Editing Pro Electron (section)

=== Digital logic families ===
The combination of first letter and second letter is assigned to a specific manufacturer.<ref name="D15/2010-07"/>

    FCH171
   //  \ \__ serial number (including temperature range)
  //    \___ H=gate ("Combinatorial circuit"), J=flip-flop, K=monostable, L=[[level shifter]], Q=[[RAM]], R=[[Read-only memory|ROM]], Y=miscellaneous etc.
 FC=[[Diode–transistor logic|DTL]] by [[Philips]]<ref name=sperimentare6905/> / [[Mullard]]<ref name=mullard/>
 FD=[[Dynamic logic (digital electronics)|dynamic]] [[PMOS logic|PMOS]] by [[Philips]]<ref name=sperimentare6905/> / [[Mullard]]<ref name=mullard/>
 FE=[[PMOS logic|PMOS]] by [[Philips]]<ref name=sperimentare6905/> / [[Mullard]]<ref name=mullard/>
 FH=[[Transistor–transistor logic|TTL]] by [[Philips]]<ref name=sperimentare6905/> ([[Transistor–transistor logic#History|SUHL II series]])
 FJ=[[Transistor–transistor logic|TTL]] by [[Philips]]<ref name=sperimentare6905/> / [[Mullard]]<ref name=mullard/> ([[7400 series]])
 FK=E<sup>2</sup>CL by [[Philips]]<ref name=sperimentare6905/>
 FL=[[Transistor–transistor logic|TTL]] by [[Siemens]] ([[7400 series]])<ref name=siemens73/>
 FN=[[Emitter-coupled logic|ECL]] by [[Telefunken]]<ref name=telefunken2/>
 FP=[[High Threshold Logic|HTL]] by [[Telefunken]]<ref name=telefunken2/><ref name=telefunken/>
 FQ=[[Diode–transistor logic|DTL]] by [[SGS-ATES]]<ref name=babani74/><ref name=sadchenkov2009/>
 FS=SECL by [[Telefunken]]<ref name=telefunken2/>
 FY=[[Emitter-coupled logic|ECL]] by [[Siemens]]<ref name=siemens73/>
 FZ=[[High Threshold Logic|HTL]] by [[Siemens]]<ref name=siemens73/>
 GD=[[PMOS logic|PMOS]] by [[Siemens]] (MEM1000 series)<ref name=sperimentare7301/>
 GH=[[Emitter-coupled logic|ECL]] by [[Philips]]<ref name=radioelettronica7303/>
 GJ=[[Transistor–transistor logic|TTL]] by [[Mullard]] ([[7400 series|74H00 series]])<ref name=mullard/>
 GR=interface devices by [[Mullard]] (7500 series)<ref name=mullard/>
 GT=[[Transistor–transistor logic|TTL]] by [[Mullard]] ([[7400 series|74S00 series]])<ref name=mullard/>

Unfortunately the serial number does not specify the same type of gate in each family, e.g. while an FJH131 is a quadruple 2-input [[NAND gate]] (like the [[7400 series|7400]]), an FCH131 is a dual 4-input NAND gate,<ref name=mullard/> and an FLH131 is an 8-input NAND gate (equivalent to 7430).<ref name=siemens73/> To lessen the confusion at least for the 7400 series, at some point manufacturers included the well-known 7400 series designation both in their literature and on the integrated circuits themselves.