TL331SDBVRWB Equivalent & Substitute Parts

Part Overview

The TL331SDBVRWB is a general-purpose comparator manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in SOT-23-5 surface mount packaging. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), making it suitable for diverse analog signal comparison applications. The part is currently in active production status with 972 units available in new original inventory. Substitute parts are identified to address supply chain requirements, inventory availability, or equivalent functional performance in system designs.

Substiute Parts

TL331SDBVRWB

Texas InstrumentsIn Stock: 990TL331SDBVRWB Datasheet

Current PartRFQ

TS391ILT

STMicroelectronicsIn Stock: 145525TS391ILT Datasheet

SimilarRFQ

TS391RILT

STMicroelectronicsIn Stock: 17129TS391RILT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TL331SDBVRWB are qualified based on the following electrical and mechanical compatibility criteria:

Critical Matching Parameters:

• Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
• Input offset voltage: 5mV maximum at 5V
• Output type: Open-collector configuration with rail-to-rail capability
• Package: SC-74A / SOT-753 (SOT-23-5 supplier package)
• Mounting: Surface mount
• Single comparator element (1 channel)
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

The identified substitutes (TS391ILT and TS391RILT from STMicroelectronics) meet all critical electrical parameters within the specified operating conditions. Both parts maintain identical supply voltage ranges, input offset specifications, and package form factors. Output type compatibility is confirmed through open-collector functionality. All substitutes are active production parts with RoHS3 compliance and MSL-1 rating.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

All three parts (TL331SDBVRWB, TS391ILT, and TS391RILT) are active production devices with ROHS3 compliance and MSL-1 rating, confirming environmental and regulatory equivalence for industrial and commercial applications.

Electrical Performance Considerations:

The TL331SDBVRWB exhibits lower input bias current (0.025µA @ 5V) compared to the STMicroelectronics substitutes (0.25µA @ 5V), representing a 10-fold difference. This parameter difference is significant in high-impedance signal conditioning applications where input bias current drift affects measurement accuracy. The TL331SDBVRWB also provides higher typical output current (20mA versus 16mA), beneficial for driving lower-impedance loads directly.

Quiescent current consumption differs substantially: TL331SDBVRWB draws 700µA maximum, while both TS391 variants draw 1.25mA maximum. This 1.79-fold increase in quiescent current is relevant for battery-powered or low-power applications.

Supply Voltage and Input Offset Equivalence:

All three parts support identical supply voltage ranges (2V ~ 36V single, ±1V ~ 18V dual) and maintain 5mV maximum input offset voltage specification, confirming functional equivalence across the specified operating envelope.

Package and Mounting Compatibility:

All parts use SC-74A / SOT-753 packaging in SOT-23-5 supplier configuration, ensuring direct PCB footprint compatibility and surface mount assembly interchangeability.

Inventory and Availability:

TS391ILT provides significantly higher inventory availability (145,424 units) compared to TL331SDBVRWB (972 units), while TS391RILT offers intermediate availability (17,108 units). Selection should consider supply chain requirements and lead time constraints.

Frequently Asked Questions (FAQ)

Q1: Can TS391ILT and TS391RILT be used interchangeably with TL331SDBVRWB in all applications?

A: Electrical substitution is valid where input bias current and quiescent current specifications do not impose design constraints. Applications requiring ultra-low input bias current (below 0.1µA) or minimal quiescent current consumption should retain the TL331SDBVRWB. For general-purpose comparator applications within the specified voltage ranges, both TS391 variants provide functional equivalence.

Q2: What is the difference between TS391ILT and TS391RILT?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is input offset voltage measurement condition: TS391ILT is specified at 5V, while TS391RILT is specified at 30V. Both maintain 5mV maximum offset across their operating ranges. Selection between these variants depends on supply voltage operating point and inventory availability.

Q3: Are the package dimensions identical across all three parts?

A: Yes. All three parts use SC-74A / SOT-753 physical packaging with SOT-23-5 supplier designation, confirming identical footprint, pin pitch, and height specifications for direct PCB substitution.

Q4: Do all parts meet the same environmental and compliance standards?

A: Yes. TL331SDBVRWB, TS391ILT, and TS391RILT are all ROHS3 compliant with MSL-1 (Unlimited) moisture sensitivity rating, confirming equivalent environmental qualification and storage requirements.

Q5: Which part should be selected for battery-powered applications?

A: The TL331SDBVRWB is preferred for battery-powered designs due to lower quiescent current consumption (700µA maximum versus 1.25mA for TS391 variants). This 1.79-fold reduction in standby current directly extends battery life in low-duty-cycle applications.

Q6: Are there output type differences that affect circuit design?

A: The TL331SDBVRWB specifies open-collector, rail-to-rail output. The TS391 variants list multiple output types (CMOS, DTL, ECL, open-collector, TTL for TS391ILT; CMOS, DTL, ECL, MOS, TTL for TS391RILT). All three parts support open-collector operation, confirming output stage compatibility. External pull-up resistor requirements remain identical across all variants.

Q7: What is the impact of input bias current difference on circuit performance?

A: The 10-fold input bias current difference (0.025µA versus 0.25µA) becomes significant in high-impedance input circuits (>1MΩ) where bias current generates offset voltage across the source impedance. For standard comparator applications with source impedances below 100kΩ, this difference produces negligible offset voltage contribution.