SN74LVC257AD Tech Specifications
Texas Instruments - SN74LVC257AD technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74LVC257AD

Product Attribute	Attribute Value
Part Number	SN74LVC257AD
Package	SN74LVC257AD
Description	SN74LVC257AD
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Allelco Certifications	ESD / ISO 9001 / ISO 13485 / ISO 28000

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
RoHs Status	-
Warranty	100% Perfect Functions
Transport port	Hong Kong
Shipping by	DHL / FedEx / UPS / TNT / SF Express
RFQ Email	info@allelco.com

Parts Introduction

Manufacturer Part Number

SN74LVC257AD

Manufacturer

Texas Instruments

Introduction

The SN74LVC257AD is a 4-bit dual 2-to-1 multiplexer with a high-impedance 3-state output. It is designed for use in applications where low power, high speed, and high-density logic functions are required.

Product Features and Performance

4-bit dual 2-to-1 multiplexer with 3-state outputs

High-speed operation: typical propagation delay of 5.5 ns

Low power consumption: typical ICC of 2 μA

Supports single 1.65V to 3.6V power supply

Wide operating temperature range: -40°C to 85°C

Latch-up performance exceeds 100 mA per JESD 78 Class II

Product Advantages

Compact and space-saving design with 16-SOIC package

Versatile functionality for various logic applications

Low power consumption for energy-efficient systems

Wide voltage and temperature range for diverse use cases

Key Reasons to Choose This Product

High-performance multiplexing with low power and fast switching

Reliable and robust design for demanding applications

Compatibility with a wide range of system voltages and environments

Cost-effective solution for space-constrained designs

Quality and Safety Features

ESD protection exceeding 2 kV per JESD 22-A114

Latch-up immunity testing per JESD 78 Class II

Compatibility

Compatible with 3.3V and 5V logic systems

Can be used in a variety of digital electronics and embedded systems

Application Areas

Digital logic circuits

Data acquisition and processing

Embedded systems

Industrial automation and control

Product Lifecycle

The SN74LVC257AD is an active and currently available product from Texas Instruments. There are no direct equivalent or alternative models announced at this time. For the latest information or to inquire about product availability, please contact our website's sales team.

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the SN74LVC257AD multiplexer that influence its use in low-voltage digital designs?: The SN74LVC257AD operates over a supply voltage range of 1.65V to 3.6V, making it suitable for modern low-power and low-voltage systems such as battery-powered devices and mobile electronics. It supports output current levels of up to ±24mA, which allows sufficient drive capability for interfacing with standard logic loads or driving LEDs and small relays without requiring additional buffer stages. These specifications align with the broader 74LVC family’s emphasis on voltage compatibility across generations, ensuring reliable operation when interfacing between 1.8V, 2.5V, and 3.3V systems.

How does the SN74LVC257AD compare to other 4x2:1 multiplexers like the SN74HC257 or SN74LVT257 in terms of power consumption and signal integrity?: The SN74LVC257AD offers lower power consumption than the SN74HC257 due to its LVT (Low-Voltage Transistor) architecture, which reduces static and dynamic power dissipation at 1.65V–3.6V. Unlike the HC series, which typically runs at 2V–6V, the LVC257AD maintains full functionality down to 1.65V, enabling seamless integration into mixed-voltage environments. Compared to the SN74LVT257, which is optimized for 3.3V-to-5V translation, the SN74LVC257AD provides better noise margins at lower voltages and improved ESD protection, though both share similar propagation delay performance under matched load conditions.

Can the SN74LVC257AD be used in high-speed data routing applications, and what factors limit its bandwidth?: While the SN74LVC257AD can support moderate-speed switching—typically up to tens of MHz depending on capacitive loading and trace impedance—it is not designed for high-frequency analog signal routing or GHz-range digital multiplexing. Its maximum switching speed is constrained by internal gate delays (approximately 3–5 ns typical), package parasitics, and load capacitance. For applications requiring precise timing or sub-nanosecond transitions, dedicated high-speed switches or transmission gates should be considered instead. However, for standard microcontroller peripherals and control signal selection, the SN74LVC257AD performs adequately.

What considerations apply when cascading multiple SN74LVC257AD units to expand input channels beyond four?: Cascading SN74LVC257AD multiplexers requires careful attention to address decoding, enable pin management, and propagation delay accumulation. Since each device has one common output, chaining them demands separate select lines or an external decoder to avoid contention. Additionally, cumulative skew from multiple ICs can degrade timing margins in synchronous systems. To maintain signal integrity, keep interconnections short and minimize capacitive loading on the output line. Using Schottky diodes or level shifters may be necessary if interfacing across different voltage rails, even within the 1.65V–3.6V tolerance.

