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. 145-0668
Mfr. Part No.SN74LS42N
MYR7.686
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
MYR9.36
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. 145-6103
Mfr. Part No.SN7445N
MYR10.094
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. 304-065
Mfr. Part No.SN7445N
MYR11.89
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. 305-406
Mfr. Part No.SN7447AN
MYR12.88
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. 368-4724
Mfr. Part No.SN7447AN
MYR10.621
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. 304-942
Mfr. Part No.SN74LS259BN
MYR4.70
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. 145-0381
Mfr. Part No.SN74LS259BN
MYR3.99
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. 368-6039
Mfr. Part No.SN74LS138N
MYR2.755
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. 166-1721
Mfr. Part No.NC7SZ19P6X
MYR0.319
Each (On a Reel of 3000)
units
- - - - Surface Mount SC-70 6 2 x 1.25 x 1mm 1mm 2mm 5.5 V +85 °C - 1.65 V
RS Stock No. 739-5175
Mfr. Part No.NC7SZ19P6X
MYR1.502
Each (In a Pack of 5)
units
- - - - Surface Mount SC-70 6 2 x 1.25 x 1mm 1mm 2mm 5.5 V +85 °C - 1.65 V
RS Stock No. 483-6392
Mfr. Part No.74HC137D,652
BrandNexperia
MYR2.176
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. 166-1282
Mfr. Part No.74HC137D,652
BrandNexperia
MYR2.146
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. 662-8626
Mfr. Part No.SN74LVC138APWR
MYR1.193
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. 178-9167
Mfr. Part No.CD74HCT238M96
MYR2.54
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 +125 °C - 4.5 V
RS Stock No. 638-037
Mfr. Part No.SN74ALS138AN
MYR4.01
Each
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V +70 °C - 4.5 V
RS Stock No. 443-047
Mfr. Part No.SN74HC139N
MYR1.75
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. 144-9994
Mfr. Part No.SN74HCT138N
MYR1.999
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V +85 °C - 4.5 V
RS Stock No. 709-1983
Mfr. Part No.SN74HCT138N
MYR1.938
Each (In a Pack of 10)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V +85 °C - 4.5 V
RS Stock No. 144-9900
Mfr. Part No.SN74HC139N
MYR1.416
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
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