Original Part
Alternative Part
1. TLE2082ACDG4 Substitution Conclusion
As a substitute, the TLE2082ACDG4 is compatible in core functionality (dual-channel JFET op-amp) and package (8-SOIC). However, its key performance parameters are significantly inferior to the original part, making direct substitution generally unsuitable for demanding high-precision or high-speed applications. First, its input bias current (20 pA) is nearly seven times higher than that of the AD8620 (3 pA), which will introduce greater DC error and noise in high-impedance signal source applications such as photodetection or ion measurement. Second, its input offset voltage (700 µV) is more than an order of magnitude higher than that of the AD8620 (45 µV). This will introduce non-negligible system offset error in DC-coupled or precision amplification circuits, significantly degrading measurement accuracy. Third, both its gain-bandwidth product (10 MHz) and slew rate (40 V/µs) are substantially lower than those of the AD8620 (25 MHz, 60 V/µs), resulting in weaker capability to handle high-frequency signals or fast transients and poorer dynamic response. The TLE2082ACDG4 offers a wider supply voltage range (4.5 V to 38 V). If the application is not sensitive to precision and speed, and only requires basic JFET input buffering across a wide supply range, it may serve as a downgrade alternative.
2. TLE2082ACDR Substitution Conclusion
The substitution conclusion for the TLE2082ACDR is identical to that for the TLE2082ACDG4. This is because the two differ only in manufacturer internal coding or packaging form (e.g., reel specifications), while all technical parameters, core die, and performance are exactly the same. It is likewise unsuitable for directly replacing the AD8620 in designs with strict requirements for low input bias current, low offset voltage, or high bandwidth/slew rate. In substitution evaluation, the same three key performance gaps must be carefully assessed: higher input bias current degrades performance in high-impedance circuits, higher input offset voltage directly reduces DC accuracy, and lower bandwidth and slew rate limit signal processing speed and fidelity. If the target application can tolerate these performance compromises and values the wider supply voltage adaptability, both devices can be considered as functionally compatible alternatives.
Analysis ID: EA13-766B000
Based on part parameters and for reference only. Not to be used for procurement or production.
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