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74AHC138D ECAD models PCB Symbol, Footprint & ECAD Model

3-to-8 line decoder/demultiplexer; inverting

The 74AHC138; 74AHCT138 are high-speed Si-gate CMOS devices and are pin compatible with Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard No. 7A.

The 74AHC138; 74AHCT138 is a 3-to-8 line decoder/demultiplexer. It accepts three binary weighted address inputs (A0, A1 and A2) and, when enabled, provides eight mutually exclusive outputs (Y0 to Y7) that are LOW when selected.

There are three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH.

This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four 74AHC138; 74AHCT138 devices and one inverter. The 74AHC138; 74AHCT138 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. Unused enable inputs must be permanently tied to their appropriate active HIGH or LOW state.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74AHC138D 74AHC138D,112 935262999112 SOT109-1 Order product
74AHC138D 74AHC138D,118 935262999118 SOT109-1 Order product

Features and benefits

  • Balanced propagation delays
  • All inputs have Schmitt-trigger action
  • Demultiplexing capability
  • Multiple input enable for easy expansion
  • Ideal for memory chip select decoding
  • Inputs accepts voltages higher than VCC
  • For 74AHC138 only: operates with CMOS input levels
  • For 74AHCT138 only: operates with TTL input levels
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
    • CDM JESD22-C101C exceeds 1000 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

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
74AHC138DProduction2.0 - 5.5CMOS± 84.4low-40~125939.752SO16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
74AHC138D74AHC138D,112
( 9352 629 99112 )
Active74AHC138D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack
74AHC138D,118
( 9352 629 99118 )
Active74AHC138DReel 13" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74AHC138D74AHC138D,11274AHC138D84.96.621.51E811
74AHC138D74AHC138D,11874AHC138D84.96.621.51E811
Quality and reliability disclaimer

Documentation (5)

File nameTitleTypeDate
74AHC_AHCT1383-to-8 line decoder/demultplexer; invertingData sheet2017-04-07
AN11106Pin FMEA for AHC/AHCT familyApplication note2019-01-09
ahc138ahc138 IBIS modelIBIS model2013-04-07
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08

Support

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Models

File nameTitleTypeDate
ahc138ahc138 IBIS modelIBIS model2013-04-07

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74AHC138D74AHC138D,112935262999112Bulk PackOrder product
74AHC138D74AHC138D,118935262999118Reel 13" Q1/T1Order product

Sample

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