Is the SN74LVC257AD suitable for industrial temperature ranges, and how does packaging affect thermal performance?: The SN74LVC257AD operates reliably from -40°C to +85°C, meeting industrial-grade requirements. Its 16-pin SOIC package (3.9mm width) provides adequate thermal dissipation for typical logic-level currents, but continuous operation near 85°C with full output current may necessitate layout considerations such as copper pours or thermal vias to prevent localized heating. Given its MSL rating of 1 and RoHS3 compliance, it is ideal for automotive edge cases where environmental robustness and regulatory adherence are critical.

How should enable pins be managed on unused SN74LVC257AD multiplexer channels to ensure stable operation?: Unused enable inputs (OE) on the SN74LVC257AD should be tied high or low based on system configuration to prevent floating states that could cause excessive power draw or unintended conduction. Pull-up resistors are unnecessary if directly connected to VCC or GND via zero-ohm resistors; however, adding small decoupling capacitors near the OE pins helps suppress transient noise during power-up sequences. Avoid leaving any select or data lines unconnected unless properly terminated, as this can induce shoot-through currents or oscillation in high-impedance nodes.

What impact does supply voltage variation have on the logic thresholds of the SN74LVC257AD?: The SN74LVC257AD maintains consistent TTL/CMOS-compatible logic levels across its entire 1.65V–3.6V supply range. At 1.8V, input high threshold remains below 0.7×VCC, preserving backward compatibility with 5V-tolerant systems. Output high voltage scales proportionally with VCC, ensuring reliable recognition by downstream devices even at the lowest operating point. This behavior eliminates the need for level-shifting circuitry when connecting subsystems powered at different voltages within the supported range, simplifying board design and reducing component count.

Can the SN74LVC257AD interface safely with 5V logic signals without damage?: Yes, the SN74LVC257AD features 5V-tolerant inputs, meaning it can accept up to 5.5V on any input pin even when powered at 3.3V or lower. This allows direct connection to legacy 5V microcontrollers or sensors without external clamping circuits. However, outputs driven at 3.3V will not reach full 5V swing, so bidirectional communication requires either open-drain configuration or a dedicated translator if both sides must recognize true high states. Input protection diodes prevent latch-up under brief overvoltage conditions, enhancing system resilience.

How does the propagation delay of the SN74LVC257AD vary with load capacitance and supply voltage?: Propagation delay decreases slightly with higher supply voltage due to increased transistor gain, but remains relatively flat across the 2.7V–3.6V range. Under light loads (≤10pF), delay is approximately 3.5ns; this increases nonlinearly with capacitive loading, reaching ~8ns at 100pF. At 1.65V, delay rises by roughly 20% compared to 3.3V operation, which must be factored into timing budgets for asynchronous handshaking or synchronous bus arbitration. Designers should consult TI’s timing diagrams for specific load conditions relevant to their application.

What precautions are necessary when using the SN74LVC257AD in hot-swap or live insertion scenarios?: Hot insertion into powered backplanes risks violating absolute maximum ratings if inputs exceed VCC+0.5V. Although the device includes ESD protection, sustained exposure to out-of-range voltages can compromise reliability. To mitigate this, series current-limiting resistors (e.g., 100Ω) and TVS diodes are recommended on input lines. Additionally, power sequencing should ensure the SN74LVC257AD is powered before or simultaneously with its inputs to avoid reverse-current flow through parasitic diodes into the supply rail.

Why might a designer choose the SN74LVC257AD over discrete transistor-based multiplexers for a space-constrained PCB?: The SN74LVC257AD integrates four independent 2:1 multiplexers in a single 16-SOIC package, offering significant board area savings versus discrete solutions requiring multiple transistors, resistors, and drivers. It also eliminates layout-induced skew and simplifies firmware development by providing standardized select and enable interfaces. With built-in ESD protection and robust I/O structure, it reduces BOM complexity and improves manufacturability—critical advantages in high-volume consumer or industrial electronics where footprint minimization and yield optimization drive cost efficiency.

