SN74HC157DRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74HC157DRE4 is a quad 2-to-1 line data selector and multiplexer in the HC CMOS family, available in a 16-pin SOIC package with 150 pF load capacitance rating and 7.8 mA output sink current. It routes four independent 2-input data channels to four outputs based on a single shared select line, supporting 2 V to 6 V supply operation. Used in data bus routing, address multiplexing, and signal selection in digital logic designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC157DRE4 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
Key Features
- Quad 4-channel 2-to-1 multiplexer selects between two 4-bit data buses with one control pin
- HC CMOS family operates from 2 V to 6 V supply for broad system voltage compatibility
- 16-pin SOIC package (R-PDSO-G16) rated to 150 pF load capacitance
- 7.8 mA output sink current for driving standard logic and backplane loads
- Non-inverting outputs simplify data path verification and signal tracing
- Active-LOW strobe input enables output disable for bus isolation
Applications
The SN74HC157DRE4 is used in digital system data path designs to select between two 4-bit buses — for example, switching between normal data and a diagnostic data source in microprocessor-based boards. It also fits FPGA peripheral expansion circuits where a single-pin select routes either SPI or parallel data to a downstream register array. In embedded control and industrial PLC I/O modules, the quad 2-to-1 structure efficiently implements address or data multiplexing, reducing interconnect wire count between a controller and multiple peripheral groups.
Specifications
| YTEOL | 0 |
| Family | HC |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | MULTIPLEXER |
| Max I(ol) | 0.0078A |
| 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 | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 32ns |
| Propagation Delay (tpd) | 235ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| 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 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC157DRE4:
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
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 SN74HC157DRE4 provide on a single chip?
SN74HC157DRE4 provides 4 independent 2-to-1 multiplexer channels, each with 2 data inputs and 1 output, for a total of 8 data inputs and 4 outputs on the 16-pin SOIC package. A single shared SELECT pin controls all 4 channels simultaneously, and a LOW active strobe input can disable all outputs to a LOW state for bus isolation, supporting 2 V to 6 V HC CMOS supply voltages.
What supply voltage range does SN74HC157DRE4 support and how does this affect system design?
SN74HC157DRE4 operates from 2 V to 6 V, covering 3.3 V and 5 V logic families used in most embedded systems and industrial control boards. At 3.3 V the device operates at slightly reduced output sink current (proportional to supply) while at 5 V it delivers the full 7.8 mA IOL, comfortably driving 150 pF PCB trace capacitances at the propagation delays specified for the HC family — typically below 10 ns at 5 V.
How is SN74HC157DRE4 used to switch between two SPI buses on a microcontroller system?
In a microcontroller design with two SPI masters sharing a common 4-wire SPI slave, SN74HC157DRE4 can route the MOSI, MISO, SCK, and CS lines from either master to the slave using a single GPIO SELECT line, covering all 4 signals with the quad structure in one 16-pin SOIC package. The active-LOW strobe allows the MCU to disable the multiplexer outputs during bus ownership transitions, preventing glitches on the shared SPI lines and supporting clean arbitration between the two 3.3 V or 5 V SPI masters.
What is the output sink current of SN74HC157DRE4 and what loads can it drive?
SN74HC157DRE4 provides a maximum output low-level sink current (IOL) of 7.8 mA at 5 V supply, sufficient to directly drive standard HC, LS, and ALS CMOS/TTL logic inputs rated at 1.6 mA to 4 mA fan-out loading. It can drive PCB trace capacitances up to 150 pF, and for heavier bus loads, a series resistor of 33 Ω or a buffer stage handles the transition to backplane or multi-drop lines beyond 150 pF.
When is SN74HC157DRE4 a better choice than SN74HC257 for data selection?
SN74HC157DRE4 has non-inverting outputs, passing data TRUE from the selected input to the output, while SN74HC257 has 3-state outputs that can be placed in high-impedance mode for wired-OR bus sharing. Designers should choose SN74HC157DRE4 when non-inverting active drive on all selected outputs is required at all times — for instance, when routing select signals between two FPGA banks at 3.3 V without needing bus float — and reserve SN74HC257 for shared-bus topologies where multiple drivers compete on the same net.
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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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