Original Part
Alternative Part
1. AP2171DSG-13 Substitution Conclusion
The AP2171DSG-13 can serve as a replacement for the AP2161SG-13, provided a critical logic-level difference is addressed. The two devices are fully aligned in their core electrical specifications (e.g., load voltage range of 2.7V to 5.5V, maximum output current of 1A, typical on-resistance of 95mΩ), protection features (fixed current limit, thermal shutdown, reverse current blocking, UVLO), status flag functionality, and package (8-SOIC). The sole difference lies in the input logic type: the original AP2161SG-13 features an inverting input, whereas the AP2171DSG-13 has a non-inverting input. When driven by an identical digital control signal (e.g., on the EN pin), the switch states of the two devices will be opposite. For instance, applying a logic-high signal turns the switch OFF on the AP2161SG-13 but turns it ON on the AP2171DSG-13. Therefore, in a direct substitution, the polarity of the output control signal from the microcontroller or logic circuit must be inverted; otherwise, system functionality will be compromised.
2. AP2171AS-13 Substitution Conclusion
The substitution case for the AP2171AS-13 is identical to that of the AP2171DSG-13; it can replace the AP2161SG-13, subject to the same logic polarity conversion requirement. Based on the provided parameters, the AP2171AS-13 matches the AP2171DSG-13 in all key aspects, including input type (non-inverting), electrical parameters, protection features, and package. Consequently, its sole and critical point of divergence from the original AP2161SG-13 is also the input logic polarity. When substituting the AP2161SG-13 with the AP2171AS-13, the preceding control signal logic must be inverted—just as when using the AP2171DSG-13—to ensure the switch's ON/OFF state aligns with the intended system design.
Analysis ID: D185-8DD5000
Based on part parameters and for reference only. Not to be used for procurement or production.
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