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Texas Instruments 74AC11245NSRE4
- Part No.:
- 74AC11245NSRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74AC11245NSRE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,066
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Product details
Overview
74AC11245NSRE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in TTL/CMOS systems. It features direction control (DIR), output enable (OE), ±24 mA drive capability at 5 V, 4.8 ns typical propagation delay (VCC = 5 V), and operates from –40°C to 85°C. It is used in backplane interfacing and system-level data bus isolation.
For engineers reviewing the 74AC11245NSRE4 datasheet, 74AC11245NSRE4 pinout, 74AC11245NSRE4 application, or 74AC11245NSRE4 equivalent, this page delivers verified functional role, real-world timing specs, package-confirmed pin mapping, and validated alternative options for industrial bus interface design.
Technical Context
The 74AC11245NSRE4 implements dual 8-bit noninverting transceivers with independent DIR and OE controls, enabling configurable unidirectional or bidirectional data flow. Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process ensures latch-up immunity of 500 mA at 125°C and supports operation across 3 V to 5.5 V supply rails.
It uses center-pin VCC and GND placement in its SO (NS) package to minimize high-speed switching noise, and its flow-through pinout-A1–A8 on left, B1–B8 on right, DIR/OE centrally located-optimizes PCB trace routing for parallel bus layouts without layer jumps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL compatibility. |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive standard 50 Ω transmission lines or 10+ TTL loads directly. |
| Propagation Delay | 4.8 ns (tPLH/tPHL, VCC = 5 V) - enables reliable operation in 100+ MHz bus cycles with margin. |
| 3-State Enable Time | 6.2 ns (tPZH, VCC = 5 V) - ensures fast bus release for time-critical arbitration protocols. |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - provides >0.8 V noise margin against ground bounce in noisy industrial environments. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial control and instrumentation applications. |
| Power Dissipation Cap | 1.3 W (NT package), 1.7 W (DW package) - defines thermal derating limits for sustained 8-bit bus activity. |
Pinout & Package
74AC11245NSRE4 is supplied in a 24-pin plastic small-outline (SO) package with NS drawing code, 300-mil width, and standard DIP-compatible footprint. The package features center-aligned VCC (pin 24) and GND (pins 1, 2, 3, 4) for low-noise power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | Bi-directional data terminals for first 8-bit bus; driven by internal transceiver when enabled and DIR set appropriately. |
| B1–B8 | Input/Output port B | Bi-directional data terminals for second 8-bit bus; mirrors A-port state under DIR control. |
| DIR | Direction control input | Low = B→A transfer; High = A→B transfer - determines data flow direction without clock or timing constraints. |
| OE | Output enable input | Low = outputs active; High = all A/B pins enter high-impedance state - isolates both buses simultaneously. |
| VCC | Positive supply | Pin 24 only - single-supply rail; decoupling required within 1 cm for stable 5 V switching. |
| GND | Ground reference | Pins 1, 2, 3, 4 - quad ground pins reduce return-path inductance and suppress simultaneous switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Left-to-right A1–A8 → DIR/OE → B1–B8 layout eliminates crossing traces and reduces signal skew in parallel bus routing. |
| Center-pin VCC/GND | Dual VCC (pin 24) and four GND pins (1–4) placed centrally lower power distribution impedance and suppress ground bounce during 8-bit switching. |
| EPIC CMOS process | 1-μm implanted CMOS delivers 500 mA latch-up immunity at 125°C - critical for reliability in thermally stressed industrial enclosures. |
| 3-state output isolation | Simultaneous high-Z on all 16 I/Os via single OE pin enables clean bus arbitration and hot-swap-safe subsystem partitioning. |
| Wide voltage operation | Functional across 3 V to 5.5 V allows direct interface with both modern low-voltage logic and legacy 5 V systems without level shifters. |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Connecting multiple MCU modules to a shared 8-bit data/address bus in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus buffer that isolates inactive modules and prevents contention during multi-master arbitration. Use Value: Enables deterministic bus access using DIR/OE handshaking with no added clock latency or glue logic. |
Use Scenario: Extending GPIO or parallel interface capability of an ARM Cortex-M4 microcontroller to external peripherals like LCDs or ADCs. IC Role / Device Role / Timing Role: Level-translating transceiver supporting 3.3 V MCU core and 5 V peripheral voltage domains. Use Value: Eliminates need for discrete level shifters while maintaining <5 ns propagation delay for real-time peripheral response. |
| Legacy System Emulation | Test Equipment Data Path |
|
Use Scenario: Replacing obsolete 74LS245 in vintage computer repair or retro-computing hardware upgrades. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement with AC-series speed and CMOS input thresholds. Use Value: Restores full 5 V TTL functionality with 4× faster propagation and 10× lower static current versus original LS parts. |
Use Scenario: Routing stimulus/response signals between FPGA pattern generator and DUT in automated test equipment (ATE). IC Role / Device Role / Timing Role: Controlled-direction bus switch enabling synchronized capture and drive modes on shared test bus. Use Value: Allows single 16-pin bus to serve dual roles (stimulus output and response input) with sub-10 ns direction switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AC245DWRE4 | Same AC-family performance, identical pinout, but lacks DIR pin - requires external logic for direction control. | Suitable only where direction is fixed or managed externally; not usable for dynamic bidirectional protocols. | Select only if system uses dedicated direction lines or FPGA-controlled unidirectional paths. |
| SN74LVC245APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), smaller TSSOP-24 package, higher speed (2.8 ns tPD). | Requires level-shifting for 5 V systems; optimized for battery-powered or space-constrained digital logic, not industrial 5 V backplanes. | Prefer for new low-voltage designs; avoid when interfacing legacy 5 V peripherals or needing wide-VCC tolerance. |
Compared with 74AC11245NSRE4, the 74AC245DWRE4 removes bidirectional flexibility but simplifies control in fixed-path systems, while SN74LVC245APWR trades 5 V compatibility for compact size and lower power - making 74AC11245NSRE4 the sole choice for robust, mixed-voltage, dynamically switched industrial bus interfaces.
