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. 124-2261
Mfr. Part No.74HC4514D,652
BrandNexperia
TWD39.70
Each (In a Tube of 30)
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. 122-0107
Mfr. Part No.MC74HC138ADG
TWD9.00
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. 885-0705
Mfr. Part No.HT12D-20SOP
BrandHoltek
TWD21.70
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. 170-3561
Mfr. Part No.MC74HC138ADR2G
TWD3.30
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. 689-8709
Mfr. Part No.MC74HC138ADG
TWD12.40
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. 806-1413
Mfr. Part No.MC74HC138ADR2G
TWD10.60
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. 368-6039
Mfr. Part No.SN74LS138N
TWD23.60
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. 923-2486
Mfr. Part No.SN74HC138N
TWD11.60
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. 528-195
Mfr. Part No.SN74HCT139D
TWD12.60
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. 355-9460
Mfr. Part No.HEF4543BT,652
BrandNexperia
TWD18.00
Each
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
RS Stock No. 662-8272
Mfr. Part No.SN74HCT139DR
TWD13.20
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. 169-5679
Mfr. Part No.SN74HCT139DR
TWD5.30
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. 178-6970
Mfr. Part No.HEF4543BT,652
BrandNexperia
TWD14.60
Each (In a Tube of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
RS Stock No. 663-0036
Mfr. Part No.CD74HC138E
TWD19.00
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. 144-9994
Mfr. Part No.SN74HCT138N
TWD16.30
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. 662-8102
Mfr. Part No.SN74HC139DR
TWD10.00
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. 178-9211
Mfr. Part No.SN74LS47D
TWD52.20
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V +70 °C - 4.75 V
RS Stock No. 663-0363
Mfr. Part No.CD74HC4514M
TWD103.00
Each
units
- - - - Surface Mount SOIC 24 15.4 x 7.52 x 2.35mm 2.35mm 15.4mm 6 V +125 °C - 2 V
RS Stock No. 304-065
Mfr. Part No.SN7445N
TWD97.00
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. 483-6487
Mfr. Part No.74HC238D,652
BrandNexperia
TWD14.00
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