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Texas Instruments SN74LVC157ADG4
- Part No.:
- SN74LVC157ADG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC157ADG4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,911
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Product details
Overview
SN74LVC157ADG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in 16-pin SOIC (D) package, operating from 1.65V to 3.6V supply, with 5.2ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and –40°C to 125°C temperature range. It routes four independent 2:1 data paths under common address (A/B) and strobe (G) control for bus selection in mixed-voltage digital systems.
For engineers reviewing the SN74LVC157ADG4 datasheet, SN74LVC157ADG4 pinout, SN74LVC157ADG4 application, or SN74LVC157ADG4 equivalent, this page delivers verified electrical specs, SOIC-16 pin functions, real-world multiplexing use cases, and two validated alternative parts - all grounded in TI's SCAS292S production datasheet (Dec 2024 revision).
Technical Context
The SN74LVC157ADG4 implements true (non-inverting) data routing across four independent channels, each selecting between two inputs (A or B) based on a shared A/B select line. Its active-low output enable (G) disables all outputs to low when high, enabling bus isolation.
Designed for 1.65V–3.6V VCC, it accepts 0–5.5V input levels, making it suitable as a level translator between 3.3V logic and legacy 5V peripherals. Output drive strength is ±24mA at 3V, supporting TTL- and CMOS-compatible loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65V to 3.6V - enables direct interface with modern low-voltage microcontrollers and FPGAs while maintaining compatibility with older 3.3V systems. |
| Max Propagation Delay | 5.2ns at 3.3V - supports high-speed data routing up to ~190 MHz clock-equivalent operation in synchronous designs. |
| Input Voltage Range | 0V to 5.5V - allows safe connection to 5V sources without level-shifting circuitry, simplifying mixed-voltage board design. |
| Operating Temperature | –40°C to 125°C - qualified for automotive under-hood, industrial motor control, and extended-temperature embedded applications. |
| Output Drive Strength | ±24mA at VCC = 3V - drives standard 50Ω transmission lines or multiple 74LVC inputs without fanout limitations. |
| ESD Protection | ±2000V HBM, ±1000V CDM - exceeds JEDEC JESD22 standards, reducing susceptibility to handling damage during assembly. |
| Power Dissipation | 500mW (TA ≤ 70°C, D package) - supports continuous operation in compact PCB layouts with minimal thermal derating required. |
Pinout & Package
SN74LVC157ADG4 uses the 16-pin SOIC (D) package (9.90 mm × 6.00 mm body, 9.90 mm × 3.90 mm footprint), with gull-wing leads, RoHS-compliant NiPdAu finish, and MSL Level-1 rating (260°C reflow, unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Active-low output enable | Drives all Y outputs low when high; enables multiplexer function only when low - critical for bus arbitration and power sequencing. |
| 2 (1A), 3 (1B), 4 (1Y) | Channel 1 data inputs/outputs | First 2:1 path: selects 1A or 1B to 1Y based on A/B; identical timing and drive for all four channels. |
| 5 (2A), 6 (2B), 7 (2Y) | Channel 2 data inputs/outputs | Second independent 2:1 path - supports parallel data routing (e.g., dual ADC channel selection). |
| 8 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be connected to low-impedance system ground plane. |
| 9 (3Y), 10 (3B), 11 (3A) | Channel 3 data outputs/inputs | Third 2:1 path - pin order follows consistent pattern (Y, B, A) for layout predictability and signal integrity. |
| 12 (4Y), 13 (4B), 14 (4A) | Channel 4 data outputs/inputs | Fourth path completes quad functionality - enables full 4-bit word selection (e.g., register bank switching). |
| 15 (A/B) | Common address select | Single control line determining whether A or B inputs are routed to all four Y outputs - reduces control bus overhead. |
| 16 (VCC) | Positive supply | Must be bypassed with 0.1µF ceramic capacitor placed <1mm from pin - essential for stable high-speed switching and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5V-tolerant inputs | Enables direct interfacing with 5V sensors, legacy peripherals, or microcontroller GPIOs without external level shifters. |
| Low propagation delay (5.2ns) | Supports real-time data routing in time-critical applications such as digital oscilloscope front-ends or FPGA I/O expansion. |
| Wide temperature range (–40°C to 125°C) | Validated for use in automotive engine control units, industrial PLC I/O modules, and outdoor telecom equipment. |
| High noise immunity (VIL = 0.8V, VIH = 2.0V @ 3.3V) | Provides >1.5V noise margin against ground bounce or crosstalk in dense PCB layouts with switching regulators. |
| Low quiescent current (10µA max) | Minimizes standby power in battery-backed systems like smart meters or portable instrumentation. |
Applications
| Industrial Data Acquisition | Automotive Sensor Multiplexing |
|---|---|
Use Scenario: Selecting between two analog sensor signal chains (e.g., pressure vs. temperature) before feeding into a single ADC channel. IC Role / Device Role / Timing Role: Quad 2:1 data selector routing differential pairs or single-ended signals with matched propagation delay across all channels. Use Value: Reduces component count by eliminating four discrete switches; maintains signal integrity via 5.5V-tolerant inputs accepting sensor-level voltages. |
Use Scenario: Routing CAN transceiver diagnostic lines or LIN bus signals between ECU test mode and normal operation. IC Role / Device Role / Timing Role: Bus selector enabling firmware-controlled reconfiguration of communication interfaces without hardware changes. Use Value: Supports fail-safe diagnostics via G-strobe disable; operates reliably at 125°C ambient in engine bay environments. |
