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Texas Instruments SN74AC245PWR
- Part No.:
- SN74AC245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AC245PWR.pdf
- Description:
- IC TXRX NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:24,650
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Product details
Overview
SN74AC245PWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in mixed-voltage systems. It operates from 2 V to 6 V, accepts inputs up to 6 V, delivers ≤7 ns propagation delay at 5 V, and features direction control (DIR) and output enable (OE) for isolated bus management - used in industrial I/O expansion and legacy bus bridging.
For engineers reviewing the SN74AC245PWR datasheet, SN74AC245PWR pinout, SN74AC245PWR application, or SN74AC245PWR equivalent, key selection criteria include its wide VCC range (2–6 V), 3-state bidirectional capability, 20-pin TSSOP package, and compatibility with 3.3 V/5 V logic domains in factory automation and pro-audio signal routing.
Technical Context
The SN74AC245PWR implements CMOS-based bidirectional bus transceivers with independent DIR and OE controls, enabling deterministic A→B or B→A data flow without external clocking. Its logic-level agnostic inputs (tolerant to 6 V regardless of VCC) support level-shifting across 2.5 V, 3.3 V, and 5 V domains.
Functional modes are defined by DIR (determines data direction) and OE (enables/disables all outputs to high-impedance). The device exhibits balanced drive strength (±24 mA at 4.5 V), low power dissipation (40 µA ICC max), and controlled edge rates to suppress output ringing in noise-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports interoperability across 2.5 V, 3.3 V, and 5 V logic families without level shifters. |
| Max Propagation Delay | 7 ns at VCC = 5 V - enables reliable operation in high-speed parallel bus interfaces up to ~100 MHz effective throughput. |
| Input Voltage Tolerance | Up to 6 V regardless of VCC - allows safe interfacing with higher-voltage peripherals while powered from lower VCC rails. |
| Output Drive Strength | ±24 mA at VCC = 4.5 V - sufficient to drive standard TTL loads and moderate-capacitance PCB traces without buffering. |
| ESD Rating (HBM) | ±3000 V - meets industrial-grade robustness requirements for handling and board-level integration. |
| Operating Temperature | −40 °C to +85 °C - qualified for commercial and industrial ambient environments including factory control cabinets. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body size, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A data flow; HIGH enables A→B data flow. |
| 2–9 | A1–A8 | Port A bidirectional I/Os: connect to source bus; function as inputs or outputs depending on DIR state. |
| 10 | GND | Ground reference for all internal circuitry and I/O signaling. |
| 11–18 | B8–B1 | Port B bidirectional I/Os: connect to destination bus; mirror A-port behavior under DIR control. |
| 19 | OE | Active-low output enable: HIGH disables all outputs into high-impedance state for bus isolation. |
| 20 | VCC | Positive supply rail: powers internal logic and I/O buffers; requires local 0.1 µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2 V to 6 V operation enables single-device support for 2.5 V, 3.3 V, and 5 V system domains without external regulators. |
| Input Overvoltage Tolerance | Inputs accept up to 6 V irrespective of VCC - eliminates need for external clamping diodes when interfacing with higher-voltage peripherals. |
| Controlled Edge Rates | Slower transition times minimize output ringing and EMI in unterminated or long-trace bus configurations. |
| High-Impedance Isolation | OE-driven three-state outputs fully isolate A and B buses during power-up, power-down, or standby - prevents back-driving and contention. |
| Low Static Current | ICC ≤ 40 µA at VCC = 5.5 V - reduces quiescent power in always-on industrial control modules. |
Applications
| Industrial I/O Expansion | Legacy Bus Bridging |
|---|---|
|
Use Scenario: Adding isolated digital I/O channels to PLC base units or remote I/O modules using mixed-voltage backplanes. IC Role / Device Role / Timing Role: Bidirectional data translator between 3.3 V microcontroller bus and 5 V fieldbus peripherals (e.g., RS-485 transceivers, relay drivers). Use Value: Eliminates need for discrete level shifters and reduces component count while maintaining timing integrity via sub-7 ns tPLH/tPHL. |
Use Scenario: Interfacing modern ARM-based controllers with legacy ISA or parallel printer ports requiring 8-bit bidirectional handshake. IC Role / Device Role / Timing Role: Synchronous bus transceiver managing data direction and tristate control under CPU GPIO supervision. Use Value: Provides deterministic direction switching and bus isolation during interrupt-driven transfers, preventing data corruption during context switches. |
| Pro Audio Signal Routing | Factory Automation Data Hub |
|
Use Scenario: Configurable digital audio control bus in mixing consoles, where DSPs and FPGA I/O banks operate at different voltage levels. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional interface between 3.3 V FPGA configuration bus and 5 V analog switch control lines. Use Value: Enables glitch-free reconfiguration of audio signal paths during live operation due to fast, predictable 3-state transitions and no hold-time dependency. |
