1. HA5023IBZ Substitution Conclusion Direct substitution of THS3112CD with HA5023IBZ is generally not feasible and should only be considered under very specific conditions. While both devices are dual current-feedback operational amplifiers and are pinout and package compatible, there is a significant performance gap between them. The THS3112CD features a much higher slew rate of 1550 V/µs and a stronger output current capability of 270 mA, making it well-suited for high-speed, large-signal swing applications and for driving heavy loads such as cables or ADCs. In contrast, the HA5023IBZ offers a slew rate of only 350 V/µs and a maximum output current of 20 mA, which are substantially lower. This directly translates to severely inadequate performance, or even potential failure, in applications requiring fast settling times or high output power. Substitution may only be considered if the application has very relaxed requirements for signal speed, swing, and load-driving capability; otherwise, it is not recommended.