DTMF Decoders

DTMF (Dual Tone Multi-Frequency) decoders are devices that receive data transmissions in amateur radio frequency bands. They constantly monitor incoming signals for valid DTMF digits. These electronic circuits decode DTMF dial tones from telephone lines into touch-tone phones via a process known as tone dialing. 


The basic DTMF decoder identifies tones from a normal touch-tone phone. It then activates an LED to provide a 4-bit binary signal as an output code.

 

DTMF decoders are tolerant of level variations, but function optimally at a 0dB range.


What are DTMF decoders used for?

DTMF decoders increase connectivity in electronics to allow better control of applications. Home applications like alarm systems, electronic gates and garage doors, intercom systems and everyday appliances make use of DTMF functionalities. 


Public switched telephone networks (PSTN) and voice response systems are other examples where DTMF application is necessary. 


Types of DTMF decoders

The most common types of DTMF Decoders include 2-tone, 5-tone, multi-tone and burst-tone versions. Multi-tone decoders receive and translate multiple tones from the source, and burst-tone versions decode clashing frequencies into binary signals 


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Description Price Operating Frequency Fabrication Technology Typical Supply Current Minimum CMRR Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage Maximum Operating Temperature Automotive Standard Minimum Operating Supply Voltage
RS Stock No. 355-9460
Mfr. Part No.HEF4543BT,652
BrandNexperia
$0.77
Each
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
RS Stock No. 178-6970
Mfr. Part No.HEF4543BT,652
BrandNexperia
$0.615
Each (In a Tube of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
RS Stock No. 368-7329
Mfr. Part No.HEF4028BT,652
BrandNexperia
$0.512
Each (In a Tube of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
RS Stock No. 443-031
Mfr. Part No.SN74HC138N
$0.69
Each
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +85 °C - 2 V
RS Stock No. 922-2903
Mfr. Part No.CD4511BE
$0.699
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS Stock No. 662-9698
Mfr. Part No.CD4511BE
$0.812
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS Stock No. 121-9249
Mfr. Part No.SN74LS247N
$2.13
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
RS Stock No. 923-2486
Mfr. Part No.SN74HC138N
$0.562
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +85 °C - 2 V
RS Stock No. 809-6220
Mfr. Part No.CD4511BPW
$0.594
Each (In a Pack of 15)
units
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 18 V +125 °C - 3 V
RS Stock No. 709-2160
Mfr. Part No.SN74LS247N
$1.84
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
RS Stock No. 162-6504
Mfr. Part No.CD4511BPW
$0.594
Each (In a Tube of 90)
units
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 18 V +125 °C - 3 V
RS Stock No. 170-8040
Mfr. Part No.74HC154D,653
BrandNexperia
$0.419
Each (On a Reel of 1000)
units
- - - - Surface Mount SO 24 15.6 x 7.6 x 2.45mm 2.45mm 15.6mm 6 V +125 °C - 2 V
RS Stock No. 709-2655
Mfr. Part No.SN74LS155AN
$2.11
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
RS Stock No. 368-6039
Mfr. Part No.SN74LS138N
$1.116
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
RS Stock No. 527-823
Mfr. Part No.CD74HC238M
$0.716
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +125 °C - 2 V
RS Stock No. 144-9900
Mfr. Part No.SN74HC139N
$0.655
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +85 °C - 2 V
RS Stock No. 796-7953
Mfr. Part No.CD4515BM
$1.30
Each (In a Pack of 25)
units
- - - - Surface Mount SOIC 24 15.6 x 7.6 x 2.35mm 2.35mm 15.6mm 18 V +125 °C - 3 V
RS Stock No. 662-6835
Mfr. Part No.CD4028BM96
$0.482
Each (In a Pack of 10)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 18 V +125 °C - 3 V
RS Stock No. 662-7077
Mfr. Part No.CD74HC238M96
$0.579
Each (In a Pack of 10)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +125 °C - 2 V
RS Stock No. 178-6959
Mfr. Part No.74HC154D,652
BrandNexperia
$0.944
Each (In a Tube of 30)
units
- - - - Surface Mount SOIC 24 15.6 x 7.6 x 2.45mm 2.45mm 15.6mm 6 V +125 °C - 2 V
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