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Original Part

Standard Amplifier 2 Circuit 8-SOP

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Alternative Part

J-FET Amplifier 2 Circuit 8-SOIC

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Standard Amplifier 2 Circuit Differential 8-SOIC

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1. ADTL082ARZ-REEL7 Substitution Conclusion This part is a J-FET input operational amplifier. Direct substitution for a standard bipolar-input op-amp is not generally feasible, as it is primarily suited for applications with specific requirements for input impedance and speed. The core difference lies in the input stage, which uses JFETs instead of standard bipolar transistors. This results in significantly lower input bias current (2 pA vs. 60 nA) and higher speed (slew rate of 20V/µs, bandwidth of 5 MHz), making it well-suited for high-impedance sensor interfaces, integrators, sample-and-hold circuits, and similar applications. However, its input offset voltage is notably higher (1.5 mV vs. 500 µV), which may render it unsuitable for applications demanding high DC precision, such as precision amplification or voltage reference circuits. Additionally, its higher output current capability (27 mA) may lead to different thermal behavior when driving heavy loads. Substitution is not "plug-and-play"; a thorough re-evaluation of circuit requirements for DC accuracy, noise, and stability is necessary.
2. RC4558DRG4 Substitution Conclusion This part, a standard general-purpose dual op-amp from the same series, represents a highly compatible substitute for the original part, though power supply range and package details require verification. Its key parameters—input offset voltage (500 µV) and output current (10 mA)—match the original specifications. Performance is comparable or slightly improved, with marginally higher bandwidth (3 MHz) and slew rate (1.7V/µs). The primary differences are a slightly higher minimum operating voltage (10 V vs. 8 V). Direct substitution is not possible if the original circuit operates at or below 10V. Furthermore, its package is a narrow-body SOIC (3.90mm wide) versus the original wide-body SOP (4.40mm wide), necessitating an adaptation of the PCB layout. Overall, provided the supply voltage is sufficient and the PCB footprint can be adjusted, this is the closest functional and electrical substitute available.
Analysis ID: D210-D0B3000
Based on part parameters and for reference only. Not to be used for procurement or production.
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