1. LM2904WDT Substitution Conclusion Direct substitution is not recommended and should only be cautiously evaluated for specific non-critical applications. The core difference between the LM2904WDT and the original TL062ACD lies in its standard bipolar input stage, as opposed to a JFET input stage. This results in an input bias current (20nA vs. 30pA) that is three orders of magnitude higher, making it unsuitable for high-impedance signal sources, precision integrators, or any application extremely sensitive to input current. Furthermore, its slew rate (0.6V/µs vs. 3.5V/µs) is significantly lower, leading to poorer capability in handling fast-changing signals and a reduced full-power bandwidth, which can cause large-signal response distortion. Its advantages include a lower minimum operating voltage (3V vs. 10V) and a higher output drive current, but these are typically not critical requirements for circuits designed around the TL062. Unless the application does not rely on the JFET's low input current characteristics at all and has no speed requirements, substitution will lead to severe performance degradation or functional failure.