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Texas Instruments SN74AHC245QDWRG4Q1
- Part No.:
- SN74AHC245QDWRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC245QDWRG4Q1.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:547
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Product details
Overview
SN74AHC245QDWRG4Q1 from Texas Instruments is an automotive-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 2-V to 5.5-V systems. It features direction control (DIR), output-enable (OE), ±8-mA drive at 5 V, 5.5-ns typical propagation delay (VCC = 5 V, CL = 15 pF), and latch-up immunity exceeding 250 mA per JESD 17 - used in automotive infotainment backplane isolation and ECU inter-bus communication.
For engineers reviewing the SN74AHC245QDWRG4Q1 datasheet, SN74AHC245QDWRG4Q1 pinout, SN74AHC245QDWRG4Q1 application, or SN74AHC245QDWRG4Q1 equivalent, key selection criteria include its AEC-Q100 qualification, SOIC-20 package thermal resistance (θJA = 58°C/W), 3-state output isolation timing (tPZH/tPLZ ≤ 9.2 ns at 5 V), and compatibility with 2.0-V to 5.5-V mixed-voltage bus interfacing.
Technical Context
This device implements dual-rail bidirectional data routing using a single DIR input to select A→B or B→A flow, while OE independently places all outputs in high-impedance state - enabling true bus isolation without external logic. Its AHC logic family ensures CMOS-level noise immunity, rail-to-rail output swing, and low static current (ICC ≤ 40 µA).
Switching performance is load-dependent: propagation delays range from 4 ns (min) to 6.5 ns (max) at VCC = 5 V and CL = 15 pF, while enable/disable times (tPZH/tPHZ) are specified down to 5.6 ns. Input transition rate limits (20 ns/V at 5 V) ensure robust operation with slow-edge microcontroller signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3-V MCU to 5-V peripheral bus) |
| IOH/IOL | ±8 mA at VCC = 5 V - drives standard TTL loads and short PCB traces without buffering |
| tPLH/tPHL | 4–6.5 ns (VCC = 5 V, CL = 15 pF) - enables >100-MHz burst data handshaking in synchronous protocols |
| tPZH/tPHZ | 5.6–9.2 ns (VCC = 5 V, CL = 15 pF) - guarantees sub-10-ns bus release for time-critical arbitration |
| VIH/VIL | 3.85 V / 1.65 V at VCC = 5.5 V - provides 0.65-V noise margin against VCC/2 threshold drift |
| Latch-up | >250 mA per JESD 17 - withstands transient ground bounce and supply coupling in automotive harnesses |
| Operating Temp | –40°C to +125°C - qualified for under-hood and transmission-control module environments |
Pinout & Package
SN74AHC245QDWRG4Q1 uses a 20-pin SOIC (DW) package with 1.27-mm pitch, 12.6–13.0 mm body length, and 7.4–7.6 mm width. Maximum height is 2.65 mm. Pin 1 identifier is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time bus polarity without reset |
| 2–9 (A1–A8) | Bus A I/O terminals | Bi-directional data ports tied to one system bus; internally isolated when OE = High |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic - must be low-inductance connection in automotive layouts |
| 11 (VCC) | Power supply | 2-V to 5.5-V core and I/O rail - decoupling capacitor required within 10 mm of this pin |
| 12–19 (B1–B8) | Bus B I/O terminals | Bi-directional data ports tied to second system bus; functionally identical to A-side but electrically isolated |
| 20 (OE) | Output-enable input | Active-Low: Low = transceiver enabled; High = all A/B pins in high-Z - critical for hot-swap and power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Meets Grade 1 automotive reliability requirements including temperature cycling, HTOL, and ESD (HBM ≥ 2 kV) |
| 3-State Output Isolation | Outputs achieve <±2.5 µA leakage (IOZ) when OE = High - prevents bus contention during sleep mode |
| Wide Supply Range | Operates from 2 V to 5.5 V without level-shifting - simplifies integration across legacy and modern voltage domains |
| High Noise Immunity | VIH/VIL thresholds scale with VCC (e.g., 3.85 V/1.65 V at 5.5 V) - rejects coupled noise in noisy engine compartments |
| Controlled Edge Rates | Input transition limit of 20 ns/V at 5 V - suppresses crosstalk and EMI in dense PCB routing |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating CAN microcontroller data bus from high-noise LIN sensor cluster wiring. IC Role / Device Role / Timing Role: Bidirectional data bridge that routes diagnostic commands from MCU to LIN transceivers while blocking reverse noise injection. Use Value: Prevents false LIN frame errors during ignition pulses by enforcing 9.2-ns max disable time and 250-mA latch-up immunity. | Use Scenario: Interfacing 3.3-V FPGA I/O bank to legacy 5-V I/O modules on modular PLC carrier board. IC Role / Device Role / Timing Role: Voltage-tolerant bus transceiver enabling safe, glitch-free data exchange between mismatched logic families. Use Value: Eliminates need for discrete level shifters via 2-V to 5.5-V VCC support and rail-swing outputs - reduces BOM count by 12 components per slot. |
| Automotive Infotainment Head Unit | Medical Diagnostic Equipment Data Bus |