Availability
74AC11245NSRE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system repair requiring stable component supply, long-term lifecycle support, and RoHS-compliant 5 V logic interfacing.
Supply support for 74AC11245NSRE4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74AC11245NSRE4 belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, and latch-up-immune operation in demanding industrial control and instrumentation systems.
FAQ
What is the operating voltage range for the 74AC11245NSRE4?
The 74AC11245NSRE4 operates over a supply voltage range of 3 V to 5.5 V. This allows interoperability with both 3.3 V and 5 V logic families without level translation. At 3 V, it delivers 12 mA low-level drive; at 5.5 V, it maintains ±24 mA output capability while staying within absolute maximum ratings. The device is fully characterized across this range per TI's SCAS010B datasheet.
Does the 74AC11245NSRE4 support true bidirectional data flow without external logic?
Yes, the 74AC11245NSRE4 supports true bidirectional data flow using its dedicated DIR (direction control) input. When DIR = Low, data passes from B bus to A bus; when DIR = High, data flows from A bus to B bus. This eliminates the need for external multiplexers or control-state machines, enabling simple, deterministic bus arbitration in systems like PLC backplanes or modular instrumentation.
What package type is used for the 74AC11245NSRE4, and is it compatible with standard SOIC footprints?
The 74AC11245NSRE4 uses a 24-pin plastic small-outline (SO) package with NS drawing code - a 300-mil width variant compatible with industry-standard SOIC-24 footprints. Its pin pitch is 1.27 mm, body width is 7.5 mm, and it shares mechanical dimensions with NT (DIP) and DW (SOIC) variants, allowing board-level substitution where thermal and routing constraints permit.
How does the 74AC11245NSRE4 handle bus isolation when disabled?
When the OE (output enable) input is driven High, all 16 I/O pins (A1–A8 and B1–B8) enter a high-impedance (3-state) condition, effectively isolating both buses. This isolation is simultaneous and complete - no leakage path remains between A and B sides. The device specifies IOZ ≤ ±5 μA at VCC = 5.5 V, ensuring negligible crosstalk during bus arbitration or hot-swap events.
Is the 74AC11245NSRE4 RoHS compliant and lead-free?
Yes, the 74AC11245NSRE4 is RoHS compliant and lead-free. Per TI's packaging documentation, the "E4" suffix denotes Pb-Free (RoHS) finish with CU NIPDAU termination. It meets EU Directive 2011/65/EU requirements and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. MSL rating is not applicable for this through-hole-compatible SO package.
74AC11245NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SO
74AC11245NSRE4 FAQ
1.How can I place an order for 74AC11245NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11245NSRE4 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 74AC11245NSRE4 reliable?
The price and inventory of 74AC11245NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11245NSRE4 is usually 5 days.
3.What payment methods are accepted for 74AC11245NSRE4?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11245NSRE4?
74AC11245NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11245NSRE4 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 74AC11245NSRE4?
For technical support, including 74AC11245NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11245NSRE4 requirements.
6.How does Aetrix verify that 74AC11245NSRE4 is sourced from the original manufacturer or authorized distributors?
All 74AC11245NSRE4 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 74AC11245NSRE4 meets industry standards.
7.What is the process for return or replacement of 74AC11245NSRE4?
All 74AC11245NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11245NSRE4, 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 74AC11245NSRE4 part is unused and in its original packaging.
Return procedure for 74AC11245NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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