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Texas Instruments SN74AC245DW
- Part No.:
- SN74AC245DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC245DW.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
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Product details
Overview
SN74AC245DW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and consumer systems. It operates from 2 V to 6 V, supports 5-V and 3.3-V logic levels, delivers ≤7 ns propagation delay at 5 V, and features independent direction (DIR) and output-enable (OE) controls for flexible bus isolation-used in factory automation I/O expansion and pro-audio digital signal routing.
For engineers reviewing the SN74AC245DW datasheet, SN74AC245DW pinout, SN74AC245DW application, or SN74AC245DW equivalent, this page provides verified functional modes, SOIC-20 package dimensions, switching characteristics at 3.3 V and 5 V, thermal resistance (98.6 °C/W), and validated alternatives for bus interface redesigns requiring voltage-level flexibility and low-output ringing.
Technical Context
The SN74AC245DW implements a CMOS-based octal transceiver architecture with dual-bus bidirectional control via DIR input and full 3-state output disable via OE. Its balanced drive strength and intentionally slower edge rates minimize output ringing on unterminated or lightly loaded PCB traces.
It supports mixed-voltage operation: inputs tolerate up to 6 V regardless of VCC, enabling safe interfacing between 3.3-V microcontrollers and 5-V peripheral buses. Functional modes are strictly defined by OE/DIR logic combinations-no internal latching or clocking is involved, making it suitable for purely combinatorial bus arbitration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables interoperability across 3.3-V and 5-V system domains without level shifters. |
| Max tPD @ 5 V | 7 ns - ensures sub-140-MHz data throughput in synchronous bus applications with tight timing margins. |
| IOL / IOH | ±24 mA @ 4.5 V - sufficient to drive multiple TTL loads or short PCB traces without external buffers. |
| Input Voltage Tolerance | Up to 6 V - allows direct connection to 5-V signals even when powered from 3.3 V, eliminating clamping diodes. |
| RθJA | 98.6 °C/W (SOIC-20) - defines thermal derating limit: max 320 mW continuous power dissipation at 85°C ambient. |
| ESD Rating | ±3000 V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
SN74AC245DW uses a 20-pin SOIC (DW) package measuring 12.8 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), RoHS-compliant with NiPdAu lead finish and MSL Level-1 reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A data flow; HIGH enables A→B flow. |
| 2–9 | A1–A8 | Octal bidirectional I/O port A - connects to microcontroller or processor data bus. |
| 10 | GND | Ground reference for all logic and power domains. |
| 11–18 | B8–B1 | Octal bidirectional I/O port B - connects to peripheral, memory, or external bus segment. |
| 19 | OE | Active-low output enable: HIGH forces all A/B pins into high-impedance state for bus isolation. |
| 20 | VCC | Positive supply input - must be bypassed with ≥0.1 µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Supports single-supply operation across legacy 5-V and modern 3.3-V systems without voltage translation. |
| 6-V-tolerant inputs | Eliminates need for external level-shifting components when interfacing higher-voltage peripherals. |
| ≤7 ns tPD at 5 V | Enables reliable operation in 70+ MHz bus cycles with margin for trace delays and setup/hold times. |
| Slow-edge-rate design | Reduces EMI and signal integrity issues on uncontrolled-impedance PCB traces and connectors. |
| True 3-state outputs | Provides complete electrical isolation between A and B buses when OE is asserted, preventing contention. |
Applications
| Industrial PLC I/O Expansion | Pro Audio Digital Bus Interface |
|---|---|
|
Use Scenario: Isolating and translating data between a 3.3-V ARM-based controller and legacy 5-V discrete I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing parallel status/control word transfers with direction controlled per cycle. Use Value: Eliminates external level shifters while maintaining <7 ns latency and robust noise immunity in electrically noisy factory environments. |
Use Scenario: Routing AES/EBU or I²S audio data streams between 5-V DACs and 3.3-V FPGA-based digital mixers in stage-grade audio processors. IC Role / Device Role / Timing Role: Synchronous data bridge with precise DIR/OE timing coordination to avoid sample misalignment during format conversion. Use Value: Prevents output ringing-induced jitter on high-speed audio clocks and maintains signal integrity over 10+ cm PCB traces. |
| Smart Appliance Control Hub | Video Signage Backplane Interface |
|
Use Scenario: Interfacing a 3.3-V MCU to multiple 5-V display drivers, motor controllers, and sensor hubs in connected home appliances. IC Role / Device Role / Timing Role: Octal transceiver enabling shared bus access with dynamic direction switching for command/response protocols. Use Value: Reduces BOM count by consolidating eight signal paths into one SOIC-20 device with integrated 3-state control. |
