Original Part
Alternative Part
1. LM258DRG4 Substitution Conclusion
Direct substitution is not viable. A significant generational performance gap exists between the LM258DRG4 and the original part, ISL28210FBZ-T13. Key parameters differ substantially: input bias current is nearly five orders of magnitude higher (20 nA vs. 0.3 pA), input offset voltage is 10x greater (3 mV vs. 300 µV), and both bandwidth (700 kHz vs. 12.5 MHz) and slew rate (0.3 V/µs vs. 20 V/µs) are critically insufficient. Consequently, the LM258DRG4 is unsuitable for critical applications involving high-impedance signal sources, precision measurement, or high-speed signal processing. Substituting it would result in a loss of circuit accuracy, severely limited bandwidth, and degraded dynamic response. Its use should be confined only to non-critical, general-purpose amplification circuits with extremely relaxed requirements for input error, speed, and precision, and full system performance re-validation would be mandatory.
2. LM258DRG3 Substitution Conclusion
Direct substitution is not feasible, with the conclusion being identical to that for the LM258DRG4. The LM258DRG3 shares identical electrical parameters with the LM258DRG4—such as 20 nA input bias current, 3 mV offset voltage, and 700 kHz bandwidth—with the differing suffix likely representing only internal Texas Instruments version or manufacturing flow codes. It similarly exhibits the same vast performance chasm compared to the original J-FET op-amp ISL28210FBZ-T13 in terms of input impedance, precision, bandwidth, and speed. It cannot meet the original design's requirements for low input current, high accuracy, and high speed. Substitution carries the same risk of performance degradation and is applicable only to undemanding, general-purpose amplification circuits.
Analysis ID: C102-1B2C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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