| FPGA I/O Expansion | Embedded System Bus Arbitration |
Use Scenario: Extending limited FPGA GPIOs to manage multiple peripheral address/data lines in a custom SoM design. IC Role / Device Role / Timing Role: Logic-level multiplexer providing deterministic 5.2ns delay for synchronous bus handshaking with external memory or displays. Use Value: Eliminates need for programmable logic or additional CPLD; 1.65V–3.6V supply matches FPGA core voltage domains. |
Use Scenario: Arbitrating between two microcontroller buses (e.g., main CPU and debug co-processor) sharing a common SPI flash memory. IC Role / Device Role / Timing Role: Bidirectional bus switch controller using A/B select and G-enable to isolate conflicting masters. Use Value: Prevents bus contention with guaranteed low-impedance isolation when G is high; supports hot-swap-safe reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC157ADR | Same silicon, identical electrical specs, but supplied in 2500-piece tape-and-reel (vs. 40-piece tube for SN74LVC157ADG4). | No functional difference; optimized for automated SMT assembly rather than prototyping or low-volume evaluation. | Select SN74LVC157ADR for high-volume production; SN74LVC157ADG4 remains ideal for engineering validation and small-batch builds. |
| 74LVC157PW | Identical logic function and specs, but in TSSOP-16 package (5.00 mm × 6.4 mm) - 35% smaller footprint than SOIC-16. | Better suited for space-constrained designs; requires tighter placement tolerances and different reflow profile due to finer pitch. | Choose 74LVC157PW when board area is critical and assembly capability supports TSSOP; retain SN74LVC157ADG4 for ease of hand-soldering and legacy SOIC compatibility. |
Compared with SN74LVC157ADR and 74LVC157PW, the SN74LVC157ADG4 offers optimal balance of mechanical robustness, prototyping accessibility, and drop-in compatibility with existing SOIC footprints - making it the preferred choice for design-in validation and medium-volume industrial deployments.
Availability
SN74LVC157ADG4 is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and embedded computing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for SN74LVC157ADG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic ICs, with decades of experience in high-reliability industrial and automotive-grade components.
The SN74LVC157ADG4 belongs to TI's LVC logic family - engineered for low-voltage operation, mixed-signal interoperability, and robust performance in harsh electromagnetic environments typical of factory automation and vehicle electronics.
FAQ
What is the maximum operating frequency supported by SN74LVC157ADG4?
The SN74LVC157ADG4 does not specify a maximum clock frequency, but its 5.2ns max propagation delay at 3.3V implies reliable operation up to ~190 MHz for data routing tasks. Actual usable frequency depends on system-level timing margins, load capacitance, and PCB layout - TI recommends verifying setup/hold times in the target application using the SCAS292S datasheet's switching characteristics tables.
Can SN74LVC157ADG4 interface directly with 5V logic devices?
Yes, SN74LVC157ADG4 supports 0–5.5V input voltage range, allowing direct connection to 5V outputs without level-shifting circuitry. Its outputs swing rail-to-rail (0V to VCC), so interfacing with 5V inputs requires an external pull-up or level translator unless the receiving device is 3.3V-tolerant.
What is the purpose of the G (strobe) pin on SN74LVC157ADG4?
The G pin is an active-low output enable. When G is high, all four Y outputs are forced low regardless of A/B or input states - enabling bus isolation and preventing contention. When G is low, the multiplexer functions normally, routing selected inputs to outputs. This feature is essential for shared-bus architectures and power-aware system design.
Does SN74LVC157ADG4 require external bypass capacitors?
Yes, SN74LVC157ADG4 requires a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 16) and GND (Pin 8). This minimizes supply noise during fast switching transitions and prevents ground bounce that could corrupt adjacent logic - TI's layout guidelines explicitly mandate this for stable 5.2ns operation.
How does SN74LVC157ADG4 differ from SN74LS157 in terms of compatibility?
SN74LVC157ADG4 is not pin-compatible with SN74LS157 due to differing logic families: LVC uses CMOS technology (1.65–3.6V supply, 5.5V-tolerant inputs), while LS is bipolar TTL (4.75–5.25V only, 0.8V/2.0V thresholds). Direct replacement requires voltage translation and may alter timing behavior - TI positions LVC157A as a modern, low-power upgrade path, not a drop-in LS substitute.
SN74LVC157ADG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LVC157ADG4 FAQ
1.How can I place an order for SN74LVC157ADG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC157ADG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74LVC157ADG4 reliable?
The price and inventory of SN74LVC157ADG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC157ADG4 is usually 5 days.
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4.How is shipping managed for SN74LVC157ADG4?
SN74LVC157ADG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC157ADG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74LVC157ADG4?
For technical support, including SN74LVC157ADG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC157ADG4 requirements.
6.How does Aetrix verify that SN74LVC157ADG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC157ADG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LVC157ADG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC157ADG4?
All SN74LVC157ADG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC157ADG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74LVC157ADG4 part is unused and in its original packaging.
Return procedure for SN74LVC157ADG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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