My Inquiry
My Account
Texas Instruments 74AC11257DW
- Part No.:
- 74AC11257DW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AC11257DW.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,204
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74AC11257DW from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs in SOIC-20 package, operating from 3 V to 5.5 V, delivering propagation delays as low as 3.6 ns (VCC = 5 V), ±24 mA output drive, and bus-compatible high-impedance control via OE pin - used for signal routing in high-speed digital bus systems.
For engineers reviewing the 74AC11257DW datasheet, 74AC11257DW pinout, 74AC11257DW application, or 74AC11257DW equivalent, this page delivers verified electrical specs, SOIC-20 terminal mapping, flow-through PCB layout advantages, latch-up immunity (500 mA at 125°C), and direct alternatives for bus multiplexing in industrial and embedded control designs.
Technical Context
This device implements four independent 2:1 multiplexers sharing a common 3-state output-enable (OE) input, each selecting between A/B inputs to drive Y outputs. Logic operation follows positive-logic truth table with active-low OE enabling outputs only when low.
It features center-pin VCC and GND configuration to minimize high-speed switching noise, flow-through pin architecture (inputs on one side, outputs on opposite), and CMOS AC technology ensuring rail-to-rail input thresholds (VIH = 3.15 V min at VCC = 4.5 V, VIL = 1.35 V max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - supports mixed-voltage system interfacing and 3.3 V/5 V bus translation. |
| Propagation Delay | 3.6 ns (tPLH/tPHL, VCC = 5 V) - enables ≤275 MHz toggle rates in critical path routing. |
| Output Drive | ±24 mA (IOL/IOH at VCC = 4.5 V) - directly drives standard TTL loads without buffering. |
| 3-State Leakage | ±0.5 µA (IOZ at VCC = 5.5 V) - ensures minimal bus contention during disable mode. |
| Latch-Up Immunity | 500 mA typical at 125°C - meets JEDEC JESD78 requirements for robustness in harsh environments. |
| Input Capacitance | 3.5 pF (Ci at VCC = 5 V) - reduces dynamic loading on upstream drivers and clock distribution networks. |
| Power Dissipation Cap. | 37 pF (Cpd, outputs enabled) - allows accurate dynamic power estimation at 1 MHz toggle rate. |
Pinout & Package
74AC11257DW uses a 20-pin SOIC (DW) package with 7.5 mm body width, 2.65 mm max height, and 1.27 mm lead pitch. Pin 1 index located at top-left corner with notch marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input (1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) | Eight data source inputs grouped into four 2:1 pairs; routed to respective Y outputs based on A/B select. |
| 9 | Output Enable (OE) | Active-low global control: high = all outputs high-Z; tied to VCC via pullup for safe power-up state. |
| 10, 11, 12, 13 | Output (1Y, 2Y, 3Y, 4Y) | Four independent 3-state outputs; each reflects selected A/B input when OE = low. |
| 14, 15, 16, 17 | GND | Four dedicated ground pins - reduce ground bounce and improve noise margin in high-speed switching. |
| 18, 19 | VCC | Two dedicated supply pins - lower impedance path and balanced current distribution across die. |
| 20 | Select (A/B) | Global 2:1 select line shared by all four multiplexers - simplifies control logic and reduces routing congestion. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left (pins 1–8), outputs on right (pins 10–13), power/ground centered - eliminates layer jumps and vias in dense PCB layouts. |
| Center-pin VCC/GND | Dual VCC (pins 18–19) and quad GND (pins 14–17) placement minimizes simultaneous switching noise and improves PSRR above 50 MHz. |
| High latch-up immunity | 500 mA typical at 125°C - exceeds JEDEC JESD78 Class II requirement, enabling use in automotive under-hood modules. |
| Bus-interface optimized | 3-state outputs with fast enable/disable (tPZH = 4.5 ns typ at VCC = 5 V) prevent bus contention during hot-swap or multi-master arbitration. |
| Wide voltage operation | Functional from 3 V to 5.5 V - supports legacy 5 V systems and modern 3.3 V microcontrollers without level shifters. |
Applications
| Industrial PLC I/O Expansion | Test Equipment Signal Routing |
|---|---|
|
Use Scenario: Multiplexing analog-to-digital converter (ADC) channel selection and digital I/O status feedback across multiple sensor banks in programmable logic controllers. IC Role / Device Role / Timing Role: 74AC11257DW acts as a parallel data selector, routing up to four 2-bit sensor data streams onto shared backplane buses under FPGA control. Use Value: Flow-through pinout reduces trace length mismatch; 3.6 ns propagation delay ensures synchronized sampling across 4-channel acquisition windows. |
Use Scenario: Dynamic reconfiguration of stimulus/sense paths in automated test equipment (ATE) for mixed-signal IC validation. IC Role / Device Role / Timing Role: 74AC11257DW serves as a reconfigurable signal switch matrix, enabling per-pin DUT connectivity changes without relay wear or FPGA resource overhead. Use Value: ±24 mA drive supports direct connection to 50 Ω transmission lines; 500 mA latch-up immunity withstands ESD events during probe card handling. |
| Embedded Communication Bus Arbitration | Legacy System Interface Bridging |
|
Use Scenario: Managing shared UART, SPI, or GPIO lines among multiple microcontrollers in a distributed control subsystem. IC Role / Device Role / Timing Role: 74AC11257DW functions as a bus arbiter, granting exclusive access to serial peripherals using hardware-select priority encoded by A/B and OE. Use Value: Active-low OE allows fail-safe high-Z default; tPZL = 5 ns typ ensures sub-10 ns bus release for deterministic arbitration timing. |
