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Texas Instruments SN74LVC157ADT
- Part No.:
- SN74LVC157ADT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC157ADT.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:839
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Product details
Overview
SN74LVC157ADT from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in 16-pin SOIC package, operating from 1.65V to 3.6V supply, with propagation delay as low as 3.0ns 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, used in bus multiplexing, signal routing, and level translation in mixed-voltage digital systems.
For engineers reviewing the SN74LVC157ADT datasheet, SN74LVC157ADT pinout, SN74LVC157ADT application, or SN74LVC157ADT equivalent, key selection criteria include its 3.3V-compatible logic family, 5.5V-tolerant input capability, low propagation delay across voltage/temperature, output drive strength up to ±24mA, and SOIC-16 packaging for legacy PCB compatibility and hand-soldering feasibility.
Technical Context
The SN74LVC157ADT implements four independent 2:1 multiplexer channels sharing one address select (A/B) and one active-low output enable (G). When G is high, all Y outputs are forced low; when G is low, each Yn selects between An and Bn based on A/B state. Inputs accept voltages up to 5.5V regardless of VCC, enabling robust interfacing with 5V logic in 3.3V systems.
Its LVC (Low-Voltage CMOS) process ensures rail-to-rail output swing, low ground bounce (<0.8V typical VOLP), and undershoot immunity (>2V typical VOHV) at 3.3V operation. The device supports three temperature grades: commercial (–40°C to 85°C), extended (–40°C to 125°C), and military (–55°C to 125°C); SN74LVC157ADT is qualified for the extended grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65V to 3.6V - enables direct integration into 3.3V I/O domains without level shifters |
| Propagation Delay (tpd) | 3.0ns max at VCC = 3.3V, TA = 25°C - supports >150MHz data switching in critical timing paths |
| Input Voltage Tolerance | Up to 5.5V - allows safe connection to 5V sources without external clamping or translation |
| Output Drive Strength | ±24mA at VCC = 3.0V - sufficient to drive multiple LVC/LVT inputs or short PCB traces |
| Operating Temperature | –40°C to 125°C - qualified for automotive under-hood and industrial control environments |
| ESD Rating | ±2000V HBM - meets JEDEC JESD22-A114 standard for robust handling in assembly |
| Power Dissipation | 500mW max at TA ≤ 70°C (SOIC package) - supports continuous operation without heatsinking |
Pinout & Package
SN74LVC157ADT uses a 16-pin SOIC (D) package measuring 9.90 mm × 6.00 mm (body: 9.90 mm × 3.90 mm), with gull-wing leads and RoHS-compliant NiPdAu plating. Thermal resistance RθJA is 118.1°C/W, requiring moderate PCB copper area for thermal management at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | G (Strobe) | Active-low global output enable; high forces all Y outputs low regardless of A/B or data inputs |
| 2–3, 5–6, 10–11, 13–14 | 1A/1B, 2A/2B, 3A/3B, 4A/4B | Eight independent data inputs - two per channel, selectable via A/B |
| 4, 7, 9, 12 | 1Y, 2Y, 3Y, 4Y | Four buffered, non-inverting outputs - each reflects selected A or B input when G is low |
| 8 | GND | Digital ground reference - must be connected to system ground plane with low-inductance path |
| 15 | A/B | Common address select - determines whether A or B input is routed to each Y output |
| 16 | VCC | Positive supply - bypassed with 0.1µF ceramic capacitor placed within 3mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| 5.5V-tolerant inputs | Enables direct interface with 5V logic in 3.3V systems without external level translators |
| Low propagation delay | 3.0ns typical at 3.3V allows use in high-speed data routing and real-time control loops |
| Wide temperature operation | –40°C to 125°C rating supports deployment in automotive engine control units and industrial PLCs |
| High noise immunity | Typical VOLP < 0.8V and VOHV > 2V at 3.3V reduce false triggering in noisy environments |
| Low quiescent current | ICC ≤ 10µA at VCC = 3.6V minimizes standby power in battery-backed or energy-sensitive designs |
Applications
| Industrial PLC I/O Multiplexing | Automotive Body Control Module |
|---|---|
Use Scenario: Consolidating multiple sensor inputs (e.g., door switches, seatbelt sensors) onto shared microcontroller GPIO lines. IC Role / Device Role / Timing Role: Data selector routing discrete status signals to MCU via time-multiplexed bus, synchronized with controller scan cycle. Use Value: Reduces required MCU pin count by 4× while maintaining deterministic 3ns switching latency per channel. |
Use Scenario: Managing redundant CAN transceiver enable signals and diagnostic LED drivers across multiple vehicle zones. IC Role / Device Role / Timing Role: Level-translating and selecting between 5V legacy diagnostics and 3.3V MCU control signals under ECU supervision. Use Value: Eliminates need for discrete MOSFET translators; 5.5V-tolerant inputs tolerate battery transients up to 16V. |
| Test Equipment Signal Routing | Embedded System Bus Expansion |
Use Scenario: Switching between calibration reference voltages and DUT signals in automated test fixtures. IC Role / Device Role / Timing Role: Precision analog multiplexer front-end with digital control, where low crosstalk and fast settling are critical. Use Value: Sub-5ns tpd ensures synchronization with 200MHz sampling clocks; SOIC-16 allows manual rework during fixture validation. |
