1. THS3112CDDA Substitution Conclusion The THS3112CDDA is a viable substitute in terms of electrical performance and functionality. The key differences are as follows: the -3dB bandwidth of the THS3112CDDA (110 MHz) is slightly lower than that of the original part (125 MHz), which may lead to a minor performance degradation at very high frequencies. However, its slew rate (1550 V/µs) far exceeds that of the original part (350 V/µs), giving it a strong capability to handle fast transient signals, such as video edges. Additionally, its output current (270 mA) is significantly higher than the original part's 20 mA, enabling it to drive heavier (lower impedance) loads directly. A critical limitation is the supply voltage: the absolute maximum supply range for the THS3112CDDA (±15V) is narrower than that of the original part (±18V). Direct substitution is not possible if the original design operates near ±18V. Furthermore, its package (PowerSOIC with a thermal pad) has different PCB thermal design requirements compared to the original 8-SOIC package, necessitating a re-evaluation of the board layout.