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Texas Instruments 74AC11245NT
- Part No.:
- 74AC11245NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
74AC11245NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,569
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Product details
Overview
74AC11245NT from Texas Instruments is an octal bus transceiver IC with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and computing systems. It features direction control (DIR), output enable (OE), ±24 mA drive strength at 5 V, 4.8 ns typical propagation delay (tPLH/tPHL), and operates across –40°C to 85°C.
For engineers reviewing the 74AC11245NT datasheet, 74AC11245NT pinout, 74AC11245NT application, or 74AC11245NT equivalent, key selection considerations include bidirectional flow-through architecture, 24-pin PDIP package compatibility, 3-state bus isolation timing, and AC-series CMOS logic voltage thresholds (VIH/VIL) at 3–5.5 V supply.
Technical Context
The 74AC11245NT implements dual 8-bit noninverting transceivers controlled by a single DIR input to select data flow direction (A→B or B→A), and a shared OE input to place all outputs in high-impedance state. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process ensures latch-up immunity of 500 mA at 125°C.
Center-pin VCC and GND configuration minimizes high-speed switching noise, while flow-through pinout (A1–A8 on left, B1–B8 on right, DIR/OE centrally located) optimizes PCB layout routing. Logic-level compatibility spans 3 V to 5.5 V, with VIH = 3.15 V (min) and VIL = 1.35 V (max) at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal noninverting bidirectional bus transceiver with 3-state outputs |
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL compatibility |
| Drive Strength | ±24 mA at VCC = 4.5 V - sufficient to drive standard 50 Ω transmission lines or multiple TTL loads |
| Propagation Delay | 4.8 ns (tPLH/tPHL, VCC = 5 V) - enables reliable operation in sub-100 MHz synchronous bus environments |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V (VCC = 4.5 V) - ensures noise margin >0.7 V under worst-case conditions |
| Power Dissipation | 1.3 W (NT package, TA = 55°C) - defines thermal derating requirement for through-hole PCB mounting |
Pinout & Package
74AC11245NT uses a 24-pin plastic dual in-line package (PDIP, NT), 300-mil width, with center-power pinout: Pins 12 and 13 are VCC and GND respectively, minimizing ground bounce and supply noise during high-speed switching.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | Left-side 8-bit bus interface; driven when DIR = H and OE = L (A→B mode) |
| B1–B8 | Input/Output port B | Right-side 8-bit bus interface; driven when DIR = L and OE = L (B→A mode) |
| DIR | Direction control input | Active-High selects A→B data flow; Active-Low selects B→A data flow |
| OE | Output enable input | Active-Low enables transceiver; High-Z state isolates both buses when OE = H |
| VCC (Pin 12) | Positive supply | Center-placed 5 V supply pin reduces simultaneous switching noise coupling into adjacent signals |
| GND (Pin 13) | Ground reference | Center-placed ground pin provides low-inductance return path for all I/Os |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Minimizes trace length mismatch and skew between A/B ports, simplifying PCB routing in dense backplane or motherboard layouts |
| Center-pin VCC/GND | Reduces high-frequency supply impedance and ground bounce by placing power/ground centrally among 24 pins |
| EPIC CMOS process | Delivers 500 mA latch-up immunity at 125°C - critical for robustness in unregulated or thermally stressed industrial environments |
| 3-state output control | Enables true bus sharing without contention; OE-driven isolation prevents signal collisions during multi-master arbitration |
| Wide supply range (3–5.5 V) | Supports direct interface with 3.3 V microcontrollers and 5 V legacy peripherals without level-shifting circuitry |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Memory Expansion |
|---|---|
Use Scenario: Interfacing modular I/O cards to a central controller bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge between CPU-side and field-device-side buses, synchronized via external clock and controlled by FPGA-generated DIR/OE signals. Use Value: Flow-through pinout allows straight-layer PCB traces, reducing crosstalk and meeting EMC requirements for CE-marked industrial equipment. | Use Scenario: Adding RAM or ROM expansion slots to retro-computing platforms using 5 V TTL logic families. IC Role / Device Role / Timing Role: Isolates memory address/data buses during DMA cycles and enables hot-swap capability via OE-controlled bus release. Use Value: ±24 mA drive strength ensures clean signal integrity across 10+ inch ribbon-cable expansions without repeaters. |
| Test Equipment Signal Routing | Automated Manufacturing Fixture Control |
