Buffers

Buffers, also known as logic buffers are semiconductor IC (integrated circuit) that are constructed of two inverters that are back to back providing a basic logic gate that passes its input, unchanged, to its output. Buffer ICs are also available in both inverting and non-inverting.

How do buffers work?

The primary purpose of a buffer IC is to regenerate the input, primarily using a strong low and high and also to regenerate weak output from non-restoring logic. They are also used to increase the propagation delay of circuits by driving the large capacitive load.

Buffers also feature transceivers and drivers that are used to regenerate the input utilising a strong high and a strong low. Buffer gates serve as an amplifier of a weak signal source is cant source a lot of current whilst increasing the current capacity of the signal so as to be able to drive a load.

Types of buffers

Buffers are available with a variety of configurations such as variations on the number of channels available, supporting a variety of different inputs and outputs such as CMOS, DTL (Diode-Transistor Logic) and single-ended and providing support for a range of logic families such as HC, HEF and TTL. Buffers are also available in combination with a converter.

Another type of buffer that is available is Bus buffers. A bus buffer is an IC that connects multiple data sources to a single bus. The open drivers can be selected to be either a logical high, a logical low, or high impedance which allows other buffers to drive the bus. Like buffers, variations of bus buffers are available such as support for different logic families, inputs, outputs as well as the number of pins configured on the IC.

Bus buffers are used in applications such as TV and video equipment, industrial controls and portable equipment.

Application

Buffers have a wide range of application use such as;

  • Automatic test equipment
  • Board test systems
  • Instrumentation and characterization equipment
  • Semiconductor test systems

