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74HC251; 74HCT251

8-input multiplexer; 3-state

The 74HC251; 74HCT251 is an 8-bit multiplexer with eight binary inputs (I0 to I7), three select inputs (S0 to S2) and an output enable input (OE). The select inputs select one of the eight binary inputs and route it to the complementary outputs (Y and Y). A HIGH on OE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • Wide supply voltage range from 2.0 V to 6.0 V

  • CMOS low power dissipation

  • High noise immunity

  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

  • Complies with JEDEC standards:

    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)

  • Input levels:

    • For 74HC251: CMOS level

    • For 74HCT251: TTL level

  • Non-inverting data path

  • ESD protection:

    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V

  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Parametrics

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
74HC251DProduction2.0 - 6.0CMOS± 5.218low-40~125804.138SO16
74HC251PWProduction2.0 - 6.0CMOS± 5.218low-40~1251142.041.9TSSOP16
74HCT251DProduction4.5 - 5.5TTL± 422low-40~125804.138SO16
74HCT251PWProduction4.5 - 5.5TTL± 422low-40~1251142.041.9TSSOP16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC251D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_653Active74HC251D74HC251D,653
( 9337 135 20653 )
74HC251PW
TSSOP16
(SOT403-1) 		SOT403-1SSOP-TSSOP-VSO-WAVE
SOT403-1_118ActiveHC25174HC251PW,118
( 9351 883 90118 )
74HCT251D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_653Active74HCT251D74HCT251D,653
( 9337 135 30653 )
74HCT251PW
TSSOP16
(SOT403-1) 		SOT403-1SSOP-TSSOP-VSO-WAVE
SOT403-1_118ActiveHCT25174HCT251PW,118
( 9351 883 80118 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HCT251D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_652Withdrawn / End-of-life74HCT251D74HCT251D,652
( 9337 135 30652 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC251D9337135206522021-12-312022-06-3074HC251D
    74HC251PW9351883901122021-12-312022-06-3074HC251PW
      74HCT251D9337135306522021-12-312022-06-3074HCT251D
        74HCT251PW9351883801122021-12-312022-06-3074HCT251PW

          Environmental information

          Type numberOrderable part numberChemical contentRoHSRHF-indicatorLeadfree conversion date
          74HC251D74HC251D,65374HC251Dweek 6, 2004
          74HC251PW74HC251PW,11874HC251PWweek 10, 2005
          74HCT251D74HCT251D,65374HCT251Dweek 6, 2004
          74HCT251PW74HCT251PW,11874HCT251PWweek 10, 2005

          The variants in the table below are discontinued. See the table Discontinuation information for more information.

          Type numberOrderable part numberChemical contentRoHSRHF-indicatorLeadfree conversion date
          74HCT251D74HCT251D,65274HCT251Dweek 6, 2004
          Quality and reliability disclaimer

          Documentation (9)

          File nameTitleTypeDate
          74HC_HCT2518-input multiplexer; 3-stateData sheet2024-03-14
          AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
          HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
          SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
          SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
          WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
          SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2023-11-07
          SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm bodyPackage information2023-11-08
          SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08

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