Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2% 100 mA TO-236AB
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA SOT-23-3
1. TL431QDBZR Substitution Conclusion
From the perspective of core functionality and package, the TL431QDBZR can serve as a substitute for the original part. Both are adjustable shunt references in the SOT-23-3 package, with key parameters such as output voltage range (2.495V-36V) and output current (100mA) being identical. The primary difference lies in the initial accuracy: ±2.2% for the TL431QDBZR, which is slightly wider than the ±2% of the original part. In the worst-case scenario, this results in an initial output voltage error range approximately 0.5mV wider (calculated based on 2.495V). For most general-purpose applications where the absolute accuracy of the reference voltage is not critical—such as power supply feedback or over-voltage protection—this deviation is generally acceptable. However, if the application has stringent requirements on initial accuracy (e.g., where ±2% represents the design margin limit), a careful evaluation is necessary.
2. TL431BCDBZR Substitution Conclusion
The TL431BCDBZR is a direct and superior performance replacement for the original part. While both share the same package and fundamental electrical specifications (output voltage range, output current), there are two key technical distinctions. First, the initial accuracy is significantly improved to ±0.5%, far surpassing the original part's ±2%. This yields a more precise reference voltage with lower variation, which enhances overall circuit performance consistency. Second, the typical cathode operating current is reduced to 600µA, compared to 1mA for the original part. For equivalent functionality, the TL431BCDBZR exhibits lower self-power consumption, contributing to reduced system standby power and improved thermal performance. Unless the original circuit design critically depends on the 1mA cathode current for biasing or setting specific conditions, the TL431BCDBZR represents a superior alternative offering advantages in both precision and energy efficiency.
Analysis ID: 2E59-EAB9000
Based on part parameters and for reference only. Not to be used for procurement or production.
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