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. 770-5308
Mfr. Part No.74LVC06AT14-13
HK$2.782
Each (In a Pack of 25)
units
LVC NOT - - - CMOS Open Drain - Surface Mount TSSOP 14 -32mA 32mA 5 ns @ 2.7 V
RS Stock No. 184-4254
Mfr. Part No.MC14050BDG
HK$3.481
Each (In a Tube of 48)
units
4000 Buffer - 6 - CMOS - Non-Inverting Surface Mount SOIC 16 -4.7mA 30mA 140 ns @ 50 pF
RS Stock No. 169-7124
Mfr. Part No.74LVC07AT14-13
HK$0.854
Each (On a Reel of 2500)
units
74LVC Non-Inverting - - No CMOS Open Drain - Surface Mount TSSOP 14 -32mA 32mA 5 ns @ 2.7 V
RS Stock No. 146-0913
Mfr. Part No.74LVC1G17GV,125
BrandNexperia
HK$0.341
Each (On a Reel of 3000)
units
LVC Buffer - 1 Yes Schmitt Trigger Single Ended Non-Inverting Surface Mount SC-74A 5 -32mA 32mA 14ns
RS Stock No. 805-6455
Mfr. Part No.MC74VHCT50ADR2G
HK$3.062
Each (On a Tape of 50)
units
LSTTL Buffer - 6 No Single Ended Single Ended Non-Inverting Surface Mount SOIC 14 -8mA 8mA 10.5 ns @ 50 pF
RS Stock No. 816-8791
Mfr. Part No.74LVC1T45GW,125
BrandNexperia
HK$2.814
Each (In a Pack of 10)
units
LVC Transceiver - 1 - Single Ended 3 State Non-Inverting Surface Mount SC-88 6 -32mA 32mA 31.8ns
RS Stock No. 171-3302
Mfr. Part No.74LCX540FT
BrandToshiba
HK$2.804
Each (On a Reel of 2500)
units
74LCX - - 8 - CMOS - Inverting Surface Mount TSSOP 20 -24mA 24mA 25 ns @ 50 pF
RS Stock No. 171-3294
Mfr. Part No.74LCX244FT
BrandToshiba
HK$2.804
Each (On a Reel of 2500)
units
74LCX - - - - - - - Surface Mount TSSOP 20 -24mA 24mA 25 ns @ 50 pF
RS Stock No. 806-1208
Mfr. Part No.NC7WZ16L6X
HK$3.10
Each (In a Pack of 25)
units
TinyLogic UHS Buffer - 2 No Single Ended Single Ended Non-Inverting Surface Mount MicroPak 6 -32mA 32mA 10.6ns
RS Stock No. 816-8810
Mfr. Part No.74LVC2G125DP,125
BrandNexperia
HK$3.887
Each (In a Pack of 30)
units
LVC Buffer - 2 No Single Ended 3 State Non-Inverting Surface Mount TSSOP 8 -32mA 32mA 11.4ns
RS Stock No. 791-6044
Mfr. Part No.M74VHC1GT125DF2G
HK$0.889
Each (In a Pack of 100)
units
LSTTL Buffer - 1 No Single Ended Single Ended Non-Inverting Surface Mount SC-70 5 - - 16ns
RS Stock No. 122-2832
Mfr. Part No.74HC125T14-13
HK$1.061
Each (On a Reel of 2500)
units
HC Schmitt Trigger Buffer - 4 Yes Schmitt Trigger 3 State Non-Inverting Surface Mount TSSOP 14 -4mA 5.2mA 150 ns @ 50 pF
RS Stock No. 802-1608
Mfr. Part No.NL17SZ126DFT2G
HK$0.935
Each (On a Tape of 200)
units
NL Buffer - 1 No Single Ended 3 State Non-Inverting Surface Mount SC-88A 5 -32mA 32mA 12.5 ns @ 15 pF
RS Stock No. 146-0566
Mfr. Part No.74AHC1G125SE-7
HK$0.386
Each (On a Reel of 3000)
units
74AHC Buffer, Bus driver - 1 Yes Schmitt Trigger 3 State Non-Inverting Surface Mount SOT-353 5 -8mA 8mA 14.5 ns @ 50 pF
RS Stock No. 171-3055
Mfr. Part No.TC7WZ17FK
BrandToshiba
HK$0.948
Each (On a Reel of 3000)
units
- - - 1 Yes CMOS, Schmitt Trigger CMOS Non-Inverting Surface Mount SOT-765 8 -32mA 32mA 17.5 ns @ 15 pF
RS Stock No. 166-2941
Mfr. Part No.NC7WV125K8X
HK$2.058
Each (On a Reel of 3000)
units
TinyLogic ULP Buffer - 2 No Single Ended 3 State Non-Inverting Surface Mount US 8 -24mA 24mA 4.9 ns @ 30 pF
RS Stock No. 145-3866
Mfr. Part No.NL27WZ07DFT2G
HK$0.512
Each (On a Reel of 3000)
units
LVTTL Buffer - 2 No Single Ended Open Drain Non-Inverting Surface Mount SC-88 6 - 32mA 12ns
RS Stock No. 196-2007
Mfr. Part No.ST3232ECTR
HK$9.167
Each (In a Pack of 10)
units
- Driver - 1 - - CMOS, TTL - Surface Mount TSSOP 16 -1mA 1.6mA -
RS Stock No. 660-7420
Mfr. Part No.SN74LVC2G17QDCKRQ1
HK$5.03
Each (In a Pack of 10)
units
LVC Schmitt Trigger Buffer - 2 Yes Single Ended - Non-Inverting Surface Mount SC-70 6 -32mA 32mA 5.4 ns @ 3.3 V
RS Stock No. 171-3175
Mfr. Part No.TC7SH126F
BrandToshiba
HK$0.432
Each (In a Pack of 100)
units
- - - - - - - - Surface Mount SOT-25 5 -8mA 8mA 14.5 ns @ 50 pF