Original Part
Alternative Part
1. AD746JRZ Substitution Conclusion
The AD746JRZ, a J-FET dual op-amp, is pin-compatible and functionally equivalent to the TLE2082ACDRG4 in an 8-SOIC package. However, key electrical parameters differ significantly. It offers higher slew rate (75 V/µs) and gain bandwidth product (13 MHz), which benefit high-speed signal processing. On the other hand, its input bias current (110 pA) is approximately 5.5 times that of the original part, potentially introducing greater error in high-impedance sensor applications. The supply voltage range (9 V to 36 V) is narrower, with a minimum voltage higher than the original part's 4.5 V, limiting suitability in low-voltage systems. Furthermore, its output current (25 mA) is only half of the original part's, reducing drive capability. Substitution should be carefully evaluated if the application is sensitive to lower supply voltage, output drive strength, or input bias current, such as in precision low-power acquisition circuits. Otherwise, it can be used as a compatible replacement in general medium-to-high-speed signal conditioning circuits.
2. LT1355CS8TRPBF Substitution Conclusion
The LT1355CS8TRPBF is a voltage-feedback op-amp. While it shares the same package and some parameters (e.g., 12 MHz gain bandwidth product) are similar, a fundamental architecture difference results in an input bias current (80 nA) that is 4000 times higher than the original part (20 pA). This makes it completely unsuitable for high-impedance or low-current sensing applications. Its extremely high slew rate (400 V/µs) makes it better suited for circuits requiring fast transient response. The supply current is lower (1 mA per channel), which helps reduce system power consumption. The supply voltage range (5 V to 30 V) is slightly narrower but still covers most common applications. This device can only substitute the original in general-purpose amplification circuits where input impedance is not critical and high speed or low power consumption is prioritized. It cannot be used in high-impedance precision applications where J-FET characteristics are essential, such as photodetection or medical instrument front ends.
Analysis ID: B606-7207000
Based on part parameters and for reference only. Not to be used for procurement or production.
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