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74HC138; 74HCT138

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General description

The 74HC138; 74HCT138 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL).



The 74HC138; 74HCT138 decoder accepts three binary weighted address inputs (A0, A1 and A3) and when enabled, provides 8 mutually exclusive active LOW outputs (Y0 to Y7).



The 74HC138; 74HCT138 features 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 74HC138; 74HCT138 to a 1-of-32 (5 lines to 32 lines) decoder with just four 74HC138; 74HCT138 ICs and one inverter.



The 74HC138; 74HCT138 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. Not used enable inputs must be permanently tied to their appropriate active HIGH- or LOW-state.



The 74HC138; 74HCT138 is identical to the 74HC238; 74HCT238 but has inverting outputs.

Features

  • Demultiplexing capability
  • Multiple input enable for easy expansion
  • Complies with JEDEC standard no. 7A
  • Ideal for memory chip select decoding
  • Active LOW mutually exclusive outputs
  • ESD protection:
    • HBM EIA/JESD22-A114-C exceeds 2000 V
    • MM EIA/JESD22-A115-A exceeds 200 V
  • Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel

Products/packages

Type numberNorth American Type numberOrdering code (12NC)Product statusPackagePackingMarkingChemical contentLeadfree conversion date
74HC138BQ74HC138BQ-G9352 737 78115Volume productionSOT763-1
(DHVQFN16)
Reel Pack, SMD, 7"Standard Marking74HC138BQ
Always Pb-free
74HC138D74HC138D9337 134 00652Volume productionSOT109-1
(SO16)
Bulk Pack, CECCStandard Marking74HC138D
week 12, 2005
74HC138D74HC138D-T9337 134 00653Volume productionSOT109-1
(SO16)
Reel Pack, SMD, 13", CECCStandard Marking74HC138D
week 12, 2005
74HC138DB74HC138DB9351 744 10112Volume productionSOT338-1
(SSOP16)
TubeStandard Marking74HC138DB
week 12, 2005
74HC138DB74HC138DB-T9351 744 10118Volume productionSOT338-1
(SSOP16)
Reel Pack, SMD, 13"Standard Marking74HC138DB
week 12, 2005
74HC138N74HC138N9336 692 90652Volume productionSOT38-4
(DIP16)
Bulk Pack, CECCStandard Marking74HC138N
Always Pb-free
74HC138PW74HC138PW9351 743 80112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking74HC138PW
week 10, 2005
74HC138PW74HC138PW-T9351 743 80118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking74HC138PW
week 10, 2005
74HC138U9338 243 20029Volume productionUncased dieUncased die74HC138U
week 18, 2005
74HCT138BQ74HCT138BQ-G9352 744 71115Volume productionSOT763-1
(DHVQFN16)
Reel Pack, SMD, 7"Standard Marking74HCT138BQ
Always Pb-free
74HCT138D74HCT138D9337 134 10652Volume productionSOT109-1
(SO16)
Bulk Pack, CECCStandard Marking74HCT138D
week 12, 2005
74HCT138D74HCT138D-T9337 134 10653Volume productionSOT109-1
(SO16)
Reel Pack, SMD, 13", CECCStandard Marking74HCT138D
week 12, 2005
74HCT138DB74HCT138DB9351 744 20112Volume productionSOT338-1
(SSOP16)
TubeStandard Marking74HCT138DB
week 12, 2005
74HCT138DB74HCT138DB-T9351 744 20118Volume productionSOT338-1
(SSOP16)
Reel Pack, SMD, 13"Standard Marking74HCT138DB
week 12, 2005
74HCT138N74HCT138N9336 699 20652Volume productionSOT38-4
(DIP16)
Bulk Pack, CECCStandard Marking74HCT138N
Always Pb-free
74HCT138PW74HCT138PW9351 873 20112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking74HCT138PW
week 10, 2005
74HCT138PW74HCT138PW-T9351 873 20118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking74HCT138PW
week 10, 2005

Pricing/ordering/availability

Type numberOrdering code(12NC)Indicative price/unit($)RegionDistributorIn stockInventory dateBuy onlineSamples
74HC138BQ9352 737  78115  0.2900      Order samples
74HC138D9337 134  00652  0.1900     not available
74HC138D9337 134  00653  0.1900      Order samples
74HC138DB9351 744  10112  0.1900      Order samples
74HC138DB9351 744  10118  0.1900      Order samples
74HC138N9336 692  90652  0.1900      Order samples
74HC138PW9351 743  80112  0.1900     not available
74HC138PW9351 743  80118  0.1900      Order samples
74HC138U9338 243  20029        Order samples
74HCT138BQ9352 744  71115  0.3200      Order samples
74HCT138D9337 134  10652  0.1900     not available
74HCT138D9337 134  10653  0.1900      Order samples
74HCT138DB9351 744  20112  0.2400      Order samples
74HCT138DB9351 744  20118  0.2400      Order samples
74HCT138N9336 699  20652  0.1900      Order samples
74HCT138PW9351 873  20112  0.1900      Order samples
74HCT138PW9351 873  20118  0.1900     not available

Block diagrams/pinning

Technical documents

Support Documents

HCT_USER_GUIDE; HC/T User Guide (1997-11-01)
75013486; Philips Logic Competitive Cross Reference Guide (2004-09-14)

Parametrics/similar products

Type numberPackageDescriptionPropagation Delay(ns)VoltageNo. of PinsPower Dissipation ConsiderationsLogic Switching LevelsOutput Drive Capability
74HC138BQSOT763-1
(DHVQFN16)
3-to-8 Line Decoder/Demultiplexer; Inverting 12@5V 2.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC138DSOT109-1
(SO16)
3-to-8 Line Decoder/Demultiplexer; Inverting 12@5V 2.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC138DBSOT338-1
(SSOP16)
3-to-8 Line Decoder/Demultiplexer; Inverting 12@5V 2.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC138NSOT38-4
(DIP16)
3-to-8 Line Decoder/Demultiplexer; Inverting 12@5V 2.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC138PWSOT403-1
(TSSOP16)
3-to-8 Line Decoder/Demultiplexer; Inverting 12@5V 2.0-6.0 V 16 Low Power or Battery Applications CMOS +/- 5.2 mA
74HC138UUncased die
3-to-8 Line Decoder/Demultiplexer; Inverting 15 5 Volts + 16 Low Power or Battery Applications CMOS Low
74HCT138BQSOT763-1
(DHVQFN16)
3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled 17 4.5-5.5 V 16 Low Power TTL +/- 4 mA
74HCT138DSOT109-1
(SO16)
3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled 17 4.5-5.5 V 16 Low Power TTL +/- 4 mA
74HCT138DBSOT338-1
(SSOP16)
3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled 17 4.5-5.5V 16 Low Power TTL +/- 4 mA
74HCT138NSOT38-4
(DIP16)
3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled 17 4.5-5.5V 16 Low Power TTL +/- 4 mA
74HCT138PWSOT403-1
(TSSOP16)
3-to-8 Line Decoder/Demultiplexer; Inverting; TTL Enabled 17 4.5-5.5V 16 Low Power TTL +/- 4 mA

Similar products

74HC138; 74HCT138 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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