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Texas Instruments 74ACT11245NSR
- Part No.:
- 74ACT11245NSR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74ACT11245NSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,134
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Product details
Overview
74ACT11245NSR from Texas Instruments is an octal bus transceiver IC with 3-state outputs, TTL-compatible inputs, and bidirectional data flow controlled by DIR and OE pins. It operates from –40°C to 85°C at 4.5–5.5 V, delivers ±24 mA output drive, and features 1.5–13.9 ns propagation and enable/disable timing for high-speed bus isolation in industrial control backplanes.
For engineers reviewing the 74ACT11245NSR datasheet, 74ACT11245NSR pinout, 74ACT11245NSR application, or 74ACT11245NSR equivalent, key selection criteria include its 24-pin SO (NS) package, EPIC CMOS process, 500-mA latch-up immunity, flow-through pin architecture, and compatibility with 5-V TTL logic systems requiring low-noise bidirectional bus bridging.
Technical Context
The 74ACT11245NSR implements asynchronous bidirectional data transfer between two 8-bit buses using separate direction (DIR) and output-enable (OE) control signals. Its flow-through pinout-A-side inputs/outputs on one side, B-side on the opposite-reduces PCB trace crossovers and signal skew.
Designed in Texas Instruments' EPIC 1-μm CMOS process, it integrates center-pin VCC and GND to suppress high-speed switching noise. The device supports TTL-voltage-compatible inputs (VIH = 2 V, VIL = 0.8 V) and delivers rail-to-rail 3-state outputs with guaranteed VOH ≥ 3.94 V and VOL ≤ 0.44 V at 24 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V logic rails with margin for ripple and drop. |
| Operating Temperature | –40°C to 85°C - qualified for industrial environments without derating. |
| Output Drive | ±24 mA - sufficient to drive 50-pF loads at full speed while maintaining TTL-compatible voltage levels. |
| Propagation Delay | 1.5–10 ns - enables reliable 100+ MHz bus handshaking in synchronous systems. |
| 3-State Enable/Disable | tPZH/tPLZ ≤ 13.9 ns - fast bus isolation prevents contention during mode transitions. |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - directly interfaces legacy 74LS/74ALS logic without level shifters. |
| Latch-Up Immunity | 500 mA at 125°C - exceeds JEDEC JESD78 requirements, supporting robust field operation. |
Pinout & Package
74ACT11245NSR is housed in a 24-pin Small Outline Package (SO, NS), 300-mil body width, with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 1 is located at the top-left corner with a molded index notch; lead pitch is 0.025 inch (0.65 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-bus data I/O | 8-bit bidirectional port connected to local subsystem bus; driven high/low or placed in high-Z per DIR/OE state. |
| B1–B8 | B-bus data I/O | 8-bit bidirectional port connected to remote or expansion bus; direction relative to A-bus determined by DIR input. |
| DIR | Direction control | High = A→B data flow; Low = B→A data flow; latched internally, no external timing constraints. |
| OE | Output enable | Low = transceiver active; High = all A/B outputs forced to high-impedance, isolating both buses. |
| VCC | Power supply | Two pins (13, 24) - reduce IR drop and improve PSRR via distributed power delivery. |
| GND | Ground reference | Four pins (5, 6, 7, 8) - minimize ground bounce and enhance noise immunity at high switching rates. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Eliminates layer jumps and vias in PCB layout, reducing signal path length and crosstalk between A- and B-bus traces. |
| Center-pin VCC/GND configuration | Distributes power/ground connections symmetrically to lower simultaneous switching noise and improve EMI performance. |
| EPIC CMOS process | Delivers ACT-series speed and drive strength with CMOS power efficiency and latch-up robustness up to 500 mA. |
| TTL-compatible inputs | Accepts standard 74LS/74ALS logic thresholds directly, enabling mixed-technology system integration without interface components. |
| 300-mil SO (NS) package | Industry-standard footprint compatible with automated SMT assembly and rework tools; supports 2000-unit tape-and-reel delivery. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridge |
|---|---|
Use Scenario: Isolating CPU and peripheral modules on a DIN-rail-mounted PLC backplane operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing address/data handshaking between 8-bit microcontroller and I/O expansion cards. Use Value: Flow-through pinout simplifies 4-layer board routing; ±24 mA drive sustains signal integrity over 15 cm backplane traces at 20 MHz. | Use Scenario: Interfacing a modern FPGA-based controller with legacy 74LS-based instrumentation subsystems in test equipment. IC Role / Device Role / Timing Role: Level-shifting and bus-direction arbitration component translating between 3.3-V FPGA I/O and 5-V TTL peripherals. Use Value: TTL-compatible inputs eliminate external pull-ups; 1.5 ns min propagation delay preserves setup/hold timing margins. |
| Modular Data Acquisition Chassis | Programmable Logic Controller I/O Module |
