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Why do companies create their own part numbers for electronic components?

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MOSIUR540:
By making the unique part number, is it possible to reduce the counterfeit IC?

jh15:
are the hp xrefs available now? As in BAMA, etc?

srb1954:

--- Quote from: free_electron on June 12, 2015, 05:16:03 am ---
--- Quote from: German_EE on June 10, 2015, 08:56:44 pm ---HP were terrible for this. That blown IC in your expensive piece of equipment could be an ASIC or a quad NAND but all you see is the HP part number on the top so they are the only source of spares. Bad news if support for your equipment ended ten years ago.

--- End quote ---
Nonsense. Hp had the decency of publishing the cross reference list. You can trace every hp number.

--- End quote ---
Not every HP part number. On several occasions I have searched for HP part numbers and have not found them on any of the published cross reference lists.

thermistor-guy:

--- Quote from: philby on June 10, 2015, 09:41:17 am ---...  I’m thinking about putting forward a proposal that we change over to using an internal numbering scheme.
...Any other reasons anyone can think of? I'm open to criticisms of the reasons I've listed. ...

--- End quote ---

Restricted characteristics: You may need a part to have a certain characteristic that only some manufacturers meet. Your internal p/n system can accommodate that. Examples that I've encountered:

** a telephony line interface circuit uses a common signal diode, but the diode's leakage current at Vr=100V must meet a certain limit. Only some OEMs guarantee it on the data sheet.
** a protection circuit relies on resistors that are rated for a certain overload condition. Only some resistor OEMs guarantee it.
** a product's connectors must have a certain gold plating spec. Only some connector OEMs offer that option.
** the PCB holes for a certain pin header were made too small, by mistake; luckily there is one OEM who mades headers that will just fit; you store those headers in your warehouse under a separate part number, for production and for servicing spares.

Traceability: You have a successful long-running product. Older units supposedly use the sames parts as current units, but the actual component OEMs used have changed over time. You're now getting strange field faults on some current units that don't appear on older units, and you're trying to relate the field failures to changes in component vendors. The history of changes to your part number system can help.

In-house component screening: you want to screen some components for a certain characteristic that no OEM guarantees. So you screen components in-house; the ones that pass get stored under a special part number.

AndyC_772:
Note to all: this thread is six years old...


--- Quote from: MOSIUR540 on May 03, 2021, 04:18:57 am ---By making the unique part number, is it possible to reduce the counterfeit IC?

--- End quote ---

No. How would it?

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