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Texas Instruments 74ACT11245NT
- Part No.:
- 74ACT11245NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
74ACT11245NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,702
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Product details
Overview
74ACT11245NT from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data bus communication between A and B buses. It features TTL-voltage-compatible inputs, flow-through architecture for optimized PCB layout, ±24 mA output drive at 5 V, and operates from –40°C to 85°C in a 24-pin plastic DIP package.
For engineers reviewing the 74ACT11245NT datasheet, 74ACT11245NT pinout, 74ACT11245NT application, or 74ACT11245NT equivalent, key selection criteria include bidirectional data flow control via DIR/OE pins, 3-state isolation capability, 5-V supply compatibility, and legacy DIP packaging for through-hole prototyping and industrial control backplanes.
Technical Context
The 74ACT11245NT implements dual-directional data routing using a single direction-control (DIR) input and an output-enable (OE) input, enabling either A→B or B→A transmission or full bus isolation. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process delivers high noise immunity and latch-up resistance (500 mA typical at 125°C).
It supports TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V) while operating from a 4.5–5.5 V supply, and exhibits propagation delays as low as 1.5 ns (tPLH/tPHL) with load-dependent timing up to 10 ns. The center-pin VCC/GND configuration minimizes high-speed switching noise in dense layouts.
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 systems and stable operation across industrial temperature range. |
| Output Drive | ±24 mA - sufficient to directly drive standard 50-Ω transmission lines or multiple TTL loads without external buffers. |
| Propagation Delay | 1.5 ns (min), 9.2 ns (max) - enables reliable operation in high-speed digital backplanes up to ~100 MHz clock-equivalent systems. |
| Input Compatibility | TTL-voltage compatible (VIH = 2.0 V, VIL = 0.8 V) - allows direct interfacing with legacy 74LS and 74F logic without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and test equipment. |
| 3-State Leakage | ±0.5 µA (max) - ensures minimal bus contention during isolation, critical for hot-swap and multi-master bus architectures. |
| Power Dissipation | 1.3 W (max at TA = 55°C) - defines thermal derating requirements for through-hole mounting on FR-4 PCBs with standard copper pour. |
Pinout & Package
74ACT11245NT uses a 24-pin plastic dual in-line package (PDIP, NT package), 300-mil width, with center-aligned VCC (pin 24) and GND (pins 5, 6, 7, 8) for low-noise power distribution.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | Eight bidirectional data lines connected to source bus; driven by internal transceivers when enabled and DIR-configured. |
| B1–B8 | Input/Output port B | Eight bidirectional data lines connected to destination bus; direction determined by DIR signal relative to A-port state. |
| DIR | Direction control | Active-High logic input: HIGH routes A→B, LOW routes B→A; determines data flow polarity for all eight channels. |
| OE | Output enable | Active-Low logic input: LOW enables transceiver outputs; HIGH places both A and B ports in high-impedance state for bus isolation. |
| VCC | Power supply | +5 V supply (pin 24); center-positioned to reduce simultaneous switching noise coupling into adjacent signal pins. |
| GND | Ground reference | Four dedicated ground pins (5, 6, 7, 8) provide low-inductance return paths for all I/O and internal logic switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input and output pins aligned across package (e.g., A1/B1 opposite) - simplifies layer routing and reduces trace crossovers on 2-layer PCBs. |
| Center-pin VCC/GND | VCC at pin 24 and GND at pins 5–8 - lowers power supply impedance and suppresses ground bounce in high-frequency bus switching. |
| EPIC CMOS process | 1-µm implanted CMOS technology - delivers 500 mA latch-up immunity at 125°C and robust ESD tolerance per MIL-STD-883. |
| TTL-compatible inputs | VIH = 2.0 V, VIL = 0.8 V - eliminates need for external level translators when interfacing with legacy 74LS, 74F, or microcontroller GPIOs. |
| 3-state output isolation | IOZ ≤ ±0.5 µA at VCC/GND - prevents bus contention during power sequencing, hot insertion, or multi-drop arbitration. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Connecting modular I/O cards to a central controller in programmable logic controllers (PLCs) with isolated 5-V backplanes. IC Role / Device Role / Timing Role: Bidirectional data bridge between CPU-side and peripheral-side address/data buses, controlled by system DIR and OE signals. Use Value: Enables deterministic bus arbitration and hot-swap-safe isolation without additional glue logic or voltage translation. | Use Scenario: Extending 8-bit ISA or STD bus segments in retro-computing or test instrumentation chassis. IC Role / Device Role / Timing Role: Octal transceiver managing data flow between master and slave slots, synchronized to system clock edges via DIR timing. Use Value: Maintains signal integrity over >15 cm traces while supporting TTL-level timing margins and board-level noise rejection. |
| Microcontroller Bus Expansion | Test Equipment Data Mux |
