Reference designators in circuit diagrams

[Matthias Weingart]

Currently some friends and I discussing what kind of reference
designators should be choosen for international designs.
(circuit diagrams that are common for people from US, Europe and Asia)

From this document:
http://www.pcblibraries.com/downloads/files/Reference%20Designators.zip
I read for example:
U - integrated circuit
X - subcircuit

but in several english journals often "IC" is used for a integrated
circuit and "X" for connectors. (and here in Germany we use different
designators and also symbols).

What is the right (best) way? Not only for that two, for all commonly
used components.

M.
--
Bitte auf mwnews2@pentax.boerde.de antworten.

 

[Tim Shoppa]

My engineering organization, after extensive meetings and discussions,
reached this compromise:

Use "U" for integrated circuits on the right side of the schematic.

Use "IC" for integrated circuits on the left side of the schematic.

Use "X" for IC's that interface to a balkanized sub-organization. Use
"X" for connectors in the rest of the circuit.

Tim.

 

[Ken Smith]

In article <Xns95EF968AA82FEAlwLookOnTBrightSide@212.21.75.70>,
Matthias Weingart <mwnews@pentax.boerde.de> wrote:

Currently some friends and I discussing what kind of reference
designators should be choosen for international designs.
(circuit diagrams that are common for people from US, Europe and Asia)

From this document:
http://www.pcblibraries.com/downloads/files/Reference%20Designators.zip

I suggest:

B RF beads
C Capacitors
D Diodes
J Connectors
JP Other connectors (Usually config Jumpers etc)
K Relays
L Inductor
M Other elctro-dynamic
P P1 mates to J1 if the schematic covers 2 PCBs
Q Transisors
R Resistors
S Switches
T Transformers
U ICs
W Mystery components
X Mounting holes (When needed for making grounds)
Z Other impedance devices.
--
--
kensmith@rahul.net forging knowledge

 

[JeffM]

discussing what kind of reference designators
should be choosen for international designs
for example:
U - integrated circuit
X - subcircuit
but in several english journals
often "IC" is used for a integrated circuit and "X" for connectors
Matthias Weingart

U - any unrepairable subassembly
(or complex component that would not have been integrated 50 years
ago)

I've also seen an x as a prefix for socketed parts e.g., xU14.

I hate *IC* as much as I hate *CR*
--just takes up more real estate on the schematic & silkscreen.


Tim's points at the proper solution:
Set up a playbook within your organization and make sure everybody
sticks to it.
Even if it is a foolish standard, it is THE standard.

 

[Fred Bartoli]

"JeffM" <jeffm_@email.com> a écrit dans le message de
news:1107204300.820132.293100@f14g2000cwb.googlegroups.com...

discussing what kind of reference designators
should be choosen for international designs
for example:
U - integrated circuit
X - subcircuit
but in several english journals
often "IC" is used for a integrated circuit and "X" for connectors
Matthias Weingart

U - any unrepairable subassembly
(or complex component that would not have been integrated 50 years
ago)

Any complex unrepairable subassembly is refrenced as Uhh...


--
Thanks,
Fred.

 

[Paul Burke]

JeffM wrote:

I hate *IC* as much as I hate *CR*
--just takes up more real estate on the schematic & silkscreen.

Everyone knows what an IC is, roughly, so the technician will know what
to look for. Transistors? TR of course, same reason. Relay- RL. You've
got to think about Fred with his head in the box, the works hot and
pounding around him, and the production manager screaming at him to fix
it. Of course, it's never MY designs they are fixing But anyway, they
are mostly plugging the board, not fixing it.

Space on the PCB is largely irrelevant these days- I no longer put
component designations on the PCB as there simply isn't room, 0603s and
all that. Much better a big paper printout with the designations bang on
each resistor, cap etc.

Of course, if you have more than 26 kinds of component, you will need
multiple letters anyway...

Paul Burke

 

[Matthias Weingart]

Thanks to all. It seems that everybody is doing his own stuff.

M.
--
Bitte auf mwnews2@pentax.boerde.de antworten.