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74HC138; 74HCT138

3-to-8 line decoder/demultiplexer; inverting

The 74HC138; 74HCT138 decodes three binary weighted address inputs (A0, A1 and A2) to eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1, E2 and E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion to a 1-of-32 (5 to 32 lines) decoder with just four '138 ICs and one inverter. The '138 can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes. Inputs include clamp diodes. This enables 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 to 6.0 V
  • CMOS low power dissipation
  • High noise immunity
  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
  • Demultiplexing capability
  • Multiple input enable for easy expansion
  • Ideal for memory chip select decoding
  • Active LOW mutually exclusive outputs
  • Input levels:
    • For 74HC138: CMOS level
    • For 74HCT138: TTL level
  • Complies with JEDEC standards:
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Multiple package options
  • 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
74HC138BQProduction2.0 - 6.0CMOS± 5.212low-40~1259314.363DHVQFN16
74HC138DProduction2.0 - 6.0CMOS± 5.212low-40~1259310.053SO16
74HC138PWProduction2.0 - 6.0CMOS± 5.212low-40~1251254.755.5TSSOP16
74HCT138BQProduction4.5 - 5.5TTL± 419low-40~1259314.363DHVQFN16
74HCT138DProduction4.5 - 5.5TTL± 419low-40~1259310.053SO16
74HCT138PWProduction4.5 - 5.5TTL± 419low-40~1251254.755.5TSSOP16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC138BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHC13874HC138BQ,115
( 9352 737 78115 )
74HC138D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC138D74HC138D,653
( 9337 134 00653 )
74HC138PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC13874HC138PW,118
( 9351 743 80118 )
74HCT138BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHCT13874HCT138BQ,115
( 9352 744 71115 )
74HCT138D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HCT138D74HCT138D,653
( 9337 134 10653 )
74HCT138PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT13874HCT138PW,118
( 9351 873 20118 )

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))
74HC138D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HC138D74HC138D,652
( 9337 134 00652 )
74HC138PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHC13874HC138PW,112
( 9351 743 80112 )
74HCT138D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HCT138D74HCT138D,652
( 9337 134 10652 )
74HCT138PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHCT13874HCT138PW,112
( 9351 873 20112 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC138D9337134006522021-12-312022-06-3074HC138D
    74HC138PW9351743801122021-12-312022-06-3074HC138PW
      74HCT138D9337134106522021-12-312022-06-3074HCT138D
        74HCT138PW9351873201122021-12-312022-06-3074HCT138PW

          Quality, reliability & chemical content

          Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
          74HC138BQ74HC138BQ,11574HC138BQAlways Pb-free29.90.91.11E911
          74HC138D74HC138D,65374HC138Dweek 12, 200529.90.91.11E911
          74HC138PW74HC138PW,11874HC138PWweek 10, 200529.90.91.11E911
          74HCT138BQ74HCT138BQ,11574HCT138BQAlways Pb-free29.90.91.11E911
          74HCT138D74HCT138D,65374HCT138Dweek 12, 200529.90.91.11E911
          74HCT138PW74HCT138PW,11874HCT138PWweek 10, 200529.90.91.11E911

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

          Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
          74HC138D74HC138D,65274HC138Dweek 12, 200529.90.91.11E911
          74HC138PW74HC138PW,11274HC138PWweek 10, 200529.90.91.11E911
          74HCT138D74HCT138D,65274HCT138Dweek 12, 200529.90.91.11E911
          74HCT138PW74HCT138PW,11274HCT138PWweek 10, 200529.90.91.11E911
          Quality and reliability disclaimer

          Documentation (11)

          File nameTitleTypeDate
          74HC_HCT1383-to-8 line decoder/demultiplexer; invertingData sheet2021-08-13
          AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
          hchc Spice modelSPICE model2013-05-06
          HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
          SOT763-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 1 mm bodyPackage information2020-04-21
          SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
          SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
          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
          WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
          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

          Support

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          Models

          File nameTitleTypeDate
          hchc Spice modelSPICE model2013-05-06

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