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Texas Instruments SN74LVC257ADT
- Part No.:
- SN74LVC257ADT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC257ADT.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,325
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Product details
Overview
SN74LVC257ADT from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs, designed for 1.65V–3.6V VCC operation. It supports mixed-voltage interfacing (inputs tolerate up to 5.5V), delivers 4.6ns max propagation delay at 3.3V, and enables bus-organized signal routing in compact digital systems such as I/O expanders and network switches.
For engineers reviewing the SN74LVC257ADT datasheet, SN74LVC257ADT pinout, SN74LVC257ADT application, or SN74LVC257ADT equivalent, key selection criteria include its 3-state output control, voltage translation capability across 3.3V/5V domains, low ground bounce (<0.8V), and compatibility with SOIC-16 packaging for legacy board layouts.
Technical Context
The SN74LVC257ADT implements four independent 2:1 multiplexers sharing a common active-low output-enable (OE) input and a single select line (A/B) that determines whether each Y output passes A or B input. Its CMOS design ensures balanced drive strength and rail-to-rail output swing within VCC limits.
It operates across industrial temperature range (–40°C to +85°C), supports 10 ns/V input transition rate, and features latch-up immunity >250 mA per JESD17. The device's overvoltage-tolerant inputs allow direct connection to 5V logic while powered from 1.65V–3.6V supplies-enabling seamless level translation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables use in modern low-voltage systems including battery-powered and mixed-supply designs. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct interface with legacy 5V logic without level shifters. |
| Max Propagation Delay | 4.6ns at 3.3V - Supports high-speed data routing in timing-critical applications like telecom infrastructure. |
| Output Drive | ±24mA at 3V - Sufficient to drive multiple LVC loads or moderate capacitive buses. |
| 3-State Output Control | Active-low OE pin - Enables bus arbitration and prevents contention in shared-data-path architectures. |
| ESD Protection | ±2000V HBM - Meets industrial robustness requirements for handling and assembly. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and networking equipment. |
Pinout & Package
SN74LVC257ADT is packaged in a 16-pin SOIC (D package), body size 9.90 mm × 3.90 mm, with standard 1.27 mm pitch. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Select control | Low = route A-inputs to outputs; High = route B-inputs to outputs. |
| 2–3, 5–6, 10–11, 13–14 (1A/1B, 2A/2B, 3A/3B, 4A/4B) | Multiplexer data inputs | Four independent 2-input pairs feeding corresponding Y outputs. |
| 4, 7, 9, 12 (1Y, 2Y, 3Y, 4Y) | 3-state multiplexer outputs | Driven only when OE is low; high-impedance otherwise for bus isolation. |
| 8 (GND) | Ground reference | Return path for all internal logic and output current. |
| 15 (OE) | Output enable | Active-low global control - disables all outputs simultaneously to prevent bus contention. |
| 16 (VCC) | Power supply | Supplies core logic and output drivers; bypass capacitor required near this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation capability | 5.5V-tolerant inputs allow interoperability between 3.3V logic and legacy 5V systems without external translators. |
| High-speed switching | 4.6ns max tpd at 3.3V enables use in sub-200MHz data paths with tight timing margins. |
| Low ground bounce | Typical VOLP < 0.8V at 3.3V reduces noise coupling into shared ground planes during output transitions. |
| Robust ESD immunity | ±2000V HBM rating ensures reliability during PCB handling and automated assembly processes. |
| Bus-friendly 3-state outputs | Simultaneous OE control allows clean insertion/removal of signals onto multi-drop data buses. |
Applications
| Network Switch Data Path | I/O Expander Interface |
|---|---|
Use Scenario: Routing control-plane or management traffic between multiple PHY interfaces and a central switch fabric controller. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between redundant or alternate data lanes under software or hardware control. Use Value: Reduces PCB trace count by consolidating dual-lane sources into single-lane destinations while maintaining signal integrity at 100+ Mbps. | Use Scenario: Expanding GPIO count on microcontrollers with limited native I/O, especially in industrial PLC modules. IC Role / Device Role / Timing Role: Signal selector enabling dynamic reconfiguration of peripheral connections (e.g., sensor vs actuator banks). Use Value: Eliminates need for discrete logic or FPGA-based expansion, lowering BOM cost and firmware complexity. |
| Cable Modem Termination System | Motor Driver Control Logic |
Use Scenario: Selecting between upstream/downstream data streams or diagnostic test modes in DOCSIS-compliant CMTS hardware. IC Role / Device Role / Timing Role: Multiplexer managing bidirectional packet flow across RF front-end and baseband processor interfaces. Use Value: Supports hot-swappable module configurations and field-upgradable firmware paths without hardware redesign. | Use Scenario: Routing PWM or direction signals from MCU to multiple half-bridge gate drivers in multi-axis motor control boards. IC Role / Device Role / Timing Role: Signal selector enabling dynamic assignment of control outputs to different motor phases or braking states. Use Value: Enables flexible motor sequencing and fault-isolation schemes using minimal external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC157AD | Same function but lacks 5.5V-tolerant inputs; max VI = VCC + 0.3V. | Suitable only in pure 3.3V systems; cannot interface directly with 5V logic. | Choose SN74LVC157AD only if system uses uniform 3.3V signaling and cost is prioritized over flexibility. |
| 74LVC257PW | TSSOP-16 package (5.00 mm × 4.40 mm); identical electrical specs and pinout. | Better thermal performance (RθJA = 141.8°C/W vs 118.1°C/W) but requires rework for SOIC footprints. | Choose 74LVC257PW for space-constrained designs where PCB real estate outweighs layout compatibility. |
Compared with SN74LVC157AD and 74LVC257PW, SN74LVC257ADT uniquely combines 5.5V input tolerance with SOIC-16 mechanical compatibility-making it optimal for retrofitting legacy 5V systems or upgrading existing industrial boards without footprint changes.