Use Scenario: Expanding GPIO count of an 8-bit MCU (e.g., 8051 or PIC18) to drive external memory or peripherals via multiplexed address/data bus. IC Role / Device Role / Timing Role: Transceiver translating between MCU's internal bus and external parallel interface, with OE tied to chip-select decoding. Use Value: Eliminates need for discrete MOSFET switches or complex CPLD logic, reducing BOM cost and layout area. | Use Scenario: Routing stimulus/response signals between multiple DUTs and a shared ATE controller in automated test fixtures. IC Role / Device Role / Timing Role: Directionally configurable bus switch enabling one-to-many or many-to-one signal path selection under software control. Use Value: Provides deterministic, low-latency signal routing with sub-10 ns propagation and guaranteed 3-state isolation between test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT245N | Same ACT family, identical pinout and AC/DC specs; differs only in part numbering convention (no "11" prefix) - functionally identical to 74ACT11245NT. | No functional difference; used interchangeably in legacy designs where marking or documentation references "245" nomenclature. | Select when sourcing consistency with older schematics or BOMs labeled 74ACT245. |
| SN74LVC245APWR | 3.3-V only operation (1.65–3.6 V), lower drive (±24 mA), smaller TSSOP-24 package; not 5-V tolerant on inputs without external resistors. | Suitable for modern low-voltage embedded systems but requires level-shifting for 5-V bus integration. | Choose only for new 3.3-V designs requiring lower power and smaller footprint; not drop-in for 5-V systems. |
Compared with 74ACT11245NT, 74ACT245N offers identical performance and pin compatibility in PDIP, while SN74LVC245APWR trades 5-V operation and through-hole mountability for reduced voltage and size - making the former a true replacement and the latter a voltage-domain migration option.
Availability
74ACT11245NT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, microcontroller bus expansion, and test equipment data mux applications requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT11245NT 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 decades of heritage in industry-standard logic families.
The 74ACT11245NT belongs to TI's advanced CMOS (ACT) logic product line, engineered for high-speed, low-noise, 5-V bus interfacing in industrial and computing infrastructure applications.
FAQ
What is the maximum operating temperature range for the 74ACT11245NT?
The 74ACT11245NT is characterized for operation from –40°C to +85°C. This industrial-grade temperature range is validated per TI's recommended operating conditions and supports deployment in factory automation, test equipment, and outdoor-rated enclosures without derating. Thermal performance remains stable across this range due to its EPIC CMOS process and center-pin power/ground layout.
Does the 74ACT11245NT support 3.3-V logic inputs?
No, the 74ACT11245NT does not support 3.3-V logic inputs natively. Its input thresholds are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max) and specified only for 4.5–5.5 V VCC operation. Applying 3.3-V signals risks marginal switching or increased static current; level translation is required for interoperability with 3.3-V systems. The 74ACT11245NT must be powered at 5 V to meet datasheet timing and drive specifications.
Can the 74ACT11245NT be used as a unidirectional buffer?
Yes, the 74ACT11245NT can operate as a unidirectional buffer by fixing the DIR pin to a constant logic level (HIGH for A→B, LOW for B→A) and controlling data flow solely via OE. In this mode, it provides 8-channel buffering with 3-state disable, matching the functionality of dedicated octal buffers like the 74ACT244 - though its bidirectional architecture adds flexibility for future design reuse.
What is the pin 1 marking convention for the 74ACT11245NT PDIP package?
The 74ACT11245NT in the NT (PDIP) package uses standard DIP orientation: pin 1 is located at the top-left corner when the notch or dot is oriented upward. The device marking "ACT11245" appears on the top surface near pin 1, consistent with TI's SOIC and PDIP labeling conventions documented in the 2015 Packaging Addendum.
Is the 74ACT11245NT RoHS compliant?
Yes, the 74ACT11245NT is RoHS compliant and Pb-Free (RoHS), as confirmed in TI's official packaging documentation. It uses CU NIPDAU lead finish and meets EU Directive 2011/65/EU requirements, with no exemption needed. The "NTE4" variant explicitly denotes the same RoHS compliance with enhanced environmental certification.
74ACT11245NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
74ACT11245NT FAQ
1.How can I place an order for 74ACT11245NT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245NT 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 74ACT11245NT reliable?
The price and inventory of 74ACT11245NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245NT is usually 5 days.
3.What payment methods are accepted for 74ACT11245NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245NT?
74ACT11245NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245NT 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 74ACT11245NT?
For technical support, including 74ACT11245NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245NT requirements.
6.How does Aetrix verify that 74ACT11245NT is sourced from the original manufacturer or authorized distributors?
All 74ACT11245NT 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 74ACT11245NT meets industry standards.
7.What is the process for return or replacement of 74ACT11245NT?
All 74ACT11245NT units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245NT, 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 74ACT11245NT part is unused and in its original packaging.
Return procedure for 74ACT11245NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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