Use Scenario: Configurable signal path switching in automated test equipment (ATE) for DUT interface adaptation. IC Role / Device Role / Timing Role: Reconfigurable bus coupler allowing instrument-to-DUT or DUT-to-instrument data flow based on test sequence commands. Use Value: DIR-controlled directionality eliminates need for separate transmit/receive buffers, cutting BOM count and fixture complexity. | Use Scenario: Controlling parallel I/O lines between PLC and custom sensor/actuator modules on factory-floor fixtures. IC Role / Device Role / Timing Role: Level-translating and bus-isolating interface between 3.3 V controller outputs and 5 V solenoid drivers or opto-isolated inputs. Use Value: Wide 3–5.5 V supply range permits direct connection to either 3.3 V or 5 V rails, avoiding discrete level-shifters in space-constrained fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT125N | Quad noninverting buffer (4-channel), no direction control; fixed unidirectional flow | Suitable only for one-way bus buffering, not bidirectional communication | Select when direction control is unnecessary and channel count is lower |
| SN74LVC245APWR | 3.3 V optimized; supports 1.65–3.6 V supply; 24-pin TSSOP (PW) only - no PDIP option | Requires level-shifting for 5 V systems; incompatible with through-hole prototyping or legacy 5 V designs | Prefer for new low-voltage designs where RoHS-compliant surface-mount is acceptable |
Compared with 74AC11245NT, the 74ACT125N lacks bidirectionality and requires four devices to match channel count, while SN74LVC245APWR offers lower power and smaller footprint but sacrifices 5 V native operation and through-hole availability - making 74AC11245NT uniquely suited for industrial retrofits and mixed-voltage prototyping.
Availability
74AC11245NT is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy computer expansion interfaces, automated test equipment signal routing, and manufacturing fixture control requiring stable component supply and long-term obsolescence management.
Supply support for 74AC11245NT 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The 74AC11245NT belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-noise bidirectional bus interfacing in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum operating supply voltage for the 74AC11245NT?
The 74AC11245NT supports a supply voltage range of 3 V to 5.5 V, with absolute maximum rating of 7 V. Operation above 5.5 V violates recommended conditions and risks parametric degradation or reliability failure. At 5.5 V, VOH remains ≥4.94 V and VOL ≤0.44 V, ensuring TTL and CMOS logic compatibility in mixed-voltage systems.
Does the 74AC11245NT support 3.3 V logic levels?
Yes, the 74AC11245NT is fully specified down to 3 V supply and meets VIH = 2.1 V (min) and VIL = 0.9 V (max) at VCC = 3 V. Its AC-series CMOS inputs accept 3.3 V logic signals directly, and outputs swing rail-to-rail - enabling interoperability with 3.3 V microcontrollers without level shifters when VCC = 3.3 V.
What is the thermal performance of the 74AC11245NT in its NT package?
The 74AC11245NT in the 24-pin PDIP (NT) package has a maximum power dissipation of 1.3 W at TA = 55°C in still air. Its junction-to-ambient thermal resistance (θJA) is approximately 100°C/W, meaning a 1 W internal power dissipation raises junction temperature by ~100°C above ambient - requiring derating above 55°C or forced-air cooling in high-density layouts.
How does the DIR input control data flow direction in the 74AC11245NT?
In the 74AC11245NT, the DIR input determines bus direction: when DIR = Low, data flows from B bus to A bus; when DIR = High, data flows from A bus to B bus. This single-pin control eliminates external multiplexing logic and enables real-time reconfiguration - essential for dynamic bus arbitration in test equipment and modular I/O systems.
Is the 74AC11245NT pin-compatible with other 24-pin octal transceivers like the 74LS245?
No, the 74AC11245NT is not pin-compatible with 74LS245. While both are 24-pin octal transceivers, the 74AC11245NT uses center-pin VCC (Pin 12) and GND (Pin 13), whereas 74LS245 places VCC at Pin 24 and GND at Pin 12. Swapping them causes immediate power/ground misconnection - requiring PCB redesign or adapter board for migration.
74AC11245NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
74AC11245NT FAQ
1.How can I place an order for 74AC11245NT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11245NT 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 74AC11245NT reliable?
The price and inventory of 74AC11245NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11245NT is usually 5 days.
3.What payment methods are accepted for 74AC11245NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11245NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11245NT?
74AC11245NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11245NT 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 74AC11245NT?
For technical support, including 74AC11245NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11245NT requirements.
6.How does Aetrix verify that 74AC11245NT is sourced from the original manufacturer or authorized distributors?
All 74AC11245NT 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 74AC11245NT meets industry standards.
7.What is the process for return or replacement of 74AC11245NT?
All 74AC11245NT units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11245NT, 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 74AC11245NT part is unused and in its original packaging.
Return procedure for 74AC11245NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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