TL431ACLPR Replacement: AZ431AZ-ATRE1, AZ431BZ-ATRE1

Original Part

TL431ACLPR

Texas Instruments

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

Alternative Part

AZ431AZ-ATRE1

Diodes Incorporated

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

AZ431BZ-ATRE1

Diodes Incorporated

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.8% 100 mA TO-92

1. Substitution Conclusion for AZ431AZ-ATRE1 The AZ431AZ-ATRE1 can serve as a drop-in replacement for the TL431ACLPR, offering improvements in several key performance parameters. However, its higher minimum operating current requirement must be considered. The primary differences from the original part are as follows: First, the initial reference voltage accuracy is improved from ±1% to ±0.4%, resulting in a tighter absolute error band and contributing to enhanced overall system precision. Second, it specifies a typical temperature coefficient of 20ppm/°C, a parameter not explicitly defined for the original part. This provides a clear and superior guarantee of output voltage stability over temperature variations. Third, its typical cathode operating current (Iref) is 1mA, compared to 600µA for the original device. To ensure proper operation, the designed shunt resistor network must supply this higher current, which may lead to a marginal increase in quiescent power dissipation. Given its fully compatible package footprint, this substitution is viable and performance-enhancing, provided the circuit design can accommodate the slightly higher operating current.

2. Substitution Conclusion for AZ431BZ-ATRE1 The AZ431BZ-ATRE1 is a functionally compatible replacement for the TL431ACLPR, with generally comparable performance. Similar to the AZ431AZ variant, its higher minimum operating current must be noted. Key differences from the original part include: First, its initial accuracy of ±0.8% offers a marginal improvement over the original's ±1%. Second, it provides a defined typical temperature coefficient of 20ppm/°C, which is a clear advantage over the unspecified parameter of the original part. Third, its typical cathode operating current is 1mA, higher than the original's 600µA. This necessitates a re-evaluation of the current sourcing capability of the supply circuit. The package is fully pin-compatible. This substitution is functionally feasible, delivering similar or slightly improved voltage reference performance, but it requires acceptance of the increased operating current.

Analysis ID: BA65-D47F000

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