Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3
Alternative Part
1. AZ431AZ-ATRG1 Substitution Conclusion
Substitution is feasible, but attention must be paid to the difference in power dissipation. The AZ431AZ-ATRG1 outperforms the original part in key specifications: reference accuracy (±0.4% versus ±0.5% for the original) and temperature coefficient (20ppm/°C versus unspecified for the original). The slight deviation in reference voltage (2.5V compared to the original 2.495V) is acceptable in most applications. The primary difference lies in its cathode operating current of 1mA, which is higher than the original’s 700µA. Under identical operating conditions, this device will draw higher quiescent current, so its impact should be evaluated in circuits with stringent low‑power or high‑efficiency requirements. However, its TO‑92 package is fully compatible, making it a performance‑enhanced direct replacement for general‑purpose applications.
2. TL431CLPRPG Substitution Conclusion
Direct substitution is generally not recommended and should only be considered in applications where precision is not critical. Although the TL431CLPRPG matches the original part in reference voltage (2.495V) and package, its core accuracy specifications are significantly degraded: initial tolerance is ±2.2% (much worse than the original ±0.5%), and the typical temperature coefficient is 50ppm/°C (the original did not specify this parameter, but typically Grade B parts offer better performance). This results in greater initial error in the circuit’s voltage reference and more pronounced drift over temperature. Additionally, its cathode operating current of 1mA also contributes to increased power dissipation. Unless the application circuit is highly insensitive to voltage accuracy and temperature drift, substitution introduces considerable risk of system error.
Analysis ID: 8D9D-1A79000
Based on part parameters and for reference only. Not to be used for procurement or production.
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