Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2% 100 mA TO-236AB
Alternative Part
1. TL431QDBZT Substitution Conclusion
The TL431QDBZT can serve as a replacement for the original TL431IDBZR,215, though several differences should be noted. The TL431QDBZT has a tolerance of ±2.2%, slightly wider than the original’s ±2%. In voltage reference applications, this may result in marginally lower output voltage accuracy and could lead to slightly larger system voltage deviations. Other key parameters—such as cathode current (1 mA), package (SOT-23-3), and output voltage range (2.495V to 36V)—remain identical to the original. Therefore, if the application does not demand tight precision—for instance, in power supplies or control circuits that can tolerate ±2.2% error—the TL431QDBZT can be directly substituted without circuit modification. However, the impact on accuracy should be validated in the design to ensure system stability.
2. TL431ASA-7 Substitution Conclusion
The TL431ASA-7 can replace the original TL431IDBZR,215, but circuit compatibility must be evaluated. Key differences include: a tolerance of ±1%, which is tighter than the original’s ±2%, offering improved voltage reference accuracy and contributing to better output voltage stability and system reliability. The cathode current is 700 µA, lower than the original’s 1 mA. This reduces chip power dissipation, which benefits energy‑efficient designs, but may affect startup or operation under low‑current conditions. It is essential to ensure that the bias resistors or load current can meet the minimum operating current requirement of the device to avoid potential failure. The package is the same (SOT-23-3), so pin compatibility is maintained. Nevertheless, the circuit should be tested after substitution to verify that the difference in cathode current does not degrade performance.
Analysis ID: 3599-E02D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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