1. DG201HSDY-T1-E3 Substitution Conclusion Based on fundamental functionality and package, the DG201HSDY-T1-E3 can serve as a direct pin-compatible replacement for the DG271BDY-E3. However, one critical power supply voltage difference and a secondary performance variation exist, making this a conditional substitution. The differences are as follows: First, the power supply scheme. The original DG271BDY-E3 is designed to operate only with a fixed ±15V dual supply. In contrast, the DG201HSDY-T1-E3 supports a wider range of either a single supply (13V to 36V) or a dual supply (±7V to ±22V). The substitute part offers greater flexibility in supply adaptation. However, if the original system design strictly relies on ±15V rails, it is necessary to verify that the new supply range remains compatible with other system components. Second, regarding dynamic performance: the substitute part features a slightly faster switching speed (Ton/Toff of 60ns/50ns versus 65ns/65ns) and lower off-capacitance (5pF versus 8pF). This can provide marginally better bandwidth and reduced loading effects in high-frequency signal paths. Additionally, the newly specified channel matching parameter (ΔRon of 1.5Ω) offers improved signal consistency in multi-channel applications. Provided the system's supply voltage is confirmed to meet the DG201HSDY-T1-E3 requirements, the substitution is viable and will yield slightly enhanced dynamic performance.