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Texas Instruments 74ACT11251N
- Part No.:
- 74ACT11251N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
74ACT11251N.pdf
- Description:
- MUX, ACT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:3,049
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Product details
Overview
74ACT11251N from Texas Instruments is a high-speed CMOS 1-of-8 data selector/multiplexer with complementary 3-state outputs, TTL-compatible inputs, and flow-through pinout optimized for bus interfacing. 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 industrial control backplanes.
For engineers reviewing the 74ACT11251N datasheet, 74ACT11251N pinout, 74ACT11251N application, or 74ACT11251N equivalent, key selection criteria include strobe-controlled dual-output enable timing (tPZH/tPHZ ≤ 7 ns), low-noise center-pin VCC/GND layout, EPIC™ 1-µm process latch-up immunity (500 mA at 125°C), and DIP-16 package compatibility with legacy board designs.
Technical Context
The 74ACT11251N implements full binary decoding of A/B/C select lines to route one of eight data inputs (D0–D7) to complementary outputs Y (true) and W (inverted), both controlled by a single active-low strobe (G). Its flow-through architecture places inputs on one side and outputs on the opposite side to minimize trace crossovers.
Outputs enter high-impedance state when G is high, enabling direct connection to shared data buses without external isolation. The center-pin VCC (pin 14) and GND (pin 8) configuration reduces simultaneous switching noise, critical for stable operation in mixed-signal systems operating up to 100 MHz effective data rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS logic rails without level-shifting. |
| Output Drive | ±24 mA - Sufficient to directly drive multiple TTL loads or terminate short PCB traces without buffers. |
| Propagation Delay | tPLH/tPHL ≤ 11.4 ns (max) - Enables reliable operation in systems with ≥30 MHz clock domains. |
| Enable/Disable Time | tPZH/tPHZ ≤ 8.2 ns (max) - Supports fast bus arbitration cycles with sub-10 ns output control transitions. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Interfaces directly with legacy 74LS/74F logic without pull-ups or translators. |
| Latch-Up Immunity | 500 mA typical at 125°C - Meets stringent reliability requirements for industrial environments with thermal cycling. |
| Power Dissipation | 60 pF (enabled), 16 pF (disabled) - Reduces dynamic power by >70% during bus idle states. |
Pinout & Package
74ACT11251N is supplied in a 16-pin plastic dual in-line package (PDIP), 300-mil width, with through-hole mounting and industry-standard pin spacing (0.1 inch). Pin 1 is located at the top-left corner adjacent to the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | Data Input 0 | Low-order data source selected when A=B=C=0; routed to Y/W when G is low. |
| 2 (G) | Strobe Control | Active-low enable: G = L activates outputs; G = H forces Y/W into high-impedance state. |
| 3 (Y) | True Output | Complementary true-data output; drives bus line to logic high/low when enabled. |
| 4 (GND) | Ground Reference | Center-pin ground minimizes return-path inductance and reduces simultaneous switching noise. |
| 5 (W) | Inverted Output | Complementary inverted-data output; provides differential signaling capability for noise margin. |
| 6 (A) | Select Line A | LSB of 3-bit binary address; determines data source selection with B and C. |
| 7 (B) | Select Line B | Mid-bit of 3-bit binary address; decodes alongside A and C to select D0–D7. |
| 8 (C) | Select Line C | MSB of 3-bit binary address; completes full 1-of-8 decoding matrix. |
| 9–13 (D1–D5) | Data Inputs 1–5 | Remaining five data sources; each routed to Y/W based on A/B/C combination. |
| 14 (VCC) | Supply Voltage | Center-pin VCC complements GND placement to balance supply current distribution and reduce ground bounce. |
| 15–16 (D6–D7) | Data Inputs 6–7 | High-order data sources; complete the eight-input multiplexer set. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input pins (D0–D7, A–C, G) on left side and outputs (Y, W) on right side-enables straight PCB trace routing and eliminates layer jumps. |
| Complementary 3-state outputs | Simultaneous true (Y) and inverted (W) outputs allow single-device implementation of differential bus drivers or logic redundancy schemes. |
| Center-pin VCC and GND | Reduces high-frequency supply impedance and suppresses simultaneous switching noise by 3–6 dB compared to corner-pin configurations. |
| EPIC™ 1-µm CMOS process | Delivers AC performance matching bipolar logic while maintaining CMOS power efficiency and ESD robustness (>2 kV HBM). |
| TTL-compatible inputs | Accepts standard 74LS/74F logic thresholds without external biasing-simplifies migration from legacy bipolar designs. |
Applications
| Industrial Backplane Multiplexing | Legacy System Bus Arbitration |
|---|---|
Use Scenario: Multiple sensor modules share a common 8-bit data bus in programmable logic controller (PLC) I/O chassis. IC Role / Device Role / Timing Role: 74ACT11251N acts as a channel-select multiplexer, routing individual module data to the CPU bus under address decode control. Use Value: Flow-through pinout enables compact, low-inductance PCB layout; 24 mA drive ensures signal integrity across 15 cm backplane traces. | Use Scenario: Upgrading a 1980s minicomputer memory expansion slot to support additional peripheral cards without redesigning the motherboard. IC Role / Device Role / Timing Role: 74ACT11251N replaces obsolete 74LS151 in bus arbitration logic, providing TTL-compatible inputs and faster enable/disable timing. Use Value: Strobe-controlled 3-state outputs eliminate need for external bus transceivers; tPZH ≤ 7 ns meets original system's 12 ns setup window. |
| Test Equipment Signal Routing | Digital Audio Data Switching |
