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Texas Instruments SN74LVC257APW
- Part No.:
- SN74LVC257APW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC257APW.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,166
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Product details
Overview
SN74LVC257APW from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs, designed for 1.65V–3.6V operation. It features 4 independent 2:1 multiplexers, 16-pin TSSOP package, 4.6ns max propagation delay at 3.3V, and 5.5V-tolerant inputs-enabling level translation in mixed-voltage bus systems such as I/O expanders and network switch control planes.
For engineers reviewing the SN74LVC257APW datasheet, SN74LVC257APW pinout, SN74LVC257APW application, or SN74LVC257APW equivalent, key selection criteria include its 3-state output enable (OE) logic, VCC-referenced input thresholds, thermal resistance (RθJA = 141.8°C/W), and compatibility with 1.65V–3.6V supply domains in space-constrained industrial and telecom PCB layouts.
Technical Context
The SN74LVC257APW implements four independent 2:1 multiplexers sharing a common active-low output-enable (OE) signal and a single select line (A/B) that determines whether each Y output passes A or B input. Its CMOS design ensures balanced drive strength and rail-to-rail output swing within VCC limits.
All inputs tolerate up to 5.5V regardless of VCC (1.65V–3.6V), enabling robust interfacing between legacy 5V logic and modern low-voltage microcontrollers. The 3-state outputs isolate downstream buses when OE is high, preventing contention during power sequencing or dynamic reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - supports dual-supply systems and battery-backed logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - allows direct connection to 5V sources without external clamping or translation circuitry. |
| Max Propagation Delay | 4.6ns at VCC = 3.3V - enables use in high-speed digital control paths up to ~200MHz toggle rate. |
| Output Drive Strength | ±24mA at VCC = 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads on shared buses. |
| ESD Rating | ±2000V HBM - meets industrial IEC 61000-4-2 system-level immunity requirements for board-level robustness. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and networking equipment deployment. |
| Thermal Resistance | RθJA = 141.8°C/W (TSSOP-16) - requires minimal copper area for thermal management in compact designs. |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 6.4 mm body size, 0.65 mm pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B | Select line: Low → route A inputs to Y outputs; High → route B inputs to Y outputs. |
| 2–3, 5–6, 10–11, 13–14 | 1A/1B, 2A/2B, 3A/3B, 4A/4B | Four pairs of multiplexer data inputs - each pair feeds one 2:1 channel. |
| 4, 7, 9, 12 | 1Y, 2Y, 3Y, 4Y | Four 3-state multiplexer outputs - high-impedance when OE = high. |
| 8 | GND | Ground reference for all logic and output stages - must be low-inductance connection. |
| 16 | VCC | Primary power supply - bypass with 0.1μF capacitor placed adjacent to pin per TI layout guidelines. |
| 15 | OE | Active-low output enable - tied high via pullup resistor during power-up to prevent bus contention. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5V-tolerant inputs | Enables direct interface with 5V peripherals in 3.3V or 1.8V systems without external translators. |
| 3-state outputs with common OE | Allows time-multiplexed sharing of 4-bit data buses across multiple functional blocks in embedded controllers. |
| Low propagation delay (4.6ns) | Supports synchronous timing margins in high-speed address/data routing applications up to 200MHz. |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., VIH ≥ 2.0V at VCC = 3.3V), ensuring reliable switching in noisy environments. |
| Latch-up immunity >250mA | Guarantees robust operation under transient overvoltage or ESD-induced current injection events. |
Applications
| Industrial I/O Expansion | Telecom Line Card Control |
|---|---|
Use Scenario: Adding GPIO flexibility to PLC modules using limited MCU pins. IC Role / Device Role / Timing Role: Multiplexing 4 sets of sensor/actuator signals onto a shared 4-bit parallel bus under firmware control. Use Value: Reduces required MCU port count by 50% while maintaining deterministic 4.6ns signal routing latency. |
Use Scenario: Selecting between redundant clock sources or diagnostic test patterns in carrier-grade switches. IC Role / Device Role / Timing Role: 2:1 data selector for failover path switching with sub-5ns propagation delay and glitch-free 3-state isolation. Use Value: Enables hot-swappable module control without bus contention or timing violations during switchover. |
| Test Equipment Signal Routing | Motor Driver Interface Logic |
Use Scenario: Configuring stimulus/response paths in automated test fixtures for multi-channel DUTs. IC Role / Device Role / Timing Role: Quad 2:1 mux routing analog/digital test signals from source to DUT or measurement instrument. Use Value: Provides voltage-level agnostic signal path selection (5V inputs into 3.3V logic domain) with <10ns total skew. |
Use Scenario: Interfacing microcontroller PWM outputs to multiple half-bridge gate drivers in BLDC inverters. IC Role / Device Role / Timing Role: Selecting between primary and backup PWM channels per motor phase under fault conditions. Use Value: Delivers deterministic 3-state disable timing (<5ns tdis) to prevent shoot-through during driver reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC157APW | Same pinout, identical function, but lacks 5.5V input tolerance - max VI = VCC + 0.5V. | Not suitable for mixed 5V/3.3V signal routing; requires external clamping if interfacing with 5V sources. | Choose SN74LVC157APW only in fully 3.3V-only systems where cost reduction outweighs voltage flexibility. |
| 74LVC257PW,118 (Nexperia) | Functionally identical, same TSSOP-16 package, but RθJA = 135°C/W and VOH/VOL specs differ slightly at 1.8V. | Valid for industrial temperature range, but requires validation of output drive at lowest VCC (1.65V) in critical designs. | Use 74LVC257PW,118 when second-source qualification is required and thermal margin permits higher junction rise. |
Compared with SN74LVC157APW and 74LVC257PW,118, the SN74LVC257APW uniquely combines 5.5V input tolerance, guaranteed 4.6ns tpd at 3.3V, and TI's production-tested latch-up immunity - making it the preferred choice for mixed-voltage, high-reliability bus multiplexing.
