TL391B-Q1

The TL391B-Q1 is a precision voltage reference IC manufactured by Texas Instruments, designed for high accuracy and stability in industrial and automotive applications. It offers a fixed output voltage of 2.5 V with a typical initial accuracy of ±0.5%, ensuring reliable performance across varying operating conditions. The device operates over a wide supply voltage range from 2.7 V to 6.0 V, making it suitable for both low-voltage and standard power systems. This voltage reference features low temperature drift, typically 10 ppm/°C, which minimizes output variation due to thermal changes—an essential trait for precision analog circuits. Its low quiescent current, as low as 100 µA, enhances efficiency in battery-powered or energy-sensitive designs. The TL391B-Q1 also exhibits excellent load regulation, maintaining stable output even when the load current varies significantly, thereby supporting robust circuit design under dynamic conditions. The part is qualified to AEC-Q100 Grade 1 standards, indicating its suitability for automotive environments where reliability and durability are critical. It includes internal current limiting and thermal shutdown protection, which prevent damage from overcurrent or excessive junction temperatures. These safety mechanisms ensure long-term operational integrity in harsh electrical and thermal environments. Common applications include sensor signal conditioning, power supply regulation, data acquisition systems, and digital-to-analog converter (DAC) reference circuits. It is widely used in automotive electronics such as engine control units (ECUs), battery management systems (BMS), and infotainment modules, where consistent voltage references are required for accurate measurement and control. The TL391B-Q1 is available in a compact SOT-23-5 package, enabling space-efficient PCB layouts without compromising performance. Its pinout is optimized for easy integration into existing designs, reducing development time and simplifying layout considerations. With its combination of precision, low power consumption, and automotive-grade reliability, the TL391B-Q1 serves as a dependable solution for demanding analog and mixed-signal applications.