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Texas Instruments SN74LVC257APWRE4
- Part No.:
- SN74LVC257APWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC257APWRE4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,567
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Product details
Overview
SN74LVC257APWRE4 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 4-bit data paths-commonly used in I/O expanders and telecom infrastructure backplanes.
For engineers reviewing the SN74LVC257APWRE4 datasheet, SN74LVC257APWRE4 pinout, SN74LVC257APWRE4 application, or SN74LVC257APWRE4 equivalent, key selection criteria include 3-state output control timing (ten/tdis ≤ 5.6ns), overvoltage-tolerant inputs, rail-to-rail output swing capability, and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
This device implements four independent 2:1 multiplexers sharing a common active-low output-enable (OE) input and a single select line (A/B). Each channel routes either input A or B to its corresponding Y output based on A/B logic level, while OE controls simultaneous 3-state output disable across all four channels.
Its CMOS design ensures balanced drive strength (±24mA at 3V), low dynamic power (Cpd = 15.5pF at 3.3V), and robust ESD protection (±2000V HBM). Input voltage tolerance to 5.5V enables direct interfacing between 3.3V logic and legacy 5V systems without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - supports modern low-voltage digital systems and mixed-supply designs |
| Input Voltage Max | 5.5V - allows direct connection to 5V sources without level-shifting circuitry |
| tpd Max | 4.6ns at VCC = 3.3V - enables use in high-speed data routing up to ~200MHz clock domains |
| IOL/IOH | ±24mA at VCC = 3V - drives standard TTL loads and multiple CMOS inputs simultaneously |
| 3-State Leakage | ±10μA at VCC = 3.6V - minimizes bus leakage current when outputs are disabled |
| ESD Rating | ±2000V HBM - meets industrial handling requirements without additional protection |
| Operating Temp | –40°C to +85°C - qualified for commercial and industrial ambient environments |
Pinout & Package
TSSOP-16 (PW) package: 5.00mm × 6.4mm body size, 0.65mm lead pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | A/B, OE, VCC | Select line (low = A, high = B); active-low output enable; main power supply |
| 2–4, 5–7, 10–12, 13–14 | 1A/1B/1Y, 2A/2B/2Y, 3A/3B/3Y, 4A/4B/4Y | Four independent 2:1 mux channels - each with dual inputs and one 3-state output |
| 8 | GND | Reference ground for all signals and power return path |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts 0–5.5V regardless of VCC, enabling seamless 3.3V/5V system bridging |
| Ultra-fast propagation delay | 4.6ns max at 3.3V supports high-throughput data switching in real-time interfaces |
| Low ground bounce / undershoot | VOLP < 0.8V and VOHV > 2V at 3.3V reduce signal integrity risks in dense routing |
| High-drive 3-state outputs | ±24mA drive capability maintains signal integrity under capacitive bus loading |
| Latch-up immunity | Exceeds 250mA per JESD17 - prevents destructive latch-up during transient faults |
Applications
| Cable Modem Termination Systems | Network Switches |
|---|---|
Use Scenario: Routing configuration data and status signals between upstream/downstream PHY layers and management MCU. IC Role / Device Role / Timing Role: Data selector isolating control buses during firmware updates or link renegotiation. Use Value: Prevents bus contention during hot-swap events using fast 3-state enable/disable (ten/tdis ≤ 5.6ns). | Use Scenario: Multiplexing diagnostic signals from multiple port controllers onto shared monitoring bus. IC Role / Device Role / Timing Role: 4-channel signal router enabling per-port debug visibility without dedicated traces. Use Value: Reduces PCB layer count by consolidating four independent 2:1 paths into single TSSOP-16 footprint. |
| I/O Expanders | Telecom Infrastructure |
Use Scenario: Adding GPIO flexibility to microcontrollers with limited native I/O pins via SPI/I²C-to-parallel bridge. IC Role / Device Role / Timing Role: Signal multiplexer selecting between primary and backup peripheral data lanes. Use Value: Enables failover path selection with sub-5ns latency and no external level translation required. | Use Scenario: Interfacing legacy 5V sensor modules with modern 3.3V baseband processors in remote radio units. IC Role / Device Role / Timing Role: Voltage-translating multiplexer preserving signal integrity across supply domain boundaries. Use Value: Eliminates discrete level shifter components while maintaining 4.6ns timing budget for real-time control loops. |
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 but lacks overvoltage-tolerant inputs (max VI = VCC + 0.5V) | Not suitable for 5V-to-3.3V translation; requires external clamping or level shifters | Choose only if operating exclusively within 1.65–3.6V domain and cost is critical |
| 74AVC4T245RHLR | Bidirectional level translator with auto-direction sensing; not a pure multiplexer | Supports bidirectional data flow but cannot perform 2:1 selection logic without external control | Select when bus directionality varies dynamically and voltage translation is primary need |
Compared with SN74LVC157APWR and 74AVC4T245RHLR, the SN74LVC257APWRE4 uniquely combines true 2:1 multiplexing, 5.5V-tolerant inputs, and 3-state outputs in a single TSSOP-16 package-making it optimal for deterministic signal routing in mixed-voltage embedded systems where pin count and timing predictability are constrained.
