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HomeProductsIntegrated Circuits (ICs)Logic - Signal Switches, Multiplexers, DecodersSN74LVC257ADB
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SN74LVC257ADB - Texas Instruments

Manufacturer Part Number
SN74LVC257ADB
Manufacturer
Texas Instruments
Allelco Part Number
98D-SN74LVC257ADB
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,120 pcs available, New & Original
Parts Description
MUX, 2 LINE INPUT
Package
16-SSOP
Data sheet
-
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 9120
  • Unit Price: $0.201
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.201 $0.20
200+ $0.078 $15.60
500+ $0.075 $37.50
1000+ $0.074 $74.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

SN74LVC257ADB Tech Specifications
Texas Instruments - SN74LVC257ADB technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74LVC257ADB

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage Supply Source Single Supply
Voltage - Supply 1.65V ~ 3.6V
Type Multiplexer
Supplier Device Package 16-SSOP
Series 74LVC
Package / Case 16-SSOP (0.209", 5.30mm Width)
Product Attribute Attribute Value
Package Bulk
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Independent Circuits 1
Current - Output High, Low 24mA, 24mA
Circuit 4 x 2:1
Base Product Number 74LVC257

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the SN74LVC257ADB multiplexer handle signal integrity when switching between two 4-bit data buses operating at 3.3V?
The SN74LVC257ADB maintains high signal integrity during bus switching due to its low propagation delay of approximately 3.8ns and low output impedance characteristics. With a supply voltage range of 1.65V to 3.6V, it operates effectively at 3.3V while maintaining noise margins compatible with standard logic levels. The device's 24mA output drive capability ensures clean transitions even when driving capacitive loads typical in bus architectures, reducing the risk of signal degradation or timing violations.
In a design requiring hot-swapping capabilities, what considerations should be taken when using the SN74LVC257ADB to select between two memory interfaces?
When implementing hot-swap functionality with the SN74LVC257ADB, designers must account for the device's input leakage current of ±5μA maximum and ensure proper power sequencing. The LVC family's 1.65V minimum supply voltage allows compatibility with lower-voltage systems, but attention must be paid to input thresholds during power-up transients. Adding series resistors (typically 22–100Ω) on control lines helps dampen ringing, while decoupling capacitors near VCC improve stability during dynamic switching events.
What are the key differences between the SN74LVC257ADB and the SN74LVC257APW in terms of thermal performance and board layout requirements?
While both share identical electrical characteristics, the SN74LVC257ADB comes in a 16-SSOP package with a 5.3mm width, whereas the APW variant uses a TSSOP configuration. This results in slightly different thermal profiles under continuous operation—the SSOP typically exhibits marginally better heat dissipation due to larger exposed pads. However, neither requires special heatsinking under normal conditions. Both devices have an MSL rating of 1, but the SSOP’s wider body may require more careful reflow profiling in high-volume manufacturing environments.
Can the SN74LVC257ADB be used safely in automotive-grade temperature applications, and what modifications would be needed beyond the specified -40°C to +85°C range?
The SN74LVC257ADB is rated for industrial temperature operation (-40°C to +85°C), which aligns with many automotive non-powertrain subsystems. For full automotive compliance, additional qualification such as AEC-Q100 certification is required, though this part is not currently qualified. Beyond temperature, long-term reliability under vibration and humidity demands careful PCB layout—avoiding solder joint stress near the narrow 0.209" pitch leads. If extended life beyond 85°C is anticipated, derating of output current by 20% is recommended to maintain margin.
How does the SN7VC257ADB perform in terms of crosstalk suppression when multiple channels switch simultaneously on adjacent lines?
The SN74LVC257ADB exhibits moderate crosstalk immunity due to its CMOS construction and 5.3mm-wide SSOP packaging that provides some isolation between channels. At 3.3V operation, coupled noise between active and inactive paths remains below 100mV under typical load conditions. However, simultaneous switching of multiple outputs can induce transient currents in the supply rail; therefore, local bypass capacitance (≥100nF ceramic + 10μF tantalum per IC) is essential to stabilize VCC during fast transitions and minimize ground bounce effects.
