Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Texas Instruments SN74LVC257ABQBR

Name: SN74LVC257ABQBR
Brand: Texas Instruments
SKU: SN74LVC257ABQBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74LVC257ABQBR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-WFQFN Exposed Pad

Datasheet:: SN74LVC257ABQBR.pdf

Description:: QUADRUPLE 2-LINE TO 1-LINE DATA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,024

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74LVC257ABQBR 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 max propagation delay at 3.3V, and enables bus-organized signal routing in systems such as network switches and I/O expanders.

For engineers reviewing the SN74LVC257ABQBR datasheet, SN74LVC257ABQBR pinout, SN74LVC257ABQBR application, or SN74LVC257ABQBR equivalent, key selection criteria include its 16-pin WQFN (BQB) package, 3-state output control via active-low OE, voltage translation capability between 3.3V and 5V domains, and guaranteed operation across –40°C to +85°C.

Technical Context

The SN74LVC257ABQBR 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 the logic level of A/B, while OE independently places all outputs in high-impedance state when high.

Its CMOS design ensures balanced drive strength (±24mA at 3V), low dynamic power (15.5pF typical C_pd), and robust noise immunity - including <0.8V typical ground bounce (V_OLP) and >2V typical undershoot (V_OHV) at 3.3V - making it suitable for high-density, noise-sensitive digital buses.

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 without level-shifting circuitry
Input Voltage Tolerance	Up to 5.5V - allows safe connection to legacy 5V drivers in mixed-supply systems
Max Propagation Delay	4.6ns at V_CC = 3.3V - supports >200MHz data switching in timing-critical paths
Output Drive	±24mA at V_CC = 3V - sufficient to drive standard 50Ω transmission lines or multiple CMOS inputs
3-State Leakage	±10μA at V_CC = 3.6V - minimizes bus leakage current when outputs are disabled
ESD Rating	±2000V HBM - meets industrial-grade handling requirements without external protection
Operating Temperature	–40°C to +85°C - qualified for commercial/industrial ambient environments

Pinout & Package

SN74LVC257ABQBR uses a 16-pin WQFN package (BQB) with 3.5mm × 2.5mm body size and exposed thermal pad for enhanced thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14	Data I/O (1A–4B, 1Y–4Y)	Eight bidirectional signal pins: four A/B inputs per channel and four Y outputs; support bidirectional data flow in bus applications
8	GND	Ground reference for logic and power return; must be connected to system ground plane
16	V_CC	Primary power supply (1.65–3.6V); requires local 0.1μF bypass capacitor
15	OE	Active-low output enable - drives all Y outputs to high-impedance when logic high
1 & 2 (top row)	A/B	Global select line - determines whether A or B input is routed to each Y output

Key Features

Feature	Design Value
Wide V_CC range	Operates from 1.65V to 3.6V - compatible with 1.8V, 2.5V, and 3.3V logic families without external regulators
5V-tolerant inputs	Accepts 0–5.5V input signals - eliminates need for discrete level translators in mixed-voltage designs
Low propagation delay	4.6ns max at 3.3V - enables use in high-speed data routing, test equipment, and real-time control loops
3-State outputs with fast enable/disable	5.6ns enable time (t_en) and 4.3ns disable time (t_dis) - reduces bus contention risk during state transitions
High noise immunity	<0.8V typical V_OLP, >2V typical V_OHV - suppresses ground bounce and overshoot in dense PCB layouts

