74HC138-Q100; 74HCT138-Q100

3-to-8 line decoder/demultiplexer; inverting

The 74HC138-Q100; 74HCT138-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, 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.

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
  • 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-Q100: CMOS level
    • For 74HCT138-Q100: TTL level
  • Complies with JEDEC standards:
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • 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)
  • Multiple package options
  • 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
74HC138BQ-Q100Production2.0 - 6.0CMOS± 5.212low-40~1259314.363DHVQFN16
74HC138D-Q100Production2.0 - 6.0CMOS± 5.212low-40~1259310.053SO16
74HC138PW-Q100Production2.0 - 6.0CMOS± 5.212low-40~1251254.755.5TSSOP16
74HCT138BQ-Q100Production4.5 - 5.5TTL± 419low-40~1259314.363DHVQFN16
74HCT138D-Q100Production4.5 - 5.5TTL± 419low-40~1259310.053SO16
74HCT138PW-Q100Production4.5 - 5.5TTL± 419low-40~1251254.755.5TSSOP16


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHC13874HC138BQ-Q100,115
( 9352 987 42115 )
Reel 13" Q1/T1Active74HC138D74HC138D-Q100,118
( 9352 987 43118 )
Reel 13" Q1/T1ActiveHC13874HC138PW-Q100,118
( 9352 987 44118 )
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHCT13874HCT138BQ-Q100,11
( 9352 987 45115 )
Reel 13" Q1/T1Active74HCT138D74HCT138D-Q100,118
( 9352 987 46118 )
Reel 13" Q1/T1ActiveHCT13874HCT138PW-Q100,11
( 9352 987 47118 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC138BQ-Q10074HC138BQ-Q100,11574HC138BQ-Q100Always Pb-free29.90.91.11E911
74HC138D-Q10074HC138D-Q100,11874HC138D-Q100Always Pb-free29.90.91.11E911
74HC138PW-Q10074HC138PW-Q100,11874HC138PW-Q100Always Pb-free29.90.91.11E911
74HCT138BQ-Q10074HCT138BQ-Q100,1174HCT138BQ-Q100Always Pb-free29.90.91.11E911
74HCT138D-Q10074HCT138D-Q100,11874HCT138D-Q100Always Pb-free29.90.91.11E911
74HCT138PW-Q10074HCT138PW-Q100,1174HCT138PW-Q100Always Pb-free29.90.91.11E911
Quality and reliability disclaimer

Documentation (8)

File nameTitleTypeDate
74HC_HCT138_Q1003-to-8 line decoder/demultiplexer; invertingData sheet2021-08-13
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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