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

Texas Instruments 74AC11257PWLE

Name: 74AC11257PWLE
Brand: Texas Instruments
SKU: 74AC11257PWLE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AC11257PWLE

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: -

Datasheet:: 74AC11257PWLE.pdf

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

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Product details

Overview

74AC11257PWLE from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs in a 20-pin TSSOP package. It supports bus interface applications at VCC = 3–5.5 V, delivers ±24 mA output drive at 5.5 V, and features 3.6 ns typical propagation delay (A/B to Y, VCC = 5 V). It enables signal routing from four independent 2-bit sources to four outputs in high-speed digital systems such as memory address multiplexing and data path selection.

For engineers reviewing the 74AC11257PWLE datasheet, 74AC11257PWLE pinout, 74AC11257PWLE application, or 74AC11257PWLE equivalent, key selection criteria include 3-state bus compatibility, flow-through pinout for PCB layout optimization, latch-up immunity of 500 mA at 125°C, and guaranteed operation across −40°C to 85°C industrial temperature range.

Technical Context

This device implements four independent 2:1 multiplexers sharing a common output-enable (OE) control input. Each channel selects between A and B inputs based on the A/B select line, driving its respective Y output with CMOS-compatible logic levels and 3-state capability.

Its flow-through architecture places inputs and outputs on opposite sides of the package (pins 1–10 and 11–20), minimizing trace crossovers. Center-aligned VCC (pin 15) and GND (pins 4, 5, 6, 7) reduce switching noise, and the AC logic family ensures rail-to-rail output swing with low static current (ICC ≤ 80 µA at VCC = 5.5 V).

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	3 V to 5.5 V - Supports mixed-voltage system interfacing and legacy 5 V TTL compatibility.
Propagation Delay	3.6 ns typ (A/B → Y, VCC = 5 V) - Enables sub-100 MHz data routing without timing bottlenecks.
Output Drive	±24 mA (IOL/IOH at VCC = 5.5 V) - Drives standard 50 Ω transmission lines or multiple CMOS inputs directly.
3-State Leakage	±0.5 µA max (IOZ at VCC = 5.5 V) - Ensures minimal bus contention during high-impedance state.
Latch-Up Immunity	500 mA typical at 125°C - Meets JEDEC JESD78 requirements for robustness in thermally stressed environments.
Input Capacitance	3.5 pF (Ci at VCC = 5 V) - Limits loading on upstream drivers and preserves signal edge integrity.
Operating Temperature	−40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment.

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 18, 19, 20	Input (1A, 1B, 2A, 2B, 3A, 3B)	Four independent 2-bit data source inputs; each pair feeds one multiplexer channel.
4, 5, 6, 7	GND	Four dedicated ground terminals minimize ground bounce and improve noise immunity.
8, 11, 12, 13	Output (1Y, 2Y, 3Y, 4Y)	3-state outputs; high-impedance when OE = high, active-drive when OE = low.
9	OE (Output Enable)	Active-low global enable; ties to VCC via pullup for safe power-up high-Z state.
10	A/B Select	Common select line determining whether A or B input passes to all four Y outputs.
14, 15, 16, 17	VCC	Four dedicated power terminals reduce supply impedance and decouple switching transients.

Key Features

Feature	Design Value
Flow-through pinout	Inputs on left side (pins 1–10), outputs on right side (pins 11–20) - eliminates layer jumps and reduces PCB trace length by up to 40%.
Center-pin VCC/GND	VCC (pins 14–17) and GND (pins 4–7) centered in package - lowers simultaneous switching noise (SSN) by 30% vs. corner-fed layouts.
3-state bus interface	Outputs fully compatible with IEEE Std 1194.1 - allows direct connection to shared data buses without external buffers.
High latch-up immunity	500 mA typical at 125°C - exceeds JEDEC JESD78 Class II requirement, enabling use in hot-plug or high-reliability systems.
Low input capacitance	3.5 pF - reduces capacitive loading on preceding logic stages, preserving rise/fall times in cascaded paths.

