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. 885-0702
Mfr. Part No.HT12D-18DIP
BrandHoltek
SGD1.05
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 18 23.37 x 7.11 x 4.95mm 4.95mm 23.37mm 12 V +75 °C - 2.4 V
RS Stock No. 443-047
Mfr. Part No.SN74HC139N
SGD0.58
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. 460-819
Mfr. Part No.LM567CN/NOPB
SGD3.292
Each (In a Pack of 5)
units
0.5MHz Bipolar 12mA - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm - - 9 V +70 °C - 4.75 V
RS Stock No. 100-0709
Mfr. Part No.LM567CN/NOPB
SGD2.434
Each (In a Tube of 40)
units
0.5MHz Bipolar - - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm - - 9 V +70 °C - 4.75 V
RS Stock No. 144-9900
Mfr. Part No.SN74HC139N
SGD0.517
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. 308-253
Mfr. Part No.SN74LS139AN
SGD1.06
Each
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
SGD0.861
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. 709-2160
Mfr. Part No.SN74LS247N
SGD2.686
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. 144-9897
Mfr. Part No.SN74LS139AN
SGD0.877
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. 121-9249
Mfr. Part No.SN74LS247N
SGD2.25
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. 436-7537
Mfr. Part No.74HC237D,652
BrandNexperia
SGD0.611
Each (In a Tube of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 6 V +125 °C - 2 V
RS Stock No. 145-6686
Mfr. Part No.SN74F138D
SGD0.731
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V +70 °C - 4.5 V
RS Stock No. 170-3561
Mfr. Part No.MC74HC138ADR2G
SGD0.145
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 806-1413
Mfr. Part No.MC74HC138ADR2G
SGD0.38
Each (On a Tape of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 689-8709
Mfr. Part No.MC74HC138ADG
SGD0.458
Each (In a Pack of 5)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 122-0107
Mfr. Part No.MC74HC138ADG
SGD0.378
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 709-2034
Mfr. Part No.CD74HC238E
SGD0.60
Each (In a Pack of 10)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +125 °C - 2 V
RS Stock No. 144-9997
Mfr. Part No.CD74HC238E
SGD0.668
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 +125 °C - 2 V
RS Stock No. 662-7077
Mfr. Part No.CD74HC238M96
SGD0.442
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. 527-823
Mfr. Part No.CD74HC238M
SGD0.588
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
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