TL431ILPE3 Replacement: LM431CCZ, KA431AZBU

Original Part

TL431ILPE3

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.2% 100 mA TO-92-3

Alternative Part

LM431CCZ

onsemi

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

KA431AZBU

onsemi

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

1. LM431CCZ Substitution Conclusion The LM431CCZ can directly replace the TL431ILPE3 and represents a comprehensive upgrade in key parameters. The differences lie in initial accuracy (±0.5% vs. ±2.2%) and a specified temperature coefficient (50ppm/°C vs. unspecified). In the vast majority of application circuits, the LM431CCZ provides a more precise and stable reference voltage. Particularly under varying operating temperatures, its output voltage exhibits smaller and more predictable drift. For designs originally using the TL431ILPE3, substituting with the LM431CCZ not only maintains full compatibility in pinout, operating voltage, and current capability but also enhances system performance.

2. KA431AZBU Substitution Conclusion The KA431AZBU can directly replace the TL431ILPE3, offering a moderate upgrade in core parameters. The primary differences are its improved initial accuracy (±1% vs. ±2.2%) and a specified temperature coefficient (50ppm/°C vs. unspecified). The KA431AZBU provides a more accurate reference voltage than the original part, with clearly guaranteed temperature stability, delivering performance that is superior or equal to the original. For applications not requiring the highest precision but benefiting from better performance or improved temperature characteristics compared to the original part, the KA431AZBU is a cost-effective alternative, offering full compatibility in package, electrical characteristics, and functionality.

Analysis ID: 39A1-96DE000

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