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Logic type signal switch, multiplexer, 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.
| Select products | Mfr | Description | Package | Supplier Device Package | Mounting Type | Series | Operating Temperature |
|---|---|---|---|---|---|---|---|
![]() CD74HC253E $0.36 | Harris Corporation | IC MULTIPLEXER 2 X 4:1 16DIP | Tube | 16-PDIP | Through Hole | 74HC | -55°C ~ 125°C |
![]() CD74HC253M $0.27 | Harris Corporation | IC MULTIPLEXER 2 X 4:1 16SOIC | Tube | 16-SOIC | Surface Mount | 74HC | -55°C ~ 125°C |
![]() CD74HC253M $0.60 | Texas Instruments | IC MULTIPLEXER 2 X 4:1 16SOIC | Tube | 16-SOIC | Surface Mount | 74HC | -55°C ~ 125°C |
![]() CD74HC253MT $0.60 | Texas Instruments | IC MULTIPLEXER 2 X 4:1 16SOIC | Tape & Reel (TR),Cut Tape (CT) | 16-SOIC | Surface Mount | 74HC | -55°C ~ 125°C |
![]() CD74HC257E $0.39 | Harris Corporation | IC MULTIPLEXER 4 X 2:1 16DIP | Tube | 16-PDIP | Through Hole | 74HC | -55°C ~ 125°C |
![]() CD74HC257E $0.88 | Texas Instruments | IC MULTIPLEXER 4 X 2:1 16DIP | Tube | 16-PDIP | Through Hole | 74HC | -55°C ~ 125°C |
![]() CD74HC257EX $0.44 | Harris Corporation | QUAD 2-INPUT MUX | Bulk | 16-PDIP | Through Hole | 74HC | -55°C ~ 125°C |
![]() CD74HC257M $0.84 | Texas Instruments | IC MULTIPLEXER 4 X 2:1 16SOIC | Tube | 16-SOIC | Surface Mount | 74HC | -55°C ~ 125°C |

Understand tactile switches, PCB and keyboard differences, four-pin wiring, debounce, force, travel and replacement checks for reliable control inputs.
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