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Texas Instruments SN74ACT244QDGSRQ1
- Part No.:
- SN74ACT244QDGSRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74ACT244QDGSRQ1.pdf
- Description:
- AUTOMOTIVE EIGHT-CHANNEL 4.5-V T
- Quantity:
- Payment:
- Shipping:
Inventory:5,441
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Product details
Overview
SN74ACT244QDGSRQ1 from Texas Instruments is an automotive-qualified octal 3-state buffer/driver IC with dual independent output-enable controls, operating at 4.5V–5.5V VCC, supporting TTL-compatible inputs up to 5.5V, and delivering ≤9ns propagation delay at 5V. It enables bidirectional bus isolation and signal redriving in engine control units and body electronics.
For engineers reviewing the SN74ACT244QDGSRQ1 datasheet, SN74ACT244QDGSRQ1 pinout, SN74ACT244QDGSRQ1 application, or SN74ACT244QDGSRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (−40°C to +125°C), VSSOP-20 package thermal performance (RθJA = 123.5°C/W), 24mA output drive capability, and dual OE-controlled 4-bit channel segmentation.
Technical Context
The SN74ACT244QDGSRQ1 implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) input. Each section passes data from A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high. This architecture supports dynamic bus contention avoidance and controlled signal gating in multi-master systems.
It uses ACT (Advanced CMOS TTL-compatible) logic family technology, ensuring compatibility with legacy TTL voltage thresholds while delivering CMOS power efficiency. Input tolerance to 5.5V allows interfacing with higher-voltage peripherals without level-shifting, and the 24mA IOL/IOH rating supports direct LED driving and transmission-line termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures stable operation across automotive battery transients and regulator tolerances. |
| Propagation Delay (tPD) | ≤9ns at 5V - Enables reliable timing in high-speed digital subsystems such as CAN gateway signal conditioning. |
| Output Drive (IOL/IOH) | ±24mA - Sufficient to directly drive LEDs, 50Ω transmission lines, or multiple CMOS/TTL loads without external buffers. |
| Input Voltage Tolerance | Up to 5.5V - Permits safe interfacing with 5V peripherals even when VCC is at minimum 4.5V. |
| Operating Temperature | −40°C to +125°C - Qualified per AEC-Q100 Grade 1 for under-hood and powertrain applications. |
| ESD Rating (HBM) | ±2000V - Meets automotive ESD robustness requirements for assembly and field reliability. |
| Power Dissipation Cap. (Cpd) | 45pF per buffer - Predictable dynamic power consumption for thermal modeling in dense PCB layouts. |
Pinout & Package
VSSOP-20 (DGS) package: 5.1mm × 4.9mm footprint, 1.1mm max height, exposed thermal pad for enhanced heat dissipation in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Active-Low Output Enable (Group 1 & 2) | Independent control of two 4-bit channels; tie to VCC via pullup for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4 | Buffer Inputs (Two Groups) | Noninverting data inputs; TTL-compatible thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V). |
| 1Y1–1Y4, 2Y1–2Y4 | Buffer Outputs (Two Groups) | 3-state outputs capable of sinking/sourcing 24mA; high-Z when respective OE is high. |
| VCC (Pin 20) | Power Supply | Single 4.5–5.5V rail; requires local 0.1µF bypass capacitor adjacent to pin. |
| GND (Pin 10) | Ground Reference | Common return for all logic and output current paths; critical for noise immunity in mixed-signal environments. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (−40°C to +125°C ambient), certified for automotive powertrain and chassis systems. |
| Dual Independent OE Control | Enables selective activation of two 4-bit channels-ideal for multiplexed bus arbitration or phased reset sequencing. |
| TTL-Compatible Inputs | Accepts standard 5V TTL logic levels regardless of VCC within spec, simplifying integration with legacy controllers. |
| High-Speed Switching | 9ns max tPD and <10ns max tPZH/tPLZ support clean signal integrity on 25MHz+ buses. |
| VSSOP Thermal Performance | RθJA = 123.5°C/W enables >150mW continuous power dissipation in compact under-hood layouts. |
Applications
| Engine Control Unit (ECU) Signal Conditioning | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Redriving sensor interface signals (e.g., crankshaft position, camshaft timing) before routing to MCU inputs. IC Role / Device Role / Timing Role: Octal buffer isolating noisy analog front-end circuitry from digital processing domain while preserving edge timing. Use Value: 9ns propagation delay ensures sub-microsecond timing fidelity critical for ignition timing accuracy and misfire detection. |
Use Scenario: Driving indicator LEDs (e.g., door-open, seatbelt, hazard status) directly from microcontroller GPIOs. IC Role / Device Role / Timing Role: High-current buffer translating low-drive MCU outputs into 20mA LED drive capability. Use Value: ±24mA output current eliminates need for discrete transistor stages, reducing BOM count and board area in cost-sensitive BCMs. |
| Automotive CAN Gateway Interface | Transmission Line Driver for LIN Bus |
|
Use Scenario: Isolating and buffering CAN controller TX/RX lines between microcontroller and physical transceiver. IC Role / Device Role / Timing Role: 3-state bus driver enabling dynamic direction control and preventing bus contention during MCU reset sequences. Use Value: Dual OE pins allow independent gating of TX and RX paths, supporting fail-safe bus hold during firmware updates. |
Use Scenario: Driving LIN bus signals over 20m+ wiring harnesses with minimal overshoot/ringing. IC Role / Device Role / Timing Role: Controlled-impedance line driver with fast edge rates (<10ns) and 24mA drive strength. Use Value: Low output capacitance (8pF) and tight tPLH/tPHL matching ensure compliant LIN physical layer signaling at 19.2kbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244AQPWRQ1 | Lower VCC range (1.65–5.5V), 3.3V-optimized, 16ns tPD at 3.3V, ±24mA drive | Better suited for mixed-voltage domains with 3.3V MCUs; not recommended for 5V-only legacy systems | Select when migrating to lower-power 3.3V architectures or requiring wider supply flexibility. |
| SN74AHCT244QPWRQ1 | Same 4.5–5.5V range, 8.5ns tPD, ±8mA drive, higher ICC (40µA typical) | Compatible pinout but reduced drive strength limits use in LED/transmission-line applications | Choose only if strict 5V-only operation is required and load current ≤8mA; verify thermal margin. |
Compared with SN74ACT244QDGSRQ1, SN74LVC244AQPWRQ1 offers broader voltage support but slower speed at 5V, while SN74AHCT244QPWRQ1 matches supply range and speed but lacks sufficient drive for direct LED or 50Ω line loading-making SN74ACT244QDGSRQ1 optimal for high-integrity 5V automotive signal conditioning.
Availability
SN74ACT244QDGSRQ1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and automotive gateway designs requiring stable component supply, AEC-Q100 compliance, and VSSOP-20 thermal performance.
Supply support for SN74ACT244QDGSRQ1 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 ICs, with decades of experience in high-reliability automotive electronics.
The SN74ACT244QDGSRQ1 belongs to TI's automotive