Power-supply filter ICs are not a specific brand but a category of electronic components designed to stabilize and clean power supply signals in various circuits. These ICs are produced by multiple manufacturers worldwide, including companies like Texas Instruments (USA), STMicroelectronics (Switzerland), and Murata (Japan). They serve industries such as consumer electronics, automotive, industrial automation, and telecommunications, providing noise suppression, voltage regulation, and EMI filtering. Key products include active/passive filters, DC-DC converters, and EMI suppression modules, ensuring reliable power delivery in sensitive applications.