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Texas Instruments SN74AC245IDWREP
- Part No.:
- SN74AC245IDWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC245IDWREP.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,121
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Product details
Overview
SN74AC245IDWREP from Texas Instruments is an octal bus transceiver IC designed for asynchronous two-way data communication between parallel buses in industrial and embedded systems. It operates from 2 V to 6 V, supports bidirectional data flow controlled by DIR and OE pins, delivers ≤7 ns propagation delay at 5 V, and features ±24 mA output drive capability with high-impedance isolation when disabled.
For engineers reviewing the SN74AC245IDWREP datasheet, SN74AC245IDWREP pinout, SN74AC245IDWREP application, or SN74AC245IDWREP equivalent, this page provides verified functional behavior, SOIC-20 package layout, voltage-tolerant inputs up to 6 V, guaranteed timing across −40°C to 85°C, and direct alternatives for bus interface redesigns requiring enhanced reliability and extended temperature support.
Technical Context
The SN74AC245IDWREP implements TTL-compatible AC logic with dual-rail input tolerance - inputs accept voltages up to 6 V independent of VCC, enabling mixed-voltage bus interfacing. Its direction control (DIR) and output-enable (OE) signals operate asynchronously, eliminating need for clock synchronization during bus handshaking.
Internal circuitry ensures power-up/power-down high-impedance state when OE is tied to VCC via external pullup; the device meets JEDEC JESD22-A110 (HAST), JESD22-A104 (temp cycle), and JESD22-A114 (autoclave) for extended reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports interoperability across 3.3 V and 5 V subsystems without level shifters |
| Max tpd @ 5 V | 7 ns - enables high-speed data transfer in real-time control loops and memory-mapped I/O |
| IOL / IOH | ±24 mA @ VCC = 4.5–5.5 V - drives standard TTL loads and multiple CMOS inputs without buffering |
| Input Voltage Tolerance | Up to 6 V regardless of VCC - allows safe interfacing with higher-voltage peripherals or legacy buses |
| Operating Temperature | −40°C to +85°C - qualified per enhanced DMS pedigree for industrial automation and avionics applications |
| Package Thermal Impedance | θJA = 58°C/W - supports continuous operation at full drive strength in compact PCB layouts |
| IOZ Leakage | ±5 µA max @ VCC = 5.5 V - ensures minimal bus leakage during isolation mode, critical for low-power sleep states |
Pinout & Package
SN74AC245IDWREP uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.4–7.6 mm body width, 12.6–13.0 mm length, and maximum height of 2.65 mm. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Low = A→B data flow; High = B→A data flow - determines physical signal path without clocking |
| 2–9 (A1–A8) | Port A I/O Terminals | Bidirectional data lines connected to first bus segment; tolerate VI up to 6 V |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-inductance connection |
| 11 (VCC) | Supply Voltage | Power rail for internal logic and output drivers; decoupling capacitor required within 1 cm |
| 12–19 (B1–B8) | Port B I/O Terminals | Bidirectional data lines connected to second bus segment; electrically identical to A-side |
| 20 (OE) | Output Enable Input | Active-low control: Low = enabled transceiver; High = high-Z isolation - requires pullup for safe power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Product Change Notification | Guaranteed 10+ year supply continuity with advance notification of any process or material change |
| Controlled Baseline Manufacturing | Single assembly/test site and single fabrication site - ensures consistent parametric performance across production lots |
| JEDEC-Qualified Reliability | HAST, temp cycle, autoclave, electromigration, and bond intermetallic testing performed - validated for 15+ year field life |
| Voltage-Tolerant Inputs | Accepts 0–6 V inputs irrespective of VCC setting - eliminates external clamping diodes in mixed-supply systems |
| Asynchronous Bus Isolation | OE-driven high-impedance state prevents bus contention during hot-swap or partial system reset sequences |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) Data Hub |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular PLC chassis with varying supply rails. IC Role / Device Role / Timing Role: Octal bus transceiver managing address/data strobe handshaking between 3.3 V controller and 5 V peripheral cards. Use Value: Eliminates need for discrete level shifters while maintaining <7 ns propagation delay for deterministic scan-cycle timing. |
Use Scenario: Interfacing microcontroller UART/parallel debug port with legacy CAN/LIN transceiver diagnostic interfaces in BCM. IC Role / Device Role / Timing Role: Direction-controlled bus bridge isolating MCU core from noisy automotive bus domains during firmware updates. Use Value: ±24 mA drive strength sustains signal integrity over 15 cm PCB traces; OE-controlled isolation prevents fault propagation. |
| Military Avionics Sensor Aggregation | Ruggedized Test Equipment Data Acquisition |
|
Use Scenario: Consolidating analog-to-digital converter outputs from multiple sensor nodes into a central processing unit in flight control systems. IC Role / Device Role / Timing Role: Synchronized bus transceiver enabling time-aligned sampling across distributed ADC modules operating at different VCC levels. Use Value: −40°C to +85°C qualification and HAST-tested reliability ensure uninterrupted operation under rapid thermal cycling conditions. |
Use Scenario: Connecting FPGA-based pattern generator to DUT interface board with mixed 2.5 V/3.3 V/5 V logic families in automated test fixtures. IC Role / Device Role / Timing Role: Reconfigurable bus coupler supporting both stimulus injection and response capture modes via DIR/OE control. Use Value: Input voltage tolerance up to 6 V permits direct connection to legacy TTL test instruments without signal degradation. |
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 | Lower VCC range (1.65–3.6 V); 3.3 V only; no 6 V input tolerance | Suitable for modern low-voltage digital systems but incompatible with 5 V legacy buses | Select when full 5 V bus compatibility is unnecessary and power efficiency below 2 V is prioritized |
| SN74AC245N | Same logic and timing specs, but commercial-grade (0°C to 70°C) and non-EP packaging | Lacks enhanced reliability testing, DMS support, and extended temperature range | Choose only for cost-sensitive, non-critical consumer applications where long-term supply stability is not required |
Compared with SN74LVC245A and SN74AC245N, the SN74AC245IDWREP uniquely combines 2–6 V operation, 6 V-tolerant inputs, −40°C to 85°C qualification, and JEDEC-verified reliability - making it the sole option for industrial backplanes and military sensor hubs requiring mixed-voltage interoperability and field longevity.
