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. 662-8102
Mfr. Part No.SN74HC139DR
R 1.644
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 +85 °C - 2 V
RS stock no. 526-921
Mfr. Part No.SN74HC139D
R 7.006
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 +85 °C - 2 V
RS stock no. 662-8626
Mfr. Part No.SN74LVC138APWR
R 4.58
Each (In a Pack of 10)
units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 3.6 V +85 °C - 1.65 V
RS stock no. 663-2818
Mfr. Part No.SN74LVC138APW
R 6.546
Each (In a Pack of 10)
units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 3.6 V +85 °C - 1.65 V
RS stock no. 100-0709
Mfr. Part No.LM567CN/NOPB
R 32.655
Each (In a Tube of 40)
units
0.5MHz Bipolar - - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm 3.3mm 9.27mm 9 V +70 °C - 4.75 V
RS stock no. 460-819
Mfr. Part No.LM567CN/NOPB
R 38.462
Each (In a Pack of 5)
units
0.5MHz Bipolar 12mA - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm 3.3mm 9.27mm 9 V +70 °C - 4.75 V
RS stock no. 885-0702
Mfr. Part No.HT12D-18DIP
BrandHoltek
R 18.385
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. 526-600
Mfr. Part No.SN74F138D
R 4.52
Each (In a Pack of 20)
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. 102-5740
Mfr. Part No.LM567CM/NOPB
R 31.637
Each (In a Tube of 95)
units
0.5MHz Bipolar - - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 9 V +70 °C - 4.75 V
RS stock no. 145-6686
Mfr. Part No.SN74F138D
R 7.441
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. 536-0953
Mfr. Part No.LM567CM/NOPB
R 37.935
Each (In a Pack of 10)
units
0.5MHz Bipolar 12mA - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 9 V +70 °C - 4.75 V
RS stock no. 806-2166
Mfr. Part No.MC74AC139DG
R 6.629
Each (In a Pack of 25)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +85 °C - 2 V
RS stock no. 121-9249
Mfr. Part No.SN74LS247N
R 24.933
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
R 30.048
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. 436-7537
Mfr. Part No.74HC237D,652
BrandNexperia
R 8.338
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. 125-0024
Mfr. Part No.MC14511BDG
R 7.492
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 18 V +125 °C - 3 V
RS stock no. 781-2831
Mfr. Part No.74HC4514D,652
BrandNexperia
R 19.803
Each (In a Pack of 10)
units
- - - - Surface Mount SOIC 24 15.6 x 7.6 x 2.45mm 2.45mm 15.6mm 6 V +125 °C - 2 V
RS stock no. 169-5679
Mfr. Part No.SN74HCT139DR
R 2.814
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V +85 °C - 4.5 V
RS stock no. 145-0668
Mfr. Part No.SN74LS42N
R 32.056
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. 307-575
Mfr. Part No.SN74LS42N
R 38.26
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