TS391RIYLT Equivalent & Substitute Parts

Part Overview

The TS391RIYLT is a general-purpose CMOS comparator manufactured by STMicroelectronics in SOT-23-5 surface mount packaging. This single-element comparator operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), making it suitable for automotive and industrial applications. The device is qualified to AEC-Q100 automotive standards and carries Active product status with ROHS3 compliance.

Equivalent and substitute parts are identified when design requirements necessitate alternative packaging formats, different manufacturer sourcing, or specific operational parameter matching within the general-purpose comparator category. Substitution candidates maintain functional equivalence through matching electrical specifications and compatible mounting technologies.

Key Parameters

Parameter	Value	Specification Notes
Supply Voltage Range (Single/Dual)	2V ~ 36V / ±1V ~ 18V	Defines operational envelope
Input Offset Voltage (Max)	5mV @ 5V	DC accuracy specification
Input Bias Current (Max)	0.25µA @ 5V	Input impedance characteristic
Output Current (Typ)	16mA @ 5V	Drive capability
Quiescent Current (Max)	1.25mA	Power consumption at rest
Operating Temperature Range	-40°C ~ 125°C	Automotive grade specification
Output Type	CMOS, DTL, ECL, Open-Collector, TTL	Output configuration options
Package / Case	SC-74A, SOT-753	Physical form factor
Mounting Type	Surface Mount	PCB assembly method
Grade	Automotive	AEC-Q100 qualified

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the TS391RIYLT:

Parametric Equivalents maintain identical electrical specifications and package form factors, differing only in packaging format (Tape & Reel versus Cut Tape). These parts are direct functional replacements with no design modifications required.

Similar Parts share the same base product family or equivalent electrical performance within the general-purpose comparator category but may differ in one or more of the following parameters: supply voltage range, output current capability, quiescent current consumption, operating temperature range, package type, or output configuration. Selection of similar parts requires verification that the specific application tolerates these parameter variations.

Substitution eligibility is determined by matching the following critical parameters:

Supply voltage range compatibility
Input offset voltage specification
Input bias current specification
Output type configuration
Operating temperature range
Package mounting technology (Surface Mount)
RoHS and REACH compliance status

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Output Type	Product Status
TS391RIYLT	STMicroelectronics	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1.25mA	-40°C ~ 125°C	SOT-23-5	CMOS, DTL, ECL, Open-Collector, TTL	Active
TS391ILT	STMicroelectronics	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1.25mA	-40°C ~ 125°C	SOT-23-5	CMOS, DTL, ECL, Open-Collector, TTL	Active
TS391IYLT	STMicroelectronics	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1.25mA	-40°C ~ 125°C	SOT-23-5	CMOS, DTL, ECL, Open-Collector, TTL	Active
MIC6270YM5-TR	Microchip Technology	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	20mA @ 5V	1.2mA	-40°C ~ 85°C	SOT-23-5	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Active
TL331IDBVR	Texas Instruments	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	20mA	700µA	-40°C ~ 85°C	SOT-23-5	Open-Collector, Rail-to-Rail	Active
TA75S393F,LF	Toshiba Semiconductor and Storage	2V~36V / ±1V~18V	5mV @ 5V	0.05µA @ 5V	16mA @ 5V	800µA	-40°C ~ 85°C	SOT-23-5	CMOS, DTL, MOS, Open-Collector, TTL	Active
LM6511IM	Texas Instruments	2.5V~30V	5mV @ 2.7V	0.13µA @ 2.7V	—	3.5mA	-40°C ~ 85°C	8-SOIC	CMOS, Open-Collector, TTL	Last Time Buy
LMV331M7/NOPB	Texas Instruments	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	120µA	-40°C ~ 85°C	SC-70-5	CMOS, Open-Collector, TTL	Active
LMV331M7X/NOPB	Texas Instruments	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	120µA	-40°C ~ 85°C	SC-70-5	CMOS, Open-Collector, TTL	Active
LMV331SE-7	Diodes Incorporated	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	120µA	-40°C ~ 125°C	SOT-353	Open-Collector	Active
LMV331W5-7	Diodes Incorporated	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	200µA	-40°C ~ 125°C	SOT-25	Open-Collector	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Pin-Compatible Replacement)

The TS391ILT and TS391IYLT are direct functional equivalents of the TS391RIYLT. Both parts maintain identical electrical specifications and SOT-23-5 package compatibility. The TS391IYLT carries automotive AEC-Q100 qualification matching the main part. Selection between these options depends on packaging format availability: TS391ILT is supplied in Cut Tape & Digi-Reel format, while TS391RIYLT is supplied in Tape & Reel format. Both are Active status products with ROHS3 compliance.

