SMT assembly Requirements

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.
  • 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).