LM431CCZ Replacement: TL431ILP, LM431CCZ/NOPB

Original Part

LM431CCZ

onsemi

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

Alternative Part

TL431ILP

Texas Instruments

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

LM431CCZ/NOPB

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.5V 37 VV -0.6%, +0.4% 100 mA TO-92-3

1. TL431ILP Substitution Conclusion This device can be considered a substitute only in non-precision, cost-sensitive applications, with careful re-evaluation of system accuracy and temperature drift requirements. The TL431ILP is compatible with the original part in its fundamental architecture (adjustable shunt reference, 2.495V reference, 100mA output current, TO-92 package). However, its key differences lie in a significantly lower initial accuracy (±2.2% vs. ±0.5%) and an unspecified temperature coefficient. After substitution, the actual reference voltage of the circuit may deviate further from the nominal value, and its stability over the full operating temperature range may degrade. It is therefore unsuitable for applications demanding high voltage accuracy and temperature stability, such as precision measurement or high-stability power supply feedback loops.

2. LM431CCZ/NOPB Substitution Conclusion This part can serve as a high-performance direct replacement, though attention should be paid to its asymmetric tolerance and slightly higher nominal voltage. This part is highly consistent with the original in electrical characteristics (adjustable, 100mA output, 50ppm/°C typical temperature drift) and package. The differences are a slightly higher nominal reference voltage (2.5V vs. 2.495V) and a higher maximum operating voltage (37V vs. 36V). Its initial accuracy is specified as -0.6%/+0.4% (asymmetric). The higher voltage rating provides greater design margin, while the minor nominal voltage difference (0.005V) is negligible for the vast majority of applications. The asymmetric tolerance generally provides precision control comparable to, or slightly better than, the original's ±0.5%. This part represents an equivalent or superior direct replacement in terms of performance and reliability.

Analysis ID: 398F-1222000

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