Original Part
Standard (General Purpose) Amplifier 1 Circuit Rail-to-Rail SC-88A (SC-70-5/SOT-353)
Alternative Part
1. APX321SEG-7 Substitution Conclusion
The APX321SEG-7 is only viable as a substitute in some non-critical applications, but it involves significant technical compromises, making a direct replacement inadvisable. The most critical differences lie in its markedly degraded input characteristics: an input offset voltage as high as 1.7mV (vs. 0.5mV for the original part) and an input bias current of 15nA (vs. 1pA for the original part). In circuits requiring high-precision amplification or processing of weak small-signals, this will introduce non-negligible error and temperature drift. Furthermore, its minimum operating voltage is 2.5V (vs. 1.8V for the original part), rendering it unusable in any low-voltage system below 2.5V. While it offers stronger output drive capability (90mA) and slew rate (1V/µs), this comes at the cost of a quiescent current (110µA) more than double that of the original part (48µA), which is detrimental to low-power designs.
2. LMV321SEG-7 Substitution Conclusion
The viability of the LMV321SEG-7 as a substitute is largely consistent with that of the APX321SEG-7; it is similarly not recommended for direct replacement and exhibits even worse voltage compatibility. It shares the identical precision disadvantages (1.7mV input offset voltage, 15nA bias current) as the APX321SEG-7 and is therefore equally unsuitable for precision amplification circuits. Its minimum operating voltage is even higher at 2.7V, further narrowing its applicable voltage range and completely failing to cover the original part's operating range starting from 1.8V. Other characteristics, such as high quiescent current and high output current, are the same as the APX321SEG-7. In essence, the LMV321SEG-7 is a substitute option with a higher voltage threshold but otherwise identical to the APX321SEG-7.
Analysis ID: CAC7-DCCE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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