We (internally)have a growing debate going on in regards to reference designators. We have (long ago) adopted IEEE 315 as the "bible" for schematic symbol and reference designators, but the standard seems misleading. Take for instance OP-AMPs should have "AR" as the designations, OSCILLATORS should be "G", ATTENUATORS should be "AT" according to how you interpret the standard. But, aren't these all, in fact, microcircuits ("U") or integrated-circuit packages in today's practice? Does anyone else have a better system for defining reference designators, per "some" standard? It seems IEEE- 315/315A should have been out-dated long ago. Help? Mitch ################################################################ DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################