Applications

Network Switch Backplane Interface	I/O Expansion for Microcontroller
Use Scenario: Routing control/status signals between switch ASICs and management processors across multi-layer backplanes. IC Role / Device Role / Timing Role: Data selector enabling dynamic reconfiguration of diagnostic, configuration, or telemetry channels without FPGA logic overhead. Use Value: Reduces PCB layer count by consolidating four independent 2:1 paths into one compact WQFN device, while maintaining signal integrity via 3-state isolation.	Use Scenario: Expanding GPIO count on resource-constrained MCUs for sensor arrays or actuator banks in industrial edge nodes. IC Role / Device Role / Timing Role: Multiplexer translating MCU port pins into shared bidirectional data lanes for peripheral addressing and status readback. Use Value: Enables software-selectable peripheral access using only two control lines (A/B and OE), minimizing firmware complexity and pin usage.
Mixed-Voltage Test Fixture	Motor Driver Control Logic
Use Scenario: Interfacing 5V legacy test instruments with 3.3V DUTs in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Level translator and signal selector allowing programmable routing of stimulus/response signals between voltage domains. Use Value: Eliminates discrete resistor-divider or dedicated level-shifter ICs, reducing BOM cost and board space while preserving timing margins.	Use Scenario: Selecting between position feedback sources (e.g., encoder vs. Hall sensor) or PWM command paths in closed-loop motor controllers. IC Role / Device Role / Timing Role: Real-time signal selector synchronizing feedback acquisition with commutation states under tight timing constraints. Use Value: Provides deterministic sub-5ns path selection critical for maintaining loop stability in high-RPM servo applications.

Network Switch Backplane Interface

I/O Expansion for Microcontroller

Use Scenario: Routing control/status signals between switch ASICs and management processors across multi-layer backplanes.

IC Role / Device Role / Timing Role: Data selector enabling dynamic reconfiguration of diagnostic, configuration, or telemetry channels without FPGA logic overhead.

Use Value: Reduces PCB layer count by consolidating four independent 2:1 paths into one compact WQFN device, while maintaining signal integrity via 3-state isolation.

Use Scenario: Expanding GPIO count on resource-constrained MCUs for sensor arrays or actuator banks in industrial edge nodes.

IC Role / Device Role / Timing Role: Multiplexer translating MCU port pins into shared bidirectional data lanes for peripheral addressing and status readback.

Use Value: Enables software-selectable peripheral access using only two control lines (A/B and OE), minimizing firmware complexity and pin usage.

Mixed-Voltage Test Fixture

Motor Driver Control Logic

Use Scenario: Interfacing 5V legacy test instruments with 3.3V DUTs in automated test equipment (ATE) racks.

IC Role / Device Role / Timing Role: Level translator and signal selector allowing programmable routing of stimulus/response signals between voltage domains.

Use Value: Eliminates discrete resistor-divider or dedicated level-shifter ICs, reducing BOM cost and board space while preserving timing margins.

Use Scenario: Selecting between position feedback sources (e.g., encoder vs. Hall sensor) or PWM command paths in closed-loop motor controllers.

IC Role / Device Role / Timing Role: Real-time signal selector synchronizing feedback acquisition with commutation states under tight timing constraints.

Use Value: Provides deterministic sub-5ns path selection critical for maintaining loop stability in high-RPM servo applications.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC157APWR	Same logic function and 3-state outputs, but in 16-pin TSSOP (PW) package; slightly higher R_θJA (141.8°C/W vs. 98.8°C/W)	Less suitable for thermally constrained, high-density layouts where WQFN thermal pad improves heat dissipation	Choose SN74LVC157APWR if TSSOP footprint compatibility or existing assembly tooling is prioritized over thermal performance.
74LVC257ADBR	Identical electrical specs, but in 16-pin SSOP (DB) package; larger body (6.2mm × 7.8mm) and no exposed thermal pad	Lower I/O density and reduced thermal efficiency limit use in compact, high-power digital subsystems	Choose 74LVC257ADBR only when SSOP is required for legacy board redesign or mechanical clearance constraints.

Compared with SN74LVC157APWR and 74LVC257ADBR, the SN74LVC257ABQBR offers superior thermal performance and smallest PCB footprint among TI's LVC257A variants - critical for space- and thermal-limited embedded designs requiring reliable 3.3V bus multiplexing.

Availability

SN74LVC257ABQBR is available at Aetrix Electronics and suitable for network switches, I/O expanders, and motor driver control systems requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support.

