Original Part
Alternative Part
1. AD8682ARZ Substitution Conclusion
The AD8682ARZ can directly replace the LT1464CS8 with overall superior performance. Both are J-FET input dual op-amps in a compatible package (8-SOIC), but the AD8682 offers significant improvements in key parameters: higher bandwidth (3.5 MHz vs. 1 MHz) and slew rate (9 V/µs vs. 0.9 V/µs) enable faster dynamic response, making it suitable for higher-frequency signal processing; lower input offset voltage (350 µV vs. 600 µV) provides better DC accuracy; and a wider supply range (9 V to 36 V) enhances adaptability. Note that its input bias current is slightly higher (6 pA vs. 0.5 pA), though this has limited impact in most high-impedance applications. Additionally, the quiescent current per channel is moderately increased (210 µA), which should be verified in power-sensitive designs.
2. LM258DG4 Substitution Conclusion
The LM258DG4 is not suitable as a direct replacement for the LT1464CS8 except in applications with very low precision requirements. While both share the same package, the LM258 is a general-purpose bipolar op-amp, fundamentally different from the J-FET input LT1464: its input bias current is as high as 20 nA (40,000 times greater than the LT1464), and its input offset voltage reaches 3 mV (5 times higher). These characteristics introduce significant errors in high-impedance signal sources, precision amplification, or integrator circuits. Although the LM258 offers a wider supply range (3 V to 32 V) and higher output current capability, its bandwidth (1.1 MHz) and slew rate (0.3 V/µs) are lower, limiting dynamic performance. Substitution should only be considered in applications where input impedance, DC accuracy, and speed are not critical.
Analysis ID: 1AEB-2D5C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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