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Texas Instruments 74ACT11257DW
- Part No.:
- 74ACT11257DW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACT11257DW.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,802
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Product details
Overview
74ACT11257DW from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems. It features TTL-voltage-compatible inputs, 5.5 V max supply voltage, −40°C to 85°C operating temperature, 4.4 ns typical tPLH propagation delay at 5 V, and 24 mA output drive capability. It enables signal routing from four dual-source data buses to four independent outputs in high-speed digital backplanes.
For engineers reviewing the 74ACT11257DW datasheet, 74ACT11257DW pinout, 74ACT11257DW application, or 74ACT11257DW equivalent, this page delivers verified package mapping (SOIC-20 DW), functional truth table alignment, bus-interface timing behavior, and validated alternatives for legacy logic migration and industrial control board redesigns.
Technical Context
The 74ACT11257DW implements four independent 2:1 multiplexers sharing a common output-enable (OE) input and select line (A/B). Each channel selects between A and B inputs based on the logic level of A/B, with outputs placed in high-impedance state when OE is high. Its EPIC CMOS process ensures latch-up immunity up to 500 mA at 125°C.
It supports flow-through pin architecture-inputs on one side, outputs on the opposite-with center-pin VCC and GND placements to minimize switching noise. All inputs accept TTL-level voltages (VIH = 2 V min, VIL = 0.8 V max), while outputs drive ±24 mA into loads within 0–5.5 V range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems and stable operation across industrial voltage tolerances. |
| Propagation Delay (tPLH/tPHL) | 1.5 ns min / 6.9 ns max - guarantees sub-7 ns signal routing critical for synchronous bus arbitration and clock-domain crossing in backplane designs. |
| Output Drive (IOL/IOH) | ±24 mA - sufficient to directly interface with multiple TTL loads or drive 50 Ω transmission lines without external buffers. |
| Input Voltage Thresholds | VIH = 2 V min, VIL = 0.8 V max - enables reliable interfacing with legacy TTL logic families without level-shifting circuitry. |
| Operating Temperature | −40°C to +85°C - qualified for use in industrial automation, telecom line cards, and embedded control systems exposed to wide ambient conditions. |
| Power Dissipation (DW pkg) | 1.6 W max at TA = 55°C - defines thermal derating limits for PCB layout in dense logic arrays with forced-air or natural convection cooling. |
| 3-State Leakage (IOZ) | ±5 µA max at VCC = 5.5 V - ensures minimal bus contention current during output disable, preserving signal integrity in shared-data-path architectures. |
Pinout & Package
74ACT11257DW uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.5 mm width, and 2.65 mm max height. Pin 1 identifier is located at top-left corner with notch or beveled edge marking orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 17, 18, 19, 20 | Data Inputs (1A–4A, 1B–4B), Select (A/B), Output Enable (OE) | Four pairs of source inputs per MUX channel; single global select and enable control all four outputs simultaneously. |
| 9, 10, 15, 16 | Outputs (1Y–4Y) | 3-state outputs that present high-Z when OE = high; otherwise drive selected A/B input with rail-to-rail CMOS levels. |
| 10, 11, 12, 13 | GND | Four dedicated ground pins reduce ground bounce and improve noise margin in high-speed switching. |
| 14, 15 | VCC | Two centrally located power pins minimize supply impedance and decoupling loop area for clean switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Voltage-Compatible Inputs | Accepts standard 0.8 V / 2.0 V logic thresholds - eliminates need for input level shifters when interfacing with legacy 74LS or 74F logic. |
| Flow-Through Pin Architecture | Inputs on left side, outputs on right side - simplifies PCB trace routing and reduces layer count in dense bus interfaces. |
| Center-Pin VCC/GND Configuration | VCC and GND placed at pins 14/15 and 10/11 respectively - lowers simultaneous switching noise by shortening power/ground return paths. |
| EPIC 1-µm CMOS Process | Delivers 500 mA latch-up immunity at 125°C - enables robust operation in thermally stressed environments without external protection. |
| Bus-Interface Optimized Outputs | 3-state outputs with ±24 mA drive and low IOZ leakage - allows direct connection to shared data buses without contention or signal degradation. |
Applications
| Industrial PLC Backplane | Digital Test Equipment Bus Switching |
|---|---|
Use Scenario: Routing sensor data streams from multiple I/O modules onto a central diagnostic bus in programmable logic controllers. IC Role / Device Role / Timing Role: Quad 2:1 MUX selects active sensor channel per cycle under microcontroller command; OE disables unused channels to prevent bus loading. Use Value: Enables deterministic time-sliced data acquisition with <7 ns propagation delay and zero added latency from buffering stages. | Use Scenario: Dynamically reconfiguring signal paths between DUT ports and measurement instruments in automated test systems. IC Role / Device Role / Timing Role: Acts as a programmable signal router controlled by FPGA GPIO; A/B selects instrument vs. reference source per channel. Use Value: Supports sub-10 ns path switching with guaranteed 3-state isolation, eliminating cross-talk during reconfiguration sequences. |
| Legacy System Logic Upgrade | Embedded Control Data Multiplexing |
