Original Part
Alternative Part
1. AD8646ARZ Substitution Conclusion
Under the condition of compatible supply voltage (system voltage ≥ 2.7V) and without requiring ultra-low power consumption, the AD8646ARZ can serve as a substitute for the TS1872AIDT, delivering significant performance improvements. However, this constitutes a downgrade-compatible substitution. The core differences are as follows: Firstly, its supply range (2.7V to 5.5V) is narrower than that of the original part (1.8V to 6V), rendering it inoperable in low-voltage applications between 1.8V and 2.7V, thus limiting its universality. Secondly, its quiescent current (1.5 mA per channel) is three times that of the original part (0.5 mA per channel), resulting in significantly increased power consumption, which is not favorable for battery-powered devices. Its performance advantages are comprehensively superior: the gain bandwidth product (24 MHz vs. 1.8 MHz) and slew rate (11 V/µs vs. 0.6 V/µs) are an order of magnitude higher, enabling signal processing with greater speed and bandwidth. The extremely low input bias current (0.3 pA vs. 70 nA) makes it suitable for applications such as high-impedance sensor interfaces. The lower input offset voltage (600 µV vs. 1 mV) contributes to improved DC accuracy.
2. AD8646WARZ-RL Substitution Conclusion
The AD8646WARZ-RL shares identical core electrical parameters with the AD8646ARZ. Consequently, the feasibility conclusion and technical differences regarding its substitution for the TS1872AIDT are exactly the same as those for the AD8646ARZ. It is similarly applicable in scenarios with compatible voltage requirements, where high performance is sought and higher power consumption is acceptable, and it is likewise constrained by the higher minimum operating voltage (2.7V) and quiescent current (1.5 mA per channel). The key distinction between the two parts lies in the suffix designations: "W" typically denotes a wider operating temperature range (e.g., -40°C to +125°C, compared to a standard grade of -40°C to +85°C), and "RL" likely indicates reel packaging (tape and reel). Therefore, the AD8646WARZ-RL may offer advantages in terms of environmental robustness (for high/low-temperature industrial environments) and suitability for automated assembly processes. However, the core electrical performance and substitution limitations remain unchanged.
Analysis ID: FBA8-45C0000
Based on part parameters and for reference only. Not to be used for procurement or production.
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