...
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Description Price Logic Family Logic Function IC Type Number of Channels Schmitt Trigger Input Input Type Output Type Polarity Mounting Type Package Type Pin Count Maximum High Level Output Current Maximum Low Level Output Current Maximum Propagation Delay Time @ Maximum CL
RS Stock No. 526-729
Mfr. Part No.SN74LVC125APWR
PHP14.188
Each (In a Pack of 20)
units
LVC - - - - - - - Surface Mount TSSOP 14 -24mA 24mA 5.3 ns @ 2.7 V
RS Stock No. 144-9937
Mfr. Part No.CD4049UBD
PHP24.592
Each (In a Tube of 40)
units
4000 Buffer, Converter - 6 - Single Ended - Inverting Surface Mount SOIC 16 -5.2mA 26mA 50 ns @ 15 V, 65 ns @ 10 V, 120 ns @ 5 V
RS Stock No. 662-9638
Mfr. Part No.CD4049UBD
PHP30.586
Each (In a Pack of 5)
units
4000 Buffer, Converter - 6 - Single Ended - Inverting Surface Mount SOIC 16 -5.2mA 26mA 50 ns @ 15 V, 65 ns @ 10 V, 120 ns @ 5 V
RS Stock No. 145-0136
Mfr. Part No.CD4041UBE
PHP63.284
Each (In a Tube of 25)
units
4000 Buffer - 4 No Single Ended - Inverting, Non-Inverting Through Hole PDIP 14 - - 120 ns @ 5 V
RS Stock No. 662-9616
Mfr. Part No.CD4041UBE
PHP69.458
Each (In a Pack of 5)
units
4000 Buffer - 4 No Single Ended - Inverting, Non-Inverting Through Hole PDIP 14 - - 120 ns @ 5 V
RS Stock No. 165-8572
Mfr. Part No.74LVC2G17GW,125
BrandNexperia
PHP3.942
Each (On a Reel of 3000)
units
LVC Buffer - 2 Yes Schmitt Trigger Single Ended Non-Inverting Surface Mount SC-88 6 -32mA 32mA 13.1ns
RS Stock No. 163-2457
Mfr. Part No.MC14049BDG
PHP20.328
Each (In a Tube of 48)
units
4000 Buffer, Converter - 6 No Single Ended - Inverting Surface Mount SOIC 16 - - 140 ns @ 5 V
RS Stock No. 162-6705
Mfr. Part No.SN74LVC1G126DCKR
PHP2.268
Each (On a Reel of 3000)
units
74LVC Buffer - 1 No CMOS, TTL 3 State Non-Inverting Surface Mount SC-70 5 -32mA 32mA 4.2 ns @ 5 V
RS Stock No. 688-1515
Mfr. Part No.MC14049BDG
PHP25.21
Each (In a Pack of 5)
units
4000 Buffer, Converter - 6 No Single Ended - Inverting Surface Mount SOIC 16 - - 140 ns @ 5 V
RS Stock No. 816-8823
Mfr. Part No.74LVC2G17GW,125
BrandNexperia
PHP10.752
Each (In a Pack of 40)
units
LVC Buffer - 2 Yes Schmitt Trigger Single Ended Non-Inverting Surface Mount SC-88 6 -32mA 32mA 13.1ns
RS Stock No. 796-8243
Mfr. Part No.SN74LVC1G126DCKR
PHP12.296
Each (In a Pack of 25)
units
74LVC Buffer - 1 No CMOS, TTL 3 State Non-Inverting Surface Mount SC-70 5 -32mA 32mA 4.2 ns @ 5 V
RS Stock No. 891-2825
Mfr. Part No.TC7W125FU(TE12L,F)
BrandToshiba
PHP18.643
Each (In a Pack of 10)
units
CMOS - - - - - - - Surface Mount SSOP 8 -7.8mA 7.8mA 165 ns@ 150 pF
RS Stock No. 798-8887
Mfr. Part No.74AHC125S14-13
PHP16.516
Each (In a Pack of 25)
units
AHC Schmitt Trigger Buffer - 4 Yes Schmitt Trigger 3 State Non-Inverting Surface Mount SOIC 14 -4mA 8mA 14.5 ns @ 50 pF
RS Stock No. 531-6647
Mfr. Part No.TC4049BP(F)
BrandToshiba
PHP18.173
Each (In a Pack of 10)
units
4000 Buffer, Converter - 6 - Single Ended - Inverting Through Hole PDIP 16 -4.8mA 28mA 50 ns @ 15 V, 65 ns @ 10 V, 120 ns @ 5 V
RS Stock No. 483-6960
Mfr. Part No.P82B96TD,112
BrandNXP
PHP172.87
Each
units
LVC - - - - - - - Surface Mount SOIC 8 - - -
RS Stock No. 169-7215
Mfr. Part No.74AHC125S14-13
PHP6.09
Each (On a Reel of 2500)
units
AHC Schmitt Trigger Buffer - 4 Yes Schmitt Trigger 3 State Non-Inverting Surface Mount SOIC 14 -4mA 8mA 14.5 ns @ 50 pF
RS Stock No. 124-2339
Mfr. Part No.P82B96TD,112
BrandNXP
PHP140.925
Each (In a Tube of 100)
units
LVC - - - - - - - Surface Mount SOIC 8 - - -
RS Stock No. 527-760
Mfr. Part No.CD74HC4050M
PHP22.071
Each (In a Tube of 40)
units
HC Buffer, Converter - 6 No Single Ended - Non-Inverting Surface Mount SOIC 16 -5.2mA 5.2mA 85 ns @ 2 V
RS Stock No. 121-9225
Mfr. Part No.SN74LVC3G17DCTR
PHP10.272
Each (On a Reel of 3000)
units
LVC Schmitt Trigger Buffer - 3 Yes Single Ended - Non-Inverting Surface Mount SSOP 8 -32mA 32mA 5.4 ns @ 3.3 V
RS Stock No. 816-8832
Mfr. Part No.74LVC2G34GW,125
BrandNexperia
PHP11.55
Each (In a Pack of 40)
units
LVC Buffer - 2 No Single Ended Single Ended Inverting Surface Mount SC-88 6 -32mA 32mA 10.8ns