FAN431AZXA Replacement: TL431ILPRPG, TL1431CLPRE3

Original Part

FAN431AZXA

onsemi

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

Alternative Part

TL431ILPRPG

onsemi

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

TL1431CLPRE3

Texas Instruments

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

1. TL431ILPRPG Substitution Conclusion The TL431ILPRPG can serve as a conditional substitute for the original part FAN431AZXA. Both devices share identical core parameters: an adjustable reference voltage of 2.495V, a maximum operating voltage of 36V, an output current of 100mA, package type, and cathode current specifications. They are also from the same product family and manufacturer (onsemi). The key difference lies in the tolerance, which is reduced from ±1% to ±2.2% for the TL431ILPRPG, effectively doubling its initial output voltage error range. This substitute can be used directly in general-purpose regulation or protection circuits where reference voltage precision is not critical, such as in non-precision switching power supply feedback loops. However, in applications demanding high initial accuracy—for example, precision measurement references—this tolerance difference may cause system error to exceed specifications, and circuit margin must be evaluated.

2. TL1431CLPRE3 Substitution Conclusion The TL1431CLPRE3 can be considered as a careful substitute for the original FAN431AZXA. There is a slight nominal difference in output voltage (2.5V vs. 2.495V), though in practice they are generally considered equivalent. Other key parameters, including adjustable range, current capability, and package, are compatible. A main advantage is its improved tolerance of ±0.4%, which offers better performance than the original part. However, its temperature coefficient (TC) is not explicitly specified, whereas the original part has a typical TC of 50ppm/°C. In applications with wide temperature ranges, the output voltage drift characteristic is uncertain and may affect the system's overall temperature drift performance. If the operating environment is temperature-stable or the application is not sensitive to temperature drift, substitution is feasible and benefits from the improved accuracy. If the operating temperature varies significantly and high stability is required, actual temperature drift performance should be validated through testing.

Analysis ID: 0C08-BF7C000

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