Availability
SN74LVC257APW is available at Aetrix Electronics and suitable for industrial I/O expansion, telecom line card control, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC257APW 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 50 years of innovation in logic and interface ICs.
The SN74LVC257APW belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage interoperability in industrial automation, communications infrastructure, and test instrumentation.
FAQ
What is the maximum input voltage rating for SN74LVC257APW?
The SN74LVC257APW supports input voltages up to 5.5V regardless of VCC level (1.65V–3.6V), enabling direct interfacing with 5V logic families without level-shifting circuitry. This overvoltage tolerance is confirmed in Section 5.3 of the datasheet under "VI Input voltage" and applies to all input pins including A/B, 1A–4B, and OE. Exceeding 5.5V risks permanent damage per absolute maximum ratings.
Does SN74LVC257APW support 1.8V operation?
Yes, SN74LVC257APW is fully specified down to 1.65V VCC, including guaranteed switching characteristics at 1.8V (tpd ≤13.5ns). Electrical parameters such as VIH (≥0.65×VCC), VOL (≤0.45V), and IOH/IOL are validated across the full 1.65V–3.6V range, making SN74LVC257APW suitable for battery-powered and ultra-low-power embedded systems.
How should the OE pin be handled during power-up?
The OE pin of SN74LVC257APW must be held high (disabled state) during power-up to prevent bus contention. TI recommends tying OE to VCC through a pullup resistor; minimum value depends on driver sink capability but typically 10kΩ suffices. This ensures all Y outputs remain in high-impedance until firmware asserts OE low, avoiding undefined states on shared data lines.
What is the thermal performance of SN74LVC257APW in TSSOP-16?
SN74LVC257APW in PW (TSSOP-16) package has a junction-to-ambient thermal resistance (RθJA) of 141.8°C/W, measured per JEDEC JESD51 standards. At 24mA output load and 3.3V VCC, typical power dissipation is <15mW per channel - resulting in <10°C junction rise above ambient under worst-case static loading, assuming standard 1oz copper PCB layout.
Is SN74LVC257APW pin-compatible with SN74LVC157APW?
Yes, SN74LVC257APW and SN74LVC157APW share identical TSSOP-16 pinout, function table, and AC/DC specifications - but SN74LVC157APW lacks 5.5V input tolerance (max VI = VCC + 0.5V). Substitution is electrically safe only if all inputs remain within VCC + 0.5V; otherwise, SN74LVC257APW provides essential overvoltage protection in mixed-voltage systems.
SN74LVC257APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74LVC257APW FAQ
1.How can I place an order for SN74LVC257APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC257APW 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 SN74LVC257APW reliable?
The price and inventory of SN74LVC257APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC257APW is usually 5 days.
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SN74LVC257APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC257APW 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 SN74LVC257APW?
For technical support, including SN74LVC257APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC257APW requirements.
6.How does Aetrix verify that SN74LVC257APW is sourced from the original manufacturer or authorized distributors?
All SN74LVC257APW 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 SN74LVC257APW meets industry standards.
7.What is the process for return or replacement of SN74LVC257APW?
All SN74LVC257APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC257APW, 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 SN74LVC257APW part is unused and in its original packaging.
Return procedure for SN74LVC257APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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