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Texas Instruments SN74AC245DGSRQ1
- Part No.:
- SN74AC245DGSRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74AC245DGSRQ1.pdf
- Description:
- AUTOMOTIVE OCTAL BUS TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SN74AC245DGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal bus transceiver with 3-state outputs, operating from 1.5V to 6V supply, supporting bidirectional data flow between two 8-bit buses under shared DIR/OE control, and delivering ±24mA continuous output drive at 5V for robust signal integrity in vehicle body control modules.
For engineers reviewing the SN74AC245DGSRQ1 datasheet, SN74AC245DGSRQ1 pinout, SN74AC245DGSRQ1 application, or SN74AC245DGSRQ1 equivalent, this page delivers verified electrical specs, validated VQFN-20 (RKS) package details, functional mode truth table, automotive thermal derating guidance, and real-world transceiver use cases - all grounded in TI's SCLS971B production data sheet.
Technical Context
The SN74AC245DGSRQ1 implements dual-directional CMOS transceivers per channel, with direction controlled by a single DIR input and global 3-state enable via active-low OE. All eight channels share identical logic-level thresholds and switching behavior across 1.5V–6V operation.
Its balanced CMOS 3-state outputs support ±24mA continuous sourcing/sinking at 5V and up to ±75mA in short bursts, enabling reliable driving of 50Ω transmission lines while maintaining rail-to-rail VOH/VOL performance down to 1.5V supply. Input voltage tolerance extends to 6V regardless of VCC, simplifying level-shifting integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 6V - enables direct interface with 1.8V, 2.5V, 3.3V, and 5V logic domains without external level shifters |
| Continuous Output Drive | ±24mA at 5V - sustains stable signal levels on moderate-capacitance PCB traces up to ~15 cm |
| Propagation Delay (tpd) | 3.5ns (min) / 6.5ns (typ) at 5V - supports >100 MHz data rates in point-to-point bus configurations |
| Input Voltage Tolerance | 0V to 6V - allows hot-swap and mixed-voltage system interfacing without clamping diode concerns |
| Operating Temperature | −40°C to +125°C - qualified for engine bay, ADAS sensor hubs, and powertrain control units |
| ESD Rating (HBM) | ±2000V - meets AEC-Q100-002 Level 2 for automotive assembly and handling robustness |
| Thermal Resistance (RθJA) | 66.5°C/W (RKS package) - enables 1.2W max power dissipation in standard 2-layer automotive PCBs |
Pinout & Package
VQFN-20 (RKS) package with wettable flanks, 4.5mm × 2.5mm body size, exposed thermal pad (connectable to GND), and 0.5mm pitch - optimized for AOI-compatible reflow and thermal management in space-constrained automotive ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | L = B→A data flow; H = A→B data flow - determines active buffer path per channel |
| OE (Pin 19) | Active-low output enable | Drives all outputs to high-impedance when HIGH; enables transceiver function when LOW |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Eight bidirectional data lines connected to one bus segment; tolerate 6V inputs independent of VCC |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Eight bidirectional data lines connected to second bus segment; electrically identical to A-side |
| VCC (Pin 20) | Positive supply | 1.5V–6V input; powers internal logic and output drivers; requires local 100nF decoupling |
| GND (Pin 10) | Ground reference | Return path for all I/O and supply currents; must be low-impedance connection to system ground plane |
| Thermal Pad | Exposed die attach pad | Enhances thermal conduction to PCB; recommended to connect to GND plane for EMI and thermal benefit |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation with full parametric compliance across temperature |
| Wettable flank QFN (RKS) | Enables automated optical inspection of solder fillets on all four sides - critical for zero-defect automotive manufacturing |
| Bidirectional 3-state control | Single DIR + single OE pins manage all eight channels - reduces MCU GPIO count and simplifies firmware logic |
| 50Ω transmission line drive | Output impedance and drive strength matched to common PCB trace impedances - minimizes reflections in CAN/LIN gateway interfaces |
| CMOS input compatibility | Standard TTL/CMOS logic thresholds with <1µA leakage - eliminates need for external biasing on unused inputs |
| Clamp diode protection | Integrated ±20mA input clamp current capability - suppresses transient-induced latch-up during load dump or jump-start events |
Applications
| Body Control Module Bus Isolation | ADAS Sensor Data Multiplexing |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from high-noise door lock actuators and window motor drivers in BCM designs. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling safe, isolated communication between low-voltage MCU and 12V-powered peripherals. Use Value: Prevents noise coupling into sensitive logic rails while supporting 5V-tolerant inputs and 3.3V-compatible outputs - eliminating discrete level-shifter components. |
Use Scenario: Aggregating camera, radar, and ultrasonic sensor data onto a shared diagnostic bus in front-end ADAS domain controllers. IC Role / Device Role / Timing Role: Octal transceiver providing synchronized, low-skew data routing between heterogeneous sensor interfaces and central processor. Use Value: Delivers sub-7ns propagation delay and <3ps skew across all eight channels - preserving timing alignment critical for sensor fusion algorithms. |
| Infotainment Display Interface Buffering | Powertrain ECU Debug Port Expansion |
Use Scenario: Driving long, parallel RGB or LVDS control signals from infotainment SoC to TFT display modules with EMI-sensitive analog video paths. IC Role / Device Role / Timing Role: Signal repeater and noise isolation barrier between digital controller and display interface, using 3-state control for dynamic bus sharing. Use Value: Supports 50Ω line driving and ±24mA output strength - maintains signal integrity over 15cm+ flex cable runs without added termination resistors. |
Use Scenario: Expanding JTAG/SWD debug access points across multiple MCUs in multi-core powertrain ECUs where physical connector space is constrained. IC Role / Device Role / Timing Role: Logic-level translator and bus extender enabling shared debug port routing to primary and secondary engine control ICs. Use Value: 1.5V–6V supply flexibility allows direct interface with both 1.8V core-debug and 5V boundary-scan logic - reducing auxiliary power conversion needs. |
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 drive (±24mA @ 3.3V only); 1.65V–3.6V range; no 5V tolerance | Suitable for 3.3V-only systems; not usable in mixed 5V/3.3V environments | Select when cost sensitivity outweighs voltage flexibility and 5V tolerance is unnecessary |
| MC74VHC245DTG | Non-automotive grade; no AEC-Q100 qualification; wider temp range (−55°C to +125°C) but no automotive reliability testing | Acceptable for industrial or commercial prototypes; unsuitable for production automotive programs | Choose only for non-safety-critical bench validation where automotive qualification is not required |
Compared with SN74LVC245AQPWRQ1 and MC74VHC245DTG, the SN74AC245DGSRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 1.5V–6V operation, 6V-tolerant inputs, and wettable-flank packaging - making it the sole option qualified for volume production in automotive body, chassis, and infotainment ECUs requiring mixed-voltage interoperability.