Availability
SN74AC245IDWREP is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, military avionics sensor aggregation, ruggedized test equipment, and embedded data acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AC245IDWREP 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 connectivity technologies with over 90 years of innovation in industrial, automotive, and aerospace markets.
The SN74AC245IDWREP belongs to TI's Enhanced Product (EP) logic family, engineered specifically for mission-critical applications demanding extended temperature operation, long-term supply assurance, and rigorous reliability validation beyond commercial-grade components.
FAQ
What is the maximum input voltage the SN74AC245IDWREP can safely accept?
The SN74AC245IDWREP accepts input voltages up to 6 V regardless of VCC level - a key feature enabling direct interfacing with 5 V peripherals on 3.3 V systems without external level-shifting circuitry. This specification is guaranteed across the full −40°C to +85°C operating range and is validated per absolute maximum ratings in the official datasheet SCAS780.
Does the SN74AC245IDWREP require external pull-up resistors on the OE pin?
Yes - to ensure high-impedance state during power-up or power-down, OE must be tied to VCC through an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source, as specified in the functional description section of the SN74AC245IDWREP datasheet. Failure to implement this may cause bus contention or undefined logic states at startup.
Is the SN74AC245IDWREP pin-compatible with the standard SN74AC245N?
Yes - the SN74AC245IDWREP shares identical pinout, electrical behavior, and SOIC-20 (DW) package dimensions with the commercial SN74AC245N. However, the IDWREP variant adds enhanced reliability testing, extended temperature qualification, and controlled baseline manufacturing - making it a drop-in replacement where robustness and long-term supply are required.
What is the typical power dissipation capacitance of the SN74AC245IDWREP?
The SN74AC245IDWREP has a typical power dissipation capacitance (Cpd) of 45 pF per transceiver channel at VCC = 5 V, f = 1 MHz, and CL = 50 pF. This value directly impacts dynamic power consumption in high-frequency bus applications and is measured under standardized load conditions defined in the switching characteristics section of the SN74AC245IDWREP datasheet.
Can the SN74AC245IDWREP be used in automotive applications?
The SN74AC245IDWREP is not AEC-Q200 qualified and is not recommended for automotive safety-critical systems. For automotive use, TI offers the pin-compatible SN74AC245-Q1, which undergoes full AEC-Q100 stress testing and is qualified for operation from −40°C to +125°C. The SN74AC245IDWREP remains suitable for non-safety automotive test equipment and aftermarket diagnostics where extended temperature support is needed but automotive qualification is not mandated.
SN74AC245IDWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74AC245IDWREP FAQ
1.How can I place an order for SN74AC245IDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245IDWREP 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 SN74AC245IDWREP reliable?
The price and inventory of SN74AC245IDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245IDWREP is usually 5 days.
3.What payment methods are accepted for SN74AC245IDWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC245IDWREP transactions.
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4.How is shipping managed for SN74AC245IDWREP?
SN74AC245IDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245IDWREP 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 SN74AC245IDWREP?
For technical support, including SN74AC245IDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245IDWREP requirements.
6.How does Aetrix verify that SN74AC245IDWREP is sourced from the original manufacturer or authorized distributors?
All SN74AC245IDWREP 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 SN74AC245IDWREP meets industry standards.
7.What is the process for return or replacement of SN74AC245IDWREP?
All SN74AC245IDWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245IDWREP, 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 SN74AC245IDWREP part is unused and in its original packaging.
Return procedure for SN74AC245IDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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