 # Logic Gates

Logic gates are one of the building blocks of digital circuits, and you can use combinations of them to perform complex electronic operations. Browse our extensive product range below and use the search filters on the left to narrow down your options by brand, logic function and more.

## What are logic gates?

A logic gate is a device which can carry out functions on a signal with two values. Most have two inputs and one output, with the inputs receiving binary data - low 0 or high 1 - through the voltage input.

Each terminal is continuously in the binary condition low or high, which is represented by differing levels of voltage. As a circuit processes data, their state can and regularly will change, with the low state at zero volts and the high state at three to five volts positive in most cases.

In theory, you can combine as many logic gates in a circuit as you need to. By doing so you can create circuits such as flip flops, latches, multiplexers and more; though for larger numbers of gates you may wish to use integrated circuits to save on physical space.

## What are the different types of logic gate?

There are seven core types of logic gate, and they are as follows:

AND gates: If 0 is false and 1 is true, an AND gate functions the same as the logical AND operator. If both inputs are true, the output is true – otherwise it is false.

OR gate: The OR gate behaves as the logical inclusive OR. Here, the output is true if either of the inputs are true. Only if both the inputs are false is the output false.

XOR gate: Working the same as the logical EITHER/OR, an XOR gate’s output is true only if one of the inputs are true – not both. The output is always false for the other combinations.

NOT gate: The NOT gate is a logical inverter that has one input and reverses the logic state.

NAND gate: A NAND gate’s output is only false when both inputs are true. This gate works as the logical operation AND, followed by negation.

NOR gate: A combination OR gate followed by an inverter, the NOR gate’s output is only true when both inputs are false.

XNOR gate: An XNOR gate’s output is true when both inputs are the same, and false when different. It is a combination XOR gate followed by an inverter.

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 Price (Price shown excludes VAT) Part Details Brand Stock Logic Function Mounting Type Number Of Elements Number of Inputs per Gate Schmitt Trigger Input Package Type Pin Count Logic Family Input Type Maximum Operating Supply Voltage Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL Minimum Operating Supply Voltage Maximum Low Level Output Current Output Type Height Propagation Delay Test Condition Width Automotive Standard Length Dimensions Minimum Operating Temperature Maximum Operating Temperature