Use Scenario: Replacing obsolete 74LS257 or 74F257 in aging avionics or medical equipment where footprint and function must match. IC Role / Device Role / Timing Role: Drop-in compatible logic replacement with identical pinout and truth table; operates at higher speed and lower power than bipolar predecessors. Use Value: Extends system life without PCB redesign, delivering 4× lower ICC quiescent current and improved noise immunity over LS/F families. | Use Scenario: Consolidating status signals from four motor drivers onto a single microcontroller input port in motion-control systems. IC Role / Device Role / Timing Role: Time-multiplexes four independent status bits (e.g., fault, ready, limit, brake) onto one GPIO line using A/B and OE sequencing. Use Value: Reduces MCU pin count requirement by 75% while maintaining real-time visibility via synchronized read cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT257N | DIP-16 package; identical logic function and AC/DC specs but different pinout and fewer GND/VCC pins. | Limited to through-hole prototyping or legacy DIP-based systems; lacks SOIC thermal and noise advantages. | Select when board requires DIP footprint or manual soldering; verify layout compatibility due to non-identical pin mapping. |
| 74ACT157DWR | Same SOIC-16 package; quad 2:1 MUX but only two outputs enabled per device (vs. four on 74ACT11257DW). | Requires two devices to replicate full 4-output functionality; increases board area and supply current. | Choose only if existing design already uses 74ACT157 footprint and can accommodate dual-device implementation. |
Compared with SN74ACT257N and 74ACT157DWR, the 74ACT11257DW provides four fully independent 3-state outputs in a single SOIC-20 package with optimized power-ground pin distribution-making it superior for new industrial PCB designs requiring bus noise control, space efficiency, and drop-in replaceability for legacy 74ACT257-based layouts.
Availability
74ACT11257DW is available at Aetrix Electronics and suitable for industrial PLC backplanes, digital test equipment bus switching, and embedded control data multiplexing requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT11257DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74ACT11257DW belongs to TI's advanced CMOS logic family built on EPIC process technology, engineered specifically for high-speed, low-noise bus interface applications in industrial control and instrumentation systems.
FAQ
What is the maximum supply voltage rating for the 74ACT11257DW?
The 74ACT11257DW has an absolute maximum supply voltage (VCC) rating of 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this range may cause parametric deviation or reliability degradation. The 74ACT11257DW is not rated for 3.3 V operation and requires a stable 5 V rail for guaranteed timing and logic-level compliance.
Does the 74ACT11257DW support true bidirectional data routing?
No, the 74ACT11257DW is a unidirectional multiplexer: data flows only from inputs (A/B) to outputs (Y). It does not support reverse signal flow or bus transceiver functionality. The 74ACT11257DW outputs are 3-state but not bidirectional; they cannot accept incoming data when enabled. For bidirectional applications, discrete transceivers or dedicated bus switches must be used instead.
How many ground and power pins does the 74ACT11257DW have, and why?
The 74ACT11257DW has four GND pins (pins 10, 11, 12, 13) and two VCC pins (pins 14, 15), positioned centrally to minimize switching noise. This configuration reduces ground bounce and improves signal integrity during simultaneous output transitions. The 74ACT11257DW's multi-GND/VCC layout is a key differentiator from older 16-pin equivalents and directly supports its use in high-speed bus environments.
Is the 74ACT11257DW pin-compatible with the 74ACT257 or 74LS257?
No, the 74ACT11257DW is not pin-compatible with the 74ACT257 or 74LS257. While functionally similar (quad 2:1 MUX), the 74ACT11257DW uses a 20-pin SOIC (DW) package with dedicated GND/VCC pins and flow-through routing, whereas 74ACT257/74LS257 use 16-pin packages (DIP/SOIC) with different pin assignments. The 74ACT11257DW requires PCB layout adaptation but offers superior noise performance and thermal handling.
What is the purpose of the A/B input on the 74ACT11257DW?
On the 74ACT11257DW, the A/B input is a global select line that determines which of the two data sources (A or B) is routed to each of the four Y outputs. When A/B = low, all Y outputs reflect their corresponding A inputs; when A/B = high, all Y outputs reflect their corresponding B inputs. This single-line control simplifies synchronization across all four channels and is distinct from per-channel select architectures found in other MUX families.
74ACT11257DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74ACT11257DW FAQ
1.How can I place an order for 74ACT11257DW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11257DW 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 74ACT11257DW reliable?
The price and inventory of 74ACT11257DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11257DW is usually 5 days.
3.What payment methods are accepted for 74ACT11257DW?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11257DW?
74ACT11257DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11257DW 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 74ACT11257DW?
For technical support, including 74ACT11257DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11257DW requirements.
6.How does Aetrix verify that 74ACT11257DW is sourced from the original manufacturer or authorized distributors?
All 74ACT11257DW 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 74ACT11257DW meets industry standards.
7.What is the process for return or replacement of 74ACT11257DW?
All 74ACT11257DW units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11257DW, 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 74ACT11257DW part is unused and in its original packaging.
Return procedure for 74ACT11257DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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