C canadaelk Active Member Mar 9, 2013 #2 Not seeing your circuit: no! Digi-Key has a variety of the 74121 in stock. E
crutschow Well-Known Member Most Helpful Member Mar 9, 2013 #3 A 74221 is a dual monostable. Not knowing what your requirements are, I can't say whether it will replace the 74121.
A 74221 is a dual monostable. Not knowing what your requirements are, I can't say whether it will replace the 74121.