SN74HC157NS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74HC157NS is a quadruple 2-to-1 data multiplexer from Texas Instruments in the HC CMOS logic family, operating from 2 V to 6 V supply with four independent single-bit select channels. It routes one of two 4-bit data buses to the output using a common select pin. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74HC157NS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quadruple 2-to-1 multiplexer selecting among two independent 4-bit data sources with a single shared SELECT pin for simplified control
- HC CMOS logic family compatibility supporting 2 V to 6 V supply operation and direct interfacing to TTL and CMOS logic families
- 16-pin DIP form factor enabling straightforward breadboard prototyping and DIP-socket integration in data routing and bus switching circuits
Applications
The SN74HC157NS is used to switch between two 4-bit data sources in digital systems such as microprocessor address/data multiplexing, bus arbitration, and test-vector injection circuits. Its single-select-pin architecture reduces control signal count when routing two competing 4-bit buses to a single destination, ideal for dual-port memory interfaces and FPGA I/O expansion. The HC family supply range makes it compatible with both 3.3 V and 5 V mixed-logic environments.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC157NS:
Multiplexer, HC/UH Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Multiplexer, HC/UH Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Multiplexer, HC/UH Series, 4-Func, 2 Line Input, 1 Line Output, Inverted Output, CMOS, PDSO16
Frequently Asked Questions
How many data inputs and outputs does SN74HC157NS provide, and how is the selection made?
The SN74HC157NS provides 4 independent 2-to-1 multiplexer channels, giving 8 data inputs (4 per source) and 4 outputs. A single shared SELECT pin chooses which of the two 4-bit input buses (A or B) is routed to the outputs, allowing an entire 4-bit word to be switched simultaneously with one logic signal in digital bus-routing designs.
Which supply voltages does SN74HC157NS support, and how does it interface with 3.3 V logic?
The SN74HC157NS operates from 2 V to 6 V supply, covering both 3.3 V and 5 V system rails. In a 3.3 V system, its HC CMOS inputs recognise standard CMOS voltage levels while its outputs swing to within millivolts of the rail, enabling direct connection to 3.3 V microcontrollers and FPGAs without level-shifting resistors in most signal-routing applications.
When is SN74HC157NS a practical alternative to SN74HC257 in bus designs?
The SN74HC157NS uses a non-inverting, totem-pole output stage, whereas the SN74HC257 provides tri-state outputs. When bus sharing with multiple drivers is not needed—for example in a dedicated 4-bit multiplexer feeding a single destination—the SN74HC157NS is simpler and eliminates the output-enable timing concerns associated with tri-state bus contention in point-to-point data routing.
What package does SN74HC157NS come in, and what is the pin count?
The SN74HC157NS is housed in a 16-pin DIP package with 2.54 mm lead pitch, making it directly compatible with breadboards and standard DIP-16 sockets. The 16-pin count accommodates the 8 data inputs, 4 outputs, SELECT, ENABLE, VCC, and GND signals of the quadruple 2-to-1 multiplexer without requiring any external decoding components.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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