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==Integrated circuits== The integrated circuit designation consists of three letters, followed by a serial number of three to five digits.<ref name="D15/2010-07"/> Initially, only three-digit serial numbers were allowed. For designations with a three-digit serial number the third initial letter had a defined meaning for digital integrated circuits (see below) and the operating temperature range was encoded in the last digit of the serial number.<ref name=siemens/> The specification was changed in 1973<ref name=siemens/> to allow longer serial numbers. For designations with a serial number of more than three digits the third initial letter encodes the temperature range.<ref name="D15/2010-07"/><ref name=siemens/> Optionally, a version letter (A, B, ...) and / or a package designation can follow after the serial number.<ref name="D15/2010-07"/> {|class="wikitable" |- !1st letter !Usage !Example |- |F, G, H, I |Digital integrated circuit that is part of a family |[[:Commons:File:FLH101.jpg|'''F'''LH101]] |- |M |[[Microprocessor]] |[[Signetics 2650#Second sources|'''M'''AB2650A]] |- |N |[[Charge-transfer device]]s and [[switched capacitor]]s |- |P |Digital integrated circuit that is part of a family |[[:Commons:File:AEG Mobile Communication E-Plus PT-10 - subboard - Siemens PMB2205-0380.jpg|'''P'''MB2205]] |- |S |Digital integrated circuit that is not part of a family ("solitary") |[[Philips SAA1099|'''S'''AA1099]] |- |T |Analogue integrated circuit |[[TEA1002|'''T'''EA1002]] |- |U |[[Mixed-signal integrated circuit]] (analogue and digital) |'''U'''AA180 |} {| class="wikitable" |+Operating temperature ranges<ref name="D15/2010-07"/> |- !rowspan=2|Range !colspan=2|3-digit serial number) !colspan=2|serial number with more than 3 digits |- !3rd digit !Example !3rd letter !Example |- |No temperature range specified |0 |[[:Commons:File:Philips N4422 - board 1 - Philips TCA220-3076.jpg|TCA22'''0''']] |A |[[:Commons:File:Profitronic VCR7501VPS - controller board - Philips TDA5140A-93709.jpg|TD'''A'''5140A]] |- | {{0|0−}}0 °C to +70 °C |1 |[[:Commons:File:FLH241 01.jpg|FLH24'''1''']] |B |[[:Commons:File:1&1 NetXXL powered by FRITZ! - Infineon PSB 2115 F on mainboard-1828.jpg|PS'''B'''2115F]] |- | −55 °C to +125 °C |2 |TAA76'''2'''<ref name=siemens/> |C |HC'''C'''4012B<ref name=sgs4011/> |- | −10 °C to +85 °C |3 | |— |— |- | +15 °C to +55 °C |4 | |— |— |- | −25 °C to +70 °C |5 |[[:Commons:File:FLH185.jpg|FLH18'''5''']] |D |[[:Commons:File:Profitronic VCR7501VPS - controller board - Philips SAD1009P-93703.jpg|SA'''D'''1009P]] |- | −25 °C to +85 °C |— |— |E |TB'''E'''2335<ref name=siemens/> |- | −40 °C to +85 °C |6 |FJH10'''6'''<ref name=mullard/> |F |[[:Commons:File:DOV-1X - Philips HEF4011BP on printed circuit board-9798.jpg|HE'''F'''4011BP]] |} {| class="wikitable" |+Common package designations<ref name="D15/2010-07"/> |- !Package !Description !Example |- |E |[[Ball grid array]] (BGA) |[[:Commons:File:Siemens C25 - board - Infineon PMB2800E-2562.jpg|PMB2800'''E''']] |- |H |[[Quad Flat Package]] (QFP) |[[:Commons:File:Hauppauge Computer Works WinTV DVB-S - Philips SAA 7146A-9866.jpg|SAA7146A'''H''']] |- |N |[[Quad Flat Package]] (QFP) non leaded |[[:Commons:File:Hermstedt Leonardo SP-PCI - Siemens PEB 2086 N-8066.jpg|PEB2086'''N''']] |- |P |Plastic [[dual in-line package]] (DIP) |[[:Commons:File:Philips PCF8574P AZ2955.1 kn03503.jpeg|PCF8574'''P''']] |- |T |[[Small Outline Integrated Circuit|Small Outline Package]] (SOP) |[[:Commons:File:PCF8574AT.jpg|PCF8574A'''T''']] |} === 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.
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