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package includes 10 pieces of LD1117V33 three-terminal linear voltage regulators in TO-220 package. It provides a stable 3.3V DC output with up to 0.95A output current, suitable for various electronic circuits requiring steady low-voltage power supply. Featuring low dropout voltage, good ripple suppression and strong temperature stability, it is widely used in microcontroller systems, DIY electronic kits, industrial control boards, power supply modules and consumer electronic devices. The standard TO-220 packaging ensures good heat dissipation and easy installation. This 10-piece set is economical and practical for electronic maintenance, production and experimental development.