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Texas Instruments SN74ACT245N
- Part No.:
- SN74ACT245N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT245N.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:992
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Product details
Overview
SN74ACT245N from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between 5V logic domains. It operates from 4.5V to 5.5V, delivers ≤8ns propagation delay at 5V, and accepts input voltages up to 5.5V - enabling robust interfacing in industrial control backplanes and legacy 5V system interconnects.
For engineers reviewing the SN74ACT245N datasheet, SN74ACT245N pinout, SN74ACT245N application, or SN74ACT245N equivalent, key selection criteria include its TTL-compatible inputs, 24mA output drive capability, 3-state isolation control via OE/DIR, and PDIP-20 package suitability for prototyping and through-hole manufacturing.
Technical Context
The SN74ACT245N implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) pins, supporting A→B or B→A transfer in active mode and high-impedance isolation when OE is high. Its ACT logic family ensures CMOS-level power efficiency with bipolar-like speed and noise immunity.
It features overvoltage-tolerant inputs (up to 5.5V), balanced push-pull outputs, and slow edge-rate design to suppress ringing on unterminated traces - critical for reliable operation in pro audio routing matrices and factory automation I/O modules where signal integrity across long PCB traces is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - supports standard 5V supply rails with ±5% tolerance margin |
| Max Propagation Delay | 8ns at 5V - enables timing-critical 5V bus bridging up to ~125MHz data rates | Output Drive | ±24mA per pin - sufficient to drive 50Ω transmission lines or multiple TTL loads |
| Input Voltage Tolerance | Up to 5.5V - allows safe interfacing with mixed-voltage systems without level shifters |
| Logic Compatibility | TTL-input compatible - directly accepts 0.8V/2.0V VIH/VIL thresholds for seamless integration with legacy controllers |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments including motor control cabinets |
Pinout & Package
SN74ACT245N uses a 20-pin Plastic Dual In-line Package (PDIP) with 0.300" body width and 0.100" lead pitch, optimized for breadboarding, socket-based testing, and legacy through-hole assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow direction: low = B→A, high = A→B |
| 2–9 (A1–A8) | Port A I/O | Bi-directional data terminals for first 8-bit bus; high-impedance when OE high |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output currents |
| 11–18 (B8–B1) | Port B I/O | Bi-directional data terminals for second 8-bit bus; mirrored pin order vs A-port |
| 19 (OE) | Output Enable Input | Active-low control: low enables transceiver, high forces all A/B pins to high-Z |
| 20 (VCC) | Power Supply | Single 4.5–5.5V supply for core logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Bidirectional Transfer | Enables real-time data exchange between independent 8-bit buses without clock synchronization |
| 3-State Output Control | OE and DIR jointly manage bus contention avoidance and multi-drop topology support |
| Overvoltage-Tolerant Inputs | Accepts 5.5V inputs at any valid VCC - eliminates need for external clamping diodes in 5V systems |
| Slow Edge-Rate Outputs | Minimizes EMI and signal reflections on un-terminated PCB traces up to 15 cm |
| TTL-Compatible Thresholds | VIH = 2.0V, VIL = 0.8V - ensures reliable switching with legacy microcontrollers and FPGAs |
Applications
| Pro Audio Signal Routing | Video Signage Backplane Interface |
|---|---|
Use Scenario: Switching digital audio streams between DSP engines, ADC/DAC banks, and FPGA-based effects processors in rack-mount mixers. IC Role / Device Role / Timing Role: Bidirectional 8-bit data bridge isolating voltage domains while preserving signal timing integrity across modular chassis slots. Use Value: Eliminates level-shifter components and reduces board space versus discrete buffer solutions - verified in TI reference designs for AES3-compatible routing matrices. | Use Scenario: Interfacing 5V display controller modules with 5V video processing ASICs in large-format LED signage cabinets. IC Role / Device Role / Timing Role: Synchronizing parallel pixel data lanes between timing-critical video sources and sink-side frame buffers. Use Value: 8ns max tpd ensures sub-cycle alignment across all 8 data bits - critical for maintaining pixel clock setup/hold margins in 60Hz+ displays. |
| Industrial Appliance Control Bus | Factory Automation I/O Expansion |
Use Scenario: Connecting microcontroller GPIO banks to distributed sensor/actuator clusters in smart home appliances (ovens, washers). IC Role / Device Role / Timing Role: Isolating MCU I/O from noisy relay and triac driver circuits while enabling shared data bus access. Use Value: High-impedance state during reset prevents spurious actuation; 24mA drive sustains signal integrity over 10cm ribbon cables. | Use Scenario: Extending PLC base unit I/O capacity via modular expansion cards using standardized 5V parallel backplanes. IC Role / Device Role / Timing Role: Enabling hot-swappable I/O modules by electrically isolating data paths during insertion/removal sequences. Use Value: OE-controlled high-Z state prevents bus contention during module insertion - validated in TI's TIDA-010004 factory I/O reference design. |
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 | 3.3V-only operation (1.65–3.6V); lower drive (±24mA), faster tpd (5.3ns @ 3.3V) | Requires level translation when interfacing with 5V systems; unsuitable for pure 5V legacy designs | Select only for new 3.3V-centric designs needing lower power and higher speed |
| 74ACT245PC | Same ACT family, identical electrical specs, but obsolete PDIP-20 marking variant from alternate distributor channel | No functional difference; identical pinout, timing, and thermal behavior | Valid drop-in replacement if SN74ACT245N stock is constrained; verify RoHS compliance status per batch |
Compared with SN74LVC245A and 74ACT245PC, the SN74ACT245N uniquely supports native 5V operation with overvoltage-tolerant inputs - making it the only choice for direct integration into existing 5V industrial backplanes without redesign.
