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Texas Instruments SN74ACT245PWG4
- Part No.:
- SN74ACT245PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT245PWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
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Product details
Overview
SN74ACT245PWG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between 5-V logic domains. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs up to 5.5 V, delivers ≤8 ns propagation delay at 5 V, and features direction control (DIR) and output enable (OE) for flexible bus isolation-used in pro audio interconnects and factory automation I/O expansion.
For engineers reviewing the SN74ACT245PWG4 datasheet, SN74ACT245PWG4 pinout, SN74ACT245PWG4 application, or SN74ACT245PWG4 equivalent, this page provides verified package mapping (TSSOP-20), functional mode timing, 3-state drive capability, thermal resistance (RθJA = 126.6 °C/W), and real-world interface constraints including overvoltage-tolerant inputs and controlled edge rates to suppress ringing.
Technical Context
The SN74ACT245PWG4 implements dual 8-bit bidirectional data paths controlled by DIR and OE pins, enabling A→B or B→A data flow when OE is low and isolating both buses when OE is high. Its ACT logic family delivers CMOS-level power efficiency with TTL-voltage compatibility and 24-mA drive strength per output.
It uses a non-inverting transceiver architecture with symmetrical input/output voltage thresholds (VIH = 2 V, VIL = 0.8 V at VCC = 5 V), supports hot-swap-capable operation via OE pull-up recommendation, and exhibits slow edge rates to minimize signal integrity issues on lightly loaded traces-critical in video signage backplanes and appliance control panels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across industrial-grade 5-V rails with ±10% tolerance. |
| Max Propagation Delay | 8 ns at 5 V - enables reliable 125-MHz bus handshaking in synchronous peripheral interfaces. |
| Output Drive | ±24 mA per pin - sufficient to drive multiple TTL loads or short PCB traces without external buffering. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe interfacing with 5-V systems even when VCC is at minimum 4.5 V. |
| 3-State Leakage | ±5 µA max - guarantees robust bus isolation during power sequencing or standby modes. |
| ESD Rating | ±3000 V HBM - meets standard handling requirements for assembly in non-classified environments. |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial/industrial ambient conditions in embedded controllers. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body size, 1.2 mm max height, lead pitch 0.65 mm, gull-wing leads. RoHS-compliant, NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Determines data flow direction: low = B→A, high = A→B; must be stable before OE activation. |
| 2–9 A1–A8 | Port A I/O | Bidirectional data lines connected to one bus segment; high-impedance when OE = high. |
| 10 GND | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance connection to plane. |
| 11–18 B8–B1 | Port B I/O | Bidirectional data lines connected to second bus segment; pin order reversed for layout symmetry. |
| 19 OE | Output enable input | Active-low control: drives 3-state outputs when low; tie to VCC via pull-up for power-up isolation. |
| 20 VCC | Power supply | 5-V supply input; requires local 0.1-µF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous bidirectional data transfer | Enables real-time bus bridging without clock synchronization-ideal for legacy parallel interfaces in factory HMIs. |
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC level, simplifying mixed-voltage board design and eliminating level-shifters. |
| Controlled edge rate | Slower transitions reduce EMI and overshoot on long traces, critical for noise-sensitive pro audio digital buses. |
| 3-state output isolation | Guarantees <±5 µA leakage in high-Z mode, preventing contention during multi-master arbitration or power sequencing. |
| Thermal performance | RθJA = 126.6 °C/W in TSSOP-20 allows full 24-mA drive per pin at +85 °C ambient without derating. |
Applications
| Pro Audio Digital Interconnect | Video Signage Backplane |
|---|---|
Use Scenario: Connecting DSP modules to FPGA-based display controllers in stage lighting consoles. IC Role / Device Role / Timing Role: Bidirectional data bridge between 5-V audio processing bus and 5-V video timing bus with independent direction control. Use Value: Eliminates need for separate TX/RX buffers and reduces PCB layer count via single 20-pin transceiver. | Use Scenario: Isolating microcontroller GPIO from LED driver arrays in outdoor digital billboards. IC Role / Device Role / Timing Role: Level-shifting and bus contention protection for 8-bit parallel brightness control signals. Use Value: Prevents latch-up during hot-plug events and maintains signal integrity across 15-cm ribbon cable runs. |
| Appliance Control Panel Interface | Factory Automation I/O Expansion |
