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Texas Instruments 74ACT11245DWR
- Part No.:
- 74ACT11245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACT11245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,531
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Product details
Overview
74ACT11245DWR 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 TTL-voltage-compatible systems. It operates from –40°C to 85°C, supports 5 V supply (4.5–5.5 V), delivers ±24 mA output drive, and features flow-through pinout architecture for optimized PCB layout.
For engineers reviewing the 74ACT11245DWR datasheet, 74ACT11245DWR pinout, 74ACT11245DWR application, or 74ACT11245DWR equivalent, key selection criteria include direction-control (DIR) and output-enable (OE) logic behavior, 3-state isolation timing (tPZH/tPLZ ≤ 13.2 ns), TTL-input compatibility, and SOIC-24 package mechanical compatibility with legacy 74ACT/74F footprints.
Technical Context
The 74ACT11245DWR implements dual-directional bus communication using a single DIR input to select A→B or B→A data flow, while OE independently disables all outputs into high-impedance state. Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process ensures TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V) and rail-to-rail output swing (VOH ≥ 3.94 V at 4.5 V, VOL ≤ 0.44 V).
Switching performance is characterized by propagation delays tPLH/tPHL ≤ 10 ns (A↔B), and 3-state enable/disable times tPZH/tPLZ ≤ 13.9 ns. The device uses center-pin VCC and GND configuration in its SOIC-24 package to minimize high-speed switching noise, and exhibits 500-mA latch-up immunity at 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial 5 V rail tolerances. |
| Output Drive | ±24 mA - Sufficient to drive standard TTL loads and moderate-capacitance buses without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - Enables reliable operation in 50+ MHz bus systems with tight timing margins. |
| 3-State Enable Time | tPZH ≤ 12.9 ns - Supports fast bus arbitration and multi-master contention resolution. |
| Input Compatibility | TTL voltage levels (VIH = 2.0 V, VIL = 0.8 V) - Directly interfaces with legacy 74LS/74F logic without level shifters. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial ambient environments without derating. |
| Power Dissipation | 1.7 W (DW package, TA = 55°C) - Compatible with standard SOIC thermal pads and airflow-limited enclosures. |
Pinout & Package
74ACT11245DWR is housed in a 24-pin SOIC (DW) package per JEDEC MS-013, with 300-mil body width, 1.27 mm lead pitch, and center-aligned VCC (Pin 24) and GND (Pin 12) pins to reduce ground bounce and supply noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | Bi-directional data lines connected to source bus; driven when DIR/OE conditions permit. |
| B1–B8 | Input/Output port B | Bi-directional data lines connected to destination bus; driven when DIR/OE conditions permit. |
| DIR | Direction control | Low = B→A transfer; High = A→B transfer - determines data flow direction independent of OE. |
| OE | Output enable | Low = outputs active; High = all A/B pins enter high-impedance state - enables bus isolation. |
| VCC | Power supply | Pin 24 - center-placed to minimize supply inductance and improve decoupling effectiveness. |
| GND | Ground reference | Pin 12 - center-placed opposite VCC to form low-inductance power loop for high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins arranged on opposite sides (A on left, B on right) - reduces trace crossing and layer count in dense PCB layouts. |
| Center-pin VCC/GND | VCC (Pin 24) and GND (Pin 12) positioned centrally - lowers simultaneous switching noise (SSN) by shortening current return paths. |
| EPIC CMOS process | 1-μm implanted CMOS - delivers TTL-compatible inputs with CMOS power efficiency and 500-mA latch-up immunity. |
| 3-state output isolation | IOZ ≤ ±5 μA at VCC/GND - ensures negligible leakage during bus contention or hot-swap scenarios. |
| Wide temperature range | –40°C to +85°C operation - supports deployment in uncontrolled industrial cabinets and outdoor edge nodes. |
Applications
| Industrial PLC Backplane Interfacing | Legacy System Bus Extension |
|---|---|
Use Scenario: Isolating and extending parallel address/data buses between CPU modules and I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A→B (CPU-to-peripheral) and B→A (peripheral-to-CPU) transfers under DIR control, with OE enabling dynamic bus partitioning. Use Value: Eliminates need for discrete direction logic and buffering; flow-through pinout simplifies routing across 4-layer backplanes with <10 ns timing skew. |
Use Scenario: Connecting modern microcontroller-based subsystems to aging 8-bit ISA or VMEbus peripherals requiring TTL-level signaling. IC Role / Device Role / Timing Role: Level-shifting and protocol-transparent bus bridge that preserves original timing relationships while adding 3-state isolation. Use Value: Maintains full 24 mA drive capability at 5 V, ensuring signal integrity over 15 cm traces without added termination or repeaters. |
| Test Equipment Data Acquisition Interface | Automated Test Fixture Control |
Use Scenario: Multiplexing multiple DUT (device-under-test) parallel data ports onto a shared controller bus in ATE systems. IC Role / Device Role / Timing Role: High-speed bus isolator enabling concurrent test sequencing via DIR-driven directional switching and OE-gated channel selection. Use Value: Sub-10 ns propagation delay and <14 ns 3-state transition support synchronized sampling at >50 MSPS with deterministic latency. |