Use Scenario: Expanding limited SPI or parallel bus lines to support additional peripherals (e.g., EEPROM, ADC, display driver). IC Role / Device Role / Timing Role: Bidirectional data path selector enabling time-shared access to shared memory or peripheral interfaces. Use Value: Enables dual-device arbitration using single strobe (G) line, reducing FPGA or MCU resource usage by 75% vs. discrete gates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV157ADR | LV family: wider 2.0V–5.5V VCC range but higher tpd (6.5ns min at 3.3V); no 5.5V input tolerance | Preferred where 5V supply is available and lower speed suffices; unsuitable for 5V-to-3.3V translation | Choose SN74LV157ADR only if system operates at ≥4.5V or requires LV-specific noise margins |
| 74AHC157PW | AHC family: 2.0V–5.5V VCC, 5.5V-tolerant inputs, but slower (7.5ns min at 4.5V); TSSOP-16 package only | Better for 5V systems; lacks extended temperature qualification (–40°C to 125°C not guaranteed) | Choose 74AHC157PW only for cost-sensitive 5V-only designs where SOIC footprint is not required |
Compared with SN74LV157ADR and 74AHC157PW, the SN74LVC157ADT uniquely combines 1.65V–3.6V operation, 5.5V-tolerant inputs, sub-5ns speed, and extended temperature qualification - making it the sole option for compact, thermally constrained 3.3V systems requiring mixed-voltage interoperability.
Availability
SN74LVC157ADT is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle assurance, and SOIC-16 footprint compatibility.
Supply support for SN74LVC157ADT 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 connectivity technologies, with over 90 years of innovation in high-reliability components.
The SN74LVC157ADT belongs to TI's LVC logic family, designed specifically for low-voltage, high-speed digital interfacing in space-constrained, thermally demanding applications such as automotive ECUs and industrial controllers.
FAQ
What is the maximum input voltage the SN74LVC157ADT can tolerate?
The SN74LVC157ADT accepts input voltages up to 5.5V regardless of VCC level, enabling safe interfacing with 5V logic families in 3.3V systems without external protection. This specification is verified per absolute maximum ratings in the official TI datasheet SCAS292S, and applies to all input pins (A/B, 1A–4B, G) under normal operating conditions.
Does the SN74LVC157ADT support operation at 1.8V supply?
Yes, the SN74LVC157ADT is fully specified for 1.65V to 3.6V VCC operation. At 1.8V, it delivers guaranteed tpd ≤13.5ns (max), VIH ≤1.17V, and VIL ≥0.63V per Section 4.4 of the datasheet, making it suitable for ultra-low-power 1.8V microcontroller interfaces and portable electronics.
What is the thermal performance of the SN74LVC157ADT in SOIC package?
The SN74LVC157ADT in SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 118.1°C/W. At 500mW max power dissipation and 25°C ambient, junction temperature reaches ~61°C - well within safe limits. Derating begins above 70°C at 8mW/K, requiring minimal copper pour for most applications.
Can unused inputs on the SN74LVC157ADT be left floating?
No. All unused inputs on the SN74LVC157ADT must be tied to VCC or GND to prevent undefined logic states and increased ICC. TI explicitly recommends this in Section 4.3 and Section 7.2.1 of the datasheet; floating inputs cause excessive current draw and potential oscillation due to CMOS threshold sensitivity.
Is the SN74LVC157ADT pin-compatible with older 74LS157 devices?
No. While functionally equivalent as a quadruple 2:1 multiplexer, the SN74LVC157ADT uses different pin assignments: G (strobe) is on Pin 1, A/B on Pin 15, and VCC on Pin 16 - unlike 74LS157 which places VCC on Pin 16 but uses different signal mapping and lacks 5.5V-tolerant inputs. PCB redesign is required for replacement.
SN74LVC157ADT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN74LVC157ADT FAQ
1.How can I place an order for SN74LVC157ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC157ADT 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 SN74LVC157ADT reliable?
The price and inventory of SN74LVC157ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC157ADT is usually 5 days.
3.What payment methods are accepted for SN74LVC157ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC157ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC157ADT?
SN74LVC157ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC157ADT 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 SN74LVC157ADT?
For technical support, including SN74LVC157ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC157ADT requirements.
6.How does Aetrix verify that SN74LVC157ADT is sourced from the original manufacturer or authorized distributors?
All SN74LVC157ADT 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 SN74LVC157ADT meets industry standards.
7.What is the process for return or replacement of SN74LVC157ADT?
All SN74LVC157ADT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC157ADT, 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 SN74LVC157ADT part is unused and in its original packaging.
Return procedure for SN74LVC157ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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