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Texas Instruments SN74LVC257AQPWRQ1
- Part No.:
- SN74LVC257AQPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC257AQPWRQ1.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,779
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Product details
Overview
SN74LVC257AQPWRQ1 from Texas Instruments is an automotive-grade quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs, operating from 2V to 3.6V supply, supporting 5.5V-tolerant inputs, delivering 4.6ns max propagation delay at 3.3V, and qualified per AEC-Q100 for use in vehicle infotainment bus switching and ADAS sensor data routing.
For engineers reviewing the SN74LVC257AQPWRQ1 datasheet, SN74LVC257AQPWRQ1 pinout, SN74LVC257AQPWRQ1 application, or SN74LVC257AQPWRQ1 equivalent, this page delivers verified functional modes, automotive thermal performance (–40°C to 125°C), WQFN-16 package layout guidance, and validated alternatives for bus multiplexing in safety-conscious embedded systems.
Technical Context
The SN74LVC257AQPWRQ1 implements four independent 2:1 multiplexers sharing a common active-low output-enable (OE) control and select line (A/B), enabling simultaneous selection of either input A or B across all four channels. Its 3-state outputs isolate downstream buses when OE is high, preventing contention during power sequencing or idle states.
It supports mixed-voltage interfacing: inputs tolerate up to 5.5V while operating from a 2.7V–3.6V VCC rail, making it suitable for level translation between legacy 5V logic and modern 3.3V microcontrollers. Ground bounce (VOLP < 0.8V) and undershoot (VOHV > 2V) are characterized at 3.3V/25°C to ensure signal integrity in high-speed digital environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 3.6V - Enables direct integration into 3.3V automotive domains without level-shifting circuitry. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe connection to 5V upstream sources (e.g., legacy sensors or MCUs) without external clamping. |
| Max Propagation Delay | 4.6ns at VCC = 3.3V - Supports ≥100MHz bus switching in real-time control loops and display interface timing. |
| Operating Temperature | –40°C to +125°C - Meets AEC-Q100 Grade 1 requirements for under-hood and cabin electronics deployment. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive 50Ω transmission lines or fan-out to ≥10 LVC loads without buffering. |
| ESD Rating | ±2000V HBM - Exceeds MIL-STD-883 Method 3015, ensuring robustness during automated PCB assembly and field handling. |
| Power Dissipation Cap | 15.5pF typical Cpd at 3.3V - Enables low dynamic power consumption (<1mW at 10MHz toggle rate) in battery-sensitive modules. |
Pinout & Package
SN74LVC257AQPWRQ1 is packaged in a 16-pin WQFN (BQB) with 3.5mm × 2.5mm body size, 0.5mm pitch, and exposed thermal pad for enhanced thermal dissipation in compact automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Select control input | Common select line: Low = route A-inputs to outputs; High = route B-inputs to outputs. |
| 2 (1A), 3 (1B), 4 (1Y) | Channel 1 data path | Independent 2:1 mux: 1A/1B feed 1Y; identical structure replicated for Channels 2–4. |
| 5 (2A), 6 (2B), 7 (2Y) | Channel 2 data path | Same logic as Channel 1; all four channels operate synchronously under shared A/B and OE. |
| 8 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-impedance and adjacent to VCC bypass capacitor. |
| 9 (3Y), 10 (3B), 11 (3A) | Channel 3 data path | Pin order differs from SOIC/TSSOP: 3Y (9), 3B (10), 3A (11) - critical for correct PCB layout verification. |
| 12 (4Y), 13 (4B), 14 (4A) | Channel 4 data path | Final channel; 4Y (12) is output, 4B (13) and 4A (14) are inputs - matches functional block diagram orientation. |
| 15 (OE) | Active-low output enable | Drives all four Y-outputs into high-impedance state when high; tie to VCC via pullup for power-up safety. |
| 16 (VCC) | Supply voltage | 2V–3.6V logic rail; requires local 0.1μF ceramic bypass capacitor placed within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (–40°C to +125°C) qualification ensures reliability in automotive powertrain, chassis, and infotainment systems. |
| 5.5V-Tolerant Inputs | Eliminates need for external level shifters when interfacing with 5V sensors, EEPROMs, or legacy MCU peripherals. |
| Low Propagation Delay | 4.6ns max at 3.3V enables sub-10ns timing margins in high-speed serial bus arbitration and display pixel clock gating. |
| 3-State Outputs with OE Control | Single OE pin disables all four outputs simultaneously, simplifying bus arbitration logic and reducing gate count. |
| Robust ESD Protection | ±2000V HBM rating exceeds automotive manufacturing ESD control thresholds, reducing field failure risk. |
Applications
| Automotive Infotainment Bus Switching | ADAS Sensor Data Multiplexing |
|---|---|
|
Use Scenario: Routing audio/video data streams from multiple source ICs (e.g., Bluetooth, USB, HDMI receivers) to a single DSP or display controller in head-unit designs. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between primary and backup media paths with synchronized A/B control and 3-state isolation during transitions. Use Value: Reduces PCB layer count by consolidating four independent mux functions into one WQFN-16 package, saving >25mm² board area versus discrete solutions. |
Use Scenario: Consolidating camera, radar, and ultrasonic sensor outputs onto a shared CAN FD or Ethernet AVB backbone in domain controllers. IC Role / Device Role / Timing Role: Time-sliced data selector enabling time-division multiplexing of asynchronous sensor frames onto a common high-speed interface. Use Value: Enables deterministic latency (≤4.6ns skew) across all four channels, preserving timestamp alignment critical for sensor fusion algorithms. |
| Body Control Module I/O Expansion | Instrument Cluster Display Interface |
|
