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. 304-942
Mfr. Part No.SN74LS259BN
HK$10.33
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. 145-0381
Mfr. Part No.SN74LS259BN
HK$9.796
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. 368-4724
Mfr. Part No.SN7447AN
HK$25.431
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. 305-406
Mfr. Part No.SN7447AN
HK$30.01
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. 145-6398
Mfr. Part No.CD74HCT138M96
HK$2.268
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 5.5 V 125 °C - 4.5 V -55 °C
RS Stock No. 833-709
Mfr. Part No.CD74HCT138M
HK$6.74
Each
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 5.5 V +125 °C - 4.5 V -55 °C
RS Stock No. 662-7244
Mfr. Part No.CD74HCT138M96
HK$5.198
Each (In a Pack of 10)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 5.5 V +125 °C - 4.5 V -55 °C
RS Stock No. 922-2903
Mfr. Part No.CD4511BE
HK$5.008
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 18 V +125 °C - 3 V -55 °C
RS Stock No. 662-9698
Mfr. Part No.CD4511BE
HK$5.754
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 18 V +125 °C - 3 V -55 °C
RS Stock No. 443-031
Mfr. Part No.SN74HC138N
HK$5.61
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. 144-9994
Mfr. Part No.SN74HCT138N
HK$4.714
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.5 V +85 °C - 4.5 V -40 °C
RS Stock No. 709-1983
Mfr. Part No.SN74HCT138N
HK$4.715
Each (In a Pack of 10)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 5.5 V +85 °C - 4.5 V -40 °C
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 5.5 V +85 °C - 2 V -40 °C
RS Stock No. 662-9531
Mfr. Part No.CD40147BE
HK$5.754
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 18 V +125 °C - 3 V -55 °C
RS Stock No. 144-9897
Mfr. Part No.SN74LS139AN
HK$6.248
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. 662-8430
Mfr. Part No.SN74LV138APWR
HK$3.14
Each (In a Pack of 10)
units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 5.5 V +85 °C - 2 V -40 °C
RS Stock No. 308-253
Mfr. Part No.SN74LS139AN
HK$15.28
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. 145-0477
Mfr. Part No.CD74HC147EE4
HK$3.164
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
RS Stock No. 709-2700
Mfr. Part No.CD74HC147EE4
HK$5.826
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. 145-0416
Mfr. Part No.CD40147BE
HK$4.295
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 18 V +125 °C - 3 V -55 °C