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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74LVC257ADG4

Name: SN74LVC257ADG4
Brand: Texas Instruments
SKU: SN74LVC257ADG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVC257ADG4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74LVC257ADG4.pdf

Description:: IC MULTIPLEXER 4 X 2:1 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74LVC257ADG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs, designed for 1.65V–3.6V V_CC operation. It supports mixed-voltage interfacing (inputs tolerate up to 5.5V), delivers ≤4.6ns propagation delay at 3.3V, and enables bus-organized signal routing in 4-bit data paths - used in telecom infrastructure, network switches, and I/O expander subsystems.

For engineers reviewing the SN74LVC257ADG4 datasheet, SN74LVC257ADG4 pinout, SN74LVC257ADG4 application, or SN74LVC257ADG4 equivalent, key selection criteria include its 3-state output control, voltage translation capability across 3.3V/5V domains, low ground bounce (<0.8V), and SOIC-16 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The SN74LVC257ADG4 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 inputs A or B are routed to each Y output. Its CMOS design ensures balanced drive strength and rail-to-rail output swing within V_CC.

Each multiplexer channel operates with input thresholds scaled to V_CC (e.g., VIH = 0.65×V_CC at 1.65V–1.95V), supports 24mA sink/source at 3V, and maintains high-impedance outputs when OE is high - critical for bus arbitration and hot-swap isolation in multi-master systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V to 3.6V - enables direct integration into modern low-voltage logic domains while maintaining backward compatibility with 3.3V systems.
Input Voltage Tolerance	Up to 5.5V - allows safe connection to legacy 5V logic without level-shifting circuitry.
t_pd Max	4.6ns at V_CC = 3.3V - supports high-speed data routing in timing-critical applications such as packet switching and sensor interface multiplexing.
I_OL/I_OH	±24mA at V_CC = 3V - provides robust drive capability for driving moderate capacitive loads or multiple downstream inputs.
V_O Undershoot/Overdrive	VOHV >2V & VOLP <0.8V at 3.3V - minimizes signal integrity risk during fast transitions on shared buses.
ESD Rating	HBM ±2000V - meets industrial-grade ESD immunity requirements for board-level reliability.
Operating Temp	–40°C to +85°C - qualified for commercial and industrial ambient environments without derating.

Pinout & Package

SN74LVC257ADG4 is packaged in a 16-pin SOIC (D package), body size 9.90 mm × 3.90 mm, with standard JEDEC MS-012AC footprint. Pin 1 is top-left corner (notch-side indicator), and pin numbering follows conventional SOIC convention.

Pin/Terminal	Circuit Role	Design Meaning
1 (A/B)	Select control input	Low selects A-inputs; high selects B-inputs for all four channels - enables synchronized source selection across parallel data lanes.
2–3, 5–6, 10–11, 13–14 (1A–1B, 2A–2B, 3A–3B, 4A–4B)	Data inputs	Eight bidirectional I/O pins grouped as four 2-input pairs - accepts signals from dual sources per channel (e.g., primary/backup sensors or master/slave processors).
4, 7, 9, 12 (1Y–4Y)	Multiplexed outputs	Four 3-state outputs driven by selected A/B inputs - high-impedance state when OE = high prevents bus contention in shared-data-path architectures.
8 (GND)	Ground reference	Primary return path for logic and output current - must be low-inductance connected to system ground plane.
16 (V_CC)	Power supply	Single-supply rail for core logic and output drivers - requires local 0.1µF bypass capacitor placed adjacent to pin.
15 (OE)	Output enable	Active-low control enabling/disabling all Y outputs simultaneously - tied high via pull-up resistor during power-up to ensure defined high-Z state.

Key Features

Feature	Design Value
Wide V_CC range (1.65V–3.6V)	Enables deployment across battery-powered, low-power microcontroller peripherals and 3.3V FPGA I/O banks without external regulators.
5.5V-tolerant inputs	Eliminates need for discrete level translators when interfacing with 5V legacy controllers or analog front-end ICs.
3-state outputs with common OE	Supports time-multiplexed bus sharing among multiple SN74LVC257ADG4 devices or other peripherals on same data lines.
Low ground bounce & undershoot	Reduces switching noise coupling into adjacent signal traces and power rails - critical for mixed-signal PCB layouts.
Latch-up immunity >250mA	Ensures robustness against transient overcurrent events in noisy industrial environments or during hot-plug operations.

