TL1431IZ Replacement: TL431ACLPE3, TL431BCLPE3

Original Part

TL1431IZ

STMicroelectronics

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA TO-92-3

Alternative Part

TL431ACLPE3

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA TO-92-3

TL431BCLPE3

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3

1. TL431ACLPE3 Substitution Conclusion Feasible, but performance degradation requires careful assessment. The TL431ACLPE3 matches the original TL1431IZ in key electrical parameters (output voltage range 2.495V–36V, output current 100mA) and package (TO-92, 3-pin compatible), meeting the physical and basic electrical conditions for direct substitution. The main differences lie in a significantly lower reference accuracy (±1% vs. ±0.4%) and an unspecified temperature coefficient (typically worse than 100ppm/°C). After substitution, both the initial accuracy and temperature stability of the circuit’s reference voltage will degrade, which may render it unsuitable for applications demanding high voltage precision and temperature stability, such as precision measurement or wide-temperature-range operation. If the target circuit has relaxed absolute accuracy requirements (e.g., general voltage monitoring), substitution is acceptable.

2. TL431BCLPE3 Substitution Conclusion Highly feasible and a superior alternative. The TL431BCLPE3 also maintains electrical characteristics and package compatibility with the original part. Its key difference is a slightly lower reference accuracy (±0.5% vs. ±0.4%), though the deviation is minor and acceptable in most practical applications. However, its unspecified temperature coefficient remains a potential performance limitation. In room-temperature or temperature-insensitive applications, the TL431BCLPE3 can nearly match the performance of the original part. For high-precision scenarios, it is slightly inferior but represents a significant improvement over the A-grade version. Overall, it is a balanced and reliable substitute for the TL1431IZ, with the only remaining consideration being whether its uncharacterized temperature drift meets the specific application’s operating temperature range requirements.

Analysis ID: FE27-1ABE000

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