74HCT138BQ

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.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74HCT138BQ 74HCT138BQ,115 935274471115 SOT763-1 Order product

Features

  • Complies with JEDEC standard no. 7A
  • Input levels:
    • For 74HC138: CMOS level
    • For 74HCT138: TTL level
  • Demultiplexing capability
  • Multiple input enable for easy expansion
  • Ideal for memory chip select decoding
  • Active LOW mutually exclusive outputs
  • 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

Target applications

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
74HCT138BQProduction4.5 - 5.5TTL± 419low-40~1259314.363DHVQFN16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74HCT138BQ74HCT138BQ,115
( 9352 744 71115 )
ActiveHCT138
DHVQFN16
(SOT763-1)
SOT763-1Reel 7" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74HCT138BQ74HCT138BQ,11574HCT138BQ84.96.621.51E811
Quality and reliability disclaimer

Documentation (6)

File nameTitleTypeDate
74HC_HCT1383-to-8 line decoder/demultiplexer; invertingData sheet2018-03-26
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
hchc Spice modelSPICE model2013-05-06
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

Support

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Models

File nameTitleTypeDate
hchc Spice modelSPICE model2013-05-06

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74HCT138BQ74HCT138BQ,115935274471115Reel 7" Q1/T1Order product

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