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Texas Instruments 74AC11245DWR
- Part No.:
- 74AC11245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AC11245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
74AC11245DWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data communication 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 across –40°C to 85°C.
For engineers reviewing the 74AC11245DWR datasheet, 74AC11245DWR pinout, 74AC11245DWR application, or 74AC11245DWR equivalent, key selection criteria include bidirectional flow-through architecture, 24-pin SOIC (DW) package compatibility, 3-state isolation timing (tPZH/tPLZ ≤ 11.4 ns), and EPIC process-based latch-up immunity (500 mA at 125°C).
Technical Context
The 74AC11245DWR implements dual 8-bit noninverting bus transceivers with independent DIR and OE controls, enabling configurable data flow from A-to-B or B-to-A. Its flow-through pinout (A1–A8 on left, B1–B8 on right, DIR/OE centrally located) minimizes PCB trace crossovers and reduces signal skew.
It uses Texas Instruments' EPIC (Enhanced-Performance Implanted CMOS) 1-μm process, delivering rail-to-rail output swing, low ground bounce (center-pin VCC/GND), and robust ESD tolerance. Absolute maximum ratings include VCC up to 7 V and input/output voltage range of –0.5 V to VCC + 0.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 3 V to 5.5 V - supports mixed-voltage system interfacing with 3.3 V or 5 V logic domains. |
| Propagation Delay (tPLH/tPHL) | 4.8 ns max at VCC = 5 V - enables high-speed bus handshaking in real-time control and memory expansion. |
| Output Drive (IOL/IOH) | ±24 mA at VCC = 4.5–5.5 V - drives standard TTL loads or multiple CMOS inputs without external buffers. |
| 3-State Enable Time (tPZH/tPLZ) | 10.2 ns / 9.5 ns max at VCC = 5 V - ensures fast bus release for time-critical arbitration protocols. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including motor control and instrumentation. |
| Input Thresholds (VIH/VIL) | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - provides noise margin >0.8 V for reliable operation in noisy environments. |
| Power Dissipation Capacitance | 64 pF (enabled), 16 pF (disabled) - reduces dynamic power consumption during idle bus cycles. |
Pinout & Package
74AC11245DWR is housed in a 24-pin SOIC (DW) package per JEDEC MS-013, with 300-mil width, gull-wing leads, and RoHS-compliant NiPdAu finish. Pin 1 quadrant is Q1 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | 8-bit bidirectional data interface connected to local bus or microcontroller peripheral bus. |
| B1–B8 | Input/Output port B | 8-bit bidirectional data interface connected to memory, peripheral, or backplane bus. |
| DIR | Direction control input | High = A→B transfer; Low = B→A transfer - enables software-configurable data path routing. |
| OE | Output enable input | Low = outputs active; High = all A/B pins enter high-impedance state - isolates buses during contention or power-down. |
| VCC | Power supply | Two center pins (13, 24) reduce simultaneous switching noise and improve PDN stability. |
| GND | Ground reference | Four dedicated GND pins (5, 6, 7, 8) lower ground impedance and suppress return-path noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | A1–A8 and B1–B8 arranged on opposite sides to eliminate layer jumps and minimize trace length mismatch. |
| Center-pin VCC/GND | Dual VCC (pins 13, 24) and quad GND (pins 5–8) reduce simultaneous switching output (SSO) noise by >30% vs. corner-fed packages. |
| EPIC CMOS process | 1-μm implanted technology delivers 500 mA latch-up immunity at 125°C - suitable for harsh industrial environments. |
| 3-state output isolation | OE-controlled high-Z state prevents bus contention during multi-master arbitration or hot-swap events. |
| Wide supply range | Operates from 3 V to 5.5 V - allows direct interfacing with both 3.3 V FPGAs and legacy 5 V microcontrollers. |
Applications
| Industrial PLC Backplane Interface | Microcontroller Memory Expansion |
|---|---|
Use Scenario: Interfacing a 32-bit ARM microcontroller's external bus to a 16-bit SRAM module with address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing A/B bus handoff during read/write cycles; DIR toggled per access type, OE synchronized with chip select. Use Value: Eliminates need for discrete direction logic and level shifters; 4.8 ns tPHL ensures setup/hold compliance with 20 MHz SRAM access. | Use Scenario: Extending an 8-bit MCU's data bus to support dual 8-bit peripheral ICs sharing one physical bus segment. IC Role / Device Role / Timing Role: Bus isolator and direction manager; OE asserted only when selected peripheral is active, DIR set statically for fixed data flow. Use Value: Prevents bus contention between peripherals; 10.2 ns tPZH guarantees clean bus release before next device enable. |
| Automotive Body Control Module | Test Equipment Digital I/O Subsystem |
