Original Part
Alternative Part
1. LM2904DGKR Substitution Conclusion
The LM2904DGKR can serve as a viable substitute for the LM2904QDRG4, though attention must be paid to minor differences in package compatibility and output drive capability. Both devices share identical core performance parameters—such as a bandwidth of 700kHz, slew rate of 0.3V/µs, input bias current of 20nA—and the same supply voltage range of 3V to 26V, indicating they are different package versions of the same core die. The primary distinctions are as follows: the LM2904DGKR uses a smaller 8-VSSOP package, requiring verification of PCB space and assembly process compatibility; its output current is 30mA, slightly lower than the original part's 40mA, which reduces the design margin when driving heavy loads (such as low-impedance or high-capacitance loads). For general low-frequency applications—including amplification, filtering, and comparator circuits—that do not operate at the drive limit and can accommodate the package change, direct substitution is acceptable.
2. LT1253CS8TRPBF Substitution Conclusion
The LT1253CS8TRPBF is not a direct substitute for the LM2904QDRG4, as the two are fundamentally different types of operational amplifiers with distinct architectures and performance profiles. The LT1253 is a current-feedback amplifier designed for high-speed video or signal processing, featuring a -3dB bandwidth of 270MHz and a slew rate of 250V/µs. In contrast, the LM2904 is a general-purpose voltage-feedback op-amp with a bandwidth of only 700kHz. Critically, the LT1253 requires careful selection of external feedback resistors and typically offers lower DC accuracy (its input offset voltage is unspecified) compared to the LM2904, making it unsuitable for high-precision DC applications. Furthermore, its quiescent current of 6mA per amplifier is significantly higher than the LM2904's 1mA per channel (for a dual device), leading to substantially increased power dissipation. A direct replacement would fundamentally alter the circuit's frequency response, stability, and DC operating point, rendering the circuit non-functional in most cases.
Analysis ID: 84B2-5AFE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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