74AHC257; 74AHCT257

Quad 2-input multiplexer; 3-state

The 74AHC257; 74AHCT257 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 74AHC257; 74AHCT257 has four identical 2-input multiplexers with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S). The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data inputs from source 1 (1I1 to 4I1) are selected when input S is HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs. The 74AHC257; 74AHCT257 is the logic implementation of a 4-pole 2-position switch, where the position of the switch is determined by the logic levels applied to input S. The outputs are forced to a high-impedance OFF-state when OE is HIGH.

The logic equations for the outputs are:

  • 1Y = OE x (1I1 x S + 1I0 x S)
  • 2Y = OE x (2I1 x S + 2I0 x S)
  • 3Y = OE x (3I1 x S + 3I0 x S)
  • 4Y = OE x (4I1 x S + 4I0 x S)

The 74AHC257; 74AHCT257 is identical to the 74AHC258; 74AHCT258, but has non-inverting (true) outputs.

Features and benefits

  • Balanced propagation delays
  • All inputs have Schmitt-trigger actions
  • Non-inverting data path
  • Inputs accept voltages higher than VCC
  • Input levels:
    • For 74AHC257: CMOS level
    • For 74AHCT257: 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 Cel to +85 Cel and from -40 Cel to +125 Cel


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74AHC257DProduction2.0 - 5.5CMOS± 82.9low-40~1259410.353SO16
74AHC257PWProduction2.0 - 5.5CMOS± 82.9low-40~1251264.956.3TSSOP16
74AHCT257DProduction4.5 - 5.5TTL± 83.7low-40~125939.752SO16
74AHCT257PWProduction4.5 - 5.5TTL± 83.7low-40~1251254.654.9TSSOP16


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Reel 13" Q1/T1Active74AHC257D74AHC257D,118
( 9352 654 67118 )
Bulk PackActive74AHC257D74AHC257D,112
( 9352 654 67112 )
Reel 13" Q1/T1ActiveAHC25774AHC257PW,118
( 9352 654 68118 )
Bulk PackActiveAHC25774AHC257PW,112
( 9352 654 68112 )
Reel 13" Q1/T1Active74AHCT257D74AHCT257D,118
( 9352 654 69118 )
Bulk PackActive74AHCT257D74AHCT257D,112
( 9352 654 69112 )
Reel 13" Q1/T1ActiveAHCT25774AHCT257PW,118
( 9352 654 70118 )

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
    74AHC257D74AHC257D,11874AHC257Dweek 35, 200484.96.621.51E811
    74AHC257D74AHC257D,11274AHC257Dweek 35, 200484.96.621.51E811
    74AHC257PW74AHC257PW,11874AHC257PWweek 10, 200584.96.621.51E811
    74AHC257PW74AHC257PW,11274AHC257PWweek 10, 200584.96.621.51E811
    74AHCT257D74AHCT257D,11874AHCT257Dweek 35, 200484.96.621.51E811
    74AHCT257D74AHCT257D,11274AHCT257Dweek 35, 200484.96.621.51E811
    74AHCT257PW74AHCT257PW,11874AHCT257PWweek 10, 200584.96.621.51E811
    Quality and reliability disclaimer

    Documentation (8)

    File nameTitleTypeDate
    74AHC_AHCT257Quad 2-input multiplexer; 3-stateData sheet2017-07-20
    ahct257ahct257 IBIS modelIBIS model2013-04-07
    ahc257ahc257 IBIS modelIBIS model2013-04-07
    SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2021-01-06
    SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
    SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
    SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
    SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyPackage information2020-04-21


    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
    ahct257ahct257 IBIS modelIBIS model2013-04-07
    ahc257ahc257 IBIS modelIBIS model2013-04-07

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