KA78R33 3.3V 1A voltage regulator in TO220F package is a fixed regulator designed to provide a stable 3.3V output from a higher input voltage. This listing includes 5 pieces. The KA78R33 operates as a linear regulator and is suitable for projects that require a reliable 3.3V rail with up to 1 A of output current. Key benefits Delivers a stable 3.3V output at up to 1 A load current, enabling reliable power for 3.3V logic and peripherals. Simple, widely used voltage regulation solution with a straightforward pinout for easy circuit design and breadboard experimentation. TO220F package with a metal tab provides effective heat dissipation and facilitates mounting to a heatsink or chassis, improving performance in compact assemblies. Commonly used in educational, hobby, and professional electronics to generate a 3.3V rail from higher input voltages. Available in a small, cost effective 5 piece kit suitable for project builds and spare parts. Key attributes Functionality: fixed 3.3V output regulation, up to 1 A. Compatibility: suitable for standard 3.3V powered circuits, compatible with typical input voltages higher than 3.3V when proper input and output capacitors are used. Package: TO220F throughhole mounting style. Material and build: encapsulated regulator in a TO220F package designed for reliable performance in common power circuits. Performance: fixed output regulation suitable for supplying 3.3V rails in microcontroller, sensor, and peripheral applications; requires external capacitors for stability as per typical regulator guidelines. Pinout (TO220F, front view): left pin is Input, middle pin is Ground, right pin is Output. Recommended usage and considerations Input and output capacitors are typically recommended to ensure regulator stability and transient response. Ensure the input voltage remains higher than 3.3V by the regulator's dropout margin under load, and provide adequate heat sinking if operating near the 1 A limit. Suitable for projects that require a simple, reliable 3.3V supply without complex regulation circuitry. Use cases Powering a 3.3V microcontroller and 3.3V peripherals from a 5V supply in a hobbyist or development board. Supplying a compact embedded system where a stable 3.3V rail is needed for sensors, transceivers, or low power modules. Replacing a 3.3V regulator on an existing board to improve availability or standardize components across multiple designs. Package and contents 5 pieces of KA78R33 3.3V 1A voltage regulator in TO220F format per pack. Suitable for throughhole mounting on PCBs or development boards with heat sinking as required.