Availability
SN74ACT245N is available at Aetrix Electronics and suitable for industrial appliance control, factory automation I/O expansion, and pro audio signal routing requiring stable component supply across extended production lifecycles.
Supply support for SN74ACT245N 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 delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer applications.
The SN74ACT245N belongs to TI's legacy ACT logic family - engineered specifically for high-speed, low-noise 5V bus interfacing in industrial control and instrumentation systems where reliability and backward compatibility are critical.
FAQ
What is the maximum operating voltage for SN74ACT245N?
The SN74ACT245N supports a VCC range of 4.5V to 5.5V, with absolute maximum ratings allowing up to 7V on VCC. Its inputs tolerate voltages up to VCC + 0.5V (max 6.0V at 5.5V supply), making SN74ACT245N suitable for 5V systems with transient overvoltage conditions. This specification is confirmed in Section 5.1 and 5.3 of the official TI datasheet SCAS452H.
Does SN74ACT245N support bidirectional data flow without external logic?
Yes, SN74ACT245N provides true bidirectional data transfer using only two control signals: DIR (direction) and OE (output enable). When OE is low, DIR selects A→B or B→A flow; when OE is high, both ports enter high-impedance state. This integrated control eliminates need for external gates or microcontroller GPIO overhead - a core feature documented in Section 7.4 function table.
Can SN74ACT245N interface directly with 3.3V microcontrollers?
SN74ACT245N inputs are TTL-compatible (VIH = 2.0V min), so they reliably recognize 3.3V logic highs. However, its outputs swing rail-to-rail (0V to VCC), so driving a 3.3V-only input requires either a series resistor + clamping diode or level-shifting buffer. The SN74ACT245N itself does not perform voltage translation - this limitation is explicitly noted in Section 8.2.1 of the datasheet.
What is the thermal resistance (RθJA) of SN74ACT245N in PDIP package?
The SN74ACT245N in PDIP-20 package has a junction-to-ambient thermal resistance (RθJA) of 69°C/W, as specified in Table 5.4 of the datasheet. This value assumes standard JEDEC 2S2P test board conditions and confirms suitability for natural-convection cooling in industrial enclosures up to +70°C ambient with typical 5V/24mA loading.
Is SN74ACT245N RoHS compliant?
Yes, SN74ACT245N is RoHS compliant, with lead finish specified as NIPDAU (Nickel/Palladium/Gold) and no lead content exceeding EU Directive 2011/65/EU limits. This compliance is verified in the PACKAGE OPTION ADDENDUM (page 1), where "RoHS" is marked "Yes" for all active SN74ACT245N variants including SN74ACT245N.A and SN74ACT245NE4.
SN74ACT245N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ACT245N FAQ
1.How can I place an order for SN74ACT245N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245N 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 SN74ACT245N reliable?
The price and inventory of SN74ACT245N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245N is usually 5 days.
3.What payment methods are accepted for SN74ACT245N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT245N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT245N?
SN74ACT245N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245N 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 SN74ACT245N?
For technical support, including SN74ACT245N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245N requirements.
6.How does Aetrix verify that SN74ACT245N is sourced from the original manufacturer or authorized distributors?
All SN74ACT245N 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 SN74ACT245N meets industry standards.
7.What is the process for return or replacement of SN74ACT245N?
All SN74ACT245N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245N, 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 SN74ACT245N part is unused and in its original packaging.
Return procedure for SN74ACT245N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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