Use Scenario: Centralized sensor/actuator data aggregation node in modular machine control cabinets with distributed 24 V DC I/O. IC Role / Device Role / Timing Role: Isolated bus repeater linking multiple 8-bit sensor sub-buses to a master controller over extended PCB traces. Use Value: Maintains signal integrity across 10+ cm trace lengths via controlled slew rate and 24 mA drive, reducing need for termination resistors. |
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; faster tPD (5.3 ns @ 3.3 V); ±24 mA drive. | Restricted to 3.3 V systems; unsuitable for 5 V legacy interfaces or mixed-voltage translation. | Select when operating exclusively in 3.3 V domains and maximum speed is prioritized over voltage flexibility. |
| 74ACT245SCX | Same 4.5–5.5 V VCC range; higher drive (±24 mA); identical pinout; AC logic family (TTL-compatible inputs). | Requires 5 V supply only; lacks 2–6 V flexibility; TTL input thresholds limit use with 3.3 V microcontrollers without pull-ups. | Choose for pure 5 V industrial backplanes where TTL input compatibility is required and 3.3 V interfacing is unnecessary. |
Compared with SN74AC245PWR, SN74LVC245APWR offers higher speed but sacrifices voltage-range versatility, while 74ACT245SCX provides TTL input compatibility at the cost of 5 V-only operation - making SN74AC245PWR the optimal choice for mixed-voltage, future-proof industrial designs.
Availability
SN74AC245PWR is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy bus bridging, and pro audio signal routing requiring stable component supply across extended product lifecycles.
Supply support for SN74AC245PWR 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 SN74AC245PWR belongs to TI's AC-series advanced CMOS logic family, engineered for robust bidirectional bus interfacing in mixed-voltage industrial control and instrumentation systems.
FAQ
What is the supply voltage range supported by the SN74AC245PWR?
The SN74AC245PWR operates from 2 V to 6 V, enabling direct interfacing between 2.5 V, 3.3 V, and 5 V logic domains without external level-shifting circuitry. This wide range is confirmed in Section 5.3 of the official datasheet and applies specifically to the SN74AC245PWR variant in TSSOP-20 packaging.
Does the SN74AC245PWR support 5 V-tolerant inputs when powered from 3.3 V?
Yes - the SN74AC245PWR accepts input voltages up to 6 V regardless of VCC level, including when VCC = 3.3 V. This is explicitly specified in the "Features" and "Recommended Operating Conditions" sections of the datasheet and verified across all AC-family variants including SN74AC245PWR.
What is the maximum propagation delay of the SN74AC245PWR at 5 V?
The maximum propagation delay (tPLH/tPHL) of the SN74AC245PWR is 7 ns at VCC = 5 V and TA = 25 °C, as documented in Section 5.7 "Switching Characteristics, VCC = 5 V ± 0.5 V". This value is guaranteed across the full industrial temperature range (−40 °C to +85 °C) per datasheet limits.
How is bus direction controlled on the SN74AC245PWR?
Bus direction on the SN74AC245PWR is controlled by the DIR pin (Pin 1): logic HIGH enables data transmission from A bus to B bus; logic LOW enables transmission from B bus to A bus. This functional behavior is defined in Table 7-1 (Function Table) and applies identically to the SN74AC245PWR in TSSOP packaging.
Is the SN74AC245PWR pin-compatible with other package variants of the same part number?
Yes - the SN74AC245PWR shares identical pin configuration and electrical functionality with all other SN74AC245 variants (e.g., DB, DGS, NS, RKS), as confirmed in Figure 4-1 and the "Pin Functions" table. All 20-pin variants implement the same DIR/OE-controlled bidirectional transceiver logic with identical pin numbering and roles.
SN74AC245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AC245PWR FAQ
1.How can I place an order for SN74AC245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245PWR 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 SN74AC245PWR reliable?
The price and inventory of SN74AC245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245PWR is usually 5 days.
3.What payment methods are accepted for SN74AC245PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC245PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC245PWR?
SN74AC245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245PWR 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 SN74AC245PWR?
For technical support, including SN74AC245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245PWR requirements.
6.How does Aetrix verify that SN74AC245PWR is sourced from the original manufacturer or authorized distributors?
All SN74AC245PWR 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 SN74AC245PWR meets industry standards.
7.What is the process for return or replacement of SN74AC245PWR?
All SN74AC245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245PWR, 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 SN74AC245PWR part is unused and in its original packaging.
Return procedure for SN74AC245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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