2. AD822BRZ-REEL Substitution Conclusion The AD822 also offers superior bandwidth (1.9 MHz) and slew rate (3 V/µs) compared to the OPA2251, making it suitable for higher-speed applications. However, its input offset voltage (300 µV) is three times that of the original part (100 µV), which introduces greater inherent error in high-precision DC amplification circuits. The primary substitution barrier, again, is the supply voltage range (5 V to 30 V). Its 5 V minimum operating voltage makes it incompatible with systems operating below 5 V. Furthermore, its quiescent current (1.24 mA) is two orders of magnitude higher than the OPA2251's (54 µA per dual channel). In power-sensitive applications like battery-powered systems, substitution would drastically reduce operational lifetime. For applications where the voltage range is compatible (5 V–30 V) and power consumption is not a critical concern, the AD822 can serve as a higher-performance substitute, albeit with the trade-offs of slightly degraded DC accuracy and significantly increased power draw. For low-voltage or ultra-low-power designs, direct substitution is not feasible.