Applications

Cable Modem Termination Systems	Network Switches
Use Scenario: Selecting between upstream/downstream data paths or redundant PHY interfaces in DOCSIS-compliant CMTS hardware. IC Role / Device Role / Timing Role: Data selector routing RF-modulated digital streams between MAC-layer processors and physical layer transceivers. Use Value: Enables dynamic reconfiguration of signal paths without FPGA reprogramming or mechanical relays - reducing latency and increasing system uptime.	Use Scenario: Multiplexing management interface signals (e.g., MDIO, I²C, or GPIO) across multiple switch ASICs or PHYs in modular chassis-based switches. IC Role / Device Role / Timing Role: Bus-organized signal router consolidating control lines onto shared backplane traces. Use Value: Reduces PCB layer count and connector pin count while preserving deterministic timing for register access and status polling.
I/O Expanders	Telecom Infrastructure
Use Scenario: Adding parallel GPIO capacity to microcontrollers with limited native I/O, especially where voltage domain bridging (3.3V MCU ↔ 5V peripheral) is required. IC Role / Device Role / Timing Role: Level-translating multiplexer extending host processor's address/data bus to external latch or buffer arrays. Use Value: Doubles effective I/O count using only two control lines (A/B and OE), minimizing MCU pin usage and firmware overhead.	Use Scenario: Signal routing in base station control modules for selecting between primary/backup clock sources, alarm inputs, or diagnostic test points. IC Role / Device Role / Timing Role: Fault-tolerant data selector ensuring continuity of supervisory signals during component failure or maintenance. Use Value: Provides hardware-level redundancy without software intervention - meeting telecom equipment availability targets (>99.999%).

Cable Modem Termination Systems

Network Switches

Use Scenario: Selecting between upstream/downstream data paths or redundant PHY interfaces in DOCSIS-compliant CMTS hardware.

IC Role / Device Role / Timing Role: Data selector routing RF-modulated digital streams between MAC-layer processors and physical layer transceivers.

Use Value: Enables dynamic reconfiguration of signal paths without FPGA reprogramming or mechanical relays - reducing latency and increasing system uptime.

Use Scenario: Multiplexing management interface signals (e.g., MDIO, I²C, or GPIO) across multiple switch ASICs or PHYs in modular chassis-based switches.

IC Role / Device Role / Timing Role: Bus-organized signal router consolidating control lines onto shared backplane traces.

Use Value: Reduces PCB layer count and connector pin count while preserving deterministic timing for register access and status polling.

I/O Expanders

Telecom Infrastructure

Use Scenario: Adding parallel GPIO capacity to microcontrollers with limited native I/O, especially where voltage domain bridging (3.3V MCU ↔ 5V peripheral) is required.

IC Role / Device Role / Timing Role: Level-translating multiplexer extending host processor's address/data bus to external latch or buffer arrays.

Use Value: Doubles effective I/O count using only two control lines (A/B and OE), minimizing MCU pin usage and firmware overhead.

Use Scenario: Signal routing in base station control modules for selecting between primary/backup clock sources, alarm inputs, or diagnostic test points.

IC Role / Device Role / Timing Role: Fault-tolerant data selector ensuring continuity of supervisory signals during component failure or maintenance.

Use Value: Provides hardware-level redundancy without software intervention - meeting telecom equipment availability targets (>99.999%).

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 V_I = V_CC + 0.5V.	Suitable only in homogeneous 3.3V systems; cannot interface directly with 5V logic.	Choose when cost sensitivity outweighs voltage translation need and all connected devices operate at ≤3.6V.
74LVCH16257MTD	16-bit (dual-octuple) version in TSSOP-48; higher channel count, larger footprint.	Used in high-density data bus expansion where 4-channel capacity is insufficient.	Choose when scaling beyond 4-bit multiplexing is required and PCB space allows larger package.

Compared with SN74LVC157AD and 74LVCH16257MTD, the SN74LVC257ADG4 uniquely balances compact SOIC-16 packaging, 5.5V input tolerance, and industrial temperature rating - making it optimal for space-constrained, mixed-voltage telecom and networking modules requiring field-proven reliability.