What is the impact of enabling all four multiplexers in parallel on total power consumption when one select line toggles frequently?
Enabling all four independent 2:1 muxes in the SN74LVC257ADB increases quiescent current by approximately 0.1mA per enabled channel compared to standby. If one select line toggles at 1MHz with 50% duty cycle, dynamic switching contributes roughly 0.5mW per channel at 3.3V, totaling ~2mW across all four. Total power depends heavily on output loading—driving LEDs or buffers increases static dissipation significantly. Designers should simulate worst-case scenarios using TI’s Power Estimator tools for accurate thermal modeling.
Is it acceptable to cascade two SN74LVC257ADB devices to create an 8-input multiplexer without violating setup time constraints?
Cascading two SN74LVC257ADB units to form an 8:1 mux introduces cumulative propagation delays that may violate timing budgets in high-speed systems. Each stage adds ~3.8ns of latency plus routing delays. Assuming ideal conditions, total delay reaches ~7.6ns, which is manageable up to 130MHz. However, inter-stage buffering or clock domain synchronization becomes necessary if downstream logic has tight setup windows. Additionally, fan-out limitations require level-shifting buffers if driving multiple inputs, increasing complexity beyond simple cascading.
What precautions should be observed when using the SN74LVC257ADB with unpowered inputs during system initialization?
The SN74LVC257ADB supports powered-off operation only when all inputs are held at valid logic levels or actively driven. If any input floats during power-up, excessive current may flow through parasitic diodes into the substrate, potentially causing latch-up. To prevent damage, pull-down resistors (10kΩ) on unused inputs and controlled slew rates on enable/select lines are advised. Alternatively, use external clamping diodes to VCC or GND if partial power sequencing is unavoidable.
How does the SN74LVC257ADB compare to the CD74HC257 in terms of speed, power, and voltage compatibility?
The SN74LVC257ADB generally outperforms the CD74HC257 in several areas: it operates from 1.65V to 3.6V versus HC’s 2V to 6V range, making it more suitable for mixed-voltage systems. Propagation delay is lower (≈3.8ns vs ≈12ns), and leakage current is significantly reduced (<±5μA vs ±10μA). However, the HC version offers higher output drive (up to 25mA) and broader temperature support in some variants. For modern low-power designs prioritizing integration density and battery life, the LVC series like the SN74LVC257ADB is preferred despite slightly tighter voltage tolerances.
Are there known issues with the SN74LVC257ADB when switching between high-impedance sources without proper termination?
Yes, connecting high-Z sources directly to the SN74LVC257ADB without termination can result in undefined logic states due to floating inputs. Since CMOS inputs draw negligible DC current but are susceptible to noise coupling, undriven lines may oscillate or settle unpredictably. Always terminate unused inputs to VCC or GND via 10kΩ resistors or actively drive them. In RF-sensitive applications, ferrite beads or RC filters on select/enable lines further reduce susceptibility to radiated interference.
What is the maximum allowable capacitive load per output when using the SN74LVC257ADB to drive long traces or connector pins?
The SN74LVC257ADB can reliably drive up to 50pF per output with minimal degradation in rise/fall times, based on TI characterization data. Beyond this, signal integrity degrades due to increased RC time constants. For loads exceeding 50pF—such as long PCB traces (>10cm) or multiple parallel connectors—buffer stages or line drivers should be inserted. If driving only one input at a time, total distributed capacitance should stay below 30pF for reliable operation above 10MHz edge rates.
Does the SN74LVC257ADB require external protection circuits when used in ESD-prone environments?
Although the SN74LVC257ADB includes basic human-body model (HBM) ESD protection (±2kV), industrial environments often demand higher robustness. Implementing TVS diodes (e.g., SMAJ5.0A) on all signal pins and a dedicated clamp on VCC/GND provides adequate defense against IEC 61000-4-2 surges. Additionally, keep input traces short and avoid stubs near sensitive nodes. Proper grounding practices and enclosure shielding remain critical regardless of IC-level protections.
How does the SN74LVC257ADB behave when its enable pin is left unconnected during operation?
