Logic IC prefixes? - UK Vintage Radio Repair and Restoration Discussion Forum

mickm3for · 15th Jan 2019, 2:06 pm

Hi any one know the difference between the HCF4011 and the F4011 indeed is there a difference thanks for any help Mick

cmjones01 · 15th Jan 2019, 2:29 pm

No, there's no difference. The prefix, in this case, just indicates the manufacturer. The only exception is if the prefix is '74HC', which means the chip is made with a more modern, higher-speed semiconductor process, but doesn't have such a wide range of supply voltage.

The suffix can be significant, though: most 4000-series chips are suffixed 'BE', which is the normal variety. There exist some with the suffix 'UBE' which means they're unbuffered, so they typically operate more slowly, can't drive as much current from their outputs, but are preferable in some analogue-like applications such as oscillators.

Chris

mickm3for · 15th Jan 2019, 2:36 pm

thanks Mick

Herald1360 · 15th Jan 2019, 3:58 pm

For info.....

David G4EBT · 15th Jan 2019, 4:15 pm

A couple of snippets from the book 'Modern TTL Circuits Manual' (Modern in 1994 that is, when it was published by Nenes), by R.M.Marston might be of interest.

The information outlines the manufacturers' prefixes and suffixes, and the basic coding system that gives each I.C. its name.

Hope that of interest.

15th Jan 2019, 2:06 pm	#1
mickm3for Heptode Join Date: May 2015 Location: Chatham, Kent, UK. Posts: 964	Logic IC prefixes? Hi any one know the difference between the HCF4011 and the F4011 indeed is there a difference thanks for any help Mick

15th Jan 2019, 2:29 pm	#2
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,677	Re: Logic IC prefixes? No, there's no difference. The prefix, in this case, just indicates the manufacturer. The only exception is if the prefix is '74HC', which means the chip is made with a more modern, higher-speed semiconductor process, but doesn't have such a wide range of supply voltage. The suffix can be significant, though: most 4000-series chips are suffixed 'BE', which is the normal variety. There exist some with the suffix 'UBE' which means they're unbuffered, so they typically operate more slowly, can't drive as much current from their outputs, but are preferable in some analogue-like applications such as oscillators. Chris __________________ What's going on in the workshop? http://martin-jones.com/

15th Jan 2019, 2:36 pm	#3
mickm3for Heptode Join Date: May 2015 Location: Chatham, Kent, UK. Posts: 964	Re: Logic IC prefixes? thanks Mick

15th Jan 2019, 4:15 pm	#5
David G4EBT Dekatron Join Date: Feb 2003 Location: Cottingham, East Yorkshire, UK. Posts: 5,761	Re: Logic IC prefixes? A couple of snippets from the book 'Modern TTL Circuits Manual' (Modern in 1994 that is, when it was published by Nenes), by R.M.Marston might be of interest. The information outlines the manufacturers' prefixes and suffixes, and the basic coding system that gives each I.C. its name. Hope that of interest. Attached Thumbnails __________________ David. BVWS Member. G-QRP Club member 1339.