommended substitute parts are ROHS3 compliant, matching the compliance status of the original AZV331KSTR-E1.

Q: Which substitute part has the best input offset voltage performance?

A: The Analog Devices LT1011 series offers the best input offset voltage performance at 0.75mV to 2mV at ±15V. However, this comes with trade-offs in quiescent current and package size. For applications operating at 5V with the original 7mV specification, the LMV331SE-7 or LMV331QDBVRQ1 are more appropriate.

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