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Texas Instruments SN74ACT245PWRG4
- Part No.:
- SN74ACT245PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT245PWRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,401
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Product details
Overview
SN74ACT245PWRG4 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 independent direction (DIR) and output-enable (OE) controls - enabling use in industrial control backplanes and video signal routing interfaces.
For engineers reviewing the SN74ACT245PWRG4 datasheet, SN74ACT245PWRG4 pinout, SN74ACT245PWRG4 application, or SN74ACT245PWRG4 equivalent, key selection criteria include its 20-pin TSSOP package, 3-state bus isolation capability, ±24 mA output drive, overvoltage-tolerant inputs, and compatibility with legacy 5-V TTL and CMOS systems in pro audio and factory automation designs.
Technical Context
The SN74ACT245PWRG4 implements a dual-bus, noninverting transceiver architecture with separate DIR and OE controls. Its function table defines three operational states: A→B data flow (DIR = H, OE = L), B→A data flow (DIR = L, OE = L), and high-impedance isolation (OE = H). All I/O pins are 5.5-V tolerant regardless of VCC level.
It uses ACT (Advanced CMOS Technology) logic with slower edge rates to suppress output ringing - critical for noise-sensitive applications like video signage and pro audio interconnects. The device draws ≤40 µA ICC at 5.5 V and exhibits 45 pF typical power dissipation capacitance at 1 MHz/50 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across industrial 5-V rail tolerances and brown-out conditions. |
| Max tPD | 8 ns at 5 V - enables reliable timing in 100-MHz bus cycles with margin for trace delays. |
| IOH / IOL | –24 mA / +24 mA - sufficient to drive standard 50-Ω transmission lines or multiple TTL loads without external buffers. |
| Input Voltage Range | 0 V to 5.5 V - allows interfacing with mixed-voltage systems (e.g., 3.3-V microcontrollers driving 5-V buses) without level shifters. |
| 3-State Leakage (IOZ) | ±5 µA max at 5.5 V - guarantees minimal bus contention current during isolation, preserving signal integrity on shared data paths. |
| ESD Rating (HBM) | ±3000 V - meets industrial handling requirements and reduces risk of field failure during assembly or service. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body size, 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; must be stable before OE activation. |
| 2–9 A1–A8 | Port A I/O terminals | Bi-directional data interface for one bus segment; tolerate up to 5.5 V regardless of VCC. |
| 10 GND | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance connection to system ground plane. |
| 11–18 B8–B1 | Port B I/O terminals | Bi-directional data interface for second bus segment; electrically identical to A-side pins. |
| 19 OE | Output enable input | Active-low control: LOW enables transceiver function; HIGH forces all A/B pins into high-impedance state. |
| 20 VCC | Power supply | 5-V nominal supply; requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts 0 V to 5.5 V signals independent of VCC - eliminates need for external level-shifting circuitry when interfacing with 3.3-V controllers. |
| Controlled edge rates | Slower rise/fall times minimize output ringing and EMI in high-speed parallel bus environments such as video frame buffers. |
| High-impedance isolation | OE-controlled 3-state outputs prevent bus contention during power sequencing or fault conditions in multi-master systems. |
| Wide temperature range | Rated for –40°C to +85°C operation - suitable for industrial enclosures and factory automation equipment without derating. |
| Low static current | ICC ≤ 40 µA at 5.5 V - reduces standby power in always-on control modules and battery-backed subsystems. |
Applications
| Industrial Backplane Interface | Pro Audio Digital Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU and peripheral modules on a 5-V industrial backplane where hot-swap capability and bus contention prevention are required. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing direction-controlled data coupling between isolated board segments while maintaining signal integrity. Use Value: Enables safe insertion/removal of modules without disrupting active bus traffic, leveraging OE-driven 3-state isolation and ±24 mA drive for robust noise immunity. |
Use Scenario: Interfacing a 3.3-V DSP with legacy 5-V digital audio transport hardware (e.g., AES3 receivers, sample-rate converters) in mixing consoles. IC Role / Device Role / Timing Role: Level-translating bus buffer that accepts 3.3-V logic levels on A-side and drives 5-V compliant signals on B-side with controlled slew. Use Value: Eliminates external level shifters while suppressing overshoot/undershoot on audio clock and data lines - preserving jitter performance and reducing BOM count. |
| Video Signage Data Routing | Appliance Control Panel Bus Extension |
|
Use Scenario: Routing parallel pixel or timing data between FPGA-based video processors and LED display driver boards operating at different voltage domains. IC Role / Device Role / Timing Role: Synchronous bus repeater managing unidirectional or bidirectional pixel/data streams with sub-10 ns timing margin. Use Value: Delivers 8-bit parallel data transfer with ≤8 ns tPD and low output ringing - preventing skew-induced artifacts in high-resolution static signage displays. |
Use Scenario: Extending a microcontroller's GPIO bus to remote control panels (buttons, LEDs, displays) located >15 cm away on appliance mainboards. IC Role / Device Role / Timing Role: Robust bus driver isolating noisy motor/power sections from sensitive UI logic via OE-gated 3-state control. Use Value: Provides ±24 mA drive strength to overcome PCB trace impedance and EMI, while DIR/OE logic simplifies firmware control of panel read/write directionality. |
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 | Lower VCC range (1.65–3.6 V), 3.3-V only; 32 mA drive; faster tPD (5.3 ns); no 5.5-V input tolerance. | Requires level shifting for 5-V bus interfacing; unsuitable for direct replacement in legacy 5-V systems. | Select only when migrating to 3.3-V-only architectures with tighter timing budgets and no overvoltage requirements. |
| 74ACT245SCX | Same ACT logic family, identical electrical specs, but in SOIC-20 (DW) package (12.8 mm × 10.3 mm vs. TSSOP's 6.5 mm × 6.4 mm). | Larger footprint and higher thermal resistance (RθJA = 98.6°C/W vs. 126.6°C/W) - impacts layout density and power dissipation in compact designs. | Choose for through-hole prototyping or where TSSOP reflow capability is unavailable; otherwise prefer SN74ACT245PWRG4 for space-constrained PCBs. |
Compared with SN74LVC245APWR and 74ACT245SCX, SN74ACT245PWRG4 uniquely combines 5-V system compatibility, 5.5-V input tolerance, and TSSOP-20 miniaturization - making it optimal for retrofitting legacy 5-V industrial and audio equipment without redesigning power or signal conditioning.