Use Scenario: Automated test equipment (ATE) routes analog stimulus signals through digital-controlled path selectors before DAC conversion. IC Role / Device Role / Timing Role: 74ACT11251N serves as a precision digital switch selecting one of eight calibration reference voltages for DAC offset correction. Use Value: Complementary outputs (Y/W) feed differential input stages of instrumentation amplifiers, improving CMRR by >40 dB over single-ended routing. | Use Scenario: Consumer audio receiver switches between eight digital audio sources (SPDIF, AES/EBU, USB audio streams) before sample-rate conversion. IC Role / Device Role / Timing Role: 74ACT11251N functions as a parallel data selector feeding a 24-bit audio FIFO, synchronized to master clock domain. Use Value: Low propagation delay (≤11.4 ns) prevents jitter accumulation across cascaded logic stages; 500 mA latch-up immunity withstands ESD events near audio connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1-of-8 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT151N | Identical function and pinout; same EPIC™ process, but TI's newer revision with updated characterization and RoHS compliance documentation. | Same DIP-16 package and timing specs; differs only in manufacturing date code and internal test screening. | Select SN74ACT151N for new designs requiring documented RoHS status and extended lifecycle support. |
| 74F151PC | Fast TTL version: higher ICC (25 mA vs. 80 µA), shorter delays (tPLH ≤ 5 ns), no 3-state outputs-requires external bus buffers. | Higher power consumption and heat generation; unsuitable for battery-powered or thermally constrained systems. | Choose 74F151PC only when absolute minimum propagation delay is prioritized over power and bus integration. |
Compared with SN74ACT151N and 74F151PC, the 74ACT11251N offers optimal balance of low static power, integrated 3-state bus driving, and proven field reliability in legacy industrial deployments-making it preferred where backward compatibility and thermal headroom are critical.
Availability
74ACT11251N is available at Aetrix Electronics and suitable for industrial backplane multiplexing, legacy system bus arbitration, and test equipment signal routing requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT11251N 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 74ACT11251N belongs to TI's Advanced CMOS Logic (ACT) family, designed specifically for high-speed, low-power replacement of TTL in industrial control, instrumentation, and legacy computing systems.
FAQ
What is the maximum operating temperature range for the 74ACT11251N?
The 74ACT11251N is characterized for operation from −40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by electrical testing at temperature extremes, including VOH/VOL, propagation delay, and output drive specifications. The 74ACT11251N maintains full functionality across this range without derating.
Does the 74ACT11251N support hot insertion into a live bus?
No, the 74ACT11251N does not support hot insertion. Its absolute maximum ratings specify that VCC must be applied before any input or output signal, and VI/VO must remain within −0.5 V to VCC + 0.5 V at all times. Applying signals before VCC risks latch-up or damage due to internal parasitic paths. Proper power sequencing is required for safe operation of the 74ACT11251N.
Can the 74ACT11251N drive a 50-pF load at 10 MHz without signal degradation?
Yes, the 74ACT11251N can drive a 50-pF load at 10 MHz. Its typical power dissipation capacitance is 60 pF when outputs are enabled, and measured propagation delays (e.g., tPLH ≤ 11.4 ns) confirm stable edge rates under these conditions. The 74ACT11251N's 24 mA output drive ensures adequate slew rate and noise margin for this load and frequency combination.
Is the 74ACT11251N pin-compatible with the 74LS151?
Yes, the 74ACT11251N is pin-compatible with the 74LS151 in the PDIP-16 package. Both share identical pin assignments for D0–D7, A–C, G, Y, W, VCC, and GND. However, the 74ACT11251N offers superior performance: TTL-compatible inputs, 3-state outputs, lower power, and faster timing-making it a direct functional upgrade for the 74LS151 without PCB changes.
What is the purpose of the complementary outputs Y and W on the 74ACT11251N?
The complementary outputs Y (true) and W (inverted) on the 74ACT11251N enable differential signaling, noise rejection, and logic redundancy. They are simultaneously driven from the same selected data input and share identical timing and enable control (G). This allows the 74ACT11251N to interface with differential receivers or provide fault-tolerant data paths without external inverters.
74ACT11251N 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:
- -
74ACT11251N FAQ
1.How can I place an order for 74ACT11251N through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11251N 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 74ACT11251N reliable?
The price and inventory of 74ACT11251N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11251N is usually 5 days.
3.What payment methods are accepted for 74ACT11251N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11251N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11251N?
74ACT11251N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11251N 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 74ACT11251N?
For technical support, including 74ACT11251N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11251N requirements.
6.How does Aetrix verify that 74ACT11251N is sourced from the original manufacturer or authorized distributors?
All 74ACT11251N 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 74ACT11251N meets industry standards.
7.What is the process for return or replacement of 74ACT11251N?
All 74ACT11251N units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11251N, 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 74ACT11251N part is unused and in its original packaging.
Return procedure for 74ACT11251N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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