Original Part
Alternative Part
1. AD746JRZ Substitution Conclusion
The AD746JRZ cannot serve as a direct or general-purpose replacement for the TL082IYDT. While it offers significant advantages in AC performance, there are critical differences in key DC parameters and power consumption. The AD746's slew rate (75 V/µs) and gain-bandwidth product (13 MHz) far exceed those of the TL082 (16 V/µs, 4 MHz), making it superior for high-speed signal processing or high-frequency applications. It also features lower input offset voltage (300 µV), providing higher DC accuracy. However, its input bias current (110 pA) is an order of magnitude higher than the TL082's (20 pA), which could introduce greater error in precision integrators or high-impedance sensor front-end applications where input current sensitivity is critical. More importantly, its quiescent current (7 mA) is five times that of the TL082 (1.4 mA), significantly increasing system power dissipation and heat generation. Furthermore, its minimum operating voltage (9 V) is higher than the TL082's (6 V), limiting its use in low-voltage systems. Additionally, the AD746 lacks the AEC-Q100 automotive-grade qualification that the TL082 possesses, making it entirely unsuitable for original designs with automotive requirements.
2. AD648JRZ-REEL7 Substitution Conclusion
Similarly, the AD648JRZ-REEL7 cannot be used as a direct, general-purpose substitute for the TL082IYDT. It is a specialized op-amp that trades off ultra-low power consumption for limited bandwidth. Its core advantage is an extremely low quiescent current (340 µA per dual channel), which is significantly lower than the TL082's 1.4 mA, making it highly attractive for battery-powered devices or applications with stringent power constraints. Concurrently, its input bias current (5 pA) is exceptionally low, outperforming the TL082, making it well-suited for micro-current applications such as photodiode detection. These benefits come at a substantial performance cost: its gain-bandwidth product (1 MHz) and slew rate (1.8 V/µs) are both inferior to those of the TL082. It is slower and has poorer high-frequency response, rendering it unsuitable for the moderate-bandwidth signal processing scenarios the original design may rely on. Its output drive capability (15 mA) is also weaker. Like the AD746, it has a higher minimum operating voltage (9 V) and lacks automotive qualification, thus it is not applicable for designs requiring a wide supply range (down to 6 V) or automotive-grade reliability.
Analysis ID: 82ED-D806000
Based on part parameters and for reference only. Not to be used for procurement or production.
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