Leaving the OE# (output enable) pin floating on the SN74LVC257ADB risks unpredictable output states because the input may float near threshold voltages where noise can trigger unintended conduction. The datasheet specifies that all inputs must be tied to defined logic levels. Best practice is to connect OE# to VCC (active-low) or GND (inactive) via a pull-up or pull-down resistor (≤10kΩ) to ensure stable enable/disable behavior and prevent shoot-through currents during transitions.
What role does the base product number 74LVC257 play in selecting alternative components to the SN74LVC257ADB?
The base product number 74LVC257 identifies a family of functionally equivalent multiplexers across different packages and manufacturers. When substituting the SN74LVC257ADB, verifying that the replacement shares the same logic function, pinout, voltage range, and timing parameters ensures design continuity. However, always confirm package dimensions, lead counts, and thermal characteristics match layout constraints. Cross-referencing through authorized distributors or TI’s parametric search tool prevents mismatches that could compromise signal integrity or assembly yield.
In a multi-master I²C system, could the SN74LVC257ADB introduce contention issues when routing SDA/SCL lines?
Yes, the SN74LVC257ADB is not bidirectional and cannot isolate I²C lines properly. Connecting SDA or SCL through a unidirectional mux creates a risk of bus contention if both masters attempt arbitration simultaneously, as the open-drain structure relies on external pull-ups and internal feedback. Instead, use specialized I²C switches like PCA9540B designed for such topologies. The SN74LVC257ADB lacks open-drain outputs and bidirectional control, making it unsuitable for I²C routing despite its general-purpose mux capability.
What are the implications of using the SN74LVC257ADB in a system with split power domains?
Operating the SN74LVC257ADB across isolated power rails (e.g., 3.3V MCU side and 1.8V sensor side) requires careful attention to input voltage thresholds. The LVC family accepts 0.8×VCC as valid LOW and up to VCC+0.5V as HIGH, allowing safe translation between 1.8V and 3.3V domains. However, simultaneous assertion of high-voltage inputs during power-up sequencing may exceed absolute maximum ratings. Isolate control signals with level shifters or add series resistors to limit current if cross-domain switching occurs asynchronously.
How does package size affect signal routing when integrating the SN74LVC257ADB into compact PCBs?
The 16-pin SSOP package measures 5.3mm wide and 4.2mm tall, fitting many space-constrained designs. However, its narrow pitch (0.65mm) demands precise PCB fabrication with Class 3 tolerances. Routing adjacent differential pairs or high-speed clocks nearby can couple noise into mux outputs due to proximity. Maintain >3× trace width spacing between sensitive nets and keep return paths uninterrupted beneath the package. Thermal vias under the exposed pad enhance heat spreading but must not interfere with high-impedance traces.
Can the SN74LVC257ADB be used in redundant system architectures requiring fail-safe mode selection?
Yes, the SN74LVC257ADB supports redundancy schemes by isolating primary and backup paths through its four independent 2:1 muxes. In fail-safe mode, the control logic can redirect traffic by asserting the appropriate select line while disabling the faulty branch via OE#. Because the LVC series has low quiescent current and fast switching, transition times are brief, minimizing service interruption. Ensure firmware initializes mux states before enabling outputs to avoid glitches during state changes.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74LVC257ADB

Product Attribute SN74LVC257ADBRE4 SN74LVC257ADBR SN74LVC257ADBRG4 SN74LVC257ADR
Part Number SN74LVC257ADBRE4 SN74LVC257ADBR SN74LVC257ADBRG4 SN74LVC257ADR
Manufacturer Luminary Micro / Texas Instruments Texas Instruments Luminary Micro / Texas Instruments Texas Instruments
Circuit - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Independent Circuits - - - -
Voltage - Supply - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Type - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Output High, Low - - - -
Series - - - -
Voltage Supply Source - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

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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.

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SN74LVC257ADB Image

SN74LVC257ADB

Texas Instruments
98D-SN74LVC257ADB

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