SN74HCT157DE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HCT157 is a quad 2-to-1 data selector/multiplexer from Texas Instruments' HCT CMOS family, offering four independent 2-input multiplexer sections operating from a 5 V supply with TTL-compatible input levels. It provides 5.2 mA output sink current and 150 pF rated load capacitance, packaged in a 16-pin SOIC for data routing, signal selection, and address multiplexing in digital logic systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HCT157DE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HCT157DE4?
- Quad 2-to-1 multiplexer with 4 independent data selector sections
- HCT family: 5 V supply with TTL-compatible input thresholds
- 5.2 mA output sink current for standard CMOS/TTL bus loading
- 150 pF rated load capacitance for stable high-frequency operation
- Common select and strobe inputs for simultaneous 4-channel control
- 16-pin SOIC package for straightforward PCB integration
What is SN74HCT157DE4 used for?
The SN74HCT157 is used in data routing circuits and address multiplexers in embedded systems where two sets of 4-bit input data must be switched to a single output bus based on a common select signal. It is commonly deployed in DRAM row/column address multiplexing, microprocessor bus expansion, and signal selector circuits in industrial controls running at 5 V TTL logic levels. The HCT family's compatibility with TTL input thresholds also makes it ideal for interfacing between legacy TTL-based systems and modern CMOS logic.
What are the specifications of SN74HCT157DE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Family | HCT |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | MULTIPLEXER |
| Max I(ol) | 0.0052A |
| Number of Bits | 2 |
| Number of Functions | 4 |
| Number of Inputs | 2 |
| Number of Outputs | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 40ns |
| Propagation Delay (tpd) | 52ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the SN74HCT157DE4 datasheet?
SN74HCT157DE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HCT157DE4?
Compatible alternatives and drop-in replacements for SN74HCT157DE4:
Multiplexer, HCT Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Multiplexer, HCT Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Multiplexer, HCT Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Multiplexer, HCT Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Multiplexer, HCT Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-SOIC -40 to 85
Multiplexer, HCT Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16
Frequently Asked Questions
How many multiplexer sections does the SN74HCT157 contain, and how are they controlled?
The SN74HCT157 contains 4 independent 2-to-1 multiplexer sections sharing a common select pin and an active-low strobe input. When the strobe is LOW, all 4 sections simultaneously route either input A or input B to their respective outputs based on the select pin state, enabling synchronous switching of 4-bit data words with a single control signal.
Can the SN74HCT157 accept input signals from a 3.3 V CMOS logic source driving a 5 V system?
The SN74HCT157 belongs to the HCT logic family, which uses TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). A 3.3 V CMOS output that swings to at least 2.4 V HIGH and below 0.4 V LOW will be correctly recognized, making the SN74HCT157 suitable as an interface bridge between 3.3 V CMOS signal sources and a 5 V TTL bus environment.
What is the maximum rated load capacitance for the SN74HCT157, and how does this affect signal integrity at higher speeds?
The SN74HCT157 is rated for a load capacitance of up to 150 pF per output. At this capacitance level, the output rise and fall times increase, which limits the maximum operating frequency before signal integrity degrades. For designs running above 20 MHz, designers should minimize trace capacitance or add series damping resistors to reduce ringing and overshoot on the output lines.
In DRAM address multiplexing, how does the SN74HCT157 help reduce pin count between a CPU and memory array?
In DRAM systems, the SN74HCT157 multiplexes row and column addresses onto shared address pins, switching between the two sets under control of the RAS and CAS timing signals. A single SN74HCT157 can multiplex 4 address bits simultaneously, so two or more devices in parallel can handle a full 8-bit or 16-bit address bus, cutting the required address pins between the CPU and DRAM by half.
What output sink current does the SN74HCT157 provide, and is this sufficient to drive standard TTL loads?
The SN74HCT157 provides a maximum output sink current (IOL) of 5.2 mA, which is sufficient to drive standard TTL loads requiring up to 1.6 mA per input (typically 3 standard TTL loads per output). For applications with heavier fanout requirements, a dedicated bus driver or buffer IC with higher drive capability of 24 mA or more should be added downstream.
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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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