Re: Parts Numbering Scheme
- From: Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx>
- Date: Wed, 08 Jun 2005 01:14:57 +0100
Roger Lascelles wrote:
> We are a small company, and we would like to implement a better components
> numbering scheme.
>
> The parts numbers need to go into our accounting system and on parts lists,
> build lists and some schematics, so we don't want them to be too long.
>
> Letters and digits are OK, but each must start with a letter. Sort order is
> a consideration, because computers sort strings from left to right, often in
> ascii or similar order. That means each character position has significance
> and it might be best if every part had the same number of characters.
>
> The storeroom must be organised by part number, so that we can work
> systematically to find the correct shelf, container, then envelope or reel
> inside the container. We need to store similar parts together in the
> storeroom, to make the most of the containers. For example, SMD resistor
> reels are stored together, with a number of different resistor values in
> each container. This means SMD resistor part numbers must form a sequence,
> though not necesarily in order of ohms value.
>
> A part number should at least tell roughly what kind of part it is - SMD
> resistor, leaded electrolytic, etc, so that means the leftmost characters
> should carry that info so the sorted list is by part type.
>
> Now, does anyone have a system like that ? Or a different or better system
> ?
One of the best I've ever seen, used at a pro-audio manufacturer used a typical
prefix and and sub-descriptor suffix follwed by the value.
E.g. RA100K0 was a 2% 1/4W metal film resistor with value = 100k
RA033R0 was 33R in the same type. Note the use of 4 numerals in both cases to
make listings consistent.
RB, RC etc were different families of resistor type / tolerance / rating etc.
Simialar method used for other parts.
I like the text string idea too. But you need to keep to the format - and that
may be rather less easy to remember.
Graham
.
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