SN74LV4T125: Replacement solution

Mike Yu

Intellectual 1830 points

Part Number: SN74LV4T125
Other Parts Discussed in Thread: SN74AHCT125

Hi Team,

Due to the shortage on SN74LV4T125RGYR, can we replace it with SN74LV125ARGYRG4? Thank you.

Best regards,

Mike

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 243820 points

The LV device has different switching thresholds (it is not a low-to-high level shifter).

0 Mike Yu over 2 years ago in reply to Clemens Ladisch

TI__Intellectual 1830 points

Hi Clemens,

I see both SN74LV4T125RGYR and SN74LV125ARGYRG4 are LV family. Do you mean the different between them is that SN74LV125ARGYRG4 didn't have the low-to-high level shift voltage function? Thank you.

Best regards,

Mike

0 Clemens Ladisch over 2 years ago in reply to Mike Yu

Guru 243820 points

The SN74LV4T125 does not belong in the LV family (the web site is wrong). The LV1T/LV4T devices have different electrical characteristics, which are similar to AHCT with an extended supply voltage range.

For high-to-low shifting, you can use any 74xx125 device with overvoltage-tolerant inputs. For low-to-high shifting from 3.3 V to 5 V, you can use the SN74AHCT125. For low-to-high shifting at other voltages, there is no replacement.

0 Mike Yu over 2 years ago in reply to Clemens Ladisch

TI__Intellectual 1830 points

Hi Clemens,

Get it, so can I regards that if the customer application is high-to-low voltage shifting, then they can use SN74LV125ARGYRG4 to replace SN74LV4T125RGYR.
For low-to-high shifting from 3.3 V to 5 V application, they can only use the SN74LV4T125RGYR.

Best regards,

Mike

0 Dylan Hubbard over 2 years ago in reply to Mike Yu

TI__Mastermind 42640 points

Hey Mike,

If its 3.3 V to 5 V they could also use SN74AHCT125 supplied at 5 V.

0 Mike Yu over 2 years ago in reply to Dylan Hubbard

TI__Intellectual 1830 points

Hi Dylan,

Get it, it is clear to me. Thank you.

Best regards,

Logic

Logic forum

SN74LV4T125: Replacement solution