Signal Switches, Multiplexers, Decoders

This Product Selection Guide contains information to help select products in the Signal Switches, Multiplexers, Decoders category on

Logic-type signal switches, multiplexers, and encoder ICs are used for routing and selection of electrical signals used to represent data in digital format. They differ from similar products designed for use with analog signals in that they are designed to preserve information represented as one of two electrical states, rather than as an infinitely variable quantity within two outer limits.


Type: Indicates the operational mode(s) of a featured IC, which has categorical significance for performance traits such as electrical efficiency.

Circuit: Describes the input to output ratio latch function(s).

Independent Circuits: Indicates the number of identical functional elements that are incorporated into a device. While the inputs and outputs of each element are addressable separately, all elements typically share a common power supply connection.

Current - Output High, Low: The maximum recommended current flow through a device’s output pin. Multiple values reflect ratings that differ depending on the direction of the current flow.

Voltage Supply Source: Describes the type of power supply voltage recommended for circuit operation.

Voltage - Supply: Typically represented by a range, this indicates the low and high voltage limits which one can expect standard operation. Voltages outside this range may damage the device and other system components.

Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.

Mounting Type: Indicates how the device is attached.

Package / Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the suppliers device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.

Supplier Device Package: This is what the manufacturer calls the package of this device. They are manufacturer specific. It is typically best to use the actual dimensions from the datasheets rather than to go by this terminology when designing your circuit.


16-SOIC Decoder/Demultiplexer

MFR PART # 74AHC138D,118
DIGI-KEY PART # 1727-3985-1-ND
DESCRIPTION Decoder/Demultiplexer 1 x 3:8 16-SO


2:1 Multiplexer

4:1 Multiplexer

Schematic symbol courtesy of Scheme-it. Please see their website for more information and symbols.




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If you have any general questions on the specifications for selecting Signal Switches, Multiplexers, Decoders, please reply using the button below. If you have questions on specific Signal Switches, Multiplexers, Decoders please post those questions in the Integrated Circuits (ICs) category.