SNOAA35D April 2023 – December 2023 LM2901 , LM2901B , LM2901B-Q1 , LM2903 , LM2903-Q1 , LM2903B , LM2903B-Q1 , LM339 , LM339-N , LM393 , LM393-N , LM393B , LM397 , TL331 , TL331-Q1 , TL331B
While effort was made to make the new B devices drop-in compatible with the classic devices, there can be differences when operated outside of the data sheet specifications.
One major difference is the Section 3.7.1 behavior is inverted. The B version output can go high when both inputs are above VCM.
Because the new B design is slightly faster with lower typical offset voltages, it tends to be more sensitive to noise spikes, ringing and glitches that the older, slower classic design may have ignored. Marginal system designs with excessive ground noise, very noisy input signals, noisy supplies or poor supply bypassing may now show false or multiple triggers. TI recommends proper supply bypassing (100nF minimum) directly between the supply pins. Input signals should be filtered to minimize high frequency noise and transients.
Due to the internal smaller device geometry and tighter junction spacing, the newer B devices tend to be slightly more sensitive to negative input voltages (voltages below the GND pin) and negative supply transients. Please see Section 3.8 for more information to protect against negative inputs.