Decoders & Demultiplexers

The difference between decoders and demultiplexers is that demultiplexers select an output line. A decoder takes in inputs and uses those inputs to determine which of the 2N outputs lines is high.

Decoder:
digital circuit that converts an input binary code into a single numeric output
binary code input
only one output activated at a time
A decoder has:
N inputs
2N outputs
A decoder selects one of 2N outputs by decoding the binary value on the N inputs. The decoder generates all of the minterms of the N input variables. Exactly one output will be active for each combination of the inputs.
Demultiplexer (demux):
receives the output signals from the multiplexer and the receiver end it converts them back to the original form

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Description Price Logic Family Logic Function Demultiplexing Capability Number of Elements per Chip Number of Input Enables per Element Output Type Polarity Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS Stock No. 170-3561
Mfr. Part No.MC74HC138ADR2G
MYR0.405
Each (On a Reel of 2500)
units
74HC Decoder, Demultiplexer 1-of-8 1 3 3 State Inverting Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V
RS Stock No. 689-8709
Mfr. Part No.MC74HC138ADG
MYR1.47
Each (In a Pack of 5)
units
74HC Decoder, Demultiplexer 1-of-8 1 3 - Inverting Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V
RS Stock No. 709-2472
Mfr. Part No.SN74LS156N
MYR3.68
Each (In a Pack of 5)
units
LS Decoder, Demultiplexer 1-of-4, 1-of-8 1, 2 2 Open Collector Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V
RS Stock No. 923-2486
Mfr. Part No.SN74HC138N
MYR1.48
Each (In a Tube of 25)
units
HC Decoder, Demultiplexer 1-of-8 1 3 - Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V
RS Stock No. 144-9897
Mfr. Part No.SN74LS139AN
MYR2.84
Each (In a Tube of 25)
units
LS Decoder, Demultiplexer 1-of-4 2 1 - Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V
RS Stock No. 145-1076
Mfr. Part No.SN74LS145D
MYR4.09
Each (In a Tube of 40)
units
LS Decoder, Driver 1-of-10 1 0 Open Collector Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V
RS Stock No. 709-2655
Mfr. Part No.SN74LS155AN
MYR6.426
Each (In a Pack of 5)
units
LS Decoder, Demultiplexer 1-of-4, 1-of-8 1, 2 2 Push-Pull Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V
RS Stock No. 633-969
Mfr. Part No.CD74HCT42E
MYR4.91
Each
units
HCT Decoder, Demultiplexer 1-of-10 1 0 - Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V
RS Stock No. 526-921
Mfr. Part No.SN74HC139D
MYR1.33
Each (In a Tube of 40)
units
HC Decoder, Demultiplexer 1-of-4 2 1 - Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V
RS Stock No. 144-9997
Mfr. Part No.CD74HC238E
MYR2.091
Each (In a Tube of 25)
units
HC Decoder, Demultiplexer 1-of-8 1 3 - Non-Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V
RS Stock No. 663-2439
Mfr. Part No.SN74LS156D
MYR4.01
Each (In a Pack of 5)
units
LS Decoder, Demultiplexer 1-of-4, 1-of-8 1, 2 2 Open Collector Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V
RS Stock No. 184-4262
Mfr. Part No.MC14543BDG
MYR1.51
Each (In a Tube of 48)
units
4000 Decoder - 1 1 Single Ended Non-Inverting Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm +18 V
RS Stock No. 145-0025
Mfr. Part No.CD4555BE
MYR1.87
Each (In a Tube of 25)
units
4000 Decoder, Demultiplexer 1-of-4 2 1 - Non-Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V
RS Stock No. 145-5836
Mfr. Part No.74AC11138PW
MYR12.812
Each (In a Tube of 90)
units
AC Decoder, Demultiplexer 3-of-8 1 3 CMOS Inverting Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 5.5 V
RS Stock No. 162-7411
Mfr. Part No.SN74LS155AN
MYR4.77
Each (In a Tube of 25)
units
LS Decoder, Demultiplexer 1-of-4, 1-of-8 1, 2 2 Push-Pull Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V
RS Stock No. 663-2410
Mfr. Part No.SN74LS145D
MYR4.83
Each (In a Pack of 5)
units
LS Decoder, Driver 1-of-10 1 0 Open Collector Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V
RS Stock No. 100-0739
Mfr. Part No.CD74HCT42E
MYR4.17
Each (In a Tube of 25)
units
HCT Decoder, Demultiplexer 1-of-10 1 0 - Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V
RS Stock No. 709-2034
Mfr. Part No.CD74HC238E
MYR2.091
Each (In a Pack of 10)
units
HC Decoder, Demultiplexer 1-of-8 1 3 - Non-Inverting Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V
RS Stock No. 178-9194
Mfr. Part No.SN74AHC138D
MYR1.35
Each (In a Tube of 40)
units
AHC Decoder, Demultiplexer 1-of-8 1 3 - Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V
RS Stock No. 145-6405
Mfr. Part No.SN74LS156D
MYR3.40
Each (In a Tube of 40)
units
LS Decoder, Demultiplexer 1-of-4, 1-of-8 1, 2 2 Open Collector Inverting Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V
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