Availability

SN74LVC257ADG4 is available at Aetrix Electronics and suitable for cable modem termination systems, network switches, and telecom infrastructure requiring stable component supply across extended product lifecycles.

Supply support for SN74LVC257ADG4 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 SN74LVC257ADG4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interface applications - particularly where voltage translation, bus isolation, and deterministic timing are essential.

FAQ

What is the maximum input voltage the SN74LVC257ADG4 can safely accept?

The SN74LVC257ADG4 accepts input voltages up to 5.5V regardless of V_CC level, enabling direct interfacing with 5V logic families without external level shifters. This specification is verified per TI's recommended operating conditions table and applies across the full –40°C to +85°C temperature range. The SN74LVC257ADG4 maintains this tolerance while operating from 1.65V to 3.6V V_CC, making it ideal for mixed-voltage system integration.

Does the SN74LVC257ADG4 support hot-swap or live-insertion scenarios?

Yes, the SN74LVC257ADG4 supports controlled hot-swap operation through its 3-state outputs and robust ESD protection (±2000V HBM). When OE is held high during insertion, all Y outputs remain in high-impedance state, preventing bus contention. Its latch-up immunity (>250mA) and overvoltage-tolerant inputs further enhance resilience during power-rail sequencing mismatches. For reliable operation, OE should be pulled high via a resistor before V_CC stabilizes - a practice confirmed in TI's functional mode documentation for the SN74LVC257ADG4.

What is the propagation delay performance of the SN74LVC257ADG4 at 1.8V V_CC?

At V_CC = 1.8V ± 0.15V, the SN74LVC257ADG4 exhibits a maximum propagation delay (t_pd) of 13.5ns for A/B → Y transitions, as specified in Section 5.7 of the official datasheet. This value is measured under standard load conditions (CL = 50pF) and reflects worst-case timing for timing-critical designs operating at minimum valid supply voltage. The SN74LVC257ADG4 maintains functional operation down to 1.65V, though t_pd increases progressively below 1.8V.

Can the SN74LVC257ADG4 be used as a level translator between 3.3V and 5V logic domains?

Yes, the SN74LVC257ADG4 functions as a unidirectional level translator: its inputs accept 0–5.5V signals while its outputs swing rail-to-rail between GND and V_CC (1.65V–3.6V). When V_CC = 3.3V, it translates 5V inputs to 3.3V-compatible outputs - useful for connecting legacy 5V peripherals to modern low-voltage processors. However, it does not translate in the reverse direction (3.3V-out → 5V-in), and output drive strength remains constrained by V_CC. This behavior is explicitly documented in the SN74LVC257ADG4 feature description and functional block diagram.

What package type and RoHS status does the SN74LVC257ADG4 use?

The SN74LVC257ADG4 uses a 16-pin SOIC (D) package with dimensions 9.90 mm × 6.00 mm, RoHS-compliant with NiPdAu lead finish and Moisture Sensitivity Level 1 (unlimited floor life at ≤30°C/60% RH). It is supplied in tape-and-reel (2500 units/reel) and tube (40 units/tube) formats, with part marking "LVC257A" on the top surface. This package variant is listed as active in TI's official Packaging Information addendum dated July 2026, confirming long-term manufacturing availability for the SN74LVC257ADG4.

SN74LVC257ADG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVC

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

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

SN74LVC257ADG4 FAQ

1.How can I place an order for SN74LVC257ADG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVC257ADG4 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 SN74LVC257ADG4 reliable?

The price and inventory of SN74LVC257ADG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257ADG4 is usually 5 days.

3.What payment methods are accepted for SN74LVC257ADG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC257ADG4 transactions.

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4.How is shipping managed for SN74LVC257ADG4?

SN74LVC257ADG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVC257ADG4 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 SN74LVC257ADG4?

For technical support, including SN74LVC257ADG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257ADG4 requirements.

6.How does Aetrix verify that SN74LVC257ADG4 is sourced from the original manufacturer or authorized distributors?

All SN74LVC257ADG4 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 SN74LVC257ADG4 meets industry standards.

7.What is the process for return or replacement of SN74LVC257ADG4?

All SN74LVC257ADG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257ADG4, 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 SN74LVC257ADG4 part is unused and in its original packaging.

Return procedure for SN74LVC257ADG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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