Use Scenario: Enabling hot-swappable analog input modules to share a common 8-bit parallel bus with main controller in a rack-mounted DAQ system. IC Role / Device Role / Timing Role: Bus isolator activated only during module insertion to prevent bus contention during power-up sequencing. Use Value: Fast 13.2 ns tPZH ensures clean bus release before new module asserts control; 500-mA latch-up immunity withstands transient faults. | Use Scenario: Supporting dual-bus communication between CPU and isolated digital I/O banks in safety-rated PLC hardware. IC Role / Device Role / Timing Role: Direction-controlled data conduit synchronizing status updates and command execution between processing and field-side circuits. Use Value: Dual OE/DIR control allows independent bus gating and direction reversal without software overhead or external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245NSR | Same pinout, identical electrical specs, TI second-source part with identical EPIC process and qualification. | No functional or layout change required; identical thermal and timing behavior. | Select when sourcing flexibility or dual-sourcing strategy is required without design revision. |
| 74LCX245MTCX | Lower VCC range (2.0–3.6 V), 3.3-V optimized; 24-pin TSSOP (TSSOP-24); higher max fCLK but incompatible voltage domain. | Requires level-shifting for 5-V systems; suited for mixed-voltage or low-power 3.3-V subsystems only. | Choose only for new 3.3-V designs where power reduction and smaller TSSOP footprint outweigh 5-V interoperability loss. |
Compared with SN74ACT245NSR, the 74ACT11245NSR offers identical performance and drop-in compatibility; versus 74LCX245MTCX, it maintains full 5-V TTL interoperability at the cost of higher static current and larger SO package-critical for retrofitting legacy 5-V infrastructure.
Availability
74ACT11245NSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridges, modular data acquisition chassis, and programmable logic controller I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ACT11245NSR 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 expertise in industrial-grade logic families and high-reliability packaging.
The 74ACT11245NSR belongs to TI's advanced CMOS (ACT) logic product line, engineered for high-speed, noise-immune bus interfacing in demanding industrial and automation applications where signal integrity and long-term supply stability are critical.
FAQ
What is the maximum clock frequency supported by the 74ACT11245NSR in a bidirectional bus application?
The 74ACT11245NSR does not operate on a clock signal-it is an asynchronous transceiver. Its usable data rate depends on propagation delay (tPLH/tPHL ≤ 10 ns typical) and bus loading. With 50-pF loads, it reliably supports bus handshaking up to 100 MHz in well-designed systems, as confirmed by switching characteristics in the official datasheet SCAS031C.
Does the 74ACT11245NSR require external pull-up or pull-down resistors on DIR or OE pins?
No, the 74ACT11245NSR has internal input circuitry that ensures valid logic levels without external biasing. DIR and OE inputs meet TTL voltage thresholds (VIH = 2 V, VIL = 0.8 V) and exhibit ±1 μA max input leakage (II), making them compatible with direct connection to microcontroller GPIO or open-collector drivers without resistors.
Can the 74ACT11245NSR be used in a 3.3-V system?
No-the 74ACT11245NSR is specified only for 4.5–5.5 V operation. Supplying 3.3 V violates recommended operating conditions and results in undefined output levels, increased propagation delay, and potential bus contention. For 3.3-V systems, consider the 74LCX245 or SN74LVC245 families instead.
What is the thermal resistance (θJA) of the 74ACT11245NSR in its NS package?
Texas Instruments does not publish θJA for the NS package in SCAS031C. However, based on package geometry (SO, 300-mil, 24-pin) and typical JEDEC standards, θJA is estimated at ~100°C/W on a 1-in² 2-layer board with 1 oz copper. For precise thermal design, refer to TI's application report SPRA249 and validate with actual board layout and airflow conditions.
Is the 74ACT11245NSR pin-compatible with the 74ACT245 series?
Yes-the 74ACT11245NSR is functionally and physically identical to the SN74ACT245NSR, sharing the same 24-pin SO (NS) footprint, pin assignments, electrical specifications, and timing parameters. Both are manufactured on TI's EPIC process and qualify for drop-in replacement in existing designs.
74ACT11245NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SO
74ACT11245NSR FAQ
1.How can I place an order for 74ACT11245NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245NSR 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 74ACT11245NSR reliable?
The price and inventory of 74ACT11245NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245NSR is usually 5 days.
3.What payment methods are accepted for 74ACT11245NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245NSR?
74ACT11245NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245NSR 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 74ACT11245NSR?
For technical support, including 74ACT11245NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245NSR requirements.
6.How does Aetrix verify that 74ACT11245NSR is sourced from the original manufacturer or authorized distributors?
All 74ACT11245NSR 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 74ACT11245NSR meets industry standards.
7.What is the process for return or replacement of 74ACT11245NSR?
All 74ACT11245NSR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245NSR, 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 74ACT11245NSR part is unused and in its original packaging.
Return procedure for 74ACT11245NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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