×

74HC238; 74HCT238

3-to-8 line decoder/demultiplexer

The 74HC238; 74HCT238 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 and E2 and E3). Every output will be LOW 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 '238 ICs and one inverter. The '238 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
  • Demultiplexing capability
  • Multiple input enable for easy expansion
  • Ideal for memory chip select decoding
  • Active HIGH mutually exclusive outputs
  • Input levels:
    • For 74HC238: CMOS level
    • For 74HCT238: TTL level
  • Complies with JEDEC standards
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
  • 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
74HC238BQProduction2.0 - 6.0CMOS± 5.214low-40~1259414.463DHVQFN16
74HC238DProduction2.0 - 6.0CMOS± 5.214low-40~1259310.053SO16
74HC238PWProduction2.0 - 6.0CMOS± 5.214low-40~1251264.855.6TSSOP16
74HCT238BQProduction4.5 - 5.5TTL± 418low-40~1259414.463DHVQFN16
74HCT238DProduction4.5 - 5.5TTL± 418low-40~1259310.053SO16
74HCT238PWProduction4.5 - 5.5TTL± 418low-40~1251264.855.6TSSOP16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC238BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHC23874HC238BQ,115
( 9352 836 81115 )
74HC238D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC238D74HC238D,653
( 9337 146 40653 )
74HC238PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC23874HC238PW,118
( 9351 890 00118 )
74HCT238BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHCT23874HCT238BQ,115
( 9352 836 82115 )
74HCT238D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HCT238D74HCT238D,653
( 9337 151 20653 )
74HCT238PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT23874HCT238PW,118
( 9351 895 60118 )

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))
74HC238D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HC238D74HC238D,652
( 9337 146 40652 )
74HC238PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHC23874HC238PW,112
( 9351 890 00112 )
74HCT238D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HCT238D74HCT238D,652
( 9337 151 20652 )
74HCT238PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHCT23874HCT238PW,112
( 9351 895 60112 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC238D9337146406522021-12-312022-06-3074HC238D
    74HC238PW9351890001122021-12-312022-06-3074HC238PW
      74HCT238D9337151206522021-12-312022-06-3074HCT238D
        74HCT238PW9351895601122021-12-312022-06-3074HCT238PW

          Quality, reliability & chemical content

          Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
          74HC238BQ74HC238BQ,11574HC238BQAlways Pb-free29.90.91.11E911
          74HC238D74HC238D,65374HC238Dweek 12, 200529.90.91.11E911
          74HC238PW74HC238PW,11874HC238PWweek 10, 200529.90.91.11E911
          74HCT238BQ74HCT238BQ,11574HCT238BQAlways Pb-free29.90.91.11E911
          74HCT238D74HCT238D,65374HCT238Dweek 6, 200429.90.91.11E911
          74HCT238PW74HCT238PW,11874HCT238PWweek 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
          74HC238D74HC238D,65274HC238Dweek 12, 200529.90.91.11E911
          74HC238PW74HC238PW,11274HC238PWweek 10, 200529.90.91.11E911
          74HCT238D74HCT238D,65274HCT238Dweek 6, 200429.90.91.11E911
          74HCT238PW74HCT238PW,11274HCT238PWweek 10, 200529.90.91.11E911
          Quality and reliability disclaimer

          Documentation (10)

          File nameTitleTypeDate
          74HC_HCT2383-to-8 line decoder/demultiplexerData sheet2021-09-02
          AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
          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

          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.

          Sample

          As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store: https://extranet.nexperia.com.

          Sample orders normally take 2-4 days for delivery.

          If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples.