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Texas Instruments SN74LVC257AWBQBRQ1
- Part No.:
- SN74LVC257AWBQBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
SN74LVC257AWBQBRQ1.pdf
- Description:
- AUTOMOTIVE QUADRUPLE 2-LINE TO 1
- Quantity:
- Payment:
- Shipping:
Inventory:2,815
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Product details
Overview
SN74LVC257AWBQBRQ1 from Texas Instruments is an automotive-qualified 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 and delivering 4.6ns max propagation delay at 3.3V. It enables signal routing in automotive infotainment bus architectures.
For engineers reviewing the SN74LVC257AWBQBRQ1 datasheet, SN74LVC257AWBQBRQ1 pinout, SN74LVC257AWBQBRQ1 application, or SN74LVC257AWBQBRQ1 equivalent, this page delivers verified functional modes, WQFN-16 package details, automotive temperature range (–40°C to 125°C), 3-state output control via active-low OE, and multiplexer select logic (A/B pin) - all critical for bus isolation and voltage-level translation in ADAS domain controllers.
Technical Context
The SN74LVC257AWBQBRQ1 implements four independent 2:1 multiplexers sharing a common select (A/B) and output-enable (OE) control. Each channel routes either input A or B to its Y output based on A/B logic level, while OE asserts high-impedance state on all Y outputs when high.
Its 5.5V-tolerant inputs allow interfacing with legacy 5V logic in mixed-voltage automotive systems, and its 3.6V max VCC with 2V min supports modern low-voltage microcontroller I/O domains. The device meets AEC-Q100 Grade 1 requirements and features ESD protection exceeding ±2000V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 3.6V - compatible with 2.5V/3.3V automotive MCU I/O rails, not 5V supply |
| Input Voltage Tolerance | Up to 5.5V - enables safe connection to 5V sensors or legacy peripherals without level shifters |
| Max Propagation Delay | 4.6ns at VCC = 3.3V - ensures sub-5ns timing margin for 100MHz+ bus arbitration cycles |
| Operating Temperature | –40°C to +125°C - qualified for engine bay and cockpit electronics per AEC-Q100 Grade 1 |
| Output Drive Strength | ±24mA at VCC = 3V - sufficient to drive 50Ω transmission lines or fan-out to 10 LVC loads |
| ESD Rating | ±2000V HBM - exceeds automotive ESD immunity requirements for in-vehicle harness coupling |
| Power Dissipation Cap | 15.5pF at 3.3V - enables accurate dynamic power estimation in thermal-constrained ECUs |
Pinout & Package
SN74LVC257AWBQBRQ1 uses a 16-pin WQFN package (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 |
|---|---|---|
| A/B | Select control input | Low selects 1A/2A/3A/4A; high selects 1B/2B/3B/4B - shared across all four channels |
| OE | Active-low output enable | Drives all Y outputs into high-impedance when high - essential for bus contention avoidance |
| 1A–4A, 1B–4B | Multiplexer data inputs | Eight bidirectional I/O pins accepting 5.5V logic regardless of VCC - supports mixed-voltage signal routing |
| 1Y–4Y | Multiplexer outputs | Four 3-state outputs with controlled VOLP (<0.8V) and VOHV (>2V) - minimizes ground bounce in noisy ECU environments |
| VCC | Power supply | Single 2V–3.6V rail - requires local 0.1μF bypass capacitor adjacent to pin 16 per layout guidelines |
| GND | Ground reference | Pin 8 provides primary return path - must connect to solid ground plane beneath exposed thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for continuous operation at 125°C ambient in safety-critical vehicle subsystems |
| 5.5V-tolerant inputs | Eliminates need for external level translators when interfacing with 5V CAN transceivers or sensor ADCs |
| 3-state outputs with fast enable/disable | ten = 5.6ns and tdis = 4.3ns at 3.3V - reduces bus turnaround time in time-triggered communication protocols |
| Low ground bounce | Typical VOLP < 0.8V at VCC = 3.3V - prevents false logic transitions during simultaneous output switching in multi-channel routing |
| Thermally enhanced WQFN | Exposed thermal pad lowers RθJA to 98.8°C/W - sustains full drive strength under sustained 125°C ECU enclosure conditions |
Applications
| Infotainment Head Unit Bus Multiplexing | ADAS Camera Interface Selection |
|---|---|
Use Scenario: Routing multiple audio codec or display interface signals onto a shared LVDS or MIPI D-PHY bus within a head unit PCB. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer enabling dynamic selection between primary and backup audio sources or display panels. Use Value: Reduces board layer count by consolidating four independent signal paths into one shared physical bus, saving space in space-constrained dash modules. | Use Scenario: Selecting between front-facing and rear-facing camera video streams before feeding to a central vision processor in a surround-view system. IC Role / Device Role / Timing Role: Low-latency signal switch providing sub-5ns propagation delay to preserve pixel clock integrity across camera inputs. Use Value: Enables seamless camera handoff without frame drop during vehicle maneuvering, meeting ASIL-B timing constraints. |
| Body Control Module Signal Translation | Gateway ECU Protocol Bridging |
