My Inquiry
My Account
Texas Instruments SN74ACT245DGSRQ1
- Part No.:
- SN74ACT245DGSRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74ACT245DGSRQ1.pdf
- Description:
- AUTOMOTIVE OCTAL BUS TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ACT245DGSRQ1 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, 4.5V–5.5V supply operation, ±24mA continuous output drive, and 10ns max propagation delay at 5V/50pF - used for signal redriving and transmission-line interfacing in engine control units and ADAS domain controllers.
For engineers reviewing the SN74ACT245DGSRQ1 datasheet, SN74ACT245DGSRQ1 pinout, SN74ACT245DGSRQ1 application, or SN74ACT245DGSRQ1 equivalent, key selection criteria include automotive temperature range (-40°C to +125°C), wettable-flank VQFN-20 package compatibility with AOI inspection, TTL-compatible input thresholds, and precise 3-state timing behavior under transient load conditions.
Technical Context
The SN74ACT245DGSRQ1 implements eight independent bidirectional CMOS transceivers sharing a single direction (DIR) and active-low output enable (OE) control. Its balanced push-pull outputs support symmetrical sourcing/sinking up to ±24mA continuously and ±75mA in short bursts, enabling robust driving of 50Ω transmission lines without external termination.
Each channel operates in one of three functional states per Table 7-1: A→B pass-through (DIR=H, OE=L), B→A pass-through (DIR=L, OE=L), or full 3-state high-impedance (OE=H). Input transition rate must be ≤20 ns/V to prevent oscillation, and unused inputs require termination to VCC or GND to maintain deterministic logic states.
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. |
| Propagation Delay | ≤10ns at VCC=5V, CL=50pF - enables reliable timing in high-speed digital buses up to ~50MHz clock-equivalent rates. |
| Output Drive | ±24mA continuous, ±75mA pulsed - supports direct connection to LED indicators, microcontroller GPIOs, and 50Ω PCB traces without external buffers. |
| Input Thresholds | VIL ≤0.8V, VIH ≥2.0V - guarantees interoperability with legacy TTL and 5V CMOS logic families without level-shifting. |
| Operating Temperature | -40°C to +125°C (Grade 1) - qualified for under-hood and powertrain applications per AEC-Q100 requirements. |
| ESD Rating | HBM ±2000V, CDM ±1000V - meets automotive ESD immunity standards for assembly and field reliability. |
| Thermal Resistance | RθJA = 66.5°C/W (RKS package) - enables operation at full drive strength without heatsink in ambient temperatures up to 125°C. |
Pinout & Package
SN74ACT245DGSRQ1 is packaged in a 20-pin wettable-flank VQFN (RKS) with 4.5mm × 2.5mm body size and exposed thermal pad. The package supports automated optical inspection (AOI) via side-fillet solder joints and allows thermal pad connection to GND or floating configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time signal path for all eight channels. |
| OE (Pin 19) | Active-low output enable | Low = outputs enabled per DIR state; High = all outputs forced to high-impedance - critical for bus arbitration and power sequencing. |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data interface on side A - connected to microcontroller or ASIC data bus; must be terminated if unused. |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data interface on side B - routed to peripheral ICs or connectors; supports parallel connection for increased drive strength. |
| VCC (Pin 20) | Positive supply | 4.5V–5.5V main power rail - requires local 0.1μF bypass capacitor placed adjacent to pin for noise suppression. |
| GND (Pin 10) | Ground reference | Return path for all I/O and supply currents - must connect to low-impedance system ground plane to limit ground bounce. |
| Thermal Pad | Thermal and electrical reference | Exposed copper pad beneath package - improves thermal dissipation and may be tied to GND for EMI reduction or left floating per layout constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40°C to +125°C ambient, supporting engine control, transmission, and ADAS modules without derating. |
| Wettable-flank VQFN package | Enables reliable AOI-based solder-joint inspection on production lines, reducing field failure risk in safety-critical systems. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels (VIH ≥2.0V, VIL ≤0.8V), eliminating need for external level shifters when interfacing with legacy components. |
| Balanced CMOS 3-state outputs | Sources and sinks equal current (±24mA), ensuring consistent rise/fall times and minimizing signal skew across all eight channels. |
| Fast 10ns propagation delay | Meets timing budgets for high-speed interconnects in CAN FD gateways and sensor fusion hubs operating near 50MHz data rates. |
Applications
| Engine Control Unit (ECU) Signal Redrive | ADAS Camera Interface Buffer |
|---|---|
Use Scenario: Isolating and strengthening SPI or parallel sensor data signals between MCU and high-noise powertrain peripherals. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing galvanic isolation-free level restoration and drive strength augmentation during ECU boot and runtime. Use Value: Eliminates signal degradation over 15cm+ PCB traces while maintaining <10ns timing margin for time-critical ignition timing commands. | Use Scenario: Driving serialized image data from camera module to SoC across flex-rigid PCB sections with impedance discontinuities. IC Role / Device Role / Timing Role: Transmission-line driver with matched 50Ω output capability and fast edge control to suppress ringing in MIPI CSI-2 auxiliary lanes. Use Value: Enables clean 100Mbps pixel clock distribution without external series resistors, reducing BOM count and layout complexity. |
| Automotive Infotainment Display Bus | Body Control Module (BCM) LED Driver Hub |
