1. THS3112CDRG4 Substitution Conclusion The THS3112CDRG4 is a highly viable direct replacement for the LT1229CS8PBF, though key differences must be considered in the design. Both are current‑feedback dual op‑amps with compatible packages (8‑SOIC), identical maximum supply voltage (30V), and comparable input offset voltage (3mV). However, the THS3112 offers significantly enhanced dynamic performance: its slew rate (1550V/µs) is more than double that of the original part (700V/µs), enabling faster transient response; the –3dB bandwidth is slightly higher (110MHz vs. 100MHz); and the input bias current (330nA) is far lower than the original (10µA), reducing input‑stage errors. Additionally, its quiescent current per channel (4.9mA) is lower, contributing to power efficiency. Note that the THS3112 has a higher minimum supply voltage (10V) compared to the original part (4V); therefore, it is not compatible in systems using single‑supply low‑voltage rails (e.g., 5V). Moreover, its output current capability (270mA) is substantially improved, requiring careful stability design when driving capacitive loads. In summary, for applications where the supply voltage meets requirements and high‑speed performance is prioritized, the THS3112 represents a performance‑upgrade alternative.