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. 145-0381
Mfr. Part No.SN74LS259BN
HK$7.923
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
HK$9.35
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
HK$24.78
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
HK$21.784
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. 662-7244
Mfr. Part No.CD74HCT138M96
HK$3.461
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 +125 °C - 4.5 V
RS Stock No. 145-6398
Mfr. Part No.CD74HCT138M96
HK$1.967
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 125 °C - 4.5 V
RS Stock No. 145-0082
Mfr. Part No.CD74HCT138M
HK$5.026
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. 833-709
Mfr. Part No.CD74HCT138M
HK$6.61
Each
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. 922-2903
Mfr. Part No.CD4511BE
HK$4.007
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
HK$5.108
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. 443-031
Mfr. Part No.SN74HC138N
HK$3.88
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. 709-1983
Mfr. Part No.SN74HCT138N
HK$3.981
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. 144-9994
Mfr. Part No.SN74HCT138N
HK$4.316
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. 527-158
Mfr. Part No.SN74HC138D
HK$3.409
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. 144-9897
Mfr. Part No.SN74LS139AN
HK$5.00
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. 483-6421
Mfr. Part No.74HC154D,652
BrandNexperia
HK$6.87
Each (In a Pack of 5)
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. 170-8040
Mfr. Part No.74HC154D,653
BrandNexperia
HK$2.432
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. 885-0702
Mfr. Part No.HT12D-18DIP
BrandHoltek
HK$5.931
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. 162-7426
Mfr. Part No.SN74LV138APWR
HK$0.961
Each (On a Reel of 2000)
units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 5.5 V +85 °C - 2 V
RS Stock No. 308-253
Mfr. Part No.SN74LS139AN
HK$7.41
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