Use Scenario: Sharing audio DSP memory space between ARM application processor and dedicated audio codec ASIC. IC Role / Device Role / Timing Role: Octal bidirectional data conduit synchronized to processor address strobes, with DIR toggled per access direction. Use Value: Enables zero-wait-state memory-mapped I/O using 4-ns min propagation delay - improves real-time audio buffer throughput by 18%. | Use Scenario: Connecting radiation-hardened microcontroller to analog front-end ADC/DAC modules in portable ultrasound units. IC Role / Device Role / Timing Role: Safe, isolated data path ensuring no DC or transient coupling between digital control and sensitive analog signal chains. Use Value: Achieves <±2.5 µA off-state leakage (IOZ) and 0.1-V VOL/VOH variation over temperature - preserves 16-bit ADC linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245AQPWRQ1 | Lower drive (±24 mA), 1.65–5.5-V VCC, TSSOP-20 only | Better suited for high-speed 3.3-V-only systems; lacks SOIC option and higher latch-up rating | Select when higher output current and TSSOP footprint are prioritized over automotive SOIC compatibility |
| MC74VHC245DTG | Non-automotive grade, –40°C to +85°C, same SOIC-20 pinout | Not AEC-Q100 qualified; lower latch-up rating (100 mA); intended for industrial/commercial use only | Select for cost-sensitive non-automotive designs where full automotive qualification is unnecessary |
Compared with SN74AHC245QDWRG4Q1, SN74LVC245AQPWRQ1 offers greater drive strength but requires TSSOP assembly and lacks SOIC availability, while MC74VHC245DTG matches the pinout and package but omits automotive qualification, latch-up robustness, and extended temperature support.
Availability
SN74AHC245QDWRG4Q1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC backplanes, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC245QDWRG4Q1 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 over 90 years of innovation in power management and signal chain solutions.
The SN74AHC245Q series belongs to TI's automotive logic portfolio, engineered specifically for robust bidirectional data routing in harsh-temperature, high-reliability vehicle subsystems such as BCMs and infotainment gateways.
FAQ
What is the AEC-Q100 qualification status of SN74AHC245QDWRG4Q1?
SN74AHC245QDWRG4Q1 is AEC-Q100 qualified per Grade 1 (–40°C to +125°C), with test reports covering HTOL, temperature cycling, and ESD (HBM ≥ 2 kV). This qualification is documented in TI's official automotive product change notices and applies specifically to the DW package variant with G4Q1 suffix, confirming suitability for under-hood and transmission-control applications.
Can SN74AHC245QDWRG4Q1 operate reliably at 2.0 V supply?
Yes, SN74AHC245QDWRG4Q1 is fully specified down to 2.0 V VCC, with guaranteed VIH = 1.5 V and VIL = 0.5 V at that voltage, and functional tPLH/tPHL ≤ 10 ns (CL = 15 pF). Its AHC logic family maintains rail-to-rail output swing and noise margins even at minimum VCC, making it suitable for battery-backed or low-power automotive subsystems.
How should OE be handled during power-up to ensure high-impedance state?
To guarantee high-impedance outputs at power-up, OE of SN74AHC245QDWRG4Q1 must be held High via a pullup resistor to VCC. TI specifies minimum resistor value based on driver sink capability; for typical use, a 10-kΩ resistor suffices. Floating OE is prohibited - it may cause bus contention or excessive ICC until stable logic levels are established.
Does SN74AHC245QDWRG4Q1 support hot insertion into a live bus?
SN74AHC245QDWRG4Q1 supports hot insertion only when OE is held High (outputs disabled) prior to connection. Its absolute maximum ratings allow VI up to 7 V and clamp current ±20 mA, but sustained bus contention during insertion can exceed IO limits. For true hot-swap, external current-limiting or dedicated hot-swap controllers are recommended alongside proper OE sequencing.
What is the thermal resistance θJA for SN74AHC245QDWRG4Q1 in its SOIC package?
The junction-to-ambient thermal resistance (θJA) of SN74AHC245QDWRG4Q1 in the SOIC (DW) package is 58°C/W, measured under standard JEDEC conditions (2S2P layout, 1-inch² copper pad). This value assumes proper PCB copper pour and thermal vias; actual system θJA may vary by ±15% depending on board stack-up and airflow.
SN74AHC245QDWRG4Q1 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:
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC245QDWRG4Q1 FAQ
1.How can I place an order for SN74AHC245QDWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC245QDWRG4Q1 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 SN74AHC245QDWRG4Q1 reliable?
The price and inventory of SN74AHC245QDWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC245QDWRG4Q1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC245QDWRG4Q1 transactions.
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4.How is shipping managed for SN74AHC245QDWRG4Q1?
SN74AHC245QDWRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC245QDWRG4Q1 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 SN74AHC245QDWRG4Q1?
For technical support, including SN74AHC245QDWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC245QDWRG4Q1 requirements.
6.How does Aetrix verify that SN74AHC245QDWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC245QDWRG4Q1 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 SN74AHC245QDWRG4Q1 meets industry standards.
7.What is the process for return or replacement of SN74AHC245QDWRG4Q1?
All SN74AHC245QDWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC245QDWRG4Q1, 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 SN74AHC245QDWRG4Q1 part is unused and in its original packaging.
Return procedure for SN74AHC245QDWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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