SMDtypes

SMDtypes is a taxonomy used in electronics to classify surface-mount device (SMD) packages and form factors. It serves as a descriptive framework to help engineers, buyers, and suppliers communicate part specifications and footprint requirements. The term covers passive components such as chip resistors and capacitors as well as active devices in SMD packages.

Classification: SMDtypes groups parts by package family (for example chip-scale, flat no-lead, or gull-wing), by size code (such as 0402, 0603, 0805, 1206 for small-passive devices), by lead configuration (2-terminal, 3- or 4-lead devices, leaded vs. no-lead), and by function or package family (resistors, capacitors, ICs in QFN, SOIC, QFP, DFN, BGA). Some schemes also consider mounting method and electrical characteristics.

Standards: The taxonomy aligns with published outlines and land-pattern standards from IPC and JEDEC. IPC-7351 provides footprint guidance; IPC-2221 covers generic PCB design; vendor datasheets supply precise package dimensions. footprint libraries translate SMDtypes categories into practical land patterns for assembly.

Applications: SMDtypes is used during PCB design, procurement, and assembly planning to standardize parts, verify footprint compatibility, and enable cross-source part identification. It supports cataloging components from multiple vendors with similar form factors.

Notes: SMDtypes is not a universal standard but an organizational convention. When selecting parts, designers should consult official package drawings and land-pattern data to ensure compatibility with the intended PCB and manufacturing process.