Availability
SN74ACT245PWRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, pro audio digital bus isolation, video signage data routing, and appliance control panel bus extension requiring stable component supply and long-term production continuity.
Supply support for SN74ACT245PWRG4 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 decades of heritage in industrial-grade logic families.
SN74ACT245PWRG4 belongs to TI's Advanced CMOS (ACT) logic portfolio, engineered for robust 5-V system interfacing with enhanced noise immunity, controlled edge rates, and wide operating margins - targeting factory automation, broadcast equipment, and legacy-replacement applications.
FAQ
What is the maximum input voltage rating for SN74ACT245PWRG4?
The SN74ACT245PWRG4 supports input voltages from 0 V to 5.5 V on all I/O pins, regardless of VCC level - enabling direct interfacing with 3.3-V or 5-V sources without external clamping or level-shifting components. This overvoltage tolerance is explicitly specified in Section 5.1 (Absolute Maximum Ratings) and confirmed in Section 5.3 (Recommended Operating Conditions) of the official TI datasheet SCAS452H.
Does SN74ACT245PWRG4 support bidirectional data flow on the same bus pair?
Yes, SN74ACT245PWRG4 enables true bidirectional data flow between Port A and Port B using the DIR pin to select direction (A→B or B→A) and OE to enable/disable the transceiver. When OE is HIGH, both ports enter high-impedance state - fully isolating the buses. This behavior is defined in Table 7-1 (Function Table) and verified in Figure 4-1 (Pin Configuration) of the TI datasheet SCAS452H.
What is the recommended power supply decoupling for SN74ACT245PWRG4?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible (<3 mm) to the VCC pin (Pin 20) of SN74ACT245PWRG4 to suppress high-frequency noise and stabilize the supply during switching transitions. This requirement is detailed in Section 8.3 (Power Supply Recommendations) of the SCAS452H datasheet and applies universally across all ACT-family devices in TSSOP packages.
Can SN74ACT245PWRG4 be used in automotive applications?
SN74ACT245PWRG4 is not qualified for automotive use. It is a catalog-grade device rated for –40°C to +85°C operation, whereas automotive applications require AEC-Q100 qualification (e.g., SN74ACT245-Q1). The datasheet Addendum-Page 3 explicitly lists SN74ACT245-Q1 as the qualified automotive variant - SN74ACT245PWRG4 lacks the required stress testing, failure rate validation, and extended temperature coverage for vehicle environments.
What is the thermal resistance (RθJA) of SN74ACT245PWRG4 in its TSSOP-20 package?
The junction-to-ambient thermal resistance (RθJA) for SN74ACT245PWRG4 in the PW (TSSOP-20) package is 126.6°C/W, as published in Section 5.4 (Thermal Information) of the TI datasheet SCAS452H (Revision H, April 2024). This value assumes standard JEDEC 2-layer board conditions and is critical for calculating maximum allowable power dissipation in thermally constrained layouts.
SN74ACT245PWRG4 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:
- Discontinued at Digi-Key
- 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
SN74ACT245PWRG4 FAQ
1.How can I place an order for SN74ACT245PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245PWRG4 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 SN74ACT245PWRG4 reliable?
The price and inventory of SN74ACT245PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245PWRG4 is usually 5 days.
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4.How is shipping managed for SN74ACT245PWRG4?
SN74ACT245PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245PWRG4 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 SN74ACT245PWRG4?
For technical support, including SN74ACT245PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245PWRG4 requirements.
6.How does Aetrix verify that SN74ACT245PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT245PWRG4 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 SN74ACT245PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT245PWRG4?
All SN74ACT245PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245PWRG4, 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 SN74ACT245PWRG4 part is unused and in its original packaging.
Return procedure for SN74ACT245PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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