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. 308-360
Mfr. Part No.SN74LS367AN
MYR4.87
Each
units
LS Buffer, Line Driver - 6 No Single Ended 3 State Non-Inverting Through Hole PDIP 16 -2.6mA 24mA 22 ns @ 5 V
RS Stock No. 309-228
Mfr. Part No.SN74LS365AN
MYR6.51
Each
units
LS Buffer, Line Driver - 6 No Single Ended 3 State Non-Inverting Through Hole PDIP 16 -2.6mA 24mA 22 ns @ 5 V
RS Stock No. 145-0387
Mfr. Part No.SN74LS365AN
MYR5.24
Each (In a Tube of 25)
units
LS Buffer, Line Driver - 6 No Single Ended 3 State Non-Inverting Through Hole PDIP 16 -2.6mA 24mA 22 ns @ 5 V
RS Stock No. 145-3320
Mfr. Part No.M74VHC1G125DFT2G
MYR0.206
Each (On a Reel of 3000)
units
VHC Buffer - 1 No Single Ended 3 State Non-Inverting Surface Mount SC-88A 5 -8mA 8mA 16 ns @ 50 pF
RS Stock No. 805-1481
Mfr. Part No.M74VHC1G125DFT2G
MYR0.456
Each (On a Tape of 100)
units
VHC Buffer - 1 No Single Ended 3 State Non-Inverting Surface Mount SC-88A 5 -8mA 8mA 16 ns @ 50 pF
RS Stock No. 121-8441
Mfr. Part No.SN74LVC1G125DBVR
MYR0.21
Each (On a Reel of 3000)
units
LVC - - - - - - - Surface Mount SOT-23 5 -32mA 32mA 4 ns @ 5 V
RS Stock No. 528-264
Mfr. Part No.SN74LVC1G125DBVR
MYR0.963
Each (In a Pack of 25)
units
LVC - - - - - - - Surface Mount SOT-23 5 -32mA 32mA 4 ns @ 5 V
RS Stock No. 144-9901
Mfr. Part No.SN74HC367N
MYR2.457
Each (In a Tube of 25)
units
HC Buffer, Line Driver - 6 No Single Ended 3 State Non-Inverting Through Hole PDIP 16 -7.8mA 7.8mA 120 ns @ 2 V
RS Stock No. 443-198
Mfr. Part No.SN74HC367N
MYR2.85
Each
units
HC Buffer, Line Driver - 6 No Single Ended 3 State Non-Inverting Through Hole PDIP 16 -7.8mA 7.8mA 120 ns @ 2 V
RS Stock No. 922-2861
Mfr. Part No.SN74LVC2G17DBVT
MYR3.119
Each (On a Reel of 250)
units
LVC Schmitt Trigger Buffer - 2 Yes Single Ended - Non-Inverting Surface Mount SOT-23 6 -32mA 32mA 5.4 ns @ 3.3 V
RS Stock No. 162-6705
Mfr. Part No.SN74LVC1G126DCKR
MYR0.199
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. 166-3773
Mfr. Part No.NC7SP125P5X
MYR0.551
Each (On a Reel of 3000)
units
TinyLogic ULP Buffer - 1 No Power Down High Impedance 3 State Inverting Surface Mount SC-70 5 -2.6mA 2.6mA 51.1ns
RS Stock No. 145-7376
Mfr. Part No.SN74LVC2G34DCKR
MYR0.531
Each (On a Reel of 3000)
units
LVC Buffer - 2 No Single Ended - Non-Inverting Surface Mount SC-70 6 -32mA 32mA 4.1 ns @ 3.3 V
RS Stock No. 162-6725
Mfr. Part No.SN74LVC2G125DCUR
MYR0.664
Each (On a Reel of 3000)
units
LVC - - - - - - - Surface Mount US 8 - - 4.2 ns @ 5 V
RS Stock No. 169-7477
Mfr. Part No.74LV07AS14-13
MYR0.413
Each (On a Reel of 2500)
units
74LV Buffer - 6 Yes Schmitt Trigger Open Drain - Surface Mount SOIC 14 - 12mA 8.5 ns @ 50 pF
RS Stock No. 921-2858
Mfr. Part No.P82B715P
MYR10.815
Each (In a Tube of 50)
units
P82B - - - - - - - Through Hole PDIP 8 - - -
RS Stock No. 807-2369
Mfr. Part No.CD4050BDW
MYR2.184
Each (In a Pack of 40)
units
4050 Buffer, Converter - 6 - CMOS, Single Ended DTL, TTL Non-Inverting Surface Mount SOIC 16 -8mA 48mA 140 ns@ 50 pF
RS Stock No. 806-6171
Mfr. Part No.NC7SP125P5X
MYR1.49
Each (In a Pack of 25)
units
TinyLogic ULP Buffer - 1 No Power Down High Impedance 3 State Inverting Surface Mount SC-70 5 -2.6mA 2.6mA 51.1ns
RS Stock No. 662-8944
Mfr. Part No.SN74LVC2G17DBVT
MYR4.778
Each (In a Pack of 5)
units
LVC Schmitt Trigger Buffer - 2 Yes Single Ended - Non-Inverting Surface Mount SOT-23 6 -32mA 32mA 5.4 ns @ 3.3 V
RS Stock No. 163-2457
Mfr. Part No.MC14049BDG
MYR2.128
Each (In a Tube of 48)
units
4000 Buffer, Converter - 6 No Single Ended - Inverting Surface Mount SOIC 16 - - 140 ns @ 5 V