MC74HC138A: 1-of-8 Decoder/Demultiplexer

The MC74HC138A is identical in pinout to the LS138. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. The HC138A decodes a three bit Address to one of eight active low outputs. This device features three Chip Select inputs, two active low and one active high to facilitate the demultiplexing, cascading, and chip selecting functions. The demultiplexing function is accomplished by using the Address inputs to select the desired device output; one of the Chip Selects is used as a data input while the other Chip Selects are held in their active states.

Features
  • Output Drive Capability: 10 LSTTL Loads
  • Outputs Directly Interface to CMOS, NMOS and TTL
  • Operating Voltage Range: 2.0 to 6.0 V
  • Low Input Current: 1.0 mA
  • High Noise Immunity Characteristic of CMOS Devices
  • In Compliance with the Requirements Defined by JEDEC Standard No. 7A
  • Chip Complexity: 100 FETs or 29 Equivalent Gates
  • Pb-Free Packages are Available*
Packages
Simulation Models (2)
Document TitleDocument ID/SizeRevisionRevision Date
IBIS Model for MC74HC138ADMC74HC138AD.IBS (6.0kB)0
IBIS Model for MC74HC138ANMC74HC138AN.IBS (6.0kB)0
Package Drawings (2)
Document TitleDocument ID/SizeRevision
SOIC 16 LEAD751B-05 (38.2kB)K
TSSOP-16948F-01 (41.7kB)B
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
1-of-8 Decoder/DemultiplexerMC74HC138A/D (136.0kB)12
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
MC74HC138ADGActivePb-free Halide freeSOIC-16751B-051Tube48$0.1457
MC74HC138ADR2GActivePb-free Halide freeSOIC-16751B-051Tape and Reel2500$0.1457
MC74HC138ADTR2GActivePb-free Halide freeTSSOP-16948F-011Tape and Reel2500$0.1457
NLV74HC138ADR2GActiveAEC Qualified PPAP Capable Pb-free Halide freeSOIC-16751B-051Tape and Reel2500$0.3267
NLV74HC138ADTR2GActiveAEC Qualified PPAP Capable Pb-free Halide freeTSSOP-16948F-011Tape and Reel2500$0.3267
Specifications
ProductChannelsVCC Min (V)VCC Max (V)tpd Max (ns)IO Max (mA)
MC74HC138ADG126195.2
MC74HC138ADR2G126195.2
MC74HC138ADTR2G126195.2
NLV74HC138ADR2G126274
NLV74HC138ADTR2G126274
1-of-8 Decoder/Demultiplexer (136.0kB) MC74HC138A
IBIS Model for MC74HC138AD MC74HC138A
IBIS Model for MC74HC138AN MC74HC138A
SOIC 16 LEAD MC14504B
TSSOP-16 MC14504B