Use Scenario: Controlling relay matrices and sensor readback lines in production test fixtures where bus contention must be avoided during reconfiguration. IC Role / Device Role / Timing Role: Directionally configurable I/O expander with hardware-enforced isolation - OE asserts before DIR changes to prevent glitches. Use Value: Prevents transient shorts during fixture state transitions; ±50 mA clamp current protects against accidental probe shorts during debug. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT245SCX | Same ACT family, identical electrical specs and pinout; differs only in SOIC-20 package marking convention and tape/reel packaging. | No functional difference; SCX suffix denotes same DW package but different TI internal lot coding and reel orientation. | Select 74ACT245SCX only if legacy BOM specifies that exact marking - electrically and mechanically interchangeable with 74ACT11245DWR. |
| SN74LVC245APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA @ 3.3 V), LVTTL input thresholds (VIH = 2.0 V min), and TSSOP-20 package. | Requires level translation for 5 V systems; unsuitable for direct replacement where 5 V operation or SOIC-24 footprint is mandatory. | Choose SN74LVC245APWR only in new 3.3 V designs prioritizing lower power and smaller footprint - not a drop-in substitute for 74ACT11245DWR. |
Compared with 74ACT11245DWR, 74ACT245SCX offers identical functionality in the same SOIC-24 package with no design impact, whereas SN74LVC245APWR requires voltage domain redesign and board layout change due to different voltage range, pin count, and package size.
Availability
74ACT11245DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system bus extensions, and automated test fixture control requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for 74ACT11245DWR 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 74ACT11245DWR belongs to TI's advanced CMOS (ACT) logic product line, engineered for high-speed, low-noise bidirectional bus interfacing in industrial and instrumentation applications demanding TTL compatibility and robust ESD/latch-up performance.
FAQ
What is the maximum operating frequency supported by the 74ACT11245DWR?
The 74ACT11245DWR does not specify a maximum clock frequency, as it is an asynchronous transceiver. However, its typical propagation delay (tPLH/tPHL ≤ 10 ns) and 3-state transition times (tPZH/tPLZ ≤ 13.9 ns) support reliable operation in bus systems with effective data rates up to 50–60 MHz, assuming proper trace length, termination, and loading per application layout.
Can the 74ACT11245DWR operate at 3.3 V?
No - the 74ACT11245DWR is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, and its output drive strength, noise margins, and AC characteristics are guaranteed exclusively within the 5 V supply range. Operating below 4.5 V may result in undefined logic states or degraded timing.
Is the 74ACT11245DWR pin-compatible with the 74LS245?
Yes - the 74ACT11245DWR shares identical pinout, terminal functions, and SOIC-24 package dimensions with the 74LS245, enabling direct replacement. However, it delivers higher output drive (±24 mA vs. ±15 mA), faster timing (≤10 ns vs. ≤21 ns), and improved noise immunity due to its EPIC CMOS process and center-pin power/ground layout.
What is the meaning of "DWR" in the part number 74ACT11245DWR?
In the 74ACT11245DWR designation, "DW" indicates the SOIC-24 package type per TI's packaging nomenclature, and "R" denotes tape-and-reel packaging (2000 units per reel). The full orderable part number confirms RoHS-compliant green finish (CU NIPDAU), Level-1 moisture sensitivity, and industrial temperature qualification (–40°C to +85°C).
Does the 74ACT11245DWR require external pull-up or pull-down resistors on DIR or OE?
No - DIR and OE are CMOS inputs with leakage current ≤ ±1 μA (at 5.5 V), so they can be driven directly by TTL or CMOS logic outputs without external biasing. However, if left floating in system design, they must be externally pulled to a defined logic level (e.g., OE to VCC via 10 kΩ for default disable) to prevent metastability or unintended bus activation.
74ACT11245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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-SOIC
74ACT11245DWR FAQ
1.How can I place an order for 74ACT11245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245DWR 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 74ACT11245DWR reliable?
The price and inventory of 74ACT11245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245DWR is usually 5 days.
3.What payment methods are accepted for 74ACT11245DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245DWR?
74ACT11245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245DWR 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 74ACT11245DWR?
For technical support, including 74ACT11245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245DWR requirements.
6.How does Aetrix verify that 74ACT11245DWR is sourced from the original manufacturer or authorized distributors?
All 74ACT11245DWR 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 74ACT11245DWR meets industry standards.
7.What is the process for return or replacement of 74ACT11245DWR?
All 74ACT11245DWR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245DWR, 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 74ACT11245DWR part is unused and in its original packaging.
Return procedure for 74ACT11245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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