Encoder & Decoder ICs

Encoders are logic semiconductor ICs (integrated circuits) that have been designed to encode and decode digital binary codes for inputs whilst decoders 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 dialling.

How do Encoders and Decoders work?

An encoder IC is manufactured to encode digital data from one format type or code to another that can accept multiple inputs and generate multi-bit output. Their primary functions are speed, security, standardisation by shrinking the size.

Decoder ICs increase connectivity in electronics to allow better control of applications. Home units like security alarm systems, electronic gates and garage doors, access control systems and everyday appliances make use of DTMF functionalities.

Types of Encoders and Decoders?

Encoder ICs are available with different encoding types such as Key and priority.

A DTMF (Dual Tone Multi-Frequency) decoder IC is a device that receives 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 dialling.

The most common types of DTMF Decoder ICs include 2-tone, 5-tone, multi-tone and burst-tone versions. Multi-tone decoders receive and translate multiple tones from the source whilst Burst-tone versions decode clashing frequencies into binary signals.

As well as being offered with variations of logic families, the number of pins on the IC and different mount types.

Applications of encoders and decoders

Encoders and decoders have an array of application use such as;

  • Smoke and fire alarm system
  • Home security systems
  • Identity tokens
  • Mobile phones and landlines

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Description Price Operating Frequency Fabrication Technology Typical Supply Current Minimum CMRR Mounting Type Package Type Pin Count Dimensions Maximum Operating Supply Voltage Maximum Operating Temperature Automotive Standard Minimum Operating Supply Voltage Minimum Operating Temperature
RS Stock No. 885-0702
Mfr. Part No.HT12D-18DIP
BrandHoltek
SGD1.082
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 18 23.37 x 7.11 x 4.95mm 12 V +75 °C - 2.4 V -20 °C
RS Stock No. 460-819
Mfr. Part No.LM567CN/NOPB
SGD3.634
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 0 °C
RS Stock No. 443-047
Mfr. Part No.SN74HC139N
SGD0.71
Each
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 6 V +85 °C - 2 V -40 °C
RS Stock No. 100-0709
Mfr. Part No.LM567CN/NOPB
SGD3.108
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 0 °C
RS Stock No. 144-9900
Mfr. Part No.SN74HC139N
SGD0.612
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 6 V +85 °C - 2 V -40 °C
RS Stock No. 308-253
Mfr. Part No.SN74LS139AN
SGD1.40
Each
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.25 V +70 °C - 4.75 V 0 °C
RS Stock No. 709-2160
Mfr. Part No.SN74LS247N
SGD3.15
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.25 V +70 °C - 4.75 V 0 °C
RS Stock No. 121-9249
Mfr. Part No.SN74LS247N
SGD2.856
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.25 V +70 °C - 4.75 V 0 °C
RS Stock No. 144-9897
Mfr. Part No.SN74LS139AN
SGD1.218
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.25 V +70 °C - 4.75 V 0 °C
RS Stock No. 368-6039
Mfr. Part No.SN74LS138N
SGD1.312
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.25 V +70 °C - 4.75 V 0 °C
RS Stock No. 885-0692
Mfr. Part No.HT12E-18DIP
BrandHoltek
SGD1.249
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 18 23.37 x 7.11 x 4.95mm 12 V +75 °C - 2.4 V -20 °C
RS Stock No. 145-6686
Mfr. Part No.SN74F138D
SGD0.763
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 5.5 V +70 °C - 4.5 V 0 °C
RS Stock No. 436-7537
Mfr. Part No.74HC237D,652
BrandNexperia
SGD0.754
Each (In a Tube of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 6 V +125 °C - 2 V -40 °C
RS Stock No. 170-3561
Mfr. Part No.MC74HC138ADR2G
SGD0.163
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +125 °C - 2 V -55 °C
RS Stock No. 689-8709
Mfr. Part No.MC74HC138ADG
SGD0.564
Each (In a Pack of 5)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +125 °C - 2 V -55 °C
RS Stock No. 806-1413
Mfr. Part No.MC74HC138ADR2G
SGD0.528
Each (On a Tape of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +125 °C - 2 V -55 °C
RS Stock No. 122-0107
Mfr. Part No.MC74HC138ADG
SGD0.396
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +125 °C - 2 V -55 °C
RS Stock No. 709-2034
Mfr. Part No.CD74HC238E
SGD0.909
Each (In a Pack of 10)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 6 V +125 °C - 2 V -55 °C
RS Stock No. 527-823
Mfr. Part No.CD74HC238M
SGD0.65
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 6 V +125 °C - 2 V -55 °C
RS Stock No. 144-9997
Mfr. Part No.CD74HC238E
SGD0.704
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 6 V +125 °C - 2 V -55 °C