Use Scenario: Interfacing 5V door lock actuators and window motor drivers with a 3.3V microcontroller in a BCM. IC Role / Device Role / Timing Role: Voltage-tolerant multiplexer acting as bi-directional level shifter for control line routing. Use Value: Eliminates discrete resistor-based level shifters, reducing BOM cost and improving noise immunity on long harness runs. | Use Scenario: Isolating diagnostic CAN FD traffic from standard CAN bus segments during firmware updates in a vehicle gateway. IC Role / Device Role / Timing Role: 3-state-enabled bus switch preventing signal contention during concurrent protocol access. Use Value: Ensures deterministic bus arbitration by physically disconnecting diagnostic traffic from main network during reprogramming sequences. |
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, no exposed thermal pad, RθJA = 73°C/W - higher thermal resistance than WQFN | Lacks AEC-Q100 Grade 1 certification; rated only for commercial temperature range | Prefer SN74LVC257AWBQBRQ1 for under-hood or dashboard-mounted modules requiring extended temperature operation. |
| SN74LVCH16257AQRHBRQ1 | 16-bit version with separate A/B controls per channel, 3.6V max VCC, same WQFN-48 package | Higher pin count and larger footprint - over-specified for 4-channel use cases | Choose SN74LVC257AWBQBRQ1 when board space is constrained and only four 2:1 paths are needed. |
Compared with SN74LVC157AQDRQ1, SN74LVC257AWBQBRQ1 adds automotive qualification and thermal performance; compared with SN74LVCH16257AQRHBRQ1, it offers identical functionality in half the footprint and lower cost - making it optimal for compact, thermally demanding automotive multiplexing tasks.
Availability
SN74LVC257AWBQBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera switching, and body control module designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC257AWBQBRQ1 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 company specializing in analog and embedded processing solutions, with leadership in automotive-grade logic, power management, and signal chain products.
The SN74LVC257AWBQBRQ1 belongs to TI's automotive LVC logic family, designed specifically for robust signal routing in electric and electronic vehicle subsystems where voltage translation, bus isolation, and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum input voltage rating for SN74LVC257AWBQBRQ1?
The SN74LVC257AWBQBRQ1 supports input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V peripherals such as legacy sensors or CAN transceivers without external level-shifting circuitry. This tolerance is specified across the full operating temperature range and is validated per absolute maximum ratings in the official datasheet.
Does SN74LVC257AWBQBRQ1 support hot insertion?
SN74LVC257AWBQBRQ1 does not include explicit hot-insertion protection features such as power-up sequencing control or Ioff. Its 5.5V-tolerant inputs reduce risk during partial power-up, but TI recommends tying OE to VCC via a pullup resistor during power ramp to ensure outputs remain in high-impedance state until supply stabilizes - a practice confirmed in the device's functional description section.
What is the recommended bypass capacitor for SN74LVC257AWBQBRQ1?
Texas Instruments specifies a 0.1μF ceramic capacitor placed as close as possible to the VCC pin (pin 16) and GND (pin 8) for SN74LVC257AWBQBRQ1. This value is validated in layout guidelines to suppress high-frequency noise and maintain stable supply during fast 3-state transitions, especially critical in automotive EMI-prone environments.
How does the A/B select pin function in SN74LVC257AWBQBRQ1?
In SN74LVC257AWBQBRQ1, the A/B pin is a global select control: when low, all four Y outputs route their respective A inputs (1A→1Y, 2A→2Y, etc.); when high, they route B inputs (1B→1Y, 2B→2Y, etc.). This synchronous 4-channel selection simplifies control logic in bus arbitration circuits and is detailed in the device functional modes table.
Is SN74LVC257AWBQBRQ1 pin-compatible with SN74LVC257APWRQ1?
No - SN74LVC257AWBQBRQ1 (WQFN-16, BQB) and SN74LVC257APWRQ1 (TSSOP-16, PW) share identical logic functionality and pin numbering but differ in physical dimensions, thermal pad presence, and soldering requirements. Their land patterns and stencil designs are not interchangeable; PCB layout must be redesigned to accommodate the 3.5mm × 2.5mm WQFN body and exposed thermal pad of SN74LVC257AWBQBRQ1.
SN74LVC257AWBQBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Data Selector/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, Wettable Flank
- Supplier Device Package:
- 16-WQFN (2.5x3.5)
SN74LVC257AWBQBRQ1 FAQ
1.How can I place an order for SN74LVC257AWBQBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC257AWBQBRQ1 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 SN74LVC257AWBQBRQ1 reliable?
The price and inventory of SN74LVC257AWBQBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257AWBQBRQ1 is usually 5 days.
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SN74LVC257AWBQBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC257AWBQBRQ1 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 SN74LVC257AWBQBRQ1?
For technical support, including SN74LVC257AWBQBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257AWBQBRQ1 requirements.
6.How does Aetrix verify that SN74LVC257AWBQBRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC257AWBQBRQ1 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 SN74LVC257AWBQBRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVC257AWBQBRQ1?
All SN74LVC257AWBQBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257AWBQBRQ1, 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 SN74LVC257AWBQBRQ1 part is unused and in its original packaging.
Return procedure for SN74LVC257AWBQBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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