1. AD744JRZ-REEL Substitution Conclusion Direct substitution is generally not feasible and requires rigorous evaluation. While both the AD744 and TLE2081 are JFET-input operational amplifiers, they exhibit significant differences in key parameters. The AD744's supply voltage range (9 V to 36 V) is narrower than that of the TLE2081 (4.5 V to 38 V). Crucially, its minimum supply voltage is twice as high, which completely precludes its use in single-supply +5V or lower voltage systems. Its output current capability (~25 mA) is approximately half that of the TLE2081 (~48 mA), resulting in a substantially reduced ability to drive capacitive or low-impedance loads. Furthermore, its quiescent current (3.5 mA) is more than double that of the TLE2081 (1.7 mA), making it unsuitable for power-sensitive applications. Although the AD744 offers advantages in bandwidth (13 MHz) and slew rate (75 V/µs), its higher input bias current (30 pA) slightly compromises the ultra-high input impedance characteristic typical of JFET amplifiers. Substitution may only be considered in applications where higher speed is paramount, supply voltage is sufficiently high, and both drive capability and power consumption are not critical concerns.