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Texas Instruments 74ACT11251D
- Part No.:
- 74ACT11251D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
74ACT11251D.pdf
- Description:
- MUX, ACT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:1,680
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Product details
Overview
74ACT11251D from Texas Instruments is a high-speed 8-to-1 data selector/multiplexer with complementary 3-state outputs, TTL-compatible inputs, and EPIC™ 1-µm CMOS process technology. It operates from −40°C to 85°C at 4.5–5.5 V, delivers 24 mA output drive, and supports parallel-to-serial conversion in bus-oriented systems.
For engineers reviewing the 74ACT11251D datasheet, 74ACT11251D pinout, 74ACT11251D application, or 74ACT11251D equivalent, this device is selected for high-noise-immunity data routing in legacy industrial control backplanes, where flow-through architecture, center-pin VCC/GND layout, and latch-up immunity (500 mA at 125°C) are critical design requirements.
Technical Context
The 74ACT11251D implements full binary decoding of A/B/C address inputs to select one of eight data sources (D0–D7), with strobe-controlled (G) complementary outputs Y and W. Both outputs are simultaneously enabled or disabled-no independent control-ensuring true/inverted data pairs remain synchronized during bus driving.
Its EPIC™ process enables TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V) while maintaining CMOS power efficiency (ICC ≤ 80 µA), and its flow-through pinout minimizes trace crossings. The center-pin VCC/GND configuration reduces simultaneous switching noise, critical for stable operation in dense PCB layouts with multiple active devices.
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 logic rails without level shifting. |
| Output Drive | ±24 mA - sufficient to directly drive terminated system bus lines without external buffers. |
| Propagation Delay | 2.0–11.4 ns (max @ 25°C) - supports >80 MHz data throughput in synchronous bus applications. |
| Input Compatibility | TTL-level (VIH ≥ 2 V, VIL ≤ 0.8 V) - interfaces seamlessly with legacy 74LS/74F logic without pull-ups or translators. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and test equipment. |
| Latch-Up Immunity | 500 mA typical @ 125°C - exceeds JEDEC JESD78 Class II requirements, enabling robust operation under transient stress. |
| Power Dissipation Cap. | 60 pF (outputs enabled) - enables accurate dynamic power estimation for thermal design in multi-device systems. |
Pinout & Package
74ACT11251D is packaged in a 16-pin plastic small-outline integrated circuit (SOIC) with D package drawing, featuring center-pin VCC (Pin 14) and GND (Pin 8) for low-noise power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | Data Input 0 | Low-order data source selected when A=B=C=0; electrically identical to D1–D7. |
| 2 (G) | Strobe Control | Active-low enable: Y/W outputs enter high-impedance state when G = HIGH. |
| 3 (Y) | In-Phase Output | 3-state complementary output mirroring selected Dn input; drives bus line to logic HIGH/LOW. |
| 4 (GND) | Ground Reference | Center-pin ground plane minimizes return-path inductance and switching noise coupling. |
| 5 (W) | Inverted Output | Complementary to Y; provides true/inverted pair for differential signaling or redundancy. |
| 6 (A) | Address Bit 0 | LSB of 3-bit binary select code; determines D0–D7 routing path through internal decoder. |
| 7 (B) | Address Bit 1 | Mid-bit of select code; combined with A and C, fully decodes one-of-eight selection. |
| 8 (C) | Address Bit 2 | MSB of select code; completes full binary decoding for deterministic multiplexing. |
| 9–13 (D1–D7) | Data Inputs 1–7 | Remaining seven data sources; all share identical electrical specs and timing behavior. |
| 14 (VCC) | Supply Voltage | Center-pin VCC reduces supply rail impedance asymmetry and improves PSRR at high frequencies. |
| 15–16 (D5, D6) | Data Inputs 5–6 | Part of same 8-input set; no functional distinction from D0–D4 or D7 beyond address mapping. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-Through Architecture | Input pins (A/B/C/Dn) on left side and outputs (Y/W/G) on right side minimize PCB trace crossovers and reduce signal skew. |
| Center-Pin VCC/GND | Reduces simultaneous switching noise by shortening high-frequency return paths-critical for EMI-sensitive bus systems. |
| Complementary 3-State Outputs | Y and W provide matched timing and drive strength for true/inverted data transmission without external inverters. |
| TTL-Voltage Compatible Inputs | Accepts standard 74LS/74F logic levels directly, eliminating interface resistors or level-shifter ICs in mixed-logic designs. |
| EPIC™ 1-µm CMOS Process | Delivers speed/power balance: propagation delays comparable to bipolar logic with CMOS static power consumption. |
Applications
| Industrial Backplane Data Routing | Legacy Test Equipment Signal Switching |
|---|---|
Use Scenario: Routing sensor data from eight analog front-end channels onto a shared 8-bit microcontroller data bus in programmable logic controllers. IC Role / Device Role / Timing Role: 8-to-1 multiplexer with strobe-gated 3-state outputs enables time-sliced acquisition without bus contention. Use Value: Flow-through pinout simplifies PCB layout in space-constrained DIN-rail mounted I/O modules, reducing layer count and cost. |
Use Scenario: Selecting between eight calibrated reference voltages for DAC-based precision voltage sourcing in automated test systems. IC Role / Device Role / Timing Role: Data selector providing synchronized true/inverted outputs to feed dual-path ADC comparison circuits. Use Value: Complementary outputs eliminate need for discrete inverters, improving timing match and reducing component count by 25% per channel. |
| Embedded System Boot Configuration | High-Noise Factory Floor Bus Interface |
