Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA SOT-23-3
1. TL432BQDBZR Substitution Conclusion
The TL432BQDBZR can serve as a direct replacement for the AS431IANTR-G1, with two minor distinctions to note. Its reference voltage is 2.495V (compared to the original 2.5V). This 5mV deviation may introduce a slight shift in output voltage in applications requiring a precise 2.5V reference or employing fixed-value divider resistors; however, in most circuits where resistor trimming is permissible or the error is acceptable, the impact is negligible. Additionally, its typical cathode operating current is 80µA (versus 50µA for the original). This indicates that the TL432 may exhibit slightly different startup behavior, which should be verified in designs that are highly sensitive to low power consumption or startup current. For the vast majority of general-purpose voltage reference and feedback applications, this difference does not affect basic functionality, making it a suitable substitute.
2. KA431SAMF2TF Substitution Conclusion
The KA431SAMF2TF is subject to significant limitations as a replacement and should only be considered for non-critical applications. The key differences are as follows: First, its initial accuracy is ±1% (compared to ±0.5% for the original), resulting in greater output voltage dispersion, which makes it unsuitable for circuits demanding high reference precision. Second, its typical cathode operating current is as high as 1mA (versus 50µA for the original). After substitution, the quiescent power consumption of the reference source will increase noticeably, potentially affecting overall system efficiency and posing issues in low-power designs. Its advantage lies in providing a typical temperature coefficient parameter (50ppm/°C). This part may only be substituted in non-critical, tolerant designs where precision and power consumption are not sensitive factors; otherwise, it is not recommended.
Analysis ID: 7AD5-80F1000
Based on part parameters and for reference only. Not to be used for procurement or production.
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