Original Part
Alternative Part
1. TPS2031DR Substitution Conclusion
Direct substitution is not recommended due to insufficient key parameters. Although the two devices are package-compatible and both feature a status flag, over-current, thermal, and undervoltage protection, the TPS2031DR has two primary disadvantages. First, its maximum output current is only 600mA, significantly lower than the AP2171SG-13's 1A rating. This presents an overload risk when driving the same load and limits its application range. Second, it lacks the reverse current protection feature of the original part. This is a critical safety deficiency in applications requiring prevention of current backflow from the output to the input, such as in hot-swap or battery-powered scenarios, and could lead to circuit damage or functional failure.
2. TPS2032DR Substitution Conclusion
It can serve as a functional replacement in most cases, but the core architectural differences must be noted and circuit validation is essential. The TPS2032DR matches or exceeds the original part in current capability (1A), on-resistance (33mΩ vs. 95mΩ, offering higher efficiency), and basic protection features. The most fundamental difference lies in the output type: the AP2171SG-13 uses a P-channel MOSFET, whereas the TPS2032DR employs an N-channel MOSFET. Although both are configured as high-side switches with identical interfaces, their internal gate drive circuit architectures are completely different (an N-channel high-side switch typically requires a charge pump to generate a gate voltage higher than the input). While pin-to-pin compatibility may exist, potential differences in enable logic levels, turn-on/turn-off timing, transient response, and sensitivity to input voltage ripple must be thoroughly tested in the actual application circuit to ensure system stability and reliability.
Analysis ID: 978A-B92F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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