Use Scenario: Reading hardware strap options from eight DIP-switch positions during MCU boot to configure peripheral enable states and memory mapping. IC Role / Device Role / Timing Role: Static address decoder translating mechanical switch states into digital configuration bits for early-boot firmware. Use Value: TTL-compatible inputs tolerate contact bounce and long switch traces without debouncing circuitry, reducing BOM and board area. |
Use Scenario: Isolating and routing diagnostic signals across noisy 24-VDC industrial bus segments in motor drive cabinets. IC Role / Device Role / Timing Role: Strobe-controlled multiplexer acting as a noise-resilient data gate between isolated CAN node controllers and shared diagnostics port. Use Value: 500-mA latch-up immunity prevents catastrophic failure during ESD events common in unshielded factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-to-1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT151D | Same function, identical pinout (SOIC-16), but lacks complementary outputs-only Y output provided. | Cannot support true/inverted data pair generation; requires external inverter for W-equivalent signal. | Select 74ACT151D only if complementary outputs are unnecessary and board space permits added inverter. |
| SN74LS151N | Bipolar TTL implementation; higher ICC (40 mA typical), slower propagation (15–25 ns), and no 3-state outputs-requires external bus drivers. | Not suitable for direct bus interfacing; limited to point-to-point logic interconnect with pull-up resistors. | Choose SN74LS151N only for pure TTL-only systems where power and speed are secondary to legacy compatibility. |
Compared with 74ACT11251D, the 74ACT151D saves cost but sacrifices signal integrity in differential bus applications, while the SN74LS151N introduces layout complexity and thermal overhead due to higher static current and lack of 3-state control-making 74ACT11251D optimal for modernized industrial backplane upgrades requiring noise resilience and bus integration.
Availability
74ACT11251D is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test equipment refurbishment, and embedded boot configuration systems requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT11251D 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 global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74ACT11251D belongs to TI's advanced CMOS logic family designed for high-speed, low-noise data routing in industrial and instrumentation systems where reliability, bus compatibility, and layout efficiency are prioritized over ultra-low power.
FAQ
What is the primary function of the 74ACT11251D?
The 74ACT11251D is an 8-to-1 data selector/multiplexer with complementary 3-state outputs. It uses three address inputs (A, B, C) to route one of eight data inputs (D0–D7) to both Y (true) and W (inverted) outputs, controlled by a single strobe (G) input. Its design targets bus-oriented systems requiring synchronized true/inverted data routing without external inversion.
Does the 74ACT11251D support 3.3-V operation?
No, the 74ACT11251D is specified only for 4.5 V to 5.5 V supply operation per its recommended operating conditions. It does not guarantee functionality or timing at 3.3 V, and applying 3.3 V to VCC may result in undefined output states or excessive ICC due to threshold mismatch in the EPIC™ process.
Can the Y and W outputs of the 74ACT11251D be controlled independently?
No-the 74ACT11251D provides only a single strobe input (G) that simultaneously enables or disables both Y and W outputs. There is no separate control for either output; they always operate in lockstep as a complementary pair, ensuring timing alignment critical for differential signaling paths.
What does "flow-through architecture" mean for the 74ACT11251D?
Flow-through architecture refers to the physical pin arrangement: data/address inputs occupy pins 1–8 on the left side of the SOIC package, while outputs (Y, W, G) and power pins (VCC, GND) occupy pins 9–16 on the right side. This layout allows straight-line PCB routing, minimizing trace length, crosstalk, and layer transitions in high-density designs.
Is the 74ACT11251D still in active production?
No-the 74ACT11251D is marked OBSOLETE by Texas Instruments per its official packaging information. However, Aetrix Electronics maintains verified legacy stock with full traceability and supports long-term supply for industrial maintenance and repair programs requiring exact form-fit-function replacement.
74ACT11251D 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74ACT11251D FAQ
1.How can I place an order for 74ACT11251D through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11251D 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 74ACT11251D reliable?
The price and inventory of 74ACT11251D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11251D is usually 5 days.
3.What payment methods are accepted for 74ACT11251D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11251D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11251D?
74ACT11251D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11251D 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 74ACT11251D?
For technical support, including 74ACT11251D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11251D requirements.
6.How does Aetrix verify that 74ACT11251D is sourced from the original manufacturer or authorized distributors?
All 74ACT11251D 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 74ACT11251D meets industry standards.
7.What is the process for return or replacement of 74ACT11251D?
All 74ACT11251D units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11251D, 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 74ACT11251D part is unused and in its original packaging.
Return procedure for 74ACT11251D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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