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Texas Instruments 74ACT11257PWR
- Part No.:
- 74ACT11257PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT11257PWR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,933
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Product details
Overview
74ACT11257PWR from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems. It supports 5-V operation (4.5–5.5 V), delivers ±24 mA output drive, achieves 1.5 ns minimum propagation delay, and operates across −40°C to 85°C. It interfaces four independent 2-source data buses to four output lines under select and enable control.
For engineers reviewing the 74ACT11257PWR datasheet, 74ACT11257PWR pinout, 74ACT11257PWR application, or 74ACT11257PWR equivalent, key selection criteria include TTL-compatible inputs, flow-through pinout for PCB layout optimization, 3-state bus interface capability, latch-up immunity (500 mA at 125°C), and SOIC-20 package compatibility with industrial temperature range requirements.
Technical Context
The 74ACT11257PWR implements four independent 2:1 multiplexers, each selecting between A and B inputs based on the shared A/B select line. All outputs are controlled by a common active-low output-enable (OE) signal, enabling simultaneous high-impedance state for bus isolation.
Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process ensures TTL-voltage compatibility at the inputs while delivering CMOS-level power efficiency and noise immunity. Center-pin VCC and GND placements suppress high-speed switching noise in dense layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation across standard 5-V supply tolerances in industrial systems. |
| Output Drive | ±24 mA - Sufficient to directly drive standard TTL loads without external buffers. |
| Propagation Delay | 1.5 ns min (A/B → Y) - Supports high-speed data routing in timing-critical bus arbitration paths. |
| Operating Temp | −40°C to +85°C - Qualified for extended industrial environments without derating. |
| Latch-Up Immunity | 500 mA typical at 125°C - Meets stringent reliability requirements for mission-critical logic interfacing. |
| Input Compatibility | TTL-voltage - Accepts standard 0.8 V/2.0 V logic thresholds, simplifying mixed-logic system integration. |
| Power Dissipation | 1.6 W max (DW package, still air) - Enables thermal management with standard SOIC footprint and board copper. |
Pinout & Package
74ACT11257PWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm, with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) | Eight independent source inputs grouped into four 2-input pairs for multiplexing. |
| 9 | Output Enable (OE) | Active-low global control: drives all outputs to high-impedance when high. |
| 10, 11, 12, 13 | Outputs (1Y, 2Y, 3Y, 4Y) | Four buffered, 3-state outputs corresponding to selected inputs per channel. |
| 14, 15, 16, 17 | GND | Four dedicated ground terminals minimize ground bounce and improve noise margin. |
| 18, 19 | VCC | Two dedicated power pins reduce supply impedance and stabilize switching transients. |
| 20 | Select (A/B) | Single global select line determining whether A or B input is routed to each Y output. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins arranged on opposite sides (pins 1–8 and 10–13) to eliminate layer jumps and reduce trace length in PCB routing. |
| Center-pin VCC/GND | VCC (pins 18–19) and GND (pins 14–17) placed centrally to lower inductance and suppress simultaneous switching noise. |
| TTL-compatible inputs | VIH = 2.0 V, VIL = 0.8 V - Interoperates directly with legacy TTL logic without level-shifting circuitry. |
| 3-state bus interface | OE-controlled high-impedance outputs allow safe connection to shared data buses without contention. |
| EPIC CMOS process | Combines speed of bipolar with low power and latch-up immunity of CMOS, validated at 125°C. |
Applications
| Industrial PLC Backplane Bus Switching | Legacy System Data Path Multiplexing |
|---|---|
Use Scenario: Routing sensor or I/O module data from dual redundant sources onto a single backplane data lane in programmable logic controllers. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing deterministic source selection per channel under firmware-controlled OE and A/B signals. Use Value: Eliminates need for discrete logic gates or FPGA resources; enables hot-swap-safe bus isolation via 3-state control. | Use Scenario: Consolidating parallel data streams from multiple legacy peripherals (e.g., UARTs, timers, ADCs) onto a shared microcontroller data bus. IC Role / Device Role / Timing Role: Bus interface multiplexer synchronizing asynchronous peripheral outputs to CPU read cycles using OE-gated timing. Use Value: Reduces address decoding complexity and PCB real estate versus discrete gate solutions; supports TTL-level peripheral compatibility. |
| Test Equipment Signal Routing Matrix | Embedded Controller Peripheral Selection |
Use Scenario: Configurable signal path selection in automated test equipment where multiple DUT inputs must be dynamically assigned to measurement channels. IC Role / Device Role / Timing Role: High-speed data selector enabling sub-10 ns path reconfiguration during test sequence execution. Use Value: Achieves deterministic routing latency and low crosstalk due to flow-through pinout and dedicated VCC/GND pins. | Use Scenario: Selecting between alternate peripheral interfaces (e.g., SPI vs. parallel memory, dual UARTs) on resource-constrained microcontrollers. IC Role / Device Role / Timing Role: Hardware-based peripheral mux reducing software overhead and interrupt latency in real-time control loops. Use Value: Provides glitch-free switching via synchronized OE control and eliminates software polling delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT157N | 16-pin PDIP; single OE per pair (not global); no center-pin VCC/GND; higher ICC (100 μA typical) | Limited to space-constrained through-hole designs; less effective noise suppression in high-speed layouts | Prefer 74ACT11257PWR for SOIC-based industrial PCBs requiring optimized EMI performance and bus isolation. |
| 74ACT257DWR | Same DW package; identical pinout and function; TI-marked variant with identical specs and qualification | No functional or mechanical difference; differs only in orderable part number and reel packaging | 74ACT11257PWR and 74ACT257DWR are functionally and pin-compatible; selection depends on inventory and tape-and-reel configuration needs. |
Compared with SN74ACT157N and 74ACT257DWR, the 74ACT11257PWR offers superior PCB layout optimization via flow-through architecture and enhanced noise immunity from distributed VCC/GND pins-critical for stable operation in electrically noisy industrial environments.
