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Texas Instruments SN74ACT245PWRQ1
- Part No.:
- SN74ACT245PWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT245PWRQ1.pdf
- Description:
- BUS TRANSCEIVERS
- Quantity:
- Payment:
- Shipping:
Inventory:4,745
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Product details
Overview
SN74ACT245PWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal bus transceiver with 3-state outputs, bidirectional data flow controlled by DIR and OE pins, operating at 4.5V–5.5V supply, delivering ±24mA continuous output drive and supporting 50Ω transmission line driving in vehicle body control, infotainment interconnect, and ADAS sensor interface applications.
For engineers reviewing the SN74ACT245PWRQ1 datasheet, SN74ACT245PWRQ1 pinout, SN74ACT245PWRQ1 application, or SN74ACT245PWRQ1 equivalent, key selection criteria include automotive temperature range (-40°C to +125°C), wettable-flank VQFN package compatibility with AOI inspection, TTL-compatible input thresholds, and precise 3-state timing (tpd ≤ 10ns, ten ≤ 13ns at 5V).
Technical Context
The SN74ACT245PWRQ1 implements eight independent bidirectional CMOS transceivers sharing a single direction control (DIR) and active-low output enable (OE). Its balanced push-pull outputs support symmetrical sourcing/sinking up to ±24mA continuously and ±75mA in short bursts, enabling robust signal redriving across PCB traces and cables.
It features TTL-compatible inputs (VIH = 2V min, VIL = 0.8V max), 50pF load-optimized switching (tpd ≤ 10ns), and integrated clamp diodes for ESD protection per AEC-Q100 HBM ±2000V and CDM ±1000V. The device enters high-impedance state when OE is high, regardless of DIR state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - Ensures stable operation across automotive battery variations including cold-crank (4.5V) and load-dump (5.5V) conditions. |
| Operating Temperature | -40°C to +125°C - Qualified per AEC-Q100 Grade 1 for under-hood and cabin-mounted ECUs. |
| Output Drive (Continuous) | ±24mA at 5V - Sustains reliable logic-level signaling into typical CMOS/TTL loads without thermal derating. |
| Propagation Delay | ≤10ns at VCC = 5V, CL = 50pF - Enables high-speed data transfer between microcontrollers and peripherals in real-time systems. |
| Input Thresholds | VIH ≥ 2V, VIL ≤ 0.8V - Guarantees interoperability with legacy 5V TTL logic families without level-shifting. |
| ESD Rating | HBM ±2000V, CDM ±1000V - Meets automotive ESD immunity requirements for assembly and field operation. |
| 3-State Enable Time | ten ≤ 13ns - Allows fast bus arbitration and dynamic channel switching in multiplexed architectures. |
Pinout & Package
SN74ACT245PWRQ1 is packaged in a 20-pin wettable-flank VQFN (RKS) measuring 4.5mm × 2.5mm with exposed thermal pad. This package supports automated optical inspection (AOI) via side-fillet formation and provides low thermal resistance (RθJA = 66.5°C/W, RθJB = 40.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | L = B→A data flow; H = A→B data flow - Determines real-time bidirectional path for all eight channels. |
| A1–A8 (Pins 2–9) | Transceiver port A I/O | Eight bidirectional data lines connected to one bus segment (e.g., MCU side); high-impedance when OE = H or opposing direction inactive. |
| GND (Pin 10) | Ground reference | Primary return path for all output currents and internal logic; must be low-inductance connection for signal integrity. |
| B8–B1 (Pins 11–18) | Transceiver port B I/O | Eight bidirectional data lines connected to second bus segment (e.g., peripheral side); electrically isolated from A-side when in high-Z. |
| OE (Pin 19) | Active-low output enable | Drives all outputs to high-impedance when high - essential for bus sharing and hot-swap isolation. |
| VCC (Pin 20) | Positive supply | 5V nominal power rail; requires local 0.1μF bypass capacitor adjacent to pin for noise suppression and transient current delivery. |
| Thermal Pad | Exposed die attach pad | Connected to GND for enhanced thermal dissipation and EMI reduction; not electrically functional if left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Wettable-flank QFN package | Enables reliable AOI-based solder-joint inspection on automotive production lines without X-ray. |
| Balanced CMOS 3-state outputs | Sources and sinks equal current (±24mA), minimizing ground bounce and ensuring clean bus release during direction changes. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels directly, eliminating need for external level translators in mixed-logic systems. |
| Fast 3-state timing | Enable/disable delay (ten/tdis ≤ 13ns) allows sub-100ns bus turnaround - critical for time-sensitive CAN/LIN gateway buffering. |
| AEC-Q100 Grade 1 qualification | Validated for full automotive temperature range and ESD stress, reducing qualification effort for Tier 1 suppliers. |
Applications
| Body Control Module (BCM) Data Hub | Infotainment Display Interface |
|---|---|
|
Use Scenario: Aggregating signals from door modules, seat sensors, and lighting controllers onto a centralized CAN/LIN gateway MCU. IC Role / Device Role / Timing Role: Bidirectional level-shifting and signal redriving transceiver isolating MCU GPIOs from noisy chassis-ground-referenced peripherals. Use Value: Prevents ground-loop interference and enables hot-swappable module replacement while maintaining <10ns propagation delay for real-time status updates. |
Use Scenario: Interfacing a display controller ASIC with multiple touch, backlight, and audio codec ICs on a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Octal bus buffer with 3-state control allowing dynamic bus ownership between display processor and auxiliary peripherals. Use Value: Eliminates contention during simultaneous access attempts and sustains 50Ω transmission line drive for clean video timing signals over 15cm flex traces. |
