先确认系统电压域
12V 系统与 48V 系统对耐压的要求不同，前者关注 Load Dump 余量，后者关注长期工作电压。
四个必须逐项核对的参数
- 耐压与瞬态余量
- 静态电流（常电系统尤其关键）
- 封装热阻与散热焊盘
- 保护策略（过流、过温、反接）
替换类型怎么判断
引脚一致且参数覆盖，可以按「引脚相同」直接评估；否则按「功能相同」重新做板级验证。
Selection Guide
Author：应用技术部
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