Octal D-type flip-flop; positive edge-trigger; 3-state

The 74AHC574; 74AHCT574 are high-speed Si-gate CMOS devices and are pin compatible with Low Power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74AHC574; 74AHCT574 are octal D-type flip-flops featuring separate D-type inputs for each flip-flop and 3-state outputs for bus oriented applications. A clock (CP) and an output enable (OE) input are common to all flip-flops.

The 8 flip-flops will store the state of their individual D-inputs that meet the set-up and hold times requirements on the LOW-to-HIGH CP transition.

When OE is LOW the contents of the 8 flip-flops are available at the outputs. When OE is HIGH, the outputs go to the high-impedance OFF-state. Operation of the OE input does not affect the state of the flip-flops.

The 74AHC574; 74AHCT574 is functionally identical to the 74AHC564; 74AHCT564, but has non-inverting outputs. The 74AHC574; 74AHCT574 is functionally identical to the 74AHC374; 74AHCT374, but has a different pinning.


  • Balanced propagation delays
  • All inputs have a Schmitt-trigger action
  • 3-state non-inverting outputs for bus orientated applications
  • 8-bit positive, edge-triggered register
  • Independent register and 3-state buffer operation
  • Common 3-state output enable input
  • For 74AHC574 only: operates with CMOS input levels
  • For 74AHCT574 only: operates with TTL input levels
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
    • CDM JESD22-C101C exceeds 1000 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)fmax (MHz)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74AHC574BQProduction2.0 - 5.5CMOS± 84.4130low-40~125778.148DHVQFN20
74AHC574DProduction2.0 - 5.5CMOS± 84.4130low-40~1258426.460SO20
74AHC574PWProduction2.0 - 5.5CMOS± 84.4130low-40~1251004.444TSSOP20
74AHCT574BQProduction4.5 - 5.5TTL± 84.4130low-40~125778.148DHVQFN20
74AHCT574DProduction4.5 - 5.5TTL± 84.4130low-40~1258426.460SO20
74AHCT574PWProduction4.5 - 5.5TTL± 84.4130low-40~1251004.444TSSOP20


Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT764-1Reel 7" Q1/T1ActiveAHC57474AHC574BQ,115
( 9352 855 46115 )
SOT163-1Reel 13" Q1/T1Active74AHC574D74AHC574D,118
( 9352 630 80118 )
Bulk PackActive74AHC574D74AHC574D,112
( 9352 630 80112 )
Reel 13" Q1/T1ActiveAHC57474AHC574PW,118
( 9352 630 81118 )
Bulk PackActiveAHC57474AHC574PW,112
( 9352 630 81112 )
SOT764-1Reel 7" Q1/T1ActiveAHCT57474AHCT574BQ,115
( 9352 855 49115 )
SOT163-1Reel 13" Q1/T1Active74AHCT574D74AHCT574D,118
( 9352 630 82118 )
Bulk PackActive74AHCT574D74AHCT574D,112
( 9352 630 82112 )
Reel 13" Q1/T1ActiveAHCT57474AHCT574PW,118
( 9352 630 83118 )
Bulk PackActiveAHCT57474AHCT574PW,112
( 9352 630 83112 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74AHC574BQ74AHC574BQ,11574AHC574BQAlways Pb-free84.96.621.51E811
74AHC574D74AHC574D,11874AHC574Dweek 30, 200484.96.621.51E811
74AHC574D74AHC574D,11274AHC574Dweek 30, 200484.96.621.51E811
74AHC574PW74AHC574PW,11874AHC574PWweek 5, 200584.96.621.51E811
74AHC574PW74AHC574PW,11274AHC574PWweek 5, 200584.96.621.51E811
74AHCT574BQ74AHCT574BQ,11574AHCT574BQAlways Pb-free84.96.621.51E811
74AHCT574D74AHCT574D,11874AHCT574Dweek 30, 200484.96.621.51E811
74AHCT574D74AHCT574D,11274AHCT574Dweek 30, 200484.96.621.51E811
74AHCT574PW74AHCT574PW,11874AHCT574PWweek 7, 200584.96.621.51E811
74AHCT574PW74AHCT574PW,11274AHCT574PWweek 7, 200584.96.621.51E811
Quality and reliability disclaimer

Documentation (13)

File nameTitleTypeDate
74AHC_AHCT574Octal D-type flip-flop; positive edge-trigger; 3-stateData sheet2017-07-20
ahc574ahc574 IBIS modelIBIS model2013-04-07
ahct574ahct574 IBIS modelIBIS model2013-04-07
nexperia_selection_guide_2019_201901Selection guide 2019. Discretes, Logic and MOSFETsSelection guide2018-12-12
SOT764-1_115DHVQFN20; Reel pack; SMD, 7" Q1/T1 Standard product orientation Orderable part number ending ,115 or X Ordering code (12NC) ending 115Packing2013-04-23
SOT764-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 20 terminals; 0.5 mm pitch; 4.5 mm x 2.5 mm x 1 mm bodyOutline drawing2018-11-14
SOT360-1_118TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-15
SOT360-1plastic, thin shrink small outline package; 20 leads; 0.65 mm pitch; 6.5 mm x 4.4 mm x 1.1 mm bodyOutline drawing2018-10-18
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT163-1_115Tape reel SMD; standard product orientation 12NC ending 115Packing2013-04-25
SOT163-1_118SO20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-15
SOT163-1_518SO20; Reel dry pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,518 or Y Ordering code (12NC) ending 518Packing2014-12-16
SOT163-1plastic, small outline package; 20 leads; 1.27 mm pitch; 12.8 mm x 7.5 mm x 2.65 mm bodyOutline drawing2018-10-18


If you are in need of design/technical support, let us know and fill in the answer form, we'll get back to you shortly.


File nameTitleTypeDate
ahc574ahc574 IBIS modelIBIS model2013-04-07
ahct574ahct574 IBIS modelIBIS model2013-04-07


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