Cross-Manufacturer Substitutes (Same Package, Verified Electrical Match)

The MIC6270YM5-TR (Microchip Technology) and TL331IDBVR (Texas Instruments) maintain the same SOT-23-5 package and supply voltage range as the TS391RIYLT. Both are Active status products. The MIC6270YM5-TR exhibits slightly higher output current (20mA versus 16mA) and lower quiescent current (1.2mA versus 1.25mA). The TL331IDBVR provides Rail-to-Rail output configuration with reduced quiescent current (700µA) but operates at a reduced upper temperature limit of 85°C versus 125°C.

The TA75S393F,LF (Toshiba) matches the TS391RIYLT supply voltage and package specifications with superior input bias current performance (0.05µA versus 0.25µA) and reduced quiescent current (800µA). Operating temperature is limited to 85°C.

Limited Supply Voltage Range Alternatives (Restricted to 2.7V–5.5V)

The LMV331 family (Texas Instruments and Diodes Incorporated variants) operates within a restricted supply voltage range of 2.7V to 5.5V, making these suitable only for applications not requiring the full 2V to 36V range of the TS391RIYLT. These parts offer significantly higher output current capability (84mA) and are available in multiple package options (SC-70-5, SOT-353, SOT-25). All LMV331 variants are Active status products.

Last Time Buy Status

The LM6511IM (Texas Instruments, 8-SOIC package) carries Last Time Buy product status and should not be selected for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can TS391ILT be used as a direct replacement for TS391RIYLT?

A: Yes. The TS391ILT is a parametric equivalent with identical electrical specifications and SOT-23-5 package compatibility. The only difference is packaging format: TS391ILT is supplied in Cut Tape & Digi-Reel format while TS391RIYLT is supplied in Tape & Reel format. Both are Active status products with ROHS3 compliance.

Q: What is the difference between TS391IYLT and TS391RIYLT?

A: Both parts are parametric equivalents with identical electrical specifications and SOT-23-5 packaging. The TS391IYLT carries automotive AEC-Q100 qualification, matching the main part. Selection depends on packaging format availability and supply chain requirements.

Q: Can MIC6270YM5-TR replace TS391RIYLT in automotive applications?

A: The MIC6270YM5-TR maintains the same supply voltage range, input offset voltage, and SOT-23-5 package as the TS391RIYLT. However, the MIC6270YM5-TR does not carry automotive AEC-Q100 qualification. Use is restricted to non-automotive applications or applications where automotive qualification is not required.

Q: Why do LMV331 parts have restricted supply voltage range?

A: The LMV331 family is optimized for low-voltage applications and operates within 2.7V to 5.5V supply range, compared to the TS391RIYLT range of 2V to 36V. LMV331 variants are suitable only for applications operating within this narrower voltage envelope.

Q: Is TL331IDBVR suitable for high-temperature automotive applications?

A: The TL331IDBVR operates to 85°C maximum, compared to the TS391RIYLT specification of 125°C. Applications requiring operation above 85°C require the TS391RIYLT or equivalent parts rated to 125°C.

Q: What is the significance of "Last Time Buy" status for LM6511IM?

A: Last Time Buy status indicates the manufacturer will no longer accept new orders after a specified date. This part should not be selected for new designs requiring long-term production support or future availability.

Q: Can I substitute a part with lower quiescent current?

A: Yes, if the application permits. The TA75S393F,LF (800µA) and TL331IDBVR (700µA) offer reduced quiescent current compared to TS391RIYLT (1.25mA). Verify that all other electrical parameters and operating conditions remain compatible with your design requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the TS391RIYLT environmental specification.

Q: What package options are available for general-purpose comparator substitutes?

A: The TS391RIYLT and most cross-manufacturer substitutes use SOT-23-5 surface mount packaging. Alternative packages include 8-SOIC (LM6511IM), SC-70-5 (LMV331M7/NOPB, LMV331M7X/NOPB), SOT-353 (LMV331SE-7), and SOT-25 (LMV331W5-7). Package selection depends on PCB layout constraints and assembly equipment compatibility.

Q: How do I verify compatibility before substitution?

A: Confirm that the substitute part meets all of the following criteria: (1) supply voltage range encompasses your application voltage, (2) input offset voltage and input bias current specifications are acceptable, (3) output current capability is sufficient for your load, (4) operating temperature range covers your application environment, (5) package type is compatible with your PCB assembly process, and (6) compliance certifications (ROHS, REACH, automotive qualification if required) match your requirements.

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