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 security alarm systems , electronic gates and garage doors, access control 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
  • 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. 178-6959
Mfr. Part No.74HC154D,652
BrandNexperia
£0.484
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. 483-6421
Mfr. Part No.74HC154D,652
BrandNexperia
£0.582
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
£0.18
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. 781-2831
Mfr. Part No.74HC4514D,652
BrandNexperia
£0.873
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. 662-9698
Mfr. Part No.CD4511BE
£0.45
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. 922-2903
Mfr. Part No.CD4511BE
£0.354
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. 923-2486
Mfr. Part No.SN74HC138N
£0.26
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. 885-0702
Mfr. Part No.HT12D-18DIP
BrandHoltek
£0.516
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. 368-6039
Mfr. Part No.SN74LS138N
£0.541
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. 100-0709
Mfr. Part No.LM567CN/NOPB
£1.469
Each (In a Tube of 40)
Units
0.5MHz Bipolar - - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm - - 9 V +70 °C - 4.75 V
RS Stock No. 460-819
Mfr. Part No.LM567CN/NOPB
£1.724
Each (In a Pack of 5)
Units
0.5MHz Bipolar 12mA - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm - - 9 V +70 °C - 4.75 V
RS Stock No. 368-4724
Mfr. Part No.SN7447AN
£2.081
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. 305-406
Mfr. Part No.SN7447AN
£2.46
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. 709-2037
Mfr. Part No.CD4028BE
£0.313
Each (In a Pack of 10)
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. 145-0465
Mfr. Part No.CD4028BE
£0.313
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. 144-9900
Mfr. Part No.SN74HC139N
£0.318
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. 443-047
Mfr. Part No.SN74HC139N
£0.43
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. 308-253
Mfr. Part No.SN74LS139AN
£0.63
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. 144-9897
Mfr. Part No.SN74LS139AN
£0.519
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. 144-9997
Mfr. Part No.CD74HC238E
£0.355
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