Availability
SN74LVC257APWRE4 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 SN74LVC257APWRE4 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 experience delivering high-reliability logic and interface solutions.
The SN74LVC257A product line targets space-constrained, mixed-voltage digital systems requiring deterministic signal routing, low-power 3-state bus isolation, and robust interoperability across legacy and modern logic families.
FAQ
What is the maximum input voltage rating for SN74LVC257APWRE4?
The SN74LVC257APWRE4 supports input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic sources even when powered from 1.65V–3.6V supplies. This overvoltage tolerance eliminates the need for external level-shifting components in mixed-voltage systems and is verified per TI's recommended operating conditions table.
Does SN74LVC257APWRE4 support true 3-state output disable?
Yes, SN74LVC257APWRE4 features an active-low output-enable (OE) input that places all four Y outputs in high-impedance state when asserted high. The specified ten and tdis times are ≤5.6ns at 3.3V, ensuring rapid bus release and preventing contention in time-critical multiplexed architectures.
What package type is used for SN74LVC257APWRE4?
SN74LVC257APWRE4 uses the TSSOP-16 (PW) package: 5.00mm × 6.4mm body size, 0.65mm lead pitch, surface-mount, RoHS-compliant, and rated for moisture sensitivity level 1 (MSL-1, unlimited floor life at ≤30°C/60% RH).
Can SN74LVC257APWRE4 operate at 1.8V supply?
Yes, SN74LVC257APWRE4 is fully specified down to 1.65V VCC. At 1.8V, it maintains guaranteed switching performance (tpd ≤13.5ns), input thresholds (VIH ≥ 0.65×VCC, VIL ≤ 0.35×VCC), and output drive (±4mA), making it suitable for ultra-low-power portable and battery-operated applications.
How does SN74LVC257APWRE4 differ from SN74LVC157APWR?
SN74LVC257APWRE4 differs from SN74LVC157APWR primarily in input voltage tolerance: SN74LVC257APWRE4 accepts inputs up to 5.5V irrespective of VCC, whereas SN74LVC157APWR limits inputs to VCC + 0.5V. Both share identical 4-channel 2:1 multiplexer functionality and TSSOP-16 packaging, but only SN74LVC257APWRE4 enables safe 5V-to-3.3V translation without external components.
SN74LVC257APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVC257APWRE4 FAQ
1.How can I place an order for SN74LVC257APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC257APWRE4 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 SN74LVC257APWRE4 reliable?
The price and inventory of SN74LVC257APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC257APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC257APWRE4 transactions.
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4.How is shipping managed for SN74LVC257APWRE4?
SN74LVC257APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC257APWRE4 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 SN74LVC257APWRE4?
For technical support, including SN74LVC257APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257APWRE4 requirements.
6.How does Aetrix verify that SN74LVC257APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC257APWRE4 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 SN74LVC257APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC257APWRE4?
All SN74LVC257APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257APWRE4, 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 SN74LVC257APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC257APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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