Original Part
Linear Voltage Regulator IC Positive Fixed 1 Output 200mA 4-USPN (0.90x1.2)
Alternative Part
Linear Voltage Regulator IC Positive Fixed 1 Output 200mA 4-USPN (0.90x1.2)
Linear Voltage Regulator IC Positive Fixed 1 Output 200mA 4-USPN (0.90x1.2)
1. XC6221C25A7R-G Substitution Conclusion
The XC6221C25A7R-G is a viable substitute for the original part, offering key performance improvements at the cost of increased quiescent current. The primary differences are as follows:
First, the quiescent current (Iq) increases from 19µA to 50µA. Under standby or light-load conditions, its self-consumption is approximately 2.6 times that of the original part. This negatively impacts battery life in ultra-low-power applications.
Second, the power supply rejection ratio (PSRR) is significantly improved from 50dB to 70dB (@1kHz). The new device offers markedly better rejection of input power supply noise (e.g., switching regulator ripple), providing a cleaner and more stable output voltage. This is particularly beneficial for noise-sensitive analog or RF circuits.
Third, the dropout voltage is 0.17V at a 100mA load. It is inferred that at the full 200mA load, it will likely outperform the original part's 0.38V. As the battery voltage declines, the new device can maintain a stable output at a lower input voltage, offering a wider effective operating range.
For applications that can tolerate a moderate increase in quiescent current, the XC6221C is a superior performance alternative.
2. XC6221D25A7R-G Substitution Conclusion
The XC6221D25A7R-G is electrically identical to the XC6221C version. Therefore, the substitution conclusion regarding its performance improvements and increased quiescent current is consistent with the C version described above.
The key distinction between the "D" and "C" suffixes typically lies in internal compensation or output capacitor ESR requirements. For the Torex XC6221 series, the "D" variant usually indicates internal phase compensation. This allows the use of low-ESR ceramic capacitors (typically ≥1µF) without requiring an additional series resistor for stability, whereas the "C" version may have specific ESR requirements.
If the original design or the intended replacement uses a low-ESR ceramic output capacitor, the D version is a more reliable and compatible drop-in replacement. It mitigates the risk of potential oscillation due to output capacitor ESR mismatch.
Provided the output capacitor meets its specifications, the XC6221D25A7R-G is a high-performance and stable alternative.
Analysis ID: CA46-6E6C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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