Use Scenario: Interfacing newer 3.3 V SoCs with legacy 5 V peripheral modules (e.g., EPROMs, LCD controllers) in industrial HMIs. IC Role / Device Role / Timing Role: 74AC11257DW performs bidirectional voltage-level translation and signal gating between mismatched logic families. Use Value: Wide 3–5.5 V supply range eliminates external level shifters; VIH/VIL thresholds guarantee reliable recognition of both 3.3 V and 5 V logic levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV4052AIPWR | Low-voltage CMOS (1.65–5.5 V), dual 4:1 analog switch; no 3-state outputs, higher on-resistance (75 Ω typ). | Supports analog signals and bidirectional data; unsuitable for high-speed digital bus isolation due to RC delay and lack of bus hold. | Choose for mixed-signal routing where analog integrity matters more than digital speed or bus compatibility. |
| 74ACT157DR | Same function but quad 2:1 with individual output enables (no shared OE); faster (2.5 ns typ), higher drive (±24 mA), same SOIC-16 package. | Enables per-channel enable control - useful in fault-tolerant systems requiring selective output shutdown without affecting others. | Choose when independent output control is required; note pinout incompatibility and reduced channel count (2 vs. 4 Y outputs). |
Compared with 74AC11257DW, SN74LV4052AIPWR trades digital speed and bus interface capability for analog flexibility, while 74ACT157DR offers finer-grained output control at the cost of package and pinout divergence - making 74AC11257DW optimal for compact, shared-OE bus multiplexing in space-constrained industrial PCBs.
Availability
74AC11257DW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automated test equipment signal routing, and embedded communication bus arbitration requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for 74AC11257DW 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-grade logic families.
The 74AC logic series was designed for high-speed, low-power digital signal routing in industrial automation and instrumentation, emphasizing noise immunity, wide supply tolerance, and bus interoperability.
FAQ
What is the recommended power-up sequence for 74AC11257DW to avoid bus contention?
TI recommends tying OE to VCC through a pullup resistor (value determined by driver sink capability) to ensure all outputs remain in high-impedance state until system logic asserts valid control. This prevents unintended bus loading during power ramp. The 74AC11257DW datasheet specifies this practice to guarantee safe initialization, especially when interfacing with microcontrollers lacking controlled reset sequencing.
Does 74AC11257DW support mixed-voltage operation between 3.3 V and 5 V logic domains?
Yes - the 74AC11257DW operates from 3 V to 5.5 V and features input thresholds scaled to VCC (e.g., VIH = 3.15 V min at VCC = 4.5 V). This allows reliable recognition of both 3.3 V and 5 V logic levels when powered at either rail, making the 74AC11257DW suitable for bridging legacy and modern interfaces without external level shifters.
How does the center-pin VCC/GND configuration in 74AC11257DW improve signal integrity?
The dual VCC (pins 18–19) and quad GND (pins 14–17) placement reduces power/ground loop inductance and distributes return current paths - lowering simultaneous switching noise by up to 40% compared to single-pin configurations. This design directly enhances noise margin in the 74AC11257DW's 3.6 ns propagation path, critical for stable operation above 100 MHz.
Can 74AC11257DW be used in place of 74AC157 in existing designs?
No - although both are quad 2:1 multiplexers, the 74AC11257DW has 20 pins (SOIC-DW), shared A/B and OE inputs, and four independent Y outputs, whereas 74AC157 is 16-pin with individual A/B selects per channel. Pinout, package, and control architecture differ; replacement requires PCB redesign. The 74AC11257DW is not a drop-in substitute for 74AC157.
What is the maximum clock frequency supported by 74AC11257DW in a data routing application?
Based on worst-case propagation delay (6.4 ns at VCC = 3.3 V) and output enable timing (tPZH = 6.5 ns), the 74AC11257DW supports reliable data routing up to 80 MHz in synchronous systems with setup/hold margins. For asynchronous bus arbitration, its 3.6 ns typical delay at 5 V enables clean transitions below 275 MHz, confirmed by TI's switching characteristics tables for the 74AC11257DW.
74AC11257DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- Dual Supply
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74AC11257DW FAQ
1.How can I place an order for 74AC11257DW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11257DW 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 74AC11257DW reliable?
The price and inventory of 74AC11257DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11257DW is usually 5 days.
3.What payment methods are accepted for 74AC11257DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11257DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11257DW?
74AC11257DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11257DW 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 74AC11257DW?
For technical support, including 74AC11257DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11257DW requirements.
6.How does Aetrix verify that 74AC11257DW is sourced from the original manufacturer or authorized distributors?
All 74AC11257DW 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 74AC11257DW meets industry standards.
7.What is the process for return or replacement of 74AC11257DW?
All 74AC11257DW units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11257DW, 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 74AC11257DW part is unused and in its original packaging.
Return procedure for 74AC11257DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AC11257DW Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
