Original Part
Alternative Part
1. ISL28114FHZ-T7 Substitution Conclusion
The ISL28114FHZ-T7 is compatible with the original BU7271G-TR in terms of package, supply voltage range, and rail-to-rail output. However, its core performance parameters differ significantly, making it generally unsuitable as a direct replacement unless the application can tolerate its higher power consumption and requires higher speed. The key differences are as follows: The gain bandwidth product (5 MHz vs. 90 kHz) and slew rate (2.5V/µs vs. 0.05V/µs) are one to two orders of magnitude higher, enabling the ISL28114FHZ-T7 to handle high-frequency and fast-changing signals, whereas the BU7271G-TR is only suitable for very low-frequency or DC applications. The quiescent supply current (300µA vs. 8.6µA) is approximately 35 times higher, which is a critical drawback for battery-powered or ultra-low-power designs and would significantly reduce device runtime. Additionally, the ISL28114FHZ-T7 offers stronger output drive capability (31 mA vs. 8 mA) and slightly better input offset voltage (500µV vs. 1mV). These differences may require evaluation in specific designs.
2. ISL28114FHZ-T7A Substitution Conclusion
The ISL28114FHZ-T7A shares identical key electrical parameters, package, and description with the aforementioned ISL28114FHZ-T7 (typically, the suffix "A" may only indicate minor differences in reel packaging or production lot, with no impact on performance). Therefore, its substitution feasibility is the same as the T7 version. Similarly, it is not recommended as a direct replacement for the BU7271G-TR unless the application can fully accommodate the fundamental trade-off of higher speed performance (5 MHz bandwidth, 2.5V/µs slew rate) for significantly higher quiescent power consumption (300µA). This substitution essentially replaces an ultra-low-power, low-speed amplifier with a medium-power, medium-speed amplifier, each suited for distinctly different application domains. The former is intended for ultra-low-power scenarios such as sensor signal conditioning and long-term monitoring, while the latter is better suited for portable device signal processing requiring moderate signal bandwidth. A thorough re-evaluation of the system's power budget and frequency response requirements is mandatory before proceeding with the replacement.
Analysis ID: B71F-8089000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com