TL431ILPE3 Replacement: TL431ACZ, TL431ACLPG

Original Part

TL431ILPE3

Texas Instruments

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

Alternative Part

TL431ACZ

STMicroelectronics

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

TL431ACLPG

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA TO-92 (TO-226)

1. TL431ACZ Substitution Conclusion The TL431ACZ can serve as a conditional substitute for the TL431ILPE3. It should be noted that its cathode current (600 µA) is significantly lower than that of the original part (1 mA), which may affect the stability of certain biasing circuit designs and requires re‑verification of reference voltage accuracy at low current levels. Additionally, its package is marked as TO‑92‑2 (though it remains a three‑pin device), but physical compatibility is generally consistent with TO‑92‑3. The advantage lies in its higher accuracy (±1% vs. ±2.2%); however, if the original circuit relies on higher cathode current for proper operation, direct substitution may lead to performance deviations.

2. TL431ACLPG Substitution Conclusion The TL431ACLPG is a highly viable direct replacement. Its key parameters—including cathode current (1 mA) and package (TO‑92‑3 long‑body)—are fully aligned with the original part, while accuracy is improved to ±1%. Furthermore, it explicitly provides a typical temperature coefficient (50 ppm/°C), which benefits applications with elevated temperature‑stability requirements. No significant differences exist in electrical or physical compatibility, making it a preferred option for designs seeking upgraded precision and temperature performance.

Analysis ID: 3F1B-040B000

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