The design principles of carrier tapes primarily revolve around four core objectives: precise component housing, compatibility with automated systems, environmental protection, and structural reliability. The design process is systematic, integrating the specific characteristics of electronic components with the operational requirements of SMT (Surface Mount Technology) production lines. The following outlines the key design principles:
Structural Design Principles
Cavity (Pocket) Design
Cavities are distributed at equal intervals along the length of the carrier tape and serve to house and secure individual electronic components (such as resistors, capacitors, ICs, etc.).
The dimensions of the cavities must precisely match the external contours of the components to prevent shifting or damage during transit; for deep cavities, a minimum bottom thickness (e.g., ≥ 0.12 mm) must be maintained to provide shock absorption.
Indexing Hole Design
Located along the edges on both sides of the carrier tape, these holes engage with the feeder gears of the pick-and-place machine to facilitate precise, step-by-step conveyance.
Common center-to-center spacings are 2 mm, 4 mm, and 8 mm; designs must comply with standards such as EIA-481, JIS C 0806, and IEC 60286-3.