| ADAS Camera Sensor Interface | Powertrain ECU Diagnostic Port |
|
Use Scenario: Redriving serialized camera pixel data from image sensor to SoC over extended PCB traces subject to EMI. IC Role / Device Role / Timing Role: Low-skew, high-drive transceiver placed near sensor connector to restore signal integrity before entering noisy engine bay routing. Use Value: Delivers ±75mA peak drive capability to overcome trace capacitance-induced rise/fall time degradation while meeting AEC-Q100 thermal limits. |
Use Scenario: Isolating diagnostic UART lines between engine control unit and service tool connector to prevent backfeed during firmware update. IC Role / Device Role / Timing Role: Direction-controlled transceiver enabling bidirectional K-line or UART communication with hardware-enforced bus direction lock. Use Value: Provides fail-safe 3-state disable (via OE) during reset sequences, preventing spurious commands from corrupting flash programming operations. |
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 voltage range (1.65V–3.6V), lower drive (±24mA), non-wettable QFN | Targeted for 3.3V automotive domains (e.g., infotainment SoCs); lacks 5V TTL compatibility | Select when interfacing with 3.3V logic only and AOI inspection is not required. |
| MC74VHC245DTG | Non-automotive grade, wider VCC (2V–5.5V), no AEC-Q100 qualification, SOIC-20 package | Suitable for industrial or consumer prototypes; lacks automotive temp/ESD validation and wettable flank | Use for cost-sensitive non-automotive designs where qualification overhead is unnecessary. |
Compared with SN74ACT245PWRQ1, SN74LVC245AQPWRQ1 offers lower-voltage compatibility but sacrifices 5V TTL interoperability and AOI-ready packaging, while MC74VHC245DTG provides broader voltage flexibility at the expense of automotive reliability assurance and modern package manufacturability.
Availability
SN74ACT245PWRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, infotainment interconnect, and ADAS sensor interface applications requiring stable component supply across extended product lifecycles.
Supply support for SN74ACT245PWRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade logic, power management, and signal chain solutions.
The SN74ACT245PWRQ1 belongs to TI's automotive-qualified logic portfolio, designed specifically to meet stringent AEC-Q100 requirements for signal integrity, thermal resilience, and long-term reliability in vehicle electronic control units.
FAQ
What is the maximum continuous output current rating for SN74ACT245PWRQ1?
The SN74ACT245PWRQ1 supports ±24mA continuous output current per channel at VCC = 5V, as specified in the Recommended Operating Conditions table. This rating ensures stable logic-level performance under sustained load without thermal throttling or parametric shift across the -40°C to +125°C automotive temperature range.
Does SN74ACT245PWRQ1 support 3.3V logic interfaces?
SN74ACT245PWRQ1 is not rated for 3.3V-only operation: its minimum supply voltage is 4.5V, and its TTL-compatible inputs require VIH ≥ 2V and VIL ≤ 0.8V - making it incompatible with standard 3.3V LVTTL or LVCMOS logic without level translation. For 3.3V systems, consider SN74LVC245AQPWRQ1 instead.
How does the wettable flank feature benefit SN74ACT245PWRQ1 in automotive manufacturing?
The wettable flank on the SN74ACT245PWRQ1's RKS VQFN package enables visible side-fillet formation during reflow soldering, allowing automated optical inspection (AOI) to verify solder joint quality without X-ray. This reduces process validation time and improves first-pass yield in high-volume automotive PCB assembly lines.
Can SN74ACT245PWRQ1 drive 50Ω transmission lines directly?
Yes, SN74ACT245PWRQ1 is explicitly characterized to drive 50Ω transmission lines, as confirmed in the Features section and supported by its ±24mA continuous drive strength and 10ns max propagation delay at CL = 50pF. Proper series termination (e.g., 22Ω–33Ω) is recommended to suppress ringing on longer traces.
What happens to SN74ACT245PWRQ1 outputs when OE is high and DIR is toggled?
When OE is high, all outputs of SN74ACT245PWRQ1 enter high-impedance state regardless of DIR pin state - meaning neither A→B nor B→A paths are active. Toggling DIR has no effect on output behavior until OE is pulled low, ensuring safe bus isolation during system reset or configuration changes.
SN74ACT245PWRQ1 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT245PWRQ1 FAQ
1.How can I place an order for SN74ACT245PWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245PWRQ1 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 SN74ACT245PWRQ1 reliable?
The price and inventory of SN74ACT245PWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245PWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74ACT245PWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT245PWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT245PWRQ1?
SN74ACT245PWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245PWRQ1 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 SN74ACT245PWRQ1?
For technical support, including SN74ACT245PWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245PWRQ1 requirements.
6.How does Aetrix verify that SN74ACT245PWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74ACT245PWRQ1 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 SN74ACT245PWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74ACT245PWRQ1?
All SN74ACT245PWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245PWRQ1, 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 SN74ACT245PWRQ1 part is unused and in its original packaging.
Return procedure for SN74ACT245PWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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