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Texas Instruments SN74ACT245PWR
- Part No.:
- SN74ACT245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT245PWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,546
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Product details
Overview
SN74ACT245PWR 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, delivers ≤8 ns propagation delay at 5 V, accepts inputs up to 5.5 V, and features TTL-compatible input thresholds-enabling robust interfacing in industrial control backplanes and mixed-voltage system interconnects.
For engineers reviewing the SN74ACT245PWR datasheet, SN74ACT245PWR pinout, SN74ACT245PWR application, or SN74ACT245PWR equivalent, key selection criteria include its 20-pin TSSOP package, direction-controlled bidirectional data flow, 3-state output isolation, and guaranteed 24-mA drive strength per output under 5-V operation.
Technical Context
The SN74ACT245PWR implements a dual-bus transceiver architecture with independent direction (DIR) and output-enable (OE) controls. Its positive-logic function table defines three operational states: A→B data transfer (DIR = H, OE = L), B→A transfer (DIR = L, OE = L), and high-impedance isolation (OE = H).
It uses ACT (Advanced CMOS Technology) logic with balanced output drive, slower edge rates to suppress ringing, and overvoltage-tolerant inputs-making it suitable for noise-sensitive bus environments where signal integrity and voltage-level bridging are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports stable operation across standard 5-V supply tolerances and brown-out margins. |
| Max Propagation Delay | 8 ns at 5 V - enables reliable timing in high-speed 5-V digital systems with ≤125-MHz bus clock equivalents. |
| Output Drive | ±24 mA per pin - sufficient to drive multiple TTL loads or moderate capacitive buses without external buffering. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe interfacing with 5-V signals even when VCC is at minimum 4.5 V. |
| Logic Compatibility | TTL-input thresholds (VIH = 2 V, VIL = 0.8 V) - ensures direct compatibility with legacy 5-V TTL and CMOS logic families. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded applications including factory automation and pro-audio equipment. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Determines data flow direction: HIGH enables A→B, LOW enables B→A. |
| 2–9 A1–A8 | Port A I/O terminals | Bidirectional data lines connected to one bus segment; high-impedance when OE = H. |
| 10 GND | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance. |
| 11–18 B8–B1 | Port B I/O terminals | Bidirectional data lines connected to second bus segment; pin order reversed per TI top-view convention. |
| 19 OE | Output enable input | Active-low control: LOW enables transceiver function; HIGH forces all A/B pins into 3-state high-Z. |
| 20 VCC | Power supply | Single 4.5–5.5 V supply for core logic and output drivers; requires local 0.1-µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous bidirectional data transfer | Eliminates need for external clock synchronization between bus domains, simplifying interface design. |
| Overvoltage-tolerant inputs | Accepts 5.5 V inputs regardless of VCC level-enables safe hot-swap and mixed-supply domain interfacing. |
| Controlled edge rates | Slower transitions minimize output ringing and EMI on long or unterminated traces in industrial backplanes. |
| High-impedance isolation | OE-driven 3-state outputs prevent bus contention during power-up, reset, or standby modes. |
| TTL-compatible input thresholds | Direct plug-in replacement for legacy 74LS/74ALS devices without level-shifting circuitry. |
Applications
| Industrial Backplane Interfacing | Pro-Audio Digital Signal Routing |
|---|---|
Use Scenario: Connecting microcontroller-based I/O modules to centralized PLC backplanes with shared 5-V data buses. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating controller-side logic from noisy field-side bus transients while preserving signal integrity. Use Value: Prevents bus contention during module insertion/removal and supports hot-plug capability via OE-controlled 3-state isolation. | Use Scenario: Routing AES3, I²S, or parallel digital audio data between DSP boards and FPGA-based mixer engines in stage-rack systems. IC Role / Device Role / Timing Role: Level-translating and fanout-capable transceiver enabling clean 5-V digital audio bus handoff between heterogeneous processing blocks. Use Value: TTL-compatible thresholds and controlled edge rates reduce jitter accumulation and bit errors in multi-board audio paths. |
| Factory Automation I/O Expansion | Video Signage Controller Interface |
Use Scenario: Extending GPIO and status bus lines from main controller to remote sensor/actuator carrier boards in modular machine tool cabinets. IC Role / Device Role / Timing Role: Direction-controlled data bridge allowing host reads of sensor registers and writes to actuator latches over shared 5-V parallel bus. Use Value: DIR-selectable flow eliminates need for separate transmit/receive buffers, reducing component count and PCB area. | Use Scenario: Interfacing FPGA video timing controllers to legacy 5-V LVDS transmitter or frame buffer ICs in large-format LED signage systems. IC Role / Device Role / Timing Role: Synchronized bus transceiver managing pixel data handoff between timing-critical display controller and memory subsystem. Use Value: 8 ns max tpd ensures setup/hold timing margins are maintained at 25–50 MHz pixel clock 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 |
