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Texas Instruments SN74AHC245QDWR
- Part No.:
- SN74AHC245QDWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC245QDWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,237
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Product details
Overview
SN74AHC245QDWR from Texas Instruments is an automotive-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses. It operates from 2 V to 5.5 V, supports –40°C to 125°C ambient temperature, delivers ±8 mA output drive at 5 V, and features direction (DIR) and output-enable (OE) controls for flexible bus isolation in automotive infotainment backplanes.
For engineers reviewing the SN74AHC245QDWR datasheet, SN74AHC245QDWR pinout, SN74AHC245QDWR application, or SN74AHC245QDWR equivalent, key selection criteria include its AEC-Q100 qualification, SOIC-20 package thermal performance (θJA = 58°C/W), propagation delay ≤6.5 ns (VCC = 5 V, CL = 15 pF), and latch-up immunity >250 mA per JESD 17.
Technical Context
This device implements dual-bus bidirectional communication using a single DIR input to select data flow direction (A→B or B→A) and an active-low OE input to place all outputs in high-impedance state. Its CMOS AHC logic family ensures rail-to-rail output swing and low static current (ICC ≤ 40 µA).
Input thresholds scale with VCC: VIH = 3.85 V (min) and VIL = 1.65 V (max) at 5.5 V supply; noise margins exceed 0.9 V under dynamic conditions. The SOIC-20 package supports surface-mount reflow per JEDEC Level-1 (260°C peak, unlimited floor life).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables interoperability across 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay | ≤6.5 ns (tPLH/tPHL, VCC = 5 V, CL = 15 pF) - Supports >100 MHz bus toggle rates in compact timing budgets. |
| Output Drive | ±8 mA (IOH/IOL, VCC = 5 V) - Sustains signal integrity driving 15-pF loads across PCB traces and multiple inputs. |
| Operating Temperature | –40°C to 125°C - Qualified for under-hood and dashboard electronics per AEC-Q100 Grade 1 requirements. |
| 3-State Enable Time | tPZH/tPHZ ≤ 10 ns (VCC = 5 V, CL = 15 pF) - Enables fast bus arbitration and hot-swap isolation in modular systems. |
| Latch-Up Immunity | >250 mA per JESD 17 - Ensures robustness against transient ground bounce and ESD-induced parasitic conduction. |
Pinout & Package
SN74AHC245QDWR uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 12.8 mm × 7.5 mm body, and 2.65 mm max height. Pin 1 is located in quadrant Q1 per tape-and-reel standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: Low = B→A data flow; High = A→B data flow - enables single-wire bus arbitration. |
| 2–9 | A1–A8 | Bus A I/O terminals - connect to microcontroller or ASIC data port; tolerate 5.5 V inputs regardless of VCC. |
| 10 | GND | Ground reference - must be low-inductance connection to minimize switching noise coupling. |
| 11 | VCC | Power supply - bypass with 0.1 µF ceramic capacitor near pin to suppress high-frequency ripple. |
| 12–19 | B1–B8 | Bus B I/O terminals - interface to peripheral modules; share same voltage tolerance and drive strength as A-side. |
| 20 | OE | Active-low output enable - tie to VCC via pullup resistor during power-up to prevent bus contention. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified with customer-specific configuration control - meets OEM change management and traceability mandates. |
| Wide supply range | 2 V to 5.5 V operation - eliminates need for separate 3.3 V/5 V regulators in mixed-voltage systems. |
| High noise immunity | Dynamic VIH(D) = 3.5 V and VIL(D) = 1.5 V at 5 V supply - rejects >1 V of coupled noise on control lines. |
| Low power consumption | ICC ≤ 40 µA max at 5.5 V - reduces quiescent current in always-on vehicle networks. |
| Robust ESD protection | ±20 mA clamp current on I/O pins - withstands contact discharge per IEC 61000-4-2 Level 4 without external TVS. |
Applications
| Automotive Infotainment Backplane | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Bidirectional data routing between head-unit MCU and display/touch controller over shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Bus transceiver managing A→B and B→A transfers under DIR control; OE isolates buses during firmware updates. Use Value: Eliminates discrete logic gates and reduces PCB layer count by consolidating direction and enable functions into one 20-pin SOIC. |
Use Scenario: Extending local I/O capacity of a main PLC CPU to remote sensor/actuator modules via daisy-chained parallel interfaces. IC Role / Device Role / Timing Role: Isolating and buffering 8-bit data paths between CPU and expansion cards; DIR selects master/slave read/write direction. Use Value: Enables hot-plug capability via OE-controlled 3-state outputs, preventing bus contention during module insertion/removal. |
| Automotive ADAS Camera Interface | Medical Imaging Data Bridge |
|
Use Scenario: Interfacing 8-bit parallel output of image sensor to SoC video processor in driver-monitoring system. IC Role / Device Role / Timing Role: Level-shifting and bus-isolating transceiver operating at 5 V; DIR fixed for sensor→processor flow, OE synchronized to frame sync. Use Value: Meets AEC-Q100 thermal and reliability requirements while delivering sub-7 ns propagation delay for real-time pixel streaming. |
