UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Mark1960 · 8th Apr 2021, 9:42 pm

I just checked on my MK14 and the date codes are /831 on the DM74S571Ns, /845 on the INS8060N, /847 on INS8154N, /821 on DM7445N, 7845 on DM74LS178N, 839 on DM74LS157J, -833 on DM80L95N, -816 on DM7408N, -831 on DM74LS04N, -841 on DM74LS00N, -840 on DM74LS08N.

I think the variation will be from different manufacturing sources not always following the letter of the spec.

8th Apr 2021, 9:42 pm	#4
Mark1960 Octode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 1,298	Re: National Semiconductor IC batch codes I just checked on my MK14 and the date codes are /831 on the DM74S571Ns, /845 on the INS8060N, /847 on INS8154N, /821 on DM7445N, 7845 on DM74LS178N, 839 on DM74LS157J, -833 on DM80L95N, -816 on DM7408N, -831 on DM74LS04N, -841 on DM74LS00N, -840 on DM74LS08N. I think the variation will be from different manufacturing sources not always following the letter of the spec.