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. 816-8842
Mfr. Part No.74LVC2T45DC,125
BrandNexperia
SGD0.718
Each (In a Pack of 10)
units
LVC Transceiver - 4 - Single Ended 3 State Inverting Surface Mount VSSOP 8 -32mA 32mA 37.8ns
RS Stock No. 165-8732
Mfr. Part No.74LVC2T45DC,125
BrandNexperia
SGD0.553
Each (On a Reel of 3000)
units
LVC Transceiver - 4 - Single Ended 3 State Inverting Surface Mount VSSOP 8 -32mA 32mA 37.8ns
RS Stock No. 806-2267
Mfr. Part No.MC74ACT125DG
SGD0.654
Each (In a Pack of 25)
units
ACT Buffer - 4 No Single Ended 3 State Non-Inverting Surface Mount SOIC 14 24mA -24mA 10 ns @ 50 pF
RS Stock No. 162-9372
Mfr. Part No.M74VHC1GT126DF1G
SGD0.058
Each (On a Reel of 3000)
units
LSTTL Buffer - 1 No Single Ended Single Ended Non-Inverting Surface Mount SC-70 5 - - 16ns
RS Stock No. 145-2970
Mfr. Part No.MC74ACT125DG
SGD0.654
Each (In a Tube of 55)
units
ACT Buffer - 4 No Single Ended 3 State Non-Inverting Surface Mount SOIC 14 24mA -24mA 10 ns @ 50 pF
RS Stock No. 162-6736
Mfr. Part No.SN74LVT16244BDGGR
SGD1.379
Each (On a Reel of 2000)
units
74LVT Buffer - - No CMOS, TTL 3 State Non-Inverting Surface Mount TSSOP 48 -32mA 64mA 3.2 ns @ 3.3 V
RS Stock No. 796-8278
Mfr. Part No.SN74LVT16244BDGGR
SGD2.94
Each (In a Pack of 2)
units
74LVT Buffer - - No CMOS, TTL 3 State Non-Inverting Surface Mount TSSOP 48 -32mA 64mA 3.2 ns @ 3.3 V
RS Stock No. 791-6053
Mfr. Part No.M74VHC1GT126DF1G
SGD0.11
Each (On a Tape of 100)
units
LSTTL Buffer - 1 No Single Ended Single Ended Non-Inverting Surface Mount SC-70 5 - - 16ns
RS Stock No. 531-6647
Mfr. Part No.TC4049BP(F)
BrandToshiba
SGD0.891
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. 652-5016
Mfr. Part No.SN74AHC1G125DCKR
SGD0.372
Each (In a Pack of 10)
units
AHC - - - - - - - Surface Mount SC-70 5 -8mA 8mA 11.5 ns @ 3.3 V
RS Stock No. 145-5724
Mfr. Part No.SN74LVT125D
SGD5.14
Each (In a Tube of 50)
units
LVT Buffer, Line Driver - 4 No Single Ended 3 State Non-Inverting Surface Mount SOIC 14 -32mA 64mA 2.9 ns @ 3.3 V
RS Stock No. 179-2131
Mfr. Part No.SN74HCT125DR
SGD0.472
Each (In a Tube of 50)
units
HCT - - - - - - - Surface Mount SOIC 14 -6mA 6mA 36 ns @ 4.5 V
RS Stock No. 197-2962
Mfr. Part No.SN74LVT125D
SGD1.57
Each
units
LVT Buffer, Line Driver - 4 No Single Ended 3 State Non-Inverting Surface Mount SOIC 14 -32mA 64mA 2.9 ns @ 3.3 V
RS Stock No. 162-5263
Mfr. Part No.SN74AHC1G125DCKR
SGD0.059
Each (On a Reel of 3000)
units
AHC - - - - - - - Surface Mount SC-70 5 -8mA 8mA 11.5 ns @ 3.3 V
RS Stock No. 662-8266
Mfr. Part No.SN74HCT125DR
SGD0.582
Each (In a Pack of 10)
units
HCT Buffer, Line Driver Buffer & Line Driver - - Single Ended 3 State Non-Inverting Surface Mount SOIC 14 -6mA 6mA 36 ns @ 4.5 V
RS Stock No. 483-6689
Mfr. Part No.74HC7541D,112
BrandNexperia
SGD2.29
Each (In a Pack of 5)
units
HC Buffer, Line Driver - 8 Yes Single Ended 3 State Non-Inverting Surface Mount SOIC 20 -7.8mA 7.8mA 120 ns @ 2 V
RS Stock No. 662-9610
Mfr. Part No.CD4041UBM
SGD1.94
Each (In a Pack of 5)
units
4000 Buffer - 4 No Single Ended - Inverting, Non-Inverting Surface Mount SOIC 14 - - 120 ns @ 5 V
RS Stock No. 162-6705
Mfr. Part No.SN74LVC1G126DCKR
SGD0.068
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. 796-8243
Mfr. Part No.SN74LVC1G126DCKR
SGD0.372
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. 145-3613
Mfr. Part No.NL17SZ125DFT2G
SGD0.058
Each (On a Reel of 3000)
units
NL Buffer - 1 No Single Ended 3 State Non-Inverting Surface Mount SC-88A 5 -32mA 32mA 10.5 ns @ 15 pF