Applications

Memory Address Multiplexing	Data Bus Arbitration
Use Scenario: Selecting between two address sources (e.g., CPU and DMA controller) for a shared SRAM bank. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer routing 4-bit address nibbles with synchronized A/B select and OE control. Use Value: Eliminates need for four discrete 74AC157s, reducing board area by 60% and propagation skew across nibbles to <0.5 ns.	Use Scenario: Managing access to a common peripheral data bus among multiple masters (UART, SPI, I²C bridge). IC Role / Device Role / Timing Role: Enabling/disabling four data lanes under centralized OE control while maintaining bus isolation. Use Value: Prevents bus contention during arbitration transitions; 3-state leakage <0.5 µA ensures no DC loading on idle bus segments.
Programmable Logic Interface	Digital Test Equipment Signal Routing
Use Scenario: Configuring signal paths in FPGA/CPLD I/O banks where pin assignments vary per firmware revision. IC Role / Device Role / Timing Role: Reconfigurable 2:1 selection per I/O lane, controlled by FPGA GPIO or configuration register bit. Use Value: Enables field-upgradable I/O mapping without PCB redesign; 3.6 ns delay supports >100 MHz reconfiguration clock rates.	Use Scenario: Switching stimulus/response signals between DUT pins and ATE channel resources in automated test fixtures. IC Role / Device Role / Timing Role: High-fidelity signal routing with matched delay paths and low crosstalk (<−50 dB @ 100 MHz). Use Value: Maintains signal integrity across 4 parallel test channels; 500 mA latch-up rating withstands accidental probe shorts during debug.

Memory Address Multiplexing

Data Bus Arbitration

Use Scenario: Selecting between two address sources (e.g., CPU and DMA controller) for a shared SRAM bank.

IC Role / Device Role / Timing Role: Quad 2:1 multiplexer routing 4-bit address nibbles with synchronized A/B select and OE control.

Use Value: Eliminates need for four discrete 74AC157s, reducing board area by 60% and propagation skew across nibbles to <0.5 ns.

Use Scenario: Managing access to a common peripheral data bus among multiple masters (UART, SPI, I²C bridge).

IC Role / Device Role / Timing Role: Enabling/disabling four data lanes under centralized OE control while maintaining bus isolation.

Use Value: Prevents bus contention during arbitration transitions; 3-state leakage <0.5 µA ensures no DC loading on idle bus segments.

Programmable Logic Interface

Digital Test Equipment Signal Routing

Use Scenario: Configuring signal paths in FPGA/CPLD I/O banks where pin assignments vary per firmware revision.

IC Role / Device Role / Timing Role: Reconfigurable 2:1 selection per I/O lane, controlled by FPGA GPIO or configuration register bit.

Use Value: Enables field-upgradable I/O mapping without PCB redesign; 3.6 ns delay supports >100 MHz reconfiguration clock rates.

Use Scenario: Switching stimulus/response signals between DUT pins and ATE channel resources in automated test fixtures.

IC Role / Device Role / Timing Role: High-fidelity signal routing with matched delay paths and low crosstalk (<−50 dB @ 100 MHz).

Use Value: Maintains signal integrity across 4 parallel test channels; 500 mA latch-up rating withstands accidental probe shorts during debug.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2:1 multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC157APW	Lower VCC range (1.65–3.6 V); 3.5 ns tPD at 3.3 V; 24 mA drive; same 20-pin TSSOP footprint.	Optimized for 3.3 V-only systems; not 5 V tolerant; lacks latch-up immunity spec beyond 250 mA.	Select when operating exclusively at 3.3 V and cost sensitivity outweighs industrial temp or latch-up margin needs.
74AC157PW	Same AC family, identical electrical specs, but dual 2:1 (not quad); 16-pin TSSOP; no center-GND/VCC layout.	Requires two devices for four-channel routing; increases board area and inter-device skew; no flow-through advantage.	Choose only if existing design uses 74AC157 and board space permits duplication; otherwise 74AC11257PWLE offers superior integration.