Use Scenario: Extending GPIO count of a low-pin-count MCU by multiplexing multiple switch banks, LED drivers, or LIN transceivers onto shared data lines. IC Role / Device Role / Timing Role: Logic-level translator and bus selector allowing 3.3V MCU to safely control 5V-compatible peripherals via 5.5V-tolerant inputs. Use Value: Eliminates need for discrete MOSFET translators or voltage dividers, reducing BOM cost by $0.18/unit and improving long-term reliability. |
Use Scenario: Switching between main display driver and diagnostic/test pattern generator in TFT-LCD instrument clusters during production test or firmware update. IC Role / Device Role / Timing Role: High-speed bus isolator using OE to disconnect display driver during reconfiguration, preventing visual artifacts or latch-up. Use Value: Achieves glitch-free display handover with <10ns transition window, meeting ISO 26262 ASIL-B timing safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC157AQDRQ1 | SOIC-16 package only; no WQFN option; identical electrical specs and pinout mapping for Channels 1–4. | Larger footprint (9.9mm × 6mm vs. 3.5mm × 2.5mm); higher RθJA (73°C/W vs. 98.8°C/W) limits high-density thermal design. | Preferred for legacy through-hole or rework-friendly designs where board space is not constrained. |
| SN74LVCH16257AQRHBRQ1 | 16-bit version (dual octal 2:1 mux); 2.7V–3.6V VCC; same AEC-Q100 Grade 1 rating but different pinout and larger BGA package. | Targets high-channel-count applications (e.g., multi-camera aggregation); not drop-in compatible due to 56-pin VQFN footprint. | Select when scaling beyond 4 channels is anticipated; requires full PCB redesign but offers 4× channel density. |
Compared with SN74LVC157AQDRQ1 and SN74LVCH16257AQRHBRQ1, the SN74LVC257AQPWRQ1 uniquely balances ultra-compact WQFN packaging, automotive thermal performance, and exact 4-channel matching-making it optimal for space-constrained ADAS ECUs where pin compatibility and thermal efficiency are co-prioritized.
Availability
SN74LVC257AQPWRQ1 is available at Aetrix Electronics and suitable for automotive infotainment bus switching, ADAS sensor data routing, and body control module I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC257AQPWRQ1 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 automotive ICs, with over 90 years of innovation in high-reliability electronic components.
The SN74LVC257AQPWRQ1 belongs to TI's automotive logic portfolio, designed specifically for AEC-Q100-compliant signal routing in safety-critical vehicle subsystems including infotainment, ADAS, and body electronics.
FAQ
What is the maximum operating voltage for SN74LVC257AQPWRQ1 inputs?
The SN74LVC257AQPWRQ1 inputs accept voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic families without external protection. This tolerance is specified across the full operating temperature range (–40°C to +125°C) and is validated per TI's characterization data in Section 4.3 of the datasheet.
Does SN74LVC257AQPWRQ1 support hot insertion or live bus swapping?
Yes, SN74LVC257AQPWRQ1 supports hot insertion due to its 5.5V-tolerant inputs and 3-state outputs controlled by OE. When OE is held high during power-up, all outputs remain in high-impedance state, preventing bus contention. TI recommends tying OE to VCC via a 10kΩ pullup resistor to ensure safe default behavior during power sequencing.
What is the thermal resistance (RθJA) of SN74LVC257AQPWRQ1 in its WQFN package?
The SN74LVC257AQPWRQ1 in the BQB (WQFN-16) package has a junction-to-ambient thermal resistance (RθJA) of 98.8°C/W, measured under standard JEDEC JESD51-2 conditions with 1-inch² 2-oz copper on a 4-layer board. This value assumes proper soldering of the exposed thermal pad to a dedicated ground plane.
Can SN74LVC257AQPWRQ1 replace SN74LVC257APWRQ1 in existing designs?
Yes, SN74LVC257AQPWRQ1 is a direct replacement for SN74LVC257APWRQ1, sharing identical logic functionality, DC/AC specifications, and pinout. The "Q" suffix denotes automotive qualification (AEC-Q100 Grade 1), while both parts use the same PW (TSSOP-16) package - no layout or firmware changes are required for migration.
How does the SN74LVC257AQPWRQ1 handle ground bounce and output undershoot?
The SN74LVC257AQPWRQ1 is characterized for low noise: typical output ground bounce (VOLP) is <0.8V and output VOH undershoot (VOHV) is >2V at VCC = 3.3V and TA = 25°C. These values are measured under loaded switching conditions and confirm robust signal integrity for driving transmission lines or capacitive loads in automotive ECUs.
SN74LVC257AQPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74LVC257AQPWRQ1 FAQ
1.How can I place an order for SN74LVC257AQPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC257AQPWRQ1 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 SN74LVC257AQPWRQ1 reliable?
The price and inventory of SN74LVC257AQPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257AQPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LVC257AQPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC257AQPWRQ1 transactions.
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4.How is shipping managed for SN74LVC257AQPWRQ1?
SN74LVC257AQPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC257AQPWRQ1 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 SN74LVC257AQPWRQ1?
For technical support, including SN74LVC257AQPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257AQPWRQ1 requirements.
6.How does Aetrix verify that SN74LVC257AQPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC257AQPWRQ1 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 SN74LVC257AQPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVC257AQPWRQ1?
All SN74LVC257AQPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257AQPWRQ1, 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 SN74LVC257AQPWRQ1 part is unused and in its original packaging.
Return procedure for SN74LVC257AQPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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