Mechanical part (including screws and fasteners) Jack (least-movable connector of a connector pair), Jack connector (connector may have "male" pin contacts and/or "female" socket contacts) printed circuit assembly)ĭiode (all types, including LED), thyristorĭisplay, general light source, lamp, signal light The table below lists designators commonly used, and does not necessarily comply with standards. The construction of reference designators is covered by IEEE 200-1975/ANSI Y32.16-1975 (replaced by ASME Y14.44-2008 ) and IEEE-315-1975. 1A1W35 - In the assembly A1 is a cable called W35.Ĭonnectors on this cable would be designated:ĪSME Y14.44-2008 continues the convention of Plug P and Jack J when assigning references for electrical connectors in assemblies where a J (or jack) is the more fixed and P (or plug) is the less fixed of a connector pair, without regard to the gender of the connector contacts.1A1A45J333 - Unit 1, Assembly 1, Sub-Assembly 45, Jack 333 (J333 is a connector on a box referenced as A45).1A1A44J5 - Unit 1, Assembly 1, Sub-Assembly 44, Jack 5 (J5 is a connector on a box referenced as A44).
1A12A2U3 - Unit 1, Assembly 12, Sub-assembly 2, Inseparable Assembly 3Įspecially valuable is the method of referencing and annotating cables plus their connectors within and outside assemblies.1A12A2R3 - Unit 1, Assembly 12, Sub-assembly 2, Resistor 3.Inseparable assemblies-i.e., "items which are ordinarily replaced as a single item of supply" -are typically treated as components in this referencing scheme. Note that IEEE-315-1975 defines separate class designation letters for separable assemblies (class designation 'A') and inseparable assemblies (class designation 'U'). Any number of sub-assemblies may be defined until finally reaching the component. Subsequent demarcation are called assemblies and always have the Class Letter "A" as a prefix following by a sequential number starting with 1. The unit is the highest level of demarcation in a system and is always a numeral.
It breaks down a system into units, and then any number of sub-assemblies.
This standard, along with IEEE 315-1975, provide the electrical designer with guidance on how to properly reference and annotate everything from a single circuit board to a collection of complete enclosures.ĪSME Y14.44-2008 and IEEE 315-1975 define how to reference and annotate components of electronic devices. To replace IEEE 200-1975, ASME, a standards body for mechanical engineers, initiated the new standard ASME Y14.44-2008. This standard codified information from, among other sources, a United States military standard MIL-STD-16 which dates back to at least the 1950s in American industry. This document also has an ANSI document number, ANSI Y32.16-1975. The IEEE renewed the standard in the 1990s, but withdrew it from active support shortly thereafter. IEEE 200-1975 or "Standard Reference Designations for Electrical and Electronics Parts and Equipments" is a standard that was used to define referencing naming systems for collections of electronic equipment.