74HC238-Q100; 74HCT238-Q100

3-to-8 line decoder/demultiplexer

The 74HC238-Q100; 74HCT238-Q100 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.

This product has been qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 1) and is suitable for use in automotive applications.

Features and benefits

  • Automotive product qualification in accordance with AEC-Q100 (Grade 1)
    • Specified from -40 °C to +85 °C and from -40 °C to +125 °C
  • 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:
    • MIL-STD-883, method 3015 exceeds 2000 V
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 Ω)
  • DHVQFN package with Side-Wettable Flanks enabling Automatic Optical Inspection (AOI) of solder joints


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
74HC238BQ-Q100Production2.0 - 6.0CMOS± 5.214low-40~1259414.463DHVQFN16
74HC238D-Q100Production2.0 - 6.0CMOS± 5.214low-40~1259310.053SO16
74HC238PW-Q100Production2.0 - 6.0CMOS± 5.214low-40~1251264.855.6TSSOP16
74HCT238BQ-Q100Production4.5 - 5.5TTL± 418low-40~1259414.463DHVQFN16
74HCT238D-Q100Production4.5 - 5.5TTL± 418low-40~1259310.053SO16
74HCT238PW-Q100Production4.5 - 5.5TTL± 418low-40~1251264.855.6TSSOP16


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHC23874HC238BQ-Q100X
( 9353 003 33115 )
Reel 13" Q1/T1Active74HC238D74HC238D-Q100J
( 9353 000 44118 )
Reel 13" Q1/T1ActiveHC23874HC238PW-Q100J
( 9353 000 45118 )
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHCT23874HCT238BQ-Q100X
( 9353 003 34115 )
Reel 13" Q1/T1Active74HCT238D74HCT238D-Q100J
( 9353 000 68118 )
Reel 13" Q1/T1ActiveHCT23874HCT238PW-Q100J
( 9353 000 69118 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC238BQ-Q10074HC238BQ-Q100X74HC238BQ-Q100Always Pb-free29.90.91.11E911
74HC238D-Q10074HC238D-Q100J74HC238D-Q100Always Pb-free29.90.91.11E911
74HC238PW-Q10074HC238PW-Q100J74HC238PW-Q100Always Pb-free29.90.91.11E911
74HCT238BQ-Q10074HCT238BQ-Q100X74HCT238BQ-Q100Always Pb-free29.90.91.11E911
74HCT238D-Q10074HCT238D-Q100J74HCT238D-Q100Always Pb-free29.90.91.11E911
74HCT238PW-Q10074HCT238PW-Q100J74HCT238PW-Q100Always Pb-free29.90.91.11E911
Quality and reliability disclaimer

Documentation (10)

File nameTitleTypeDate
74HC_HCT238_Q1003-to-8 line decoder/demultiplexerData sheet2020-04-03
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


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