74HC(T)238

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

  • Demultiplexing capability
  • Multiple input enable for easy expansion
  • Ideal for memory chip select decoding
  • Active HIGH mutually exclusive outputs
  • Multiple package options
  • Complies with JEDEC standard no. 7A
  • Input levels:
    • For 74HC238: CMOS level
    • For 74HCT238: TTL level
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 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
74HC238BQProduction2.0 - 6.0CMOS± 5.214low-40~1259414.463DHVQFN16
74HC238DProduction2.0 - 6.0CMOS± 5.214low-40~1259310.053SO16
74HC238DB
NRND
Not for design in2.0 - 6.0CMOS+/- 5.214low-40~12514842.0SSOP16
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
74HCT238DB
NRND
Not for design in4.5 - 5.5TTL+/- 418low-40~12514842.0SSOP16
74HCT238PWProduction4.5 - 5.5TTL± 418low-40~1251264.855.6TSSOP16

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC238BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7" Q1/T1ActiveHC23874HC238BQ,115
( 9352 836 81115 )
74HC238D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC238D74HC238D,653
( 9337 146 40653 )
Bulk Pack, CECCActive74HC238D74HC238D,652
( 9337 146 40652 )
74HC238DB
NRND

SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC23874HC238DB,118
( 9351 892 70118 )
Bulk PackActiveHC23874HC238DB,112
( 9351 892 70112 )
74HC238PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC23874HC238PW,118
( 9351 890 00118 )
Bulk PackActiveHC23874HC238PW,112
( 9351 890 00112 )
74HCT238BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7" Q1/T1ActiveHCT23874HCT238BQ,115
( 9352 836 82115 )
74HCT238D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HCT238D74HCT238D,653
( 9337 151 20653 )
Bulk Pack, CECCActive74HCT238D74HCT238D,652
( 9337 151 20652 )
74HCT238DB
NRND

SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT23874HCT238DB,118
( 9351 892 60118 )
Bulk PackActiveHCT23874HCT238DB,112
( 9351 892 60112 )
74HCT238PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT23874HCT238PW,118
( 9351 895 60118 )
Bulk PackActiveHCT23874HCT238PW,112
( 9351 895 60112 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC238BQ74HC238BQ,11574HC238BQAlways Pb-free84.96.621.51E811
74HC238D74HC238D,65374HC238Dweek 12, 200584.96.621.51E811
74HC238D74HC238D,65274HC238Dweek 12, 200584.96.621.51E811
74HC238DB
NRND
74HC238DB,11874HC238DBweek 13, 200511
74HC238DB
NRND
74HC238DB,11274HC238DBweek 13, 200511
74HC238PW74HC238PW,11874HC238PWweek 10, 200584.96.621.51E811
74HC238PW74HC238PW,11274HC238PWweek 10, 200584.96.621.51E811
74HCT238BQ74HCT238BQ,11574HCT238BQAlways Pb-free84.96.621.51E811
74HCT238D74HCT238D,65374HCT238Dweek 6, 200484.96.621.51E811
74HCT238D74HCT238D,65274HCT238Dweek 6, 200484.96.621.51E811
74HCT238DB
NRND
74HCT238DB,11874HCT238DBweek 12, 200511
74HCT238DB
NRND
74HCT238DB,11274HCT238DBweek 12, 200511
74HCT238PW74HCT238PW,11874HCT238PWweek 10, 200584.96.621.51E811
74HCT238PW74HCT238PW,11274HCT238PWweek 10, 200584.96.621.51E811
Quality and reliability disclaimer

Documentation (20)

File nameTitleTypeDate
74HC_HCT2383-to-8 line decoder/demultiplexerData sheet2018-06-13
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SOT763-1_115DHVQFN16; Reel pack, SMD, 7" Q1/T1 standard product orientation Orderable part number ending ,115 or X Ordering code (12NC) ending 115Packing2016-07-05
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 bodyOutline drawing2018-11-14
SOT109-1_431SO16; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-08-25
SOT109-1_118SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-24
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyOutline drawing2018-10-18
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT403-1_623TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 623 or HL; Ordering code (12NC) ending 623Packing2013-05-15
SOT403-1_118TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-08
SOT403-1_128TSSOP16; Reel pack; SMD, 13", Turned Q4/T2 180 deg product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128Packing2014-10-14
SOT403-1_653TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 653 or HL; Ordering code (12NC) ending 653Packing2013-05-15
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyOutline drawing2018-11-14
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT338-1_431SSOP16; Reel pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-10-05
SOT338-1plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm bodyOutline drawing2018-10-18
SSOP-TSSOP-VSO-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08

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