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. 122-0107
Mfr. Part No.MC74HC138ADG
TWD9.20
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. 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 6 V +125 °C - 2 V -55 °C
RS Stock No. 806-1413
Mfr. Part No.MC74HC138ADR2G
TWD10.90
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. 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 6 V +125 °C - 2 V -55 °C
RS Stock No. 806-3309
Mfr. Part No.MC14543BDR2G
TWD13.50
Each (In a Pack of 25)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 18 V +125 °C - -0.5 V -55 °C
RS Stock No. 163-0548
Mfr. Part No.MC14543BDR2G
TWD5.10
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 18 V +125 °C - -0.5 V -55 °C
RS Stock No. 184-4262
Mfr. Part No.MC14543BDG
TWD14.40
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm +18 V +125 °C AEC-Q100 -5 V -55 °C
RS Stock No. 163-0573
Mfr. Part No.MC74AC138DG
TWD13.50
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +85 °C - 2 V -40 °C
RS Stock No. 806-2163
Mfr. Part No.MC74AC138DG
TWD11.20
Each (In a Pack of 25)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +85 °C - 2 V -40 °C
RS Stock No. 802-1358
Mfr. Part No.74VHC138M
TWD25.30
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 3.988 x 1.499mm 5.5 V +85 °C - 2 V -40 °C
RS Stock No. 166-1721
Mfr. Part No.NC7SZ19P6X
TWD2.70
Each (On a Reel of 3000)
units
- - - - Surface Mount SC-70 6 2 x 1.25 x 1mm 5.5 V +85 °C - 1.65 V -40 °C
RS Stock No. 806-3917
Mfr. Part No.MC74VHC139DTR2G
TWD11.80
Each (In a Pack of 25)
units
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 5.5 V +125 °C - 2 V -55 °C
RS Stock No. 125-0024
Mfr. Part No.MC14511BDG
TWD18.20
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 18 V +125 °C - 3 V -55 °C
RS Stock No. 761-4306
Mfr. Part No.74ACT138SCX
TWD16.60
Each (On a Tape of 10)
units
- - - - Surface Mount SOIC 16 10 x 6.198 x 1.499mm 5.5 V +85 °C - 4.5 V -40 °C
RS Stock No. 145-4239
Mfr. Part No.MC74HC238ADR2G
TWD3.30
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. 671-1539
Mfr. Part No.74ACT138SC
TWD16.60
Each (In a Pack of 20)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 5.5 V +85 °C - 4.5 V -40 °C
RS Stock No. 806-3731
Mfr. Part No.MC74LCX138DTG
TWD10.50
Each (In a Pack of 50)
units
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 3.6 V +85 °C - 2 V -40 °C
RS Stock No. 671-1740
Mfr. Part No.MM74HC138M
TWD22.20
Each (In a Pack of 5)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V +85 °C - 2 V -40 °C
RS Stock No. 145-2978
Mfr. Part No.MC14532BDG
TWD22.10
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 18 V +125 °C - 3 V -55 °C
RS Stock No. 145-4506
Mfr. Part No.MM74HC138M
TWD17.80
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 6 V 85 °C - 2 V -40 °C