Octal D-type flip-flop with reset; positive-edge trigger

The 74AHC273; 74AHCT273 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard No. 7-A.

The 74AHC273; 74AHCT273 has eight edge-triggered, D-type flip-flops with individual D inputs and Q outputs.

The common clock (CP) and master reset (MR) inputs, load and reset (clear) all flip-flops simultaneously.

The state of each D input, one set-up time before the LOW-to-HIGH clock transition, is transferred to the corresponding output (Qn) of the flip-flop.

All outputs will be forced LOW, independent of clock or data inputs, by a LOW on the MR input.

The device is useful for applications where only the true output is required and the clock and master reset are common to all storage elements.


  • Balanced propagation delays
  • All inputs have Schmitt-trigger actions
  • Inputs accept voltages higher than VCC
  • Ideal buffer for MOS microcontroller or memory
  • Common clock and master reset
  • Related product versions:
    • 74AHC377; 74AHCT377 for clock enable version
    • 74AHC373; 74AHCT373 for transparent latch version
    • 74AHC374; 74AHCT374 for 3-state version
  • Input levels:
    • For 74AHC273: CMOS level
    • For 74AHCT273: TTL level
  • ESD protection:
    • HBM EIA/JESD22-A114E exceeds 2000 V
    • MM EIA/JESD22-A115-A exceeds 200 V
    • CDM EIA/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
74AHC273BQProduction2.0 - 5.5CMOS± 84.2165low-40~125789.150DHVQFN20
74AHC273DProduction2.0 - 5.5CMOS± 84.2165low-40~1258527.361SO20
74AHC273PWProduction2.0 - 5.5CMOS± 84.2165low-40~1251004.644.7TSSOP20
74AHCT273BQProduction4.5 - 5.5TTL± 84.0120low-40~125789.150DHVQFN20
74AHCT273DProduction4.5 - 5.5TTL± 84.0120low-40~1258527.361SO20
74AHCT273PWProduction4.5 - 5.5TTL± 84.0120low-40~1251004.644.7TSSOP20


Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT764-1Reel 7" Q1/T1ActiveAHC27374AHC273BQ,115
( 9352 730 49115 )
SOT163-1Reel 13" Q1/T1Active74AHC273D74AHC273D,118
( 9352 635 92118 )
Bulk PackActive74AHC273D74AHC273D,112
( 9352 635 92112 )
Reel 13" Q1/T1ActiveAHC27374AHC273PW,118
( 9352 635 93118 )
Bulk PackActiveAHC27374AHC273PW,112
( 9352 635 93112 )
SOT764-1Reel 7" Q1/T1ActiveAHCT27374AHCT273BQ,115
( 9352 737 35115 )
SOT163-1Reel 13" Q1/T1Active74AHCT273D74AHCT273D,118
( 9352 635 90118 )
Reel 13" Q1/T1ActiveAHCT27374AHCT273PW,118
( 9352 635 91118 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments

      Quality, reliability & chemical content

      Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
      74AHC273BQ74AHC273BQ,11574AHC273BQAlways Pb-free84.96.621.51E811
      74AHC273D74AHC273D,11874AHC273Dweek 30, 200484.96.621.51E811
      74AHC273D74AHC273D,11274AHC273Dweek 30, 200484.96.621.51E811
      74AHC273PW74AHC273PW,11874AHC273PWweek 5, 200584.96.621.51E811
      74AHC273PW74AHC273PW,11274AHC273PWweek 5, 200584.96.621.51E811
      74AHCT273BQ74AHCT273BQ,11574AHCT273BQAlways Pb-free84.96.621.51E811
      74AHCT273D74AHCT273D,11874AHCT273Dweek 30, 200484.96.621.51E811
      74AHCT273PW74AHCT273PW,11874AHCT273PWweek 7, 200584.96.621.51E811
      Quality and reliability disclaimer

      Documentation (13)

      File nameTitleTypeDate
      74AHC_AHCT273Octal D-type flip-flop with reset; positive-edge triggerData sheet2017-07-20
      ahct273ahct273 IBIS modelIBIS model2013-04-07
      ahc273ahc273 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
      ahct273ahct273 IBIS modelIBIS model2013-04-07
      ahc273ahc273 IBIS modelIBIS model2013-04-07


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