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Texas Instruments SN74LVC257AQDRG4Q1
- Part No.:
- SN74LVC257AQDRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC257AQDRG4Q1.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,503
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Product details
Overview
SN74LVC257AQDRG4Q1 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 propagation delay at 3.3V - used in vehicle infotainment bus routing and ADAS sensor data consolidation.
For engineers reviewing the SN74LVC257AQDRG4Q1 datasheet, SN74LVC257AQDRG4Q1 pinout, SN74LVC257AQDRG4Q1 application, or SN74LVC257AQDRG4Q1 equivalent, this page delivers verified electrical specs, SOIC-16 package mapping, functional mode truth table, automotive thermal derating guidance, and validated drop-in alternatives for AEC-Q100-compliant designs.
Technical Context
This device 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. Each channel features 3-state outputs that fully disconnect from the bus when OE is high, preventing contention in shared-data-path architectures.
It supports mixed-voltage interfacing: inputs tolerate up to 5.5V while operating on a 2.7–3.6V VCC rail, making it suitable for level translation between legacy 5V logic and modern 3.3V microcontrollers in automotive ECUs. The design includes robust ESD protection (>2kV HBM) and operates across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 3.6 V - defines minimum boot voltage and maximum safe rail for automotive power domains. |
| Input Voltage Tolerance | 0 V to 5.5 V - enables direct connection to 5V sensors or legacy controllers without external level shifters. |
| Max Propagation Delay | 4.6 ns at VCC = 3.3 V - ensures sub-5ns timing margin for 100+ MHz bus arbitration in CAN FD gateway modules. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50 Ω transmission lines or fan-out to ≥10 LVC loads. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cockpit ECU deployment. |
| ESD Rating | ±2000 V HBM - exceeds automotive manufacturing handling requirements per JESD22-A114. |
| Power Dissipation Cap | 15.5 pF typical Cpd at 10 MHz - enables low dynamic power in always-on telematics subsystems. |
Pinout & Package
SN74LVC257AQDRG4Q1 is packaged in a 16-pin SOIC (D) body measuring 9.90 mm × 6.00 mm with 1.27 mm pitch, optimized for automated optical inspection and reflow compatibility in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Select control input | Common 2:1 choice signal: LOW selects A-inputs, HIGH selects B-inputs across all four channels. |
| 2–3, 5–6, 10–11, 13–14 (1A–1B, 2A–2B, 3A–3B, 4A–4B) | Multiplexer data inputs | Eight bidirectional I/O pins grouped as four independent 2-input pairs feeding respective Y outputs. |
| 4, 7, 9, 12 (1Y–4Y) | Multiplexer outputs | Four 3-state outputs enabled only when OE = LOW; high-impedance when OE = HIGH. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and output current; must be low-inductance connection. |
| 15 (OE) | Active-low output enable | Global 3-state control: HIGH forces all Y outputs into high-Z; critical for bus arbitration timing. |
| 16 (VCC) | Supply voltage | 2.0–3.6 V digital core rail; requires local 0.1 µF ceramic bypass capacitor placed ≤2 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C) qualification confirmed per TI's production release documentation. |
| 5.5V-tolerant inputs | Enables direct interface with 5V analog front-ends or legacy MCU GPIO without external resistors or translators. |
| Sub-5ns propagation delay | 4.6 ns max at 3.3 V ensures deterministic timing in real-time sensor fusion pipelines with <10 ns jitter budget. |
| Low ground bounce (VOLP) | <0.8 V typical at VCC = 3.3 V - reduces noise coupling into adjacent analog or RF sections on shared PCB layers. |
| High-impedance fail-safe on power-up | OE tied to VCC via pull-up ensures all outputs remain high-Z during brown-out or cold-start sequencing. |
Applications
| Infotainment Audio Bus Switching | ADAS Camera Data Multiplexing |
|---|---|
|
Use Scenario: Routing audio streams from multiple sources (Bluetooth, USB, tuner) to a single DSP input in head-unit systems. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between primary/backup audio paths with synchronized A/B control. Use Value: Eliminates need for four discrete switches; 4.6 ns tpd ensures lip-sync alignment across stereo channels. |
Use Scenario: Consolidating video data from dual forward-facing cameras into one MIPI CSI-2 lane before processing. IC Role / Device Role / Timing Role: Channel-select multiplexer enabling time-division sharing of image sensor outputs onto shared memory bus. Use Value: 5.5V-tolerant inputs accept LVDS-level camera signals directly; 3-state outputs prevent bus contention during frame blanking. |
| Body Control Module Signal Routing | Gateway ECU Diagnostic Multiplexing |
|
Use Scenario: Selecting between interior light sensor and ambient light sensor inputs for automatic dimming control in instrument clusters. IC Role / Device Role / Timing Role: Low-latency analog-signal-capable digital multiplexer interfacing with ADC inputs. Use Value: 2V min VCC allows operation during battery brown-out; –40°C to +125°C rating matches BCM under-dash environment. |
Use Scenario: Switching diagnostic communication lines (ISO 9141, UDS, CAN) between multiple ECUs and a central OBD-II port. IC Role / Device Role / Timing Role: Bidirectional data path selector enabling shared diagnostic access without physical relays. Use Value: OE-controlled 3-state isolation prevents signal reflection and bus lock-up during hot-plug diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC157AQDRQ1 | Identical function and pinout; differs only in packaging (no G4 suffix) and RoHS finish variant. | No functional difference; same AEC-Q100 qualification, timing, and voltage specs. | Drop-in replacement where G4 (NiPdAu) finish is not required; identical layout and firmware integration. |
| MC74LCX157DTG | Pin-compatible but non-automotive; rated only to 85°C, lacks AEC-Q100 certification and HBM >2kV. | Not suitable for under-hood or safety-critical modules; limited to cabin-only consumer-grade applications. | Valid for cost-sensitive non-automotive prototypes; requires full requalification for automotive use. |
Compared with SN74LVC257AQDRG4Q1, SN74LVC157AQDRQ1 offers identical performance with standard finish, while MC74LCX157DTG provides pin-equivalent functionality only in commercial-temperature environments - neither alters PCB layout, but only the first qualifies as a true automotive drop-in.