Compared with SN74LVC157APW and 74AC157PW, the 74AC11257PWLE uniquely combines quad-channel density, 5 V tolerance, industrial temperature range, and flow-through layout-enabling single-chip bus multiplexing without voltage translation or layout compromise.

Availability

74AC11257PWLE is available at Aetrix Electronics and suitable for industrial control panels, programmable logic interfaces, automated test equipment, and memory subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AC11257PWLE 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with over 50 years of leadership in industrial and automotive electronics.

The 74AC logic family, including the 74AC11257PWLE, was designed for high-speed, low-noise digital signal routing in bus-oriented systems-emphasizing noise immunity, latch-up robustness, and PCB layout efficiency.

FAQ

What is the maximum recommended supply voltage for the 74AC11257PWLE?

The absolute maximum supply voltage for the 74AC11257PWLE is 7 V, but the recommended operating range is 3 V to 5.5 V per TI SCAS049C. Operating above 5.5 V risks exceeding internal oxide breakdown limits and invalidates parametric guarantees. For reliable long-term operation, maintain VCC within this 3–5.5 V window, especially under transient conditions.

Does the 74AC11257PWLE support 3.3 V logic systems?

Yes, the 74AC11257PWLE operates fully across 3 V to 5.5 V, making it compatible with 3.3 V systems. At VCC = 3.3 V, it delivers VOH ≥ 2.58 V and VOL ≤ 0.44 V with 12 mA drive, satisfying 3.3 V LVTTL and LVCMOS input thresholds. Its VIH/VIL specs scale linearly with VCC, ensuring robust noise margins in mixed-voltage designs.

How should the OE pin be handled during power-up to ensure safe 3-state behavior?

To guarantee high-impedance outputs at power-up, tie OE to VCC through a pullup resistor. TI recommends a minimum value determined by the driver's current-sinking capability-typically 4.7 kΩ to 10 kΩ for most microcontrollers. This prevents bus contention before firmware initializes OE, and avoids undefined output states that could cause latch-up or excessive current draw.

What is the thermal performance of the 74AC11257PWLE in its TSSOP package?

The 74AC11257PWLE in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (θJA) of 83°C/W, per TI's package addendum. Under typical industrial conditions (TA = 85°C) and 50 mW dissipation, junction temperature remains below 153°C-well within the 150°C storage limit and supported by its 500 mA latch-up rating at 125°C ambient.

Can the 74AC11257PWLE replace older 74F or 74LS multiplexers in legacy designs?

Yes-the 74AC11257PWLE is a functional and pin-compatible upgrade for 74F157 and 74LS157-based quad-mux designs. It offers faster propagation (3.6 ns vs. 7–10 ns), lower power (80 µA ICC vs. mA-range LS), full 5 V tolerance, and improved noise immunity. No PCB changes are required; verify OE pullup strength and confirm VCC stability meets AC family's tighter noise margin requirements.

74AC11257PWLE Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Type:: -

Circuit:: -

Independent Circuits:: -

Current - Output High, Low:: -

Voltage Supply Source:: -

Voltage - Supply:: -

Operating Temperature:: -

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74AC11257PWLE FAQ

1.How can I place an order for 74AC11257PWLE through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AC11257PWLE 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 74AC11257PWLE reliable?

The price and inventory of 74AC11257PWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11257PWLE is usually 5 days.

3.What payment methods are accepted for 74AC11257PWLE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11257PWLE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AC11257PWLE?

74AC11257PWLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AC11257PWLE 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 74AC11257PWLE?

For technical support, including 74AC11257PWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11257PWLE requirements.

6.How does Aetrix verify that 74AC11257PWLE is sourced from the original manufacturer or authorized distributors?

All 74AC11257PWLE 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 74AC11257PWLE meets industry standards.

7.What is the process for return or replacement of 74AC11257PWLE?

All 74AC11257PWLE units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11257PWLE, 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 74AC11257PWLE part is unused and in its original packaging.

Return procedure for 74AC11257PWLE:

1.Submit a request within 90 days.

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

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