Use Scenario: Extending parallel RGB or LVDS control signals from head unit processor to dashboard display panel with long trace runs. IC Role / Device Role / Timing Role: Octal redriver managing simultaneous data flow direction switching during display mode transitions (e.g., video vs. touch feedback). Use Value: Maintains sub-5ns inter-channel skew across all eight data lines, preventing color banding artifacts in 1080p displays. | Use Scenario: Multiplexing discrete LED status indicators (e.g., door open, seatbelt, hazard) driven by low-current MCU GPIOs. IC Role / Device Role / Timing Role: Current-boosting transceiver converting 4mA MCU outputs into 24mA sink/source capable of directly driving 20mA LEDs. Use Value: Removes need for discrete transistor arrays, cutting board space by 35% and simplifying thermal management in confined BCM enclosures. |
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), 3.3V-only operation, 6.7ns max tpd, ±24mA drive | Targeted for 3.3V ADAS SoCs and infotainment subsystems; not suitable for 5V legacy engine ECUs | Select when system uses 3.3V logic rails and requires lower static power (ICC = 10µA typical) |
| MC74VHC245DTG | Non-automotive grade, -55°C to +125°C industrial temp range, no AEC-Q100 qualification, 7.5ns tpd | Applicable in non-safety-critical industrial controls or test equipment where automotive qualification is unnecessary | Choose only for cost-sensitive non-automotive designs requiring identical pinout but lacking vehicle-grade reliability validation |
Compared with SN74LVC245AQPWRQ1 and MC74VHC245DTG, the SN74ACT245DGSRQ1 uniquely supports 5V automotive systems with AEC-Q100 Grade 1 compliance, making it the sole option for legacy 5V ECU redesigns requiring drop-in replacement and full temperature-range validation.
Availability
SN74ACT245DGSRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera interfaces, infotainment display buses, and body control module LED drivers requiring stable component supply across extended automotive product lifecycles.
Supply support for SN74ACT245DGSRQ1 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, industrial, and power management solutions.
The SN74ACT245DGSRQ1 belongs to TI's automotive logic portfolio, designed specifically to replace legacy 74-series transceivers in safety-critical vehicle systems while meeting AEC-Q100 stress-test requirements and zero-defect manufacturing standards.
FAQ
What is the maximum continuous output current rating for SN74ACT245DGSRQ1?
The SN74ACT245DGSRQ1 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 -40°C to +125°C operating temperature range and enables direct driving of 50Ω transmission lines and indicator LEDs without external buffering. Exceeding this value risks thermal overload and parametric shift.
Does SN74ACT245DGSRQ1 support 3.3V logic interfaces?
No, SN74ACT245DGSRQ1 does not support 3.3V logic interfaces. Its recommended operating supply voltage is strictly 4.5V to 5.5V, and its TTL-compatible input thresholds (VIH ≥2.0V, VIL ≤0.8V) are optimized for 5V systems. Connecting 3.3V logic signals directly may result in marginal or invalid logic recognition, especially at temperature extremes. For 3.3V applications, consider SN74LVC245AQPWRQ1 instead.
How should the thermal pad on the SN74ACT245DGSRQ1 RKS package be connected?
The thermal pad on the SN74ACT245DGSRQ1 RKS package can be connected to GND or left electrically floating, as stated in Table 4-1. TI recommends connecting it to GND to improve thermal dissipation and reduce EMI, but it must never be connected to VCC or any signal net. Solder mask-defined stencil openings and proper reflow profile ensure reliable solder joint formation for AOI-verified side fillets.
What happens to SN74ACT245DGSRQ1 outputs during power-up if OE is uncontrolled?
If OE is left uncontrolled during power-up, SN74ACT245DGSRQ1 outputs may enter undefined states, risking bus contention or glitching. TI recommends tying OE to VCC via a 10kΩ pull-up resistor to force all outputs into high-impedance until system firmware actively drives OE low. This prevents unintended data flow before initialization completes and avoids violating absolute maximum ratings on connected devices.
Can multiple SN74ACT245DGSRQ1 channels be paralleled for higher drive strength?
Yes, two or more channels of the same SN74ACT245DGSRQ1 can be paralleled on either Port A or Port B to increase total output drive strength - for example, combining A1 and A2 to source/sink up to ±48mA. This is explicitly supported in Section 8.3.3 Output Considerations. Ensure identical signal routing, matched trace lengths, and shared DIR/OE control to avoid skew or shoot-through conditions.
SN74ACT245DGSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74ACT245DGSRQ1 FAQ
1.How can I place an order for SN74ACT245DGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT245DGSRQ1 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 SN74ACT245DGSRQ1 reliable?
The price and inventory of SN74ACT245DGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT245DGSRQ1 is usually 5 days.
3.What payment methods are accepted for SN74ACT245DGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT245DGSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT245DGSRQ1?
SN74ACT245DGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT245DGSRQ1 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 SN74ACT245DGSRQ1?
For technical support, including SN74ACT245DGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT245DGSRQ1 requirements.
6.How does Aetrix verify that SN74ACT245DGSRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74ACT245DGSRQ1 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 SN74ACT245DGSRQ1 meets industry standards.
7.What is the process for return or replacement of SN74ACT245DGSRQ1?
All SN74ACT245DGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT245DGSRQ1, 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 SN74ACT245DGSRQ1 part is unused and in its original packaging.
Return procedure for SN74ACT245DGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT245DGSRQ1 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