Availability
74ACT11257PWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system data consolidation, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for 74ACT11257PWR 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 ICs with broad industrial, automotive, and aerospace qualifications.
The 74ACT11257PWR belongs to TI's ACT (Advanced CMOS TTL-compatible) logic family, engineered for high-speed, low-noise bus interfacing in industrial control and instrumentation systems.
FAQ
What is the operating voltage range for the 74ACT11257PWR?
The 74ACT11257PWR operates over a supply voltage range of 4.5 V to 5.5 V. This specification ensures reliable functionality across standard 5-V rail tolerances in industrial power supplies. The device is not rated for 3.3-V operation, and applying voltages outside this range may cause permanent damage or undefined behavior. Always verify VCC stability within these limits during system power-up and transient conditions.
Does the 74ACT11257PWR support true 3-state outputs, and how is output enable controlled?
Yes, the 74ACT11257PWR features true 3-state outputs controlled by an active-low Output Enable (OE) input on pin 9. When OE is high, all four Y outputs enter high-impedance state regardless of A/B or data inputs. When OE is low, outputs reflect the selected A or B input per channel. This enables clean bus sharing without contention, and the 3-state leakage (IOZ) is specified at ±0.5 µA max at 5.5 V.
What package type and dimensions does the 74ACT11257PWR use?
The 74ACT11257PWR uses a 20-pin SOIC (DW) package with body dimensions of 12.8 mm × 7.5 mm and maximum height of 2.65 mm. It features gull-wing leads, NiPdAu terminal finish, and complies with JEDEC MS-013. The DW package is distinct from N (DIP) and DB (SSOP) variants-pin compatibility exists only within the DW footprint, and thermal dissipation is rated at 1.6 W in still air.
How does the flow-through pinout of the 74ACT11257PWR benefit PCB layout?
The flow-through architecture places inputs (pins 1–8) on the left side and outputs (pins 10–13) on the right side, with OE (pin 9) and select (pin 20) positioned to minimize signal crossing. This arrangement allows straight-layer routing without vias or layer changes, reducing parasitic inductance and crosstalk. Combined with center-placed VCC (pins 18–19) and GND (pins 14–17), it significantly improves signal integrity in high-density industrial PCBs.
Is the 74ACT11257PWR compatible with TTL logic families, and what are the input threshold levels?
Yes, the 74ACT11257PWR features TTL-voltage compatible inputs: VIH = 2.0 V (min) and VIL = 0.8 V (max) at VCC = 5.5 V. This allows direct interfacing with standard 74LS, 74F, and other TTL-series outputs without level shifters. Input current is limited to ±1 µA max, ensuring minimal loading on upstream drivers. The device does not support CMOS-level (e.g., 3.3-V) input thresholds natively.
74ACT11257PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
74ACT11257PWR FAQ
1.How can I place an order for 74ACT11257PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11257PWR 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 74ACT11257PWR reliable?
The price and inventory of 74ACT11257PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11257PWR is usually 5 days.
3.What payment methods are accepted for 74ACT11257PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11257PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11257PWR?
74ACT11257PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11257PWR 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 74ACT11257PWR?
For technical support, including 74ACT11257PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11257PWR requirements.
6.How does Aetrix verify that 74ACT11257PWR is sourced from the original manufacturer or authorized distributors?
All 74ACT11257PWR 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 74ACT11257PWR meets industry standards.
7.What is the process for return or replacement of 74ACT11257PWR?
All 74ACT11257PWR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11257PWR, 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 74ACT11257PWR part is unused and in its original packaging.
Return procedure for 74ACT11257PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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