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Texas Instruments 74ACT11257PW
- Part No.:
- 74ACT11257PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT11257PW.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,698
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Product details
Overview
74ACT11257PW from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems requiring signal routing from four 4-bit data sources. It operates at 4.5–5.5 V, supports –40°C to 85°C ambient, delivers ±24 mA output drive, and features 1.5–9.6 ns propagation delays. It interfaces directly with system buses via TTL-compatible inputs and high-impedance outputs.
For engineers reviewing the 74ACT11257PW datasheet, 74ACT11257PW pinout, 74ACT11257PW application, or 74ACT11257PW equivalent, key selection criteria include its 20-pin TSSOP package, flow-through pin architecture for PCB layout optimization, center-pin VCC/GND configuration for noise reduction, and EPIC-process-based latch-up immunity of 500 mA at 125°C.
Technical Context
The 74ACT11257PW implements four independent 2:1 multiplexers, each selecting between A and B inputs based on the A/B control line, with individual 3-state enable (OE) control per output group. Its logic function is defined by a verified truth table specifying Z (high-impedance) output when OE is high, and pass-through behavior when OE is low.
It uses Texas Instruments' EPIC (Enhanced-Performance Implanted CMOS) 1-μm process, enabling TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V) while maintaining CMOS power efficiency. The device exhibits measured switching characteristics including tPLH/tPHL ≤ 8.7 ns and tPZL/tPHZ ≤ 9.6 ns under 5-V operation at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS system rails without level-shifting. |
| Operating Temperature | –40°C to 85°C - Qualified for industrial-grade embedded and computing applications. |
| Output Drive | ±24 mA - Sufficient to drive multiple TTL loads or terminate short stubs on shared data buses. |
| Propagation Delay | 1.5–8.7 ns - Enables use in high-speed bus multiplexing up to ~100 MHz clock-equivalent systems. |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - Directly accepts legacy TTL logic outputs without interface circuitry. |
| Latch-Up Immunity | 500 mA typical at 125°C - Meets JEDEC JESD78 requirements for robustness in noisy or thermally stressed environments. |
| Power Dissipation Capacitance | 41 pF (enabled), 13 pF (disabled) - Quantifies dynamic power consumption during active and quiescent states. |
Pinout & Package
74ACT11257PW is housed in a 20-pin Thin Shrink Small-Outline Package (TSSOP), compliant with JEDEC MO-153, measuring 6.6 mm × 4.4 mm × 1.2 mm, with 0.65 mm lead pitch and gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A, 1B, 2A, 2B | Data inputs for first two multiplexers - Flow-through placement minimizes trace crossovers on PCB. |
| 5, 6, 7, 8 | GND (×4) | Four dedicated ground pins - Center-clustered to reduce ground bounce and improve high-speed switching noise margin. |
| 9 | OE | Global output-enable control - Active-low; places all Y outputs in high-impedance state when asserted. |
| 10, 11, 12, 13 | 1Y, 2Y, 3Y, 4Y | 3-state multiplexed outputs - Drive system bus directly; high-Z when OE = high. |
| 14, 15 | A/B, 1A | Multiplexer select and input pair - A/B controls source selection (A or B) across all four channels simultaneously. |
| 16, 17, 18, 19 | VCC (×4) | Four dedicated supply pins - Symmetrically placed with GND to stabilize power delivery and suppress simultaneous switching noise. |
| 20 | 4B | Final data input - Completes quad 2:1 structure; pin 20 location enables linear I/O routing. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins arranged on opposite sides (pins 1–4/20 vs. 10–13) to eliminate layer jumps and reduce signal path length on PCB. |
| Center-pin VCC and GND | Four VCC (pins 16–19) and four GND (pins 5–8) clustered centrally - lowers inductance and improves PSRR above 10 MHz. |
| TTL-voltage compatible inputs | VIH = 2 V min, VIL = 0.8 V max - Interoperates with legacy 74LS/74ALS logic without level translators or pull-ups. |
| 3-state bus interface | Outputs fully disconnect (Z-state) when OE = high - Prevents bus contention in multi-source shared-data architectures. |
| EPIC 1-μm CMOS process | Enables 500 mA latch-up immunity and <10 ns propagation - Delivers robustness and speed previously limited to bipolar technologies. |
Applications
| Backplane Bus Arbitration | Legacy System Data Muxing |
|---|---|
|
Use Scenario: Selecting among four parallel data sources (e.g., CPU, DMA, peripheral, memory) onto a single 4-bit bidirectional backplane bus. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing source-select arbitration with simultaneous 3-state control via OE. Use Value: Eliminates need for discrete logic gates or larger mux ICs; flow-through pinout reduces routing congestion on dense backplane layouts. |
Use Scenario: Adapting older 4-bit microprocessor subsystems (e.g., Z80, 8085) to share data paths with newer peripherals using common bus infrastructure. IC Role / Device Role / Timing Role: Level-translating bus interface element that accepts TTL inputs and drives CMOS-compatible loads with controlled timing. Use Value: TTL-compatible thresholds ensure reliable recognition of legacy logic levels; ±24 mA drive sustains signal integrity over extended trace lengths. |
| Industrial PLC I/O Expansion | Test Equipment Signal Routing |
|