Supply support for SN74LVC257ABQBR 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 and embedded processing technologies, with decades of expertise in logic, interface, and power management ICs.

The SN74LVC257ABQBR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in industrial, communications, and computing applications.

FAQ

What is the maximum input voltage rating for SN74LVC257ABQBR?

The SN74LVC257ABQBR supports input voltages up to 5.5V regardless of V_CC level, enabling direct connection to 5V logic sources without external clamping or level-shifting components. This overvoltage tolerance is specified across the full operating temperature range and applies to all input pins including A/B, 1A–4B, and OE. The SN74LVC257ABQBR maintains this rating while operating from 1.65V to 3.6V V_CC, making it ideal for bridging legacy and modern logic domains.

Does SN74LVC257ABQBR require external pull-up resistors on the OE pin?

Yes - to ensure outputs remain in high-impedance state during power-up or power-down sequences, OE must be tied to V_CC through an external pull-up resistor. The minimum resistance value depends on the driving source's current-sinking capability; TI recommends verifying against the specific driver's I_OL specification. This requirement applies to the SN74LVC257ABQBR in all operating conditions and is critical for preventing bus contention in multi-device systems.

What is the thermal resistance (R_θJA) of SN74LVC257ABQBR in its WQFN package?

The SN74LVC257ABQBR in the BQB (WQFN) package has a junction-to-ambient thermal resistance (R_θJA) of 98.8°C/W under standard JEDEC test conditions. This value assumes proper PCB layout with the exposed thermal pad soldered to a solid copper plane. The SN74LVC257ABQBR's R_θJA is significantly lower than alternative packages like TSSOP (141.8°C/W) or SSOP (82°C/W), reflecting its superior thermal performance in compact, high-power-density applications.

Can SN74LVC257ABQBR be used as a level translator between 5V and 3.3V systems?

Yes - the SN74LVC257ABQBR functions as a bidirectional level translator: its inputs accept 0–5.5V signals while operating from 1.65–3.6V V_CC, and its outputs swing rail-to-rail within the V_CC domain. When V_CC = 3.3V, the SN74LVC257ABQBR safely interfaces 5V microcontrollers with 3.3V FPGAs or ADCs without external components. This capability is inherent to the device's design and verified across temperature and voltage corners.

What are the absolute maximum ratings for SN74LVC257ABQBR supply voltage and operating temperature?

The SN74LVC257ABQBR has an absolute maximum supply voltage (V_CC) of 6.5V and storage temperature range of –65°C to +150°C. Its recommended operating free-air temperature is –40°C to +85°C, consistent with industrial-grade qualification. Exceeding the 6.5V V_CC limit risks permanent damage, and operation outside the rated temperature range may cause functional failure or accelerated parametric drift. These limits apply specifically to the SN74LVC257ABQBR and are not inferred from other LVC257A variants.

SN74LVC257ABQBR 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:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-WQFN (2.5x3.5)

SN74LVC257ABQBR FAQ

1.How can I place an order for SN74LVC257ABQBR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVC257ABQBR 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 SN74LVC257ABQBR reliable?

The price and inventory of SN74LVC257ABQBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257ABQBR is usually 5 days.

3.What payment methods are accepted for SN74LVC257ABQBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC257ABQBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVC257ABQBR?

SN74LVC257ABQBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVC257ABQBR 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 SN74LVC257ABQBR?

For technical support, including SN74LVC257ABQBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257ABQBR requirements.

6.How does Aetrix verify that SN74LVC257ABQBR is sourced from the original manufacturer or authorized distributors?

All SN74LVC257ABQBR 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 SN74LVC257ABQBR meets industry standards.

7.What is the process for return or replacement of SN74LVC257ABQBR?

All SN74LVC257ABQBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257ABQBR, 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 SN74LVC257ABQBR part is unused and in its original packaging.

Return procedure for SN74LVC257ABQBR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…