1. TS514IDT Substitution Conclusion Direct substitution is not viable and is only acceptable for non-critical applications where input impedance and drive capability are not required. The TS514IDT, being a general-purpose standard operational amplifier, is fundamentally different from the J-FET input TLE2064MDG4. Its input bias current (50 nA) is four orders of magnitude higher than that of the original part (4 pA). In circuits requiring extremely low input current, such as those involving high-impedance sensors, integrators, or sample-and-hold stages, the TS514IDT would introduce significant error or even fail to function. Furthermore, its output drive capability (23 mA) is substantially lower than the original's (80 mA), rendering it incapable of driving the same load. While its gain-bandwidth product (3 MHz) is slightly higher and its quiescent current is lower, these advantages cannot compensate for its critical shortcomings in core parameters.