This SOT23 SMD transistor kit provides a readytouse assortment of common general purpose transistors in a compact package. It includes 10 different transistor types, 10 pieces of each type, for a total of 100 pieces. The kit is designed to support prototyping, , and learning circuits that rely on smallsignal switching and amplification. Included transistor types (10 kinds x 10 pcs = 100 pcs) S9013 S9014 S9015 S9018 MMBT3904 MMBT3906 SS8050 SS8550 2N5551 2SC1815 Key attributes Package and form factor: SOT23 threepin surfacemount transistors suitable for compact PCB layouts and hand or machine assembly. Functionality: a selection of general purpose transistors suitable for smallsignal amplification and switching. Compatibility: designed for standard SMD board designs and reflow/soldering processes. Size and material: plastic molded SOT23 transistors, providing a small, lightweight option for dense circuits. Performance orientation: suitable for a variety of typical generalpurpose transistor applications encountered in hobby, prototyping, and educational settings. Quantity and coverage: 10 distinct transistor types, with 10 pieces of each type, ensuring you have multiple units for multiple projects or experimentation. Use cases and applications Prototyping and experiments: build and test smallsignal switches and amplifiers in microcontroller projects or sensor interfaces without sourcing individual parts. Repairs and replacements: damaged transistors in compact devices or compact boards where SOT23 parts are preferred for space savings. Educational projects: learn transistor operation, biasing, and circuit behavior using a ready assortment of common part types in a single kit. This kit provides a practical, professional assortment of widely used SOT23 transistors in a single package, making it easier to design, build, and smallsignal electronics and educational projects.