SMT assembly Requirements
Documentation Requirements (electronic)
The following information is required for all component purchasing / receiving / verification / inspection / programming the pick & place equipment and assembly work instructions creation.
- BOM
- Component Description
- Quantity
- Reference Designator
- Manufacturer Part Numbers
- Indicate any “no load / do not install” (DNI) locations.
- If you are supplying components, please identify as “Customer supplied”
- CPL
- Reference designator
- X / Y – Centroid location (mils / in)
- Rotation
- Layer / Board side / (top / bottom – component mounting not silkscreen)
- Redline drawing for conformal coating
- Gerber files
- Assembly Drawings
- Component layout (top / bottom), polarity marking, special assembly instructions or any components that require special handling or processing, some examples may include
- Non- washable (Moisture sensitive) components – switches, sensors, modules
- Special prep / specific height / placement requirements
- Lead length / trim – make sure to include +/- tolerances
- Rework wires (pin to pin routing)
- Component mounting (top /bottom – opposite of silkscreen – polarity)
- Adhesives
- Labeling / Serialization – (format / location / type)
PCB Design - With varied production technologies
Lead time will be impacted if proper attrition is not supplied. We will always work with our customers when it comes to customer supplied components; the following is our standard guidelines. If you have expensive or a minimum quantity of any component on hand please contact the assembly sales team for details.
- Each component must be individually packaged, labeled with BOM line item number / customer part number and/ or manufacturers’ part number.
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The following are acceptable packages of consignment / customer supplied components (Bulk SMT not acceptable):
- SMT Reels
- Cut tape
- Thru-Hole bulk or tape
- Tubes / Trays
- Digi-Key Reels
| Package | Minimum Base | Minimum Overage |
|---|---|---|
| 0201 | 200 | 100 |
| 0402 | 100 | 50 |
| 0603 | 50 | 30 |
| SMT Diode | 30 | 15 |
| SMT IC | 30 | 15 |
| FP | 20 | 5 |
| LL | 20 | 5 |
| BGA | 10 | 5 |
| TH | 5 | 2 |
SMT components, not supplied on reels, are required to be on one continuous strip of tape. Resistors, Capacitors, Diodes (0603, 0805, 1206, 2225, SOT, SOD, MELF – packages) require a minimum of 50 pcs and/or has to exceed the required quantity by 30 pcs. (Example: build req. 40 pcs – we will require 70 pcs – this meets our minimum required 50 pcs plus 30 pcs above build requirement) Resistors, Capacitors, Diodes (0201, 0402, mini-melf, miniature packages) require a minimum of 100 pcs and/or has to exceed the required quantity by 50 pcs. (Example: build req. 80 – we will require 130 – this meets our minimum required 100 pcs plus 50 pcs above build requirement).