1. LMH6658MAX/NOPB Substitution Conclusion The feasibility assessment concludes that substitution is conditionally viable and requires application-specific evaluation. The core performance differences of the LMH6658 are as follows: its -3dB bandwidth (270 MHz) and slew rate (700 V/µs) are lower than those of the AD8058 (325 MHz, 1150 V/µs). This results in compromised absolute performance when processing very high-frequency signals or extremely fast transient pulses. However, its key advantages include rail-to-rail output and a high output current capability (110 mA). These features enable a wider dynamic output range and the ability to directly drive heavier loads (such as cables or ADCs), capabilities not explicitly specified for the AD8058. Furthermore, its input bias current (5 µA) is an order of magnitude higher than that of the AD8058 (500 nA). This will introduce greater input error current in applications with high source impedance, making it unsuitable for high-precision, high-impedance signal conditioning circuits. If the application does not demand maximum bandwidth and slew rate but requires stronger output drive and rail-to-rail swing, and can tolerate the moderately higher input bias current, then the LMH6658 represents a valid alternative.