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
PHP40.154
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. 144-9997
Mfr. Part No.CD74HC238E
PHP23.579
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. 709-2034
Mfr. Part No.CD74HC238E
PHP22.857
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. 922-2903
Mfr. Part No.CD4511BE
PHP22.54
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
PHP28.734
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. 368-6039
Mfr. Part No.SN74LS138N
PHP33.61
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. 885-0705
Mfr. Part No.HT12D-20SOP
BrandHoltek
PHP41.981
Each (In a Tube of 38)
units
- - - - Surface Mount SOP 20 12.8 x 7.5 x 2.35mm 2.35mm 12.8mm 12 V +75 °C - 2.4 V
RS Stock No. 122-2833
Mfr. Part No.74HC138S16-13
PHP6.442
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. 121-9249
Mfr. Part No.SN74LS247N
PHP75.294
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. 798-9023
Mfr. Part No.74HC138S16-13
PHP16.922
Each (In a Pack of 25)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 709-2160
Mfr. Part No.SN74LS247N
PHP85.956
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. 528-066
Mfr. Part No.SN74HCT138D
PHP17.27
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 +85 °C - 4.5 V
RS Stock No. 170-8004
Mfr. Part No.74HC238D,653
BrandNexperia
PHP8.978
Each (On a Reel of 2500)
units
- - - - Surface Mount SO 16 10 x 4 x 1.45mm 1.45mm 10mm 6 V +125 °C - 2 V
RS Stock No. 100-0709
Mfr. Part No.LM567CN/NOPB
PHP90.763
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
PHP106.608
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. 662-8269
Mfr. Part No.SN74HCT138DR
PHP14.906
Each (In a Pack of 10)
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. 103-5683
Mfr. Part No.74HC238D,652
BrandNexperia
PHP25.41
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. 527-823
Mfr. Part No.CD74HC238M
PHP22.517
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. 483-6487
Mfr. Part No.74HC238D,652
BrandNexperia
PHP20.903
Each (In a Pack of 10)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 6 V +125 °C - 2 V
RS Stock No. 885-0768
Mfr. Part No.HT9170D-18SOP
BrandHoltek
PHP74.354
Each (In a Tube of 42)
units
3.57 → 3.58MHz CMOS - 60dB Surface Mount SOP 18 11.76 x 7.62 x 2.34mm 2.34mm 11.76mm 5.5 V +75 °C - 2.5 V
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