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Texas Instruments SN74ACT245WRKSRQ1
- Part No.:
- SN74ACT245WRKSRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74ACT245WRKSRQ1.pdf
- Description:
- AUTOMOTIVE OCTAL BUS TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SN74ACT245WRKSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal bus transceiver with 3-state outputs, operating from 4.5V to 5.5V, delivering ±24mA continuous output drive and supporting up to ±75mA short-burst drive at 5V, used for bidirectional signal redriving in vehicle body control modules and infotainment interconnects.
For engineers reviewing the SN74ACT245WRKSRQ1 datasheet, SN74ACT245WRKSRQ1 pinout, SN74ACT245WRKSRQ1 application, or SN74ACT245WRKSRQ1 equivalent, key selection criteria include automotive temperature range (-40°C to +125°C), wettable-flank VQFN-20 (RKS) package compatibility with AOI inspection, TTL-compatible input thresholds, and precise 3-state timing (tpd ≤ 10ns, ten ≤ 13ns).
Technical Context
The SN74ACT245WRKSRQ1 implements dual-directional CMOS transceivers with shared DIR and OE control logic: DIR selects data flow direction (A→B or B→A), while active-low OE enables/disables all eight channels simultaneously into high-impedance state. Each channel features balanced push-pull outputs capable of sourcing/sinking equal current.
It uses TTL-compatible input thresholds (VIL = 0.8V, VIH = 2.0V) and drives 50Ω transmission lines directly. Its 3-state outputs support hot-swap operation and bus isolation during controller reset, with clamping diodes on all I/O pins meeting AEC-Q100 HBM ±2kV and CDM ±1kV ESD requirements.
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. |
| Propagation Delay | ≤10ns max (VCC = 5V, CL = 50pF) - enables reliable high-speed data transfer between microcontrollers and peripherals in real-time systems. |
| Output Drive | ±24mA continuous - sufficient to drive multiple CMOS inputs or LED indicators without external buffers. |
| 3-State Enable Time | ten ≤ 13ns - guarantees fast bus release for time-critical arbitration in multiprocessor communication links. |
| Input Compatibility | TTL-compatible (VIH = 2.0V, VIL = 0.8V) - interoperable with legacy 5V microcontrollers and logic families without level-shifting. |
| ESD Rating | HBM ±2000V, CDM ±1000V - meets automotive robustness requirements for assembly and field operation. |
Pinout & Package
VQFN-20 package (RKS) with wettable flanks (4.5mm × 2.5mm body), thermal pad exposed on bottom for enhanced thermal dissipation and AOI-compatible solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | L = B→A data flow; H = A→B data flow - single-pin bidirectional bus management without external logic. |
| OE (Pin 19) | Active-low output enable | Drives all eight transceiver outputs into high-impedance when high - enables bus sharing and prevents contention. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data interface for microcontroller-side signals; internally buffered with TTL-compatible inputs. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data interface for peripheral-side signals; matched drive strength and timing to Port A. |
| VCC (Pin 20) | Positive supply | 5V nominal supply connection; requires local 0.1µF bypass capacitor to suppress switching noise. |
| GND (Pin 10) | Ground reference | Return path for all I/O and supply currents; connects to thermal pad for improved thermal performance. |
| Thermal Pad | Exposed copper pad | Must be connected to GND plane for optimal thermal resistance (RθJB = 40.1°C/W) and mechanical reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Wettable-flank QFN (RKS) | Enables automated optical inspection (AOI) of side-solder joints - critical for zero-defect automotive manufacturing yield. |
| Balanced CMOS 3-state outputs | Sources and sinks identical ±24mA continuously - eliminates need for external pull-ups/pull-downs in bus hold applications. |
| TTL-compatible inputs | VIH = 2.0V / VIL = 0.8V thresholds - ensures direct interfacing with legacy 5V MCUs and logic without level translation. |
| Short-burst drive capability | Supports ±75mA peak for <100ns - allows driving capacitive loads like long PCB traces or connector stubs without waveform degradation. |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation with HBM ±2kV and CDM ±1kV ESD - meets Tier-1 supplier requirements. |
Applications
| Body Control Module (BCM) Signal Redriving | Infotainment Display Interface |
|---|---|
Use Scenario: Extending SPI or parallel control signals from BCM MCU to door module actuators over >15cm PCB traces. IC Role / Device Role / Timing Role: Bidirectional bus transceiver isolating MCU from noisy actuator return paths while maintaining sub-10ns timing integrity. Use Value: Eliminates signal reflection and ground bounce via controlled 50Ω line driving and fast 3-state disable (ten ≤13ns) during mode transitions. |
Use Scenario: Interfacing application processor GPIOs to display driver ICs requiring 5V-tolerant, high-drive I/O. IC Role / Device Role / Timing Role: Level-shifting and current-boosting transceiver enabling 5V logic compatibility with modern low-voltage processors. Use Value: Delivers ±24mA drive at 5V to overcome display IC input capacitance while maintaining TTL-compatible input thresholds for seamless integration. |
| Instrument Cluster Data Multiplexing | ADAS Camera Sensor Interface |
Use Scenario: Sharing a single microcontroller data bus among multiple analog gauge drivers and digital displays. IC Role / Device Role / Timing Role: 3-state bus transceiver enabling time-multiplexed access to shared resources without hardware contention. Use Value: High-impedance isolation (IOZ ≤ ±10µA) prevents backfeeding between subsystems; OE-controlled disable ensures glitch-free bus arbitration. |
