TL431ILPE3 Replacement: TL1431IZ, TL431CZ

Original Part

TL431ILPE3

Texas Instruments

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

Alternative Part

TL1431IZ

STMicroelectronics

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

TL431CZ

STMicroelectronics

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3

1. TL1431IZ Substitution Conclusion The TL1431IZ can serve as a high‑precision upgrade substitute for the TL431ILPE3. However, it should be noted that its reference voltage is 2.5 V, slightly higher than the original 2.495 V, while its accuracy (±0.4%) is significantly better than the original (±2.2%). It also provides a well‑defined temperature coefficient of 100 ppm/°C, offering superior performance in applications with stringent temperature‑stability requirements. The device is marked with the TO‑226‑2 (TO‑226AC) package, which is physically compatible with TO‑92‑3; nevertheless, the pin‑out must be verified for exact correspondence. If the pin‑out matches, the TL1431IZ can be directly substituted to achieve a higher‑precision voltage reference.

2. TL431CZ Substitution Conclusion The TL431CZ is a direct replacement for the TL431ILPE3. Key parameters such as reference voltage (2.495 V), output voltage range (36 V), and output current (100 mA) are identical. Only a slight difference in accuracy exists (±2.21% vs. ±2.2%), resulting in a high degree of electrical compatibility. The TL431CZ can be directly substituted without circuit‑design modifications. However, subtle characteristic variations—such as noise or dynamic response—may arise due to the change in manufacturer. These variations typically do not affect functionality or reliability in general applications.

Analysis ID: B0DB-CEBD000

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