Use Scenario: Linking touch controller ASIC to main MCU in smart refrigerator UI subsystems. IC Role / Device Role / Timing Role: Direction-controlled data conduit for capacitive touch scan results and command feedback. Use Value: Enables shared bus architecture while meeting IEC 61000-4-2 ESD immunity requirements via integrated HBM rating. | Use Scenario: Extending PLC digital I/O capacity using modular terminal blocks with isolated 5-V logic. IC Role / Device Role / Timing Role: Bus repeater between CPU module and remote I/O slave cards in distributed control networks. Use Value: Supports deterministic 100-ns timing margins for safety-critical motion control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245PWR | Same die, active production status, identical TSSOP-20 package and electrical specs. | No functional difference; used interchangeably where lifecycle continuity is required. | Select SN74ACT245PWR for new designs requiring guaranteed long-term availability and TI's current production support. |
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), 32-mA drive, higher speed (tPD = 5.3 ns), but not 5-V tolerant. | Suitable only for 3.3-V systems; cannot replace SN74ACT245PWG4 in 5-V environments without level shifting. | Choose SN74LVC245APWR only when migrating to 3.3-V logic and redesigning power delivery and interface circuitry. |
Compared with SN74ACT245PWG4, SN74ACT245PWR offers identical functionality with assured supply chain continuity, while SN74LVC245APWR trades 5-V compatibility for lower voltage operation and faster switching-making it unsuitable as a drop-in replacement in existing 5-V designs.
Availability
SN74ACT245PWG4 is available at Aetrix Electronics and suitable for pro audio interconnects, video signage backplanes, and factory automation I/O expansion requiring stable component supply under extended temperature and ESD stress conditions.
Supply support for SN74ACT245PWG4 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 company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ACT245 product line delivers robust 5-V bus transceivers optimized for noise-sensitive, high-reliability applications where signal integrity, voltage tolerance, and thermal stability are critical.
FAQ
What is the maximum operating voltage for SN74ACT245PWG4?
The SN74ACT245PWG4 has an absolute maximum supply voltage (VCC) of 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this window may cause parametric shift or reliability degradation. Inputs tolerate up to 5.5 V regardless of VCC level, supporting mixed-voltage interface scenarios without damage.
Does SN74ACT245PWG4 support hot-swap operation?
Yes, SN74ACT245PWG4 supports controlled hot-swap behavior when OE is tied to VCC via a pull-up resistor. This ensures outputs remain in high-impedance state during power-up/down sequencing. The minimum pull-up value depends on the driver's sink capability, typically ≥10 kΩ for standard logic drivers-preventing bus contention during insertion.
What is the pin 1 orientation for SN74ACT245PWG4 in tape-and-reel packaging?
SN74ACT245PWG4 in TSSOP-20 (PW) packaging uses quadrant Q1 for pin 1 orientation in tape-and-reel format, as confirmed by TI's package materials documentation. The index area is located at the top-left corner of the pocket, with sprocket holes aligned to feed direction-enabling correct automated placement in SMT assembly.
Can SN74ACT245PWG4 drive multiple TTL loads directly?
Yes, SN74ACT245PWG4 can drive up to 10 standard TTL loads per output, based on its ±24-mA drive strength and TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V). This eliminates need for external buffers in typical industrial control backplanes where fan-out exceeds 5.
Is SN74ACT245PWG4 RoHS compliant?
Yes, SN74ACT245PWG4 is RoHS compliant with NIPDAU (nickel-palladium-gold) lead finish, as documented in TI's PACKAGE OPTION ADDENDUM. It meets EU Directive 2011/65/EU and carries no exemptions-verified through TI's material declaration reports and shipping documentation.
SN74ACT245PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT245PWG4 FAQ
1.How can I place an order for SN74ACT245PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245PWG4 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 SN74ACT245PWG4 reliable?
The price and inventory of SN74ACT245PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245PWG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT245PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT245PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT245PWG4?
SN74ACT245PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245PWG4 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 SN74ACT245PWG4?
For technical support, including SN74ACT245PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245PWG4 requirements.
6.How does Aetrix verify that SN74ACT245PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT245PWG4 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 SN74ACT245PWG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT245PWG4?
All SN74ACT245PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245PWG4, 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 SN74ACT245PWG4 part is unused and in its original packaging.
Return procedure for SN74ACT245PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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