TS431BIYLT Replacement: TLV431ACDBVR, TLV431IDBVR

Original Part

TS431BIYLT

STMicroelectronics

Shunt Voltage Reference IC Adjustable 1.24V 6 VV ±0.5% 30 mA SOT-23-5

Alternative Part

TLV431ACDBVR

Texas Instruments

Shunt Voltage Reference IC Adjustable 1.24V 6 VV ±1% 15 mA SOT-23-5

TLV431IDBVR

Texas Instruments

Shunt Voltage Reference IC Adjustable 1.24V 6 VV ±1.5% 15 mA SOT-23-5

1. TLV431ACDBVR Substitution Conclusion Substitution should be approached with caution and is only suitable for non-critical or cost-sensitive non-automotive applications. Compared to the original part, TS431BIYLT, the primary differences are as follows: Its accuracy (±1% vs. ±0.5%) is reduced by a factor of two, resulting in a larger initial output voltage tolerance. The output current (15mA vs. 30mA) is halved, limiting its shunt load or drive capability. The absence of a defined temperature coefficient and AEC-Q100 automotive-grade qualification indicates potentially inferior stability over wide temperature ranges compared to the original part, making it unsuitable for applications with stringent reliability requirements, such as automotive electronics. The cathode current (80µA vs. 60µA) is slightly higher, contributing to a minor increase in system quiescent current. In non-automotive circuits where requirements for accuracy, drive current, and temperature stability can be relaxed, it may serve as a low-cost alternative, but system performance must be re-evaluated.

2. TLV431IDBVR Substitution Conclusion Direct substitution is not recommended and should only be considered for consumer or low-cost applications with very lenient performance requirements. Beyond the shared issues with the ACDBVR variant—such as reduced output current, lack of automotive qualification, and missing temperature coefficient—this part exhibits further degradation in accuracy (±1.5% vs. ±0.5%). This threefold reduction significantly worsens the initial precision of the reference voltage. In circuits reliant on precise voltage thresholds (e.g., precision regulation, voltage monitoring), system consistency, stability, and accuracy will be compromised. This variant should only be considered for replacement in applications that are highly insensitive to voltage accuracy, non-automotive, and have minimal load current demands. Thorough testing is mandatory to verify whether the resulting system performance degradation is acceptable.

Analysis ID: DC3C-8098000

Based on part parameters and for reference only. Not to be used for procurement or production.