Availability
SN74LVC257ADT is available at Aetrix Electronics and suitable for network switches, I/O expanders, and motor driver control circuits requiring stable component supply across extended production lifecycles.
Supply support for SN74LVC257ADT 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 industrial, automotive, and communications markets.
The SN74LVC257ADT belongs to TI's LVC logic family-designed specifically for low-voltage, high-speed, mixed-signal interfacing in space- and power-constrained industrial and telecom equipment.
FAQ
What is the maximum input voltage the SN74LVC257ADT can tolerate?
The SN74LVC257ADT accepts input voltages up to 5.5V regardless of VCC level, enabling direct connection to 5V logic families while operating from as low as 1.65V. This overvoltage tolerance is confirmed in Section 5.3 of the official datasheet and eliminates the need for external level-shifting circuitry in mixed-voltage systems. The SN74LVC257ADT maintains full functionality and parametric compliance under these conditions.
Does the SN74LVC257ADT support 3.3V-only operation?
Yes, the SN74LVC257ADT is fully specified for 3.3V operation (VCC = 3.3V ±0.3V), delivering 4.6ns max propagation delay, ±24mA output drive, and guaranteed 3-state behavior. All recommended operating conditions-including VIH/VIL thresholds, IOH/IOL, and switching characteristics-are validated at 3.3V in TI's SCAS294Q datasheet. The SN74LVC257ADT performs reliably in standard 3.3V digital systems without derating.
What is the function of the A/B pin on the SN74LVC257ADT?
The A/B pin on the SN74LVC257ADT is a global select control that determines which input pair drives each output: when A/B is low, all Y outputs reflect their corresponding A inputs (1A→1Y, etc.); when high, they reflect B inputs (1B→1Y, etc.). This synchronous 4-channel selection is implemented in hardware with no internal latching-ensuring deterministic routing aligned with A/B state. The SN74LVC257ADT uses this pin to minimize control lines versus discrete 2:1 mux implementations.
Can the SN74LVC257ADT be used in automotive applications?
The SN74LVC257ADT is not AEC-Q100 qualified and is rated for industrial temperature range (–40°C to +85°C), not automotive (–40°C to +125°C). While its electrical specs meet many automotive subsystem requirements, TI does not certify or guarantee its use in safety-critical or engine-bay environments. For automotive designs, engineers should consider AEC-Q100–qualified alternatives or perform full qualification testing. The SN74LVC257ADT remains appropriate for non-safety automotive infotainment or body-control modules operating within its rated temperature envelope.
How does the SN74LVC257ADT handle unused inputs?
All unused inputs on the SN74LVC257ADT must be tied to a valid logic level-either VCC or GND-to prevent floating nodes that cause increased ICC, erratic switching, or EMI. TI explicitly recommends this in Section 5.3 and Application Note SCBA004. Leaving inputs unconnected risks undefined functional states and violates recommended practice. The SN74LVC257ADT's CMOS inputs have high impedance, making them especially susceptible to noise-induced misbehavior if left floating.
SN74LVC257ADT 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:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LVC257ADT FAQ
1.How can I place an order for SN74LVC257ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC257ADT 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 SN74LVC257ADT reliable?
The price and inventory of SN74LVC257ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257ADT is usually 5 days.
3.What payment methods are accepted for SN74LVC257ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC257ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC257ADT?
SN74LVC257ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC257ADT 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 SN74LVC257ADT?
For technical support, including SN74LVC257ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257ADT requirements.
6.How does Aetrix verify that SN74LVC257ADT is sourced from the original manufacturer or authorized distributors?
All SN74LVC257ADT 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 SN74LVC257ADT meets industry standards.
7.What is the process for return or replacement of SN74LVC257ADT?
All SN74LVC257ADT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257ADT, 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 SN74LVC257ADT part is unused and in its original packaging.
Return procedure for SN74LVC257ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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