Voltage references are not a specific brand but a category of electronic components used to provide a stable and precise voltage in circuits. They are produced by various manufacturers worldwide, including Texas Instruments (USA), Analog Devices (USA), Maxim Integrated (USA), and Linear Technology (USA). These components are critical in industries such as automotive, industrial automation, medical devices, and consumer electronics. Key products include series voltage references (e.g., LM4040 by Texas Instruments), shunt references (e.g., LTZ1000 by Analog Devices), and bandgap references, ensuring accuracy in analog-to-digital converters, power supplies, and measurement systems.