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--- reference:part_numbers [2014/02/09 18:34] – created Alan Shea
+++ reference:part_numbers [2018/05/28 22:29] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
 Part numbers in drawings and bill of materials starting with "//MT//" are MetaTek part numbers. The Bill of Materials links the //MT// part number to a manufacturer and model for a particular item.
-In some cases, manufacturers have discontinued parts or updated them with new part numbers. When this is the case, a suffix letter (//A-Z//) is added to the part number. Parts with identical numbers except for the suffix letter should be functionally identical. Unless noted, newer parts (higher letter) should be drop-in replacements, and where a choice of OEM((Original Equipment Manufacturer part)) parts does exist, the newer part should be preferred. However, in every such case, care should be taken to verify that the replacement will work satisfactorily.
+  * **[[MetaTek Parts]]**
+In some cases, manufacturers have discontinued parts or updated them with new part numbers. When this is the case, a revision suffix letter (//A-Z//) is added to the part number. Parts with identical numbers except for the suffix letter should be functionally identical. Unless noted, newer parts (newer revision letter) should be drop-in replacements, and where a choice of OEM((Original Equipment Manufacturer part)) parts does exist, the newer part should be preferred. However, in every such case, care should be taken to verify that the replacement will work satisfactorily.
 ===Examples===
@@ Line 19: / Line 21: @@
 Third letter of part number:
-^Prefix ^ Function ^
+^ Prefix  ^ Function                                           ^
-^   A   | ..         |
+^    A    | Assembly*                                          |
-^       |            |
+^    B    | Battery*                                           |
+^    C    | Capacitor*                                         |
+^    D    | Diode, LED*                                        |
+^    E    | Circuit Breaker                                    |
+^    F    | Fuse*                                              |
+^    G    | Generator*                                         |
+^    H    | Hardware                                           |
+^    J    | Plug, Jack, Connector                              |
+^    K    | Relay/Contactor*                                   |
+^    L    | Inductor or coil*                                  |
+^    M    | Motor*                                             |
+^    N    | MechaNical                                         |
+^    O    | ..                                                 |
+^    P    | Pilot, Lamp, Indicator                             |
+^    Q    | Transistor/semiconductor*                          |
+^    R    | Resistor*                                          |
+^    S    | Switch*                                            |
+^    T    | Transformer*                                       |
+^    U    | Inseparable assembly, such as integrated circuit*  |
+^    V    | Meter                                              |
+^    W    | Wire                                               |
+^    X    | un-paired connector                                |
+^    Y    | Crystal or Oscillator*                             |
+^    Z    | Zener diode*                                       |
+^   ..    | ..                                                 |
+//* = Standard electronics part reference designator.//
+====References===
+  * http://en.wikipedia.org/wiki/Reference_designator
+  * http://www.k-state.edu/ksuedl/publications/Technote%208%20-%20Guidelines%20for%20Drawing%20Schematics.pdf
+  * http://www.radio-electronics.com/info/formulae/electronic-component-symbols/diagram-symbols-overview.php

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