SN74LVC1G123: Problems with part, device marking not specified in datasheet.

Mark Bolduan

Part Number: SN74LVC1G123
Other Parts Discussed in Thread: SN74LVC2G74-EP,

Tool/software:

We have problems with the SN74LVC1G123DCK (monostable multivibrator) on some boards. The part is used in the circuit to generate a low pulse of a certain length. 
The input signals at the problematic parts are correct, but the low pulse is not generated. 

It was noticed that the device marking on the problematic component “CHB” is not given in the data sheet. 
Other non-problematic modules have the valid device marking “C23R”. 

Is “CHB” still a valid device marking, or may the wrong part have been populated on the board?

3 months ago

0 Ian Graham 3 months ago

TI__Expert 6361 points

Hi Mark,

Could you supply the tracking slip for this part showing the part number? I don't think TI makes a SN74LVC1G123DCK. Was this part purchased from an authorized distributor?

Best,

Ian

0 Clemens Ladisch 3 months ago in reply to Ian Graham

Guru 295240 points

"C23R" is the marking for the DCU package. "CHB" is the marking for the SN74LVC2G74-EP in the DCU package.

0 Ian Graham 3 months ago in reply to Clemens Ladisch

TI__Expert 6361 points

Thanks Clemens.

Mark, is it possible the SN74LVC1G123 got mixed up with a different part? If possible, please send the package slip for the SN74LVC1G123 parts.

Best,

Ian

0 Mark Bolduan 3 months ago in reply to Ian Graham

Prodigy 30 points

Hi Ian,

thanks for your answer!

that could certainly be possible. We have the boards manufactured externally. The reels may have been mixed up when setting up the placement machine.

Best regards

Mark

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SN74LVC1G123: Problems with part, device marking not specified in datasheet.