Use Scenario: Driving LVDS or TTL video timing signals across modular signage backplanes where source (5-V) and sink (3.3-V) operate at different voltages. IC Role / Device Role / Timing Role: Direction-controlled data repeater synchronizing pixel clock, HSYNC, VSYNC, and RGB data lanes. Use Value: Maintains signal fidelity across multi-board interconnects without skew-inducing external buffers or resistive termination. |
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; 5-V tolerant inputs but not 6-V. | Suitable for pure 3.3-V systems; cannot replace SN74AC245DW in 5-V or mixed 2–6-V designs. | Select when operating exclusively at 3.3 V and lower static power (ICC = 10 µA) is critical. |
| 74ACT245 | Same 2–6 V range and pinout; slightly higher drive (±24 mA @ 5 V) but no 6-V input tolerance guarantee. | Compatible in 5-V-only systems; lacks documented 6-V input safety margin for mixed-voltage use cases. | Choose only if legacy 74ACT family compatibility is required and 6-V input tolerance is not needed. |
Compared with SN74LVC245A and 74ACT245, the SN74AC245DW uniquely combines 6-V input tolerance, 2–6-V supply flexibility, and SOIC-20 packaging-making it the only option among the three qualified for direct 5-V-to-3.3-V bidirectional bridging without external components.
Availability
SN74AC245DW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, pro audio digital bus interface, and smart appliance control hub applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74AC245DW 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 SN74AC245DW belongs to TI's AC-series advanced CMOS logic family, engineered for robust mixed-voltage bus interfacing in noise-sensitive and thermally constrained environments.
FAQ
What is the maximum operating temperature for the SN74AC245DW?
The SN74AC245DW has a specified operating free-air temperature range of –40°C to +85°C. This rating applies to all active orderable variants including SN74AC245DWRE4. Thermal derating begins above 85°C ambient, and junction temperature must remain below 150°C under steady-state conditions per absolute maximum ratings.
Does the SN74AC245DW support 3.3-V operation with 5-V inputs?
Yes, the SN74AC245DW supports 3.3-V VCC operation while accepting input voltages up to 6 V on all A, B, DIR, and OE pins. This allows direct connection of 5-V signals to a 3.3-V-powered SN74AC245DW without external clamping or level-shifting circuitry.
What is the function of the DIR and OE pins on the SN74AC245DW?
DIR (pin 1) controls data direction: logic HIGH enables A→B transfer; logic LOW enables B→A transfer. OE (pin 19) is active-low output enable: logic HIGH places all A and B pins in high-impedance state, isolating both buses. Both pins are CMOS-compatible and require proper biasing to avoid floating states.
Is the SN74AC245DW pin-compatible with other 20-pin octal transceivers?
The SN74AC245DW shares identical pinout and function mapping with industry-standard 74AC245 devices including SN74LVC245A and 74ACT245 in SOIC-20 (DW) packages. However, voltage ratings and timing differ-direct substitution requires verification of VCC range, input tolerance, and propagation delay requirements.
What is the recommended bypass capacitor for the SN74AC245DW VCC pin?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (pin 20) and GND (pin 10). For systems with multiple power domains or high-frequency noise, paralleling with a 1 µF capacitor improves broadband decoupling effectiveness without compromising stability.
SN74AC245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AC245DW FAQ
1.How can I place an order for SN74AC245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245DW 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 SN74AC245DW reliable?
The price and inventory of SN74AC245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245DW is usually 5 days.
3.What payment methods are accepted for SN74AC245DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC245DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC245DW?
SN74AC245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245DW 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 SN74AC245DW?
For technical support, including SN74AC245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245DW requirements.
6.How does Aetrix verify that SN74AC245DW is sourced from the original manufacturer or authorized distributors?
All SN74AC245DW 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 SN74AC245DW meets industry standards.
7.What is the process for return or replacement of SN74AC245DW?
All SN74AC245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245DW, 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 SN74AC245DW part is unused and in its original packaging.
Return procedure for SN74AC245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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