MIL-STD-1285 Marking Of Electrical And Electronic PartsThis standard establishes requirements for the physical marking of electrical and electronic parts. This standard should be implemented by incorporating suitable requirements directly in acquisition documents.

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MIL-STD-1285D

w/ CHANGE 1

5.2.5 Date code. A four-digit number shall identify the date of the inspection lot and shall be in accordance with the following:

a. Year: The first two digits shall correspond to the last two digits of the calendar year.

b. Week: The last two digits shall indicate the week of the calendar year. If only one number is required to indicate the week, it shall be preceded by a zero. The first week shall be considered the week in which the first Thursday of the year falls. It is possible that a calendar year may have 53 production

weeks, if so the 53rd week shall be marked as 53. The first day of the week shall be considered

Sunday.

5.2.6 Lot symbol. Where a lot symbol is required by the acquisition document, a single letter shall be used to identify a production lot. The letters shall be assigned alphabetically; however, letters "I", "O", "Q", "S", and "U" shall not be used. Where a single letter lot symbols do not cover the number of lots produced, double letters (such as AA, BB,.. AB, AC,... BA) shall be used.

5.2.7 Characteristics and ratings. Characteristics and ratings shall be as specified in the acquisition document.

5.2.8 Distributor's symbol. The distributor's symbol may be marked on the part only when authorized by the manufacturer of the part.

5.3 Color coding (method II). When method II marking is applicable, requirements shall be specified in the acquisition document. Color codes for part identification marking shall be as specified in table II. Requirements shall be coded by using dots or bands as specified in the acquisition document.

5.3.1 Part. Certain parts shown in table II shall be identified as such by a single dot or band. This code element, which has no numerical or functional significance, shall be twice the width or diameter of all other code elements and shall simply signify that it is a particular kind of a part. This first code element shall determine from which direction to read the significant code elements. When specified in the acquisition document, the code element also shall

indicate polarity or other terminal identification.

5.3.2 Electrical characteristics. Functional designations used to denote electrical characteristics, such as resistance, capacitance, and inductance shall be as specified in table II, unless otherwise specified in the FSC section.

5.3.3 Other characteristics and ratings. Other characteristics and ratings shall be as specified in the acquisition document.

5.4 Electrostatic discharge (ESD) sensitive device items.

a. Electrical and electronic parts classified as sensitive to damage from electrostatic discharge in accordance with MIL-STD-1686 or EIA-STD-625 (as specified in each specification) and MIL-HDBK-263 shall be marked in accordance with the ESD symbol (see figure 2).

b. Assemblies containing ESD parts shall be marked with the ESD symbol. This symbol shall be so located as to be readily visible when the assembly is installed in its next higher assembly, if applicable. When the physical size of the assembly precludes direct marking of the ESD symbol, the assembly shall be marked on an identification tag and attached securely to the assembly. The ESD unit pack shall be marked in accordance with MIL-STD-129 .