LM193QML: Can you suggest the meaning of "R" which is the marking of LM193AJRQMLV

Icgoo Icgoo

Part Number: LM193QML
Other Parts Discussed in Thread: LM193

Hello,

We purchesed the part of LM193AJRQMLV many times. The letter R was not included in the marking of the parts I ordered before, but this time it arrives with the letter R, please help explain the reason.

Thanks a lot,

Gloria.

over 1 year ago

0 Paul Grohe over 1 year ago

TI__Guru 53946 points

Hello Icgoo,

What exact part number were you ordering in the past?

The "R" denotes 100krad radiation testing.

0 Icgoo Icgoo over 1 year ago in reply to Paul Grohe

Intellectual 280 points

The exact part number we ordering in the past is also LM193AJRQMLV, but there is no letter 'R'.

Can you help to suggest the reason for the difference?

Thank you.

0 Paul Grohe over 1 year ago in reply to Icgoo Icgoo

TI__Guru 53946 points

Hello Icgoo,

Do you have any photos of the top of the non-R devices?? Or photos of the labels?

If you ordered a LM193AJRQMLV, the marking on the top should be the same (LM193AJRQMLV).

The non-R devices should have a dash "-" in place of the R (LM193AJ-QMLV). There is not a valid part number such as LM193AJQMLV (no R or dash).

0 Icgoo Icgoo over 1 year ago in reply to Paul Grohe

Intellectual 280 points

Hello Paul,

I think you misunderstood me, I didn't mean R in the part number, but R in the middle of the first line of the marking.

0 Paul Grohe over 1 year ago in reply to Icgoo Icgoo

TI__Guru 53946 points

Hello Icgoo,

Apologies for the confusion. I see it now.

The ink-stamped "R" usually means that the device was re-screened or re-tested.

In this case, these devices were 100% X-Ray re-screened for seal voids per GIDEP CE9-P-23-01A. This was done for pretty much all CDIP-8 devices within a date code range and not just specific to the LM193.

GIDEP's can be retrieved from this site (requires registration):

https://www.gidep.org/products/database.htm

Amplifiers

Amplifiers forum

LM193QML: Can you suggest the meaning of "R" which is the marking of LM193AJRQMLV