Logic - Signal Switches, Multiplexers, Decoders

Part Number	Description / PDF	Quantity
72V8981JG Renesas Electronics America	IC MULTIPLEXER 1 X 4:4 44PLCC	0
54LS153LM	MULTIPLEXER, LS SERIES, 2 FUNC,	561
74HC153PW-Q100J Nexperia	IC MULTIPLEXER 2 X 4:1 16TSSOP	0
SN74AHC138DRE4 Texas Instruments	IC DECODER/DEMUX 1X3:8 16SOIC	0
CD4532BM96 Texas Instruments	IC PRIORITY ENCOD 1 X 8:3 16SOIC	74
SNJ54S157W Texas Instruments	54S157 QUADRUPLE 2-LINE TO 1-LIN	10
SN74CBTK16245DLR Texas Instruments	IC BUS SWITCH 8 X 1:1 48SSOP	3000
MC14515BCPG	IC DECODER/DEMUX 1X4:16 24DIP	0
SN74CBT3245CDBQR Texas Instruments	IC BUS SWITCH 8 X 1:1 20SSOP	154109
MAX321CPA Analog Devices, Inc.	DUAL-SUPPLY, SPST ANALOG SWITCH	0
DG441EJ	QUAD SPST ANALOG SWITCH	1188
SN74CBT16811CDGVR Texas Instruments	IC BUS SWITCH 12 X 1:1 56TVSOP	4449
74CBTLV3125QG Renesas Electronics America	IC BUS SWITCH 1 X 1:1 16QSOP	41240
SN74HC257DT Texas Instruments	IC MULTIPLEXER 4 X 2:1 16SOIC	1000
SN74CBTLV16800DLR Texas Instruments	IC BUS SWITCH 10 X 1:1 48SSOP	5000
MAX309EUE Analog Devices, Inc.	DUAL 8-CHANNEL, ANALOG MUX	246
MAX4695EUB Analog Devices, Inc.	SPDT ANALOG SWITCH IN THIN QFN	3900
MAX4610ASD Analog Devices, Inc.	QUAD, SPST ANALOG SWITCH	1629
SN74HC251DG4 Texas Instruments	IC MULTIPLEXER 1 X 8:1 16SOIC	0
74HC238PW,118 Nexperia	IC DECODER/DEMUX 1X3:8 16TSSOP	3216

Logic - Signal Switches, Multiplexers, Decoders

1. Overview

Signal switches, multiplexers, and decoders are fundamental logic ICs used to manage signal routing and data selection in electronic systems. Signal switches control the flow of electrical signals, multiplexers select between multiple input signals, and decoders convert encoded signals into specific outputs. These components are critical in modern technologies such as telecommunications, computing, and industrial automation, enabling efficient data handling and system design simplification.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Signal Switches	Digital/analog switches with on/off control	Audio routing, power management
Multiplexers (MUX)	2:1 to 16:1 channel selection, data bus sharing	Network switches, sensor data aggregation
Decoders	Binary-to-decimal, BCD-to-7-segment conversion	Memory address decoding, display drivers

3. Structure and Composition

These ICs typically use CMOS or TTL technology with standard packages like DIP, SOP, and QFN. Internal components include transistor arrays, logic gates, and channel control circuits. For example, a 4-channel analog switch integrates four independent switching elements in a single package with common control lines.

4. Key Technical Specifications

Parameter	Description	Importance
On-resistance (R_ON)	Resistance in conducting state	Impacts signal integrity
Bandwidth	Maximum signal frequency supported	Determines high-speed capability
Channel count	Number of independent paths	System scalability
Power consumption	Quiescent current and switching loss	Battery life consideration
Propagation delay	Signal transmission time	Critical for timing-sensitive systems

5. Application Areas

Telecommunications: Signal routing in base stations
Automotive: Sensor signal selection in ECUs
Consumer Electronics: HDMI switch boxes
Industrial: PLC signal conditioning
Computing: Memory address decoding in CPUs

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI	SN74CB3Q3245	10- R_ON, 2.3V-3.6V supply
Analog Devices	ADG1412	4-channel switch, 165MHz bandwidth
NXP	74HC151	8:1 multiplexer, 70MHz operation
STMicroelectronics	CD4028BE	BCD-to-decimal decoder, 18V rating

7. Selection Guidelines

Channel requirements: Match input/output count needs
Signal type: Choose analog/digital switches accordingly
Voltage compatibility: Ensure supply voltage matches system rails
Speed vs. power trade-off: High bandwidth increases consumption
Package constraints: Consider PCB space and thermal requirements

8. Industry Trends

Current developments focus on miniaturization (0.4mm pitch packages), lower on-resistance (<1 ), and integration with level-shifting functions. The rise of IoT and 5G drives demand for high-frequency switches (up to 10GHz) with sub-mW standby power. Advanced CMOS processes enable higher channel density while maintaining signal integrity in automotive-grade temperature ranges.