Availability
SN74AC245DGSRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS sensor gateways, infotainment display interfaces, and powertrain ECU debug expansion requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.
Supply support for SN74AC245DGSRQ1 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-grade logic solutions with over 50 years of automotive qualification expertise.
The SN74AC245DGSRQ1 belongs to TI's automotive-qualified AC logic family, designed specifically for noise-immune, high-reliability data routing in vehicle electronic control units operating under harsh thermal and EMI conditions.
FAQ
What is the maximum continuous output current supported by the SN74AC245DGSRQ1 at 5V?
The SN74AC245DGSRQ1 supports ±24mA continuous output current at 5V supply, as specified in Section 5.3 Recommended Operating Conditions of the TI SCLS971B datasheet. This rating applies across the full −40°C to +125°C operating range and ensures stable VOH ≥ 3.7V and VOL ≤ 0.5V under sustained load. Short-burst operation up to ±75mA is permitted but not intended for continuous duty.
Does the SN74AC245DGSRQ1 support 1.8V logic interfacing?
Yes, the SN74AC245DGSRQ1 fully supports 1.8V operation: VIH(min) = 1.26V and VIL(max) = 0.54V at VCC = 1.8V (Section 5.3), and it delivers 1.53V VOH at −24mA load. Its 1.5V–6V supply range and 6V-tolerant inputs allow seamless interfacing with 1.8V microcontrollers while driving 3.3V or 5V peripherals - no external level shifters required.
How does the DIR and OE pin interaction determine data flow direction in the SN74AC245DGSRQ1?
In the SN74AC245DGSRQ1, OE must be LOW to enable any output; when OE is HIGH, all outputs enter high-impedance regardless of DIR state. With OE LOW, DIR = LOW enables B→A data flow (B inputs appear at A outputs), and DIR = HIGH enables A→B flow (A inputs appear at B outputs). This two-pin control scheme is defined in Table 7-1 Function Table of the datasheet.
Is the thermal pad on the SN74AC245DGSRQ1 RKS package required to be connected to ground?
The thermal pad on the SN74AC245DGSRQ1 RKS package may be connected to GND or left floating per TI's mechanical guidelines (Section 4 Pin Configuration), but TI recommends connecting it to the PCB ground plane. Doing so improves thermal dissipation (reducing RθJA by ~25°C/W vs. unconnected pad) and provides EMI shielding - both critical for automotive ECU reliability and EMC compliance.
Can the SN74AC245DGSRQ1 drive a 50Ω transmission line directly without series termination?
Yes, the SN74AC245DGSRQ1 is explicitly characterized to drive 50Ω transmission lines (Section 1 Features), with output drive strength and edge rates engineered to minimize reflections. At 5V supply, its typical output impedance is ~15Ω, allowing effective damping when paired with a small series resistor (e.g., 10–22Ω) near the driver - sufficient for most automotive PCB trace lengths under 15 cm without additional termination.
SN74AC245DGSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-TFSOP (0.118", 3.00mm 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:
- 1.5V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74AC245DGSRQ1 FAQ
1.How can I place an order for SN74AC245DGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245DGSRQ1 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 SN74AC245DGSRQ1 reliable?
The price and inventory of SN74AC245DGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245DGSRQ1 is usually 5 days.
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4.How is shipping managed for SN74AC245DGSRQ1?
SN74AC245DGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245DGSRQ1 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 SN74AC245DGSRQ1?
For technical support, including SN74AC245DGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245DGSRQ1 requirements.
6.How does Aetrix verify that SN74AC245DGSRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AC245DGSRQ1 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 SN74AC245DGSRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AC245DGSRQ1?
All SN74AC245DGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245DGSRQ1, 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 SN74AC245DGSRQ1 part is unused and in its original packaging.
Return procedure for SN74AC245DGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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