Does the SN74LVC257AD support bidirectional data flow, and under what conditions?: No, the SN74LVC257AD is unidirectional only—data flows from selected inputs to the common output. Bidirectional transfer requires two SN74LVC257AD units or a separate transceiver IC. Each channel operates as a simple switch controlled by select lines, making it unsuitable for USB or I²C-style bidirectional protocols without additional buffering. For applications like keyboard matrix scanning or sensor multiplexing where direction is fixed, the SN74LVC257AD suffices, but flexibility limitations must be accounted for in protocol design.

How does moisture sensitivity affect storage and handling of tube-packaged SN74LVC257AD components?: Classified as MSL 1, the SN74LVC257AD has unlimited shelf life under normal ambient conditions (≤30°C, ≤80% RH). Tube packaging protects against surface contamination and static discharge during transport. However, prolonged exposure to humid environments prior to soldering may require baking per J-STD-033 if moisture exceeds recommended limits. Since it is lead-free and RoHS3 compliant, standard reflow profiles apply, but users should verify flux compatibility to avoid residue-related failures in high-reliability assemblies.

What role do the select lines play in preventing crosstalk between channels of the SN74LVC257AD?: Select lines (S0, S1) determine which pair of inputs feeds the common output, and their stable state prevents multiple channels from conducting simultaneously. Proper pull-up/down biasing ensures only one channel is active at a time, minimizing cross-channel leakage. Isolation between channels is further enhanced by the internal architecture’s use of complementary pass gates rather than shared pull-down networks, reducing capacitive coupling under switching transients. Still, physical separation and ground plane planning remain important in dense layouts to suppress electromagnetic interference.

Can the SN74LVC257AD be used in redundant signal path architectures for fault tolerance?: Yes, the SN74LVC257AD can support dual-input redundancy by routing primary and backup signals through separate channels, with software or hardware logic selecting the active path based on error detection. The fast switching capability and predictable delay allow quick failover without disrupting downstream timing. However, designers must ensure both inputs are valid before switching to avoid glitches. External comparators or watchdog timers may enhance reliability in safety-critical systems like medical monitoring or avionics.

What are the implications of using the SN74LVC257AD in battery-backed real-time clock circuits?: In low-power RTC applications, the SN74LVC257AD consumes minimal quiescent current (<1µA typical), making it suitable for coin-cell or supercapacitor-backed designs. Its ability to operate down to 1.65V ensures continued functionality during brown-out events. When used to switch between backup and main power sources, the device’s low ON-resistance minimizes voltage drop, preserving battery life. Ensure enable logic is coordinated with the RTC’s wake-up sequence to prevent unintended power drain through inactive channels.

How does the SN74LVC257AD perform when driving inductive loads such as relays or solenoids?: Driving inductive loads directly is not recommended due to risk of voltage spikes exceeding absolute maximum ratings during turn-off transients. A flyback diode across the relay coil is mandatory to clamp inductive kickback. Even with protection, the SN74LVC257AD’s output current may be insufficient for large coils without external drivers. For such applications, consider using the SN74LVC257AD solely for signal selection, while employing a MOSFET or Darlington array to handle the actual load switching.

What documentation resources does Texas Instruments provide to aid in implementing the SN74LVC257AD in functional prototypes?: Texas Instruments supplies detailed datasheets, SPICE models, IBIS files, and application notes covering timing analysis, PCB layout guidelines, and example schematics. The SN74LVC257AD evaluation module and reference designs demonstrate best practices for enable sequencing and noise reduction. Engineers are advised to review the user guide for pinout clarification and verify simulation results against real-world test conditions, especially when operating near voltage extremes or high-speed edges.

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

Write a Review

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America	United States	5
America	Brazil	7
Europe	Germany	5
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	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
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Middle East	Israel	6

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2.00kg-3.00kg	USD$50.00 - USD$100.00

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
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SN74LVC257AD

Texas Instruments
41D-SN74LVC257AD

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SN74LVC257AD - Texas Instruments

Specifications

Parts Introduction

Manufacturer Part Number

Manufacturer

Introduction

Product Features and Performance

Product Advantages

Key Reasons to Choose This Product

Quality and Safety Features

Compatibility

Application Areas

Product Lifecycle

Frequently Asked Questions(FAQ)

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

Solid diode for power rectification. Works well in switching circuits.

Compact FPGA with good performance. Suitable for basic signal processing tasks.

Reliable I/O expander. Works well in embedded control applications.

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

Write a Review

Shipment

Delivery Time

Delivery Cost

Delivery Method

QC (Quality Warranty)

Payment Support

Packaging

Electrostatic Discharge Protection and Handling

Certifications & Memberships

SN74LVC257AD

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Please refer to the English Version as our Official Version.