AIA/NAS 853-2013 pdf download FIELD FORCE,PROTECTION FROM
1 .0 SCOPE
1 .1 This Standard provides a method for the protection of items, components and assemblies, e.g., field effect transistors, micro diodes, etc., which may be damaged by field forces (electrostatic, electromagnetic, magnetic or radioactive) encountered in non-operating environments.
2.0. REFERENCES
2.1 NAS380, General Packaging Standard.
3.0 REQUIREMENTS
3.1 General
3.1 .1 Field Force Protection as described herein shall be supplemented by preservation, packaging, packing, and marking for shipment and storage as required by NAS850, or NAS detail packaging standards.
3.1 .2 Each item shall be individually and completely enclosed in materials capable of providing adequate protection against field forces as described herein.
3.1 .3 Electrostatic Protection – Shall be provided by a plastic bag/wrap or containers that are conductive or antistatic having sufficient conductivity to provide electrostatic discharge protection to electrostatic discharge sensitive devices and assemblies such as microelectronic metal oxide semiconductors (MOS), field-effect transistors (FET) and printed circuit boards (PCB). Cushioning materials shall provide electrostatic discharge protection and be non-corrosive. The materials shall have a maximum surface resistivity of 2 x 1 0° ohms, when tested in accordance with ASTM D257-66 and a maximum bleed-off time of 2 seconds for 5,000 volts static electricity, when tested in accordance with Method 4046 of MIL-STD-301 0. Items subject to electric discharge damage shall not be subjected to an environment that would cause damage to the part during handling and packaging.
3.1 .4 Electromagnetic Protection – Shall be provided by overwrapping the device, already packaged in antistatic plastic in accordance with Para. 3.1 .3, with aluminum foil or a bag fabricated from an aluminum foil bearing laminate. Foil laminate bags shall be constructed by center folding a single sheet of material of proper size to eliminate possible capacitor effects. Over wraps, other than those prescribed in 3.1 .3, shall not be allowed to contact static sensitive items, even after removal. CAUTION: IN NO CASE SHALL THE ALUMINUM FOIL BE ALLOWED TO COME INTO DIRECT CONTACT WITH THE DEVICE.