SMT PACKAGING PREPRESS
EIA-481 SMT Carrier Tape Pocket Tooling & Prepress Guide
Surface mount components are delivered to high-speed pick-and-place placement machines in continuous embossed carrier tapes sealed with top cover tape. Designing defect-free carrier pockets prevents component flipping, tilting, and feeder jams.
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1. Pocket Sizing Tolerances & Vacuum Pickup
Cavity clearance must allow free component entry during taping without allowing excessive rotation ($< 10^\circ$). Dimensions follow EIA-481: $A_0 = L_{\text{max}} + 0.15\text{ mm}$, $B_0 = W_{\text{max}} + 0.15\text{ mm}$, and $K_0 = H_{\text{max}} + 0.20\text{ mm}$.
2. Engineering Specifications & Tolerances
| Tape Width (W) | Standard Pitch (P1) | Max Component Size | Standard Pocket Material |
|---|---|---|---|
| 8 mm Tape | 2 mm / 4 mm | 0402 to 1206 passives | Conductive Polystyrene (PS) |
| 12 mm Tape | 4 mm / 8 mm | SOIC-8, SOT-223, Inductors | Anti-Static Polycarbonate (PC) |
| 16 mm Tape | 8 mm / 12 mm | DPAK, SOP-16, QFN-32 | Conductive Tri-Laminate PS |
| 24 mm Tape | 12 mm / 16 mm | QFP-44, Large Connectors | Clear Anti-Static PET |
3. Thermoforming Carrier Tape Mold DXF Rules
- Pocket Sidewall Draft: Include a 4° - 6° draft angle on cavity walls to ensure clean thermoforming mold ejection.
- Bottom Corner Radii: Apply R = 0.25mm fillets at cavity floor corners to eliminate stress cracking in polystyrene tape.
- Center Hole Venting: Position a 1.0mm - 1.5mm bottom hole center in 1:1 DXF for optical component detection and vacuum pin assist.
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