Original Part
Alternative Part
1. TL072ACDT Substitution Conclusion
The TL072ACDT can serve as a substitute only in non‑precision and non‑low‑noise applications, with significant performance compromises. Its input bias current (20 pA) is an order of magnitude higher than that of the AD8682 (6 pA), and its input offset voltage (3 mV) is more than eight times greater than the AD8682’s 350 µV. These differences may introduce noticeable errors in applications such as sensor amplification or high‑impedance signal acquisition. Furthermore, its quiescent current (1.4 mA) is substantially higher than the AD8682’s 210 µA per channel, making it unsuitable for low‑power designs. The TL072ACDT offers advantages in slew rate (16 V/µs) and output current (40 mA), which make it better suited for driving capacitive loads or general‑purpose circuits with moderate bandwidth requirements. It also carries AEC‑Q100 automotive qualification.
2. OPA2131UA/2K5G4 Substitution Conclusion
The OPA2131UA/2K5G4 is a highly viable direct substitute, with key parameters equal to or better than the original device. Its input bias current (5 pA) and offset voltage (200 µV) are superior to those of the AD8682, providing higher accuracy. The gain‑bandwidth product (4 MHz) and slew rate (10 V/µs) are slightly higher, offering improved dynamic performance. The supply voltage range (9 V to 36 V) matches the AD8682 exactly, and the output current (25 mA) meets typical requirements. Note that its quiescent current (1.5 mA per channel) is significantly higher than that of the AD8682; power consumption should be evaluated in extreme low‑power applications. Overall, however, the electrical characteristics are well aligned.
Analysis ID: 4102-18F6000
Based on part parameters and for reference only. Not to be used for procurement or production.
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