|---|---|---|---|
| SN74LVC245APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), 3.3-V I/O tolerance - no 5-V input support. | Suitable for 3.3-V-only systems; cannot replace SN74ACT245PWR in 5-V bus environments. | Select only if entire system operates at 3.3 V and 5-V signal compatibility is unnecessary. |
| SN74HCT245PWR | Same 5-V operation, TTL-compatible inputs, but higher ICC (max 8 µA vs. 40 µA), slightly slower tpd (11 ns max). | Compatible pinout and voltage specs; preferred where lower static power or legacy HCT timing margins apply. | Drop-in alternative when reduced propagation delay is not required and lower quiescent current is prioritized. |
Compared with SN74LVC245APWR and SN74HCT245PWR, the SN74ACT245PWR uniquely combines 5-V operation, 5.5-V input tolerance, and 8-ns speed-making it the only choice for noise-resilient, high-speed 5-V bus bridging where overvoltage safety and timing margin are non-negotiable.
Availability
SN74ACT245PWR is available at Aetrix Electronics and suitable for industrial backplane interfacing, pro-audio digital routing, and factory automation I/O expansion requiring stable component supply and long-term production continuity.
Supply support for SN74ACT245PWR 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 for industrial, automotive, and communications markets.
The SN74ACT245PWR belongs to TI's Advanced CMOS Logic (ACT) family, engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial and professional audio systems.
FAQ
What is the maximum operating voltage for SN74ACT245PWR?
The SN74ACT245PWR has an absolute maximum VCC rating of 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this window may cause timing violations or increased ICC. The device also accepts input voltages up to 5.5 V regardless of VCC level-enabling safe interfacing with 5-V signals even at minimum supply.
Does SN74ACT245PWR support bidirectional data flow without external logic?
Yes. The SN74ACT245PWR natively supports bidirectional data transfer using only two control inputs: DIR sets direction (A→B or B→A), and OE enables/disables the transceiver. No external gates or clocks are needed-its function table defines all operational states deterministically, making it ideal for simple, low-latency bus bridging.
Can SN74ACT245PWR be used in 3.3-V systems?
No. The SN74ACT245PWR is specified only for 4.5–5.5 V operation and does not guarantee functionality below 4.5 V. For 3.3-V systems, TI recommends SN74LVC245APWR. Attempting to operate SN74ACT245PWR at 3.3 V risks undefined logic states, excessive propagation delay, and potential damage due to insufficient gate overdrive.
What is the thermal resistance (RθJA) of SN74ACT245PWR in its TSSOP package?
The SN74ACT245PWR in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 126.6 °C/W under standard JEDEC test conditions. This value assumes a 1-inch² 2-oz copper pad with two vias; actual board layout significantly impacts real-world thermal performance.
How should unused pins be handled on SN74ACT245PWR?
All unused I/O pins (A1–A8, B1–B8) on SN74ACT245PWR must be tied to VCC or GND-not left floating-to prevent undefined logic states and increased ICC. DIR and OE should be actively driven or pulled to valid logic levels (e.g., OE to VCC via pullup for default disable). Floating control inputs risk unintended bus activation or oscillation.
SN74ACT245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 20-TSSOP
SN74ACT245PWR FAQ
1.How can I place an order for SN74ACT245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245PWR 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 SN74ACT245PWR reliable?
The price and inventory of SN74ACT245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245PWR is usually 5 days.
3.What payment methods are accepted for SN74ACT245PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT245PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT245PWR?
SN74ACT245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245PWR 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 SN74ACT245PWR?
For technical support, including SN74ACT245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245PWR requirements.
6.How does Aetrix verify that SN74ACT245PWR is sourced from the original manufacturer or authorized distributors?
All SN74ACT245PWR 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 SN74ACT245PWR meets industry standards.
7.What is the process for return or replacement of SN74ACT245PWR?
All SN74ACT245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245PWR, 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 SN74ACT245PWR part is unused and in its original packaging.
Return procedure for SN74ACT245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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