Decoders/Encoders/Multiplexers - Decoders/Demultiplexers - SN74LS138

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Datasheet

3-Line To 8-Line Decoders/Demultiplexers (PDF 48790 KB)
01 Mar 1988

	SN54LS138	SN74LS138
Voltage Nodes(V)	5	5
Vcc range(V)	4.5 to 5.5	4.75 to 5.25
Input Level	TTL	TTL
Output Level	TTL	TTL
Output Drive(mA)		-0.4/8
Output	2S	2S
From	3	3
To	8	8
Rating	Military	Catalog
Technology Family	LS	LS
	Samples	Samples
	Inventory	Inventory

Other qualified versions of SN74LS138

Version	Part Number	Definition
Military	SN54LS138	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

SN54LS138: 3-Line To 8-Line Decoders/Demultiplexers
SN74LS08: Quadruple 2-Input Positive-AND Gates
SN74LS02: Quad 2-input positive-NOR gates
SN74LS04: Hex inverters

Product Information

Features

Designed Specifically for High-Speed:
- Memory Decoders
- Data Transmission Systems
3 Enable Inputs to Simplify Cascading and/or Data Reception
Schottky-Clamped for High Performance

Description

These Schottky-clamped TTL MSI circuits are designed to be used in high-performance memory decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the Schottky-clamped system decoder is negligible.

The 'LS138, SN54S138, and SN74S138A decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs.

View All Description in Datasheet

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools	Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Footprints	Samples
SN74LS138D	ACTIVE	0 to 70	0.44 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74LS138DE4	ACTIVE	0 to 70	0.44 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74LS138DG4	ACTIVE	0 to 70	0.44 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74LS138DR	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Purchase Samples
SN74LS138DRE4	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Purchase Samples
SN74LS138DRG4	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Purchase Samples
SN74LS138N	ACTIVE	0 to 70	0.40 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
SN74LS138N3	OBSOLETE	0 to 70		PDIP (N) \| 16	View		Not Available
SN74LS138NE4	ACTIVE	0 to 70	0.40 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples
SN74LS138NSR	ACTIVE	0 to 70	0.40 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74LS138NSRE4	ACTIVE	0 to 70	0.40 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74LS138NSRG4	ACTIVE	0 to 70	0.40 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 10:59 AM GMT, 22 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 15 WeeksSN74LS138D
Americas	Arrow	>1k
	Newark	258
	Rochester Electronics	>1k
Asia	Farnell Asia	855
Europe	Arrow Southern Europe	40
	Avnet-SILICA	480
	EBV Elektronik	520
	Farnell	833
	Spoerle	560
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74LS138DE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74LS138DG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74LS138DR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Worldwide	DigiKey	19
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksSN74LS138DRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74LS138DRG4
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksSN74LS138N
Americas	Newark	>1k
Americas	Rochester Electronics	>1k
Europe	Abacus Polar	551
	Arrow Northern Europe	>1k
	Spoerle	>1k
Call**SN74LS138N3
Americas	Rochester Electronics	137
TI Lead Time*: 18 WeeksSN74LS138NE4
Americas	Avnet	>1k
TI Lead Time*: 15 WeeksSN74LS138NSR
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksSN74LS138NSRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksSN74LS138NSRG4
None Reported View Distributors
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
SN74LS138D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138DE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138DR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138DRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138DRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138N	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
SN74LS138NE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
SN74LS138NSR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138NSRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74LS138NSRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for SN74LS138

Datasheet

3-Line To 8-Line Decoders/Demultiplexers (PDF, 48790 KB)
01 Mar 1988

Application Notes

Input and Output Characteristics of Digital Integrated Circuits (HTM, 9 KB) 9367 views
01 Oct 1996 Read Abstract
Live Insertion (HTM, 8 KB) 2440 views
01 Oct 1996 Read Abstract
TI IBIS File Creation, Validation, and Distribution Processes (HTM, 9 KB) 3902 views
29 Aug 2002 Read Abstract
Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 27231 views
24 May 2004 Read Abstract
Designing with the SN54/74LS123 (Rev. A) (HTM, 9 KB) 3058 views
01 Mar 1997 Read Abstract
Designing With Logic (Rev. C) (HTM, 8 KB) 9152 views
01 Jun 1997 Read Abstract
Understanding and Interpreting Standard-Logic Data Sheets (Rev. B) (HTM, 8 KB) 21673 views
28 May 2003 Read Abstract

View Application Notes for Decoders/Demultiplexers

User Guides

LOGIC Pocket Data Book (Rev. B) (PDF, 6001 KB) 47290 views
16 Jan 2007

Selection Guides

Logic Guide 2009 (Rev. Z) (PDF, 4263 KB) 90505 views
23 Jul 2009

More Literature

Logic Cross-Reference (Rev. A) (PDF, 2938 KB) 15408 views
07 Oct 2003

Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
SN54LS138	3-Line To 8-Line Decoders/Demultiplexers	DECODERS/ENCODERS/MULTIPLEXERS-DECODERS/DEMULTIPLEXERS	TI customers also evaluated this product.
SN74LS08	Quadruple 2-Input Positive-AND Gates	GATES-AND GATES	TI customers also evaluated this product.
SN74LS02	Quad 2-input positive-NOR gates	GATES-NOR GATES	TI customers also evaluated this product.
SN74LS04	Hex inverters	BUFFERS, DRIVERS AND TRANSCEIVERS-INVERTING BUFFERS AND DRIVERS	TI customers also evaluated this product.
SN74LS10	Triple 3-input positive-NAND gates	GATES-NAND GATES	TI customers also evaluated this product.
TPS54331	3A, 28V Input, 570 kHz Step Down SWIFT™ DC/DC Converter with Eco-mode ™	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
SN74LS14	Hex schmitt-trigger inverters	BUFFERS, DRIVERS AND TRANSCEIVERS-INVERTING BUFFERS AND DRIVERS	TI customers also evaluated this product.
SN74AVC8T245	8-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs	VOLTAGE LEVEL TRANSLATION-DUAL SUPPLY TRANSLATORS	TI customers also evaluated this product.
UCC28070	Two-Phase Interleaved CCM PFC Controller	AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS	TI customers also evaluated this product.
TPS76801	Single Output LDO, 1.0A, Adj.(1.5 to 5.5V), Low Quiescent Current, Fast Transient Response	LINEAR REGULATORS-SINGLE CHANNEL LDO	TI customers also evaluated this product.

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SN74LS138 Status: ACTIVE

3-line to 8-line decoder / demultiplexer

Most Popular Links

Datasheet

Other qualified versions of SN74LS138

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

User Guides

Selection Guides

More Literature

Support and Community

Customer Tags

Other Support

SN74LS138 Status: ACTIVE

3-line to 8-line decoder / demultiplexer

Most Popular Links

Datasheet

Other qualified versions of SN74LS138

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

User Guides

Selection Guides

More Literature

Related Products

Support and Community

Customer Tags

Other Support