Use Scenario: Redriving serialized camera sensor data (e.g., LVDS or sub-LVDS) across rigid-flex cable assemblies in rear-view systems. IC Role / Device Role / Timing Role: Low-skew signal conditioner preserving edge integrity for high-speed pixel clock and data lanes. Use Value: 10ns max propagation delay and matched A/B channel timing (tsk(o) ≤1ns) maintain pixel alignment across multi-lane interfaces. |
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 voltage range (1.65V–3.6V); 3.3V-only operation; lower drive (±24mA @ 3.3V) | Designed for 3.3V automotive domains (e.g., ADAS SoCs); not suitable for 5V legacy buses | Select when system operates exclusively at 3.3V and requires lower power consumption. |
| MC74VHC245DTG | Non-automotive grade; no AEC-Q100 qualification; wider temp range (-55°C to +125°C) but no HBM/CDM certification | Acceptable for industrial or commercial designs where automotive qualification is not required | Choose only for non-automotive applications needing identical pinout and function without automotive compliance overhead. |
Compared with SN74ACT245WRKSRQ1, SN74LVC245AQPWRQ1 reduces supply voltage flexibility but cuts dynamic power by ~40% at 3.3V, while MC74VHC245DTG offers broader temperature tolerance without automotive validation-making SN74ACT245WRKSRQ1 the sole choice for 5V AEC-Q100-compliant redriving.
Availability
SN74ACT245WRKSRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, infotainment display interconnects, and ADAS sensor signal conditioning requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SN74ACT245WRKSRQ1 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 and embedded processing technologies, with decades of automotive-grade product development and manufacturing expertise.
The SN74ACT245WRKSRQ1 belongs to TI's automotive logic portfolio, engineered specifically for robust bidirectional data routing in harsh-temperature vehicle networks where signal integrity, ESD resilience, and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum continuous output current specification for SN74ACT245WRKSRQ1?
The SN74ACT245WRKSRQ1 supports ±24mA continuous output current per channel at VCC = 5V, as specified in Section 5.3 Recommended Operating Conditions. This rating applies across the full automotive temperature range (-40°C to +125°C) and ensures reliable drive capability into standard CMOS loads without thermal derating under typical board-level conditions.
Does SN74ACT245WRKSRQ1 require external pull-up resistors on unused inputs?
Yes - SN74ACT245WRKSRQ1 has TTL-compatible CMOS inputs that must never be left floating. Unused inputs should be terminated to VCC or GND using a 10kΩ resistor, as recommended in Section 7.3.2 and Section 8.3.2, to prevent oscillation, excessive power draw, and undefined logic states during system operation.
Can SN74ACT245WRKSRQ1 drive 50Ω transmission lines directly?
Yes - SN74ACT245WRKSRQ1 is explicitly characterized to drive 50Ω transmission lines, as stated in the Features section and validated in Section 8.1 Application Information. Its output drive strength and edge rate control enable clean signal integrity on properly terminated lines up to 12cm in length without external series damping resistors.
What is the purpose of the thermal pad on the RKS package of SN74ACT245WRKSRQ1?
The exposed thermal pad on the SN74ACT245WRKSRQ1 RKS package must be connected to the PCB GND plane to achieve optimal thermal performance. As shown in Table 5.4, this connection reduces junction-to-board thermal resistance to 40.1°C/W - critical for maintaining safe junction temperatures during sustained ±24mA output operation in high-ambient automotive environments.
How does the DIR pin control data flow direction in SN74ACT245WRKSRQ1?
In SN74ACT245WRKSRQ1, the DIR pin determines bidirectional data path: when DIR = LOW, data flows from Port B to Port A (B→A); when DIR = HIGH, data flows from Port A to Port B (A→B). This single-pin control eliminates external logic gates and enables dynamic bus reversal in real-time automotive communication protocols.
SN74ACT245WRKSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-VFQFN Exposed Pad
- 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, Wettable Flank
- Supplier Device Package:
- 20-VQFN (2.5x4.5)
SN74ACT245WRKSRQ1 FAQ
1.How can I place an order for SN74ACT245WRKSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245WRKSRQ1 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 SN74ACT245WRKSRQ1 reliable?
The price and inventory of SN74ACT245WRKSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245WRKSRQ1 is usually 5 days.
3.What payment methods are accepted for SN74ACT245WRKSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT245WRKSRQ1 transactions.
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4.How is shipping managed for SN74ACT245WRKSRQ1?
SN74ACT245WRKSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245WRKSRQ1 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 SN74ACT245WRKSRQ1?
For technical support, including SN74ACT245WRKSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245WRKSRQ1 requirements.
6.How does Aetrix verify that SN74ACT245WRKSRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74ACT245WRKSRQ1 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 SN74ACT245WRKSRQ1 meets industry standards.
7.What is the process for return or replacement of SN74ACT245WRKSRQ1?
All SN74ACT245WRKSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245WRKSRQ1, 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 SN74ACT245WRKSRQ1 part is unused and in its original packaging.
Return procedure for SN74ACT245WRKSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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