1. AP2171SG-13 Substitution Conclusion The AP2171SG-13 can serve as a functionally overlapping substitute, but with key performance trade-offs. The differences are as follows: First, in terms of switch type and output structure, the AP2171SG-13 is a P-channel switch designed specifically for USB applications, whereas the TPS2032DR is a general-purpose N-channel switch. The former is optimized for USB-specific scenarios such as hot-plugging (featuring its unique "reverse current protection" function). However, the P-channel architecture typically leads to the second key difference—a significantly higher on-resistance (95mΩ vs. 33mΩ). This results in a higher conduction voltage drop and increased heat generation under full-load conditions, impacting system efficiency and thermal design. If the application is sensitive to efficiency and power consumption and does not require USB-specific reverse current protection, this substitution will incur a performance penalty. Conversely, in USB power delivery scenarios that require enhanced reverse current blocking and operate at moderate load currents, the AP2171SG-13 is a pin-compatible and functionally more comprehensive viable alternative.