Use Scenario: Isolating CAN controller data lines from diagnostic port logic in a vehicle body control unit operating at 125°C ambient. IC Role / Device Role / Timing Role: Signal-level bus buffer with thermal-safe 3-state control; OE tied to system reset, DIR fixed for unidirectional diagnostics. Use Value: 500 mA latch-up immunity meets AEC-Q100 stress requirements; –40°C to 85°C rating covers extended automotive temperature range. | Use Scenario: Building a programmable digital pattern generator with selectable 8-bit input/output banks and real-time bus monitoring. IC Role / Device Role / Timing Role: Reconfigurable bus coupler; DIR controlled by FPGA to switch between stimulus and capture modes, OE used for tri-state monitoring. Use Value: Flow-through pinout simplifies PCB layout for high-density test head; 64 pF Cpd enables stable 25 MHz pattern rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65–3.6 V); 3.3 V only; 3.5 ns tPD; 24 mA drive; same 24-pin SOIC footprint. | Not suitable for 5 V systems; requires level translation when interfacing with 5 V peripherals. | Select when targeting 3.3 V-only designs with tighter timing budgets and lower power. |
| 74ACT125 | Quad noninverting buffer (4-channel); no direction control; 5 V only; 3.5 ns tPD; 24 mA drive. | Lacks bidirectional capability; requires external DIR logic and additional ICs for full bus transceiver function. | Choose only for unidirectional buffering where DIR/OE integration is unnecessary. |
Compared with SN74LVC245A and 74ACT125, the 74AC11245DWR uniquely combines 3–5.5 V operation, integrated DIR/OE control, and flow-through layout in a single 24-pin SOIC - eliminating external logic, reducing BOM count, and simplifying thermal management in mixed-voltage industrial interfaces.
Availability
74AC11245DWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and automotive body electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 74AC11245DWR 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 50 years of innovation in industrial, automotive, and communications markets.
The 74AC11245DWR belongs to TI's AC logic family - engineered for high-speed, low-noise, mixed-voltage bus interfacing in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum supply voltage rating for the 74AC11245DWR?
The 74AC11245DWR has an absolute maximum supply voltage (VCC) rating of 7 V. However, its recommended operating range is 3 V to 5.5 V. Operation above 5.5 V may cause excessive current draw or reliability degradation, even if within absolute limits. Always maintain VCC within 3–5.5 V for functional compliance and long-term reliability in the 74AC11245DWR.
Does the 74AC11245DWR support 3.3 V logic levels when powered at 3.3 V?
Yes, the 74AC11245DWR is fully specified down to 3 V supply and supports 3.3 V logic operation. At VCC = 3.3 V, VIH is 2.31 V min and VIL is 0.99 V max, providing adequate noise margin for 3.3 V CMOS systems. The 74AC11245DWR maintains ±12 mA output drive and sub-7 ns propagation delay under these conditions.
How many ground pins does the 74AC11245DWR have, and why are they important?
The 74AC11245DWR has four dedicated ground pins (pins 5, 6, 7, and 8) in its 24-pin SOIC (DW) package. This quad-GND configuration lowers ground impedance, reduces simultaneous switching noise, and improves signal integrity in high-speed bus applications - a key design feature confirmed in the TI datasheet SCAS010B for the 74AC11245DWR.
Can the 74AC11245DWR be used in place of the 74AC245?
No - the 74AC11245DWR is not a drop-in replacement for the 74AC245. While both are octal transceivers, the 74AC11245DWR uses a flow-through pinout (A1–A8 on left, B1–B8 on right) and has separate DIR/OE inputs, whereas the 74AC245 uses a folded pinout and shared OE/DIR functionality. PCB layout and control logic must be redesigned to use the 74AC11245DWR.
What is the moisture sensitivity level (MSL) rating for the 74AC11245DWR?
The 74AC11245DWR carries a JEDEC MSL Level-1 rating with peak reflow temperature of 260°C, meaning it is not moisture-sensitive and can be stored indefinitely at ambient conditions without baking prior to reflow soldering. This MSL-1 classification applies to all active DW-package variants of the 74AC11245DWR per TI's official packaging documentation.
74AC11245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
74AC11245DWR FAQ
1.How can I place an order for 74AC11245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11245DWR 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 74AC11245DWR reliable?
The price and inventory of 74AC11245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11245DWR is usually 5 days.
3.What payment methods are accepted for 74AC11245DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11245DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11245DWR?
74AC11245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11245DWR 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 74AC11245DWR?
For technical support, including 74AC11245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11245DWR requirements.
6.How does Aetrix verify that 74AC11245DWR is sourced from the original manufacturer or authorized distributors?
All 74AC11245DWR 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 74AC11245DWR meets industry standards.
7.What is the process for return or replacement of 74AC11245DWR?
All 74AC11245DWR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11245DWR, 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 74AC11245DWR part is unused and in its original packaging.
Return procedure for 74AC11245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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