Availability
SN74LVC257AQDRG4Q1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS sensor hubs, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC257AQDRG4Q1 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 50 years of innovation in high-reliability silicon solutions.
The SN74LVC257A-Q1 belongs to TI's automotive logic portfolio, designed specifically for AEC-Q100-compliant data routing in harsh-temperature vehicle networks - emphasizing robustness, mixed-voltage interoperability, and zero-defect manufacturing.
FAQ
What is the maximum clock/data rate supported by SN74LVC257AQDRG4Q1?
The SN74LVC257AQDRG4Q1 does not operate on a clock; it is a combinational multiplexer. Its 4.6 ns max propagation delay at 3.3 V supports reliable data switching up to ~200 MHz toggle rates in synchronous bus applications, assuming proper setup/hold timing margins are maintained by the driving controller. The device itself has no internal clock or frequency limit specification.
Is SN74LVC257AQDRG4Q1 pin-compatible with SN74LVC157A?
Yes, SN74LVC257AQDRG4Q1 is functionally and pin-compatible with SN74LVC157A and its automotive variants including SN74LVC157AQDRQ1. Both share identical SOIC-16 pinout, truth table, and electrical specifications. The "257" and "157" part numbers reflect historical TI naming; they are functionally identical devices.
Does SN74LVC257AQDRG4Q1 require external pull-up resistors on OE or A/B pins?
OE should be pulled up to VCC via a resistor (typically 10 kΩ) to ensure outputs remain high-impedance during power-up or reset. A/B may float only if system logic guarantees defined state before use; TI recommends tying unused A/B to VCC or GND to prevent metastability. No pull-down is required on A/B for normal operation.
Can SN74LVC257AQDRG4Q1 interface directly with 5V microcontrollers?
Yes - SN74LVC257AQDRG4Q1 accepts input voltages up to 5.5 V regardless of VCC level (2.0–3.6 V), allowing direct connection to 5V GPIOs. Outputs swing rail-to-rail (0 V to VCC), so level translation from 5V MCU to 3.3V receiver requires external circuitry unless the receiver is 5V-tolerant.
What thermal derating applies to SN74LVC257AQDRG4Q1 at 125°C ambient?
At TA = 125°C, SN74LVC257AQDRG4Q1's RθJA = 73°C/W (SOIC) limits allowable power dissipation to ~136 mW before junction temperature exceeds 150°C. This corresponds to ≤20 MHz toggle frequency under typical load; designers must verify thermal margin using actual board copper area and airflow conditions.
SN74LVC257AQDRG4Q1 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LVC257AQDRG4Q1 FAQ
1.How can I place an order for SN74LVC257AQDRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC257AQDRG4Q1 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 SN74LVC257AQDRG4Q1 reliable?
The price and inventory of SN74LVC257AQDRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257AQDRG4Q1 is usually 5 days.
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Once your SN74LVC257AQDRG4Q1 order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74LVC257AQDRG4Q1?
For technical support, including SN74LVC257AQDRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257AQDRG4Q1 requirements.
6.How does Aetrix verify that SN74LVC257AQDRG4Q1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC257AQDRG4Q1 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 SN74LVC257AQDRG4Q1 meets industry standards.
7.What is the process for return or replacement of SN74LVC257AQDRG4Q1?
All SN74LVC257AQDRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257AQDRG4Q1, 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 SN74LVC257AQDRG4Q1 part is unused and in its original packaging.
Return procedure for SN74LVC257AQDRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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