Use Scenario: Multiplexing sensor inputs (e.g., analog front-end digitizers, encoder interfaces) into a centralized controller's 4-bit data acquisition port. IC Role / Device Role / Timing Role: Deterministic, low-latency signal selector enabling synchronized sampling across multiple channels. Use Value: Guaranteed 8.7 ns max tPHL ensures sub-10 ns channel switching - critical for time-critical I/O sequencing in deterministic PLC cycles. |
Use Scenario: Configurable signal path routing inside automated test equipment (ATE) to connect DUT pins to measurement instruments or stimulus sources. IC Role / Device Role / Timing Role: Reconfigurable 4-channel data switch supporting rapid test sequence changes via OE and A/B control lines. Use Value: 3-state outputs prevent signal leakage during reconfiguration; center-pin power/ground minimizes switching noise affecting sensitive measurements. |
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 |
|---|---|---|---|
| SN74ACT157DR | Single 2:1 quad mux with shared A/B and OE; identical 20-pin SOIC (DW) package but lacks TSSOP (PW) variant. | Same logic function and DC specs, but only offered in SOIC - unsuitable for space-constrained TSSOP designs. | Select SN74ACT157DR only if board layout accommodates SOIC and TSSOP footprint is unavailable. |
| 74LVC157APW | Lower voltage (1.65–3.6 V), smaller drive (±24 mA @ 3.3 V), and 14-pin TSSOP - not pin-compatible and lacks dual-rail capability. | Designed for 3.3-V systems; incompatible with 5-V bus environments where 74ACT11257PW operates. | Choose 74LVC157APW only for new 3.3-V designs; not a drop-in replacement due to voltage range, pin count, and package mismatch. |
Compared with SN74ACT157DR and 74LVC157APW, the 74ACT11257PW uniquely combines 5-V operation, 20-pin TSSOP packaging, and flow-through pinout - making it the sole option for industrial 5-V bus multiplexing where board area and noise control are critical.
Availability
74ACT11257PW is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and automated test equipment requiring stable component supply and long-lifecycle support.
Supply support for 74ACT11257PW 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 with global manufacturing and quality certification.
The 74ACT11257PW belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise 5-V digital systems where TTL compatibility and bus interfacing are essential.
FAQ
What is the operating voltage range for the 74ACT11257PW?
The 74ACT11257PW operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures full functionality and specified performance-including propagation delay, output drive, and noise margins-across industrial temperature conditions (–40°C to 85°C). Operation outside this range may result in undefined logic states or reliability degradation.
Does the 74ACT11257PW support TTL-level input signals?
Yes, the 74ACT11257PW features TTL-voltage compatible inputs with VIH ≥ 2.0 V and VIL ≤ 0.8 V, allowing direct connection to standard 74LS, 74ALS, and other TTL-family outputs without level-shifting circuitry. This compatibility is confirmed in the recommended operating conditions table of the official SCAS053B datasheet.
What is the maximum propagation delay of the 74ACT11257PW at 5 V?
The maximum propagation delay for the 74ACT11257PW at VCC = 5 V and TA = 25°C is 8.7 ns (tPHL from A/B to Y). Under worst-case industrial temperature (85°C) and minimum VCC (4.5 V), the datasheet specifies tPHL ≤ 9.4 ns - ensuring predictable timing in synchronous bus architectures.
Is the 74ACT11257PW pin-compatible with other packages in the same logic family?
No, the 74ACT11257PW (20-pin TSSOP) is not pin-compatible with the DW (SOIC) or DB (SSOP) variants of the same device. While all share identical logic functions and pin assignments, mechanical differences-including body size, lead pitch, and thermal pad presence-prevent direct PCB substitution without layout revision.
What does the "PW" suffix indicate in the 74ACT11257PW part number?
The "PW" suffix denotes Texas Instruments' standardized package code for the 20-pin Thin Shrink Small-Outline Package (TSSOP), per JEDEC MO-153. This distinguishes it from DW (SOIC), DB (SSOP), and N (PDIP) variants - all sharing the same 74ACT11257 logic but differing in footprint, thermal performance, and mounting requirements.
74ACT11257PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
74ACT11257PW FAQ
1.How can I place an order for 74ACT11257PW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11257PW 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 74ACT11257PW reliable?
The price and inventory of 74ACT11257PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11257PW is usually 5 days.
3.What payment methods are accepted for 74ACT11257PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11257PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11257PW?
74ACT11257PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11257PW 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 74ACT11257PW?
For technical support, including 74ACT11257PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11257PW requirements.
6.How does Aetrix verify that 74ACT11257PW is sourced from the original manufacturer or authorized distributors?
All 74ACT11257PW 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 74ACT11257PW meets industry standards.
7.What is the process for return or replacement of 74ACT11257PW?
All 74ACT11257PW units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11257PW, 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 74ACT11257PW part is unused and in its original packaging.
Return procedure for 74ACT11257PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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