Use Scenario: Connecting legacy 8-bit CCD sensor array to modern FPGA-based image acquisition board in portable ultrasound devices. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling both sensor configuration writes and raw pixel reads; OE prevents data corruption during FPGA reconfiguration. Use Value: Provides guaranteed 2.0 V minimum VIH at 2 V supply - supports low-power sensor sleep modes without logic-level mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245AQPWRQ1 | Lower VCC min (1.65 V), higher speed (tPD ≤ 5.1 ns @ 3.3 V), but reduced latch-up immunity (≥100 mA) | Better suited for 1.8 V/3.3 V-only systems; not recommended for mixed 2 V–5.5 V environments requiring wide supply tolerance | Select when prioritizing speed and low-voltage compatibility over latch-up robustness and absolute max ratings. |
| MC74VHC245DTG | Same pinout, identical function, but non-automotive grade (–40°C to 85°C), no AEC-Q100 certification | Acceptable for commercial industrial equipment; unsuitable for automotive production due to missing PPAP documentation and qualification testing | Choose only for cost-sensitive non-automotive designs where extended temperature and automotive compliance are unnecessary. |
Compared with SN74AHC245QDWR, SN74LVC245AQPWRQ1 offers faster switching at lower voltages but sacrifices latch-up margin and supply flexibility, while MC74VHC245DTG provides functional equivalence without automotive qualification-making SN74AHC245QDWR the sole choice for AEC-Q100-compliant designs requiring 2 V–5.5 V operation and >250 mA latch-up immunity.
Availability
SN74AHC245QDWR is available at Aetrix Electronics and suitable for automotive infotainment backplanes, industrial PLC I/O expansion, and ADAS camera interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AHC245QDWR 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 automotive ICs, with decades of experience in high-reliability automotive electronics.
The SN74AHC245Q series belongs to TI's AHC logic family, engineered specifically for automotive applications demanding wide supply voltage range, extended temperature operation, and AEC-Q100 qualification.
FAQ
What is the maximum operating temperature for SN74AHC245QDWR?
The SN74AHC245QDWR is rated for continuous operation from –40°C to +125°C ambient temperature, meeting AEC-Q100 Grade 1 requirements for automotive under-hood and cabin applications. This rating is validated across the full 2 V to 5.5 V supply range and confirmed in the official TI datasheet SGDS018.
Does SN74AHC245QDWR support 3.3 V logic levels?
Yes, SN74AHC245QDWR fully supports 3.3 V operation: it meets all recommended operating conditions at VCC = 3.3 V ± 0.3 V, including VIH = 2.1 V (min), VIL = 0.9 V (max), tPD ≤ 8.4 ns, and IOH/IOL = ±4 mA. Its wide VCC range (2–5.5 V) ensures seamless interoperability with both 3.3 V and 5 V systems.
How should the OE pin be handled during power-up for SN74AHC245QDWR?
To ensure high-impedance state during power-up, OE of SN74AHC245QDWR must be tied to VCC through a pullup resistor. TI specifies the minimum resistor value based on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This prevents bus contention before system initialization completes.
Is SN74AHC245QDWR pin-compatible with SN74AHC245QPWR?
No - SN74AHC245QDWR (SOIC-20, DW package) and SN74AHC245QPWR (TSSOP-20, PW package) share identical pin functions and numbering but differ in physical dimensions, thermal characteristics (θJA = 58°C/W vs. 83°C/W), and board layout requirements. They are functionally equivalent but not mechanically interchangeable without PCB redesign.
What is the latch-up performance specification for SN74AHC245QDWR?
SN74AHC245QDWR exceeds 250 mA latch-up immunity per JESD 17, verified under worst-case conditions. This specification is explicitly stated in the "Q Devices Meet Automotive Performance Requirements" section of the SGDS018 datasheet and applies to the exact SN74AHC245QDWR part number as shipped in SOIC-DW packaging.
SN74AHC245QDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC245QDWR FAQ
1.How can I place an order for SN74AHC245QDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC245QDWR 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 SN74AHC245QDWR reliable?
The price and inventory of SN74AHC245QDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC245QDWR is usually 5 days.
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SN74AHC245QDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC245QDWR 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 SN74AHC245QDWR?
For technical support, including SN74AHC245QDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC245QDWR requirements.
6.How does Aetrix verify that SN74AHC245QDWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC245QDWR 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 SN74AHC245QDWR meets industry standards.
7.What is the process for return or replacement of SN74AHC245QDWR?
All SN74AHC245QDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC245QDWR, 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 SN74AHC245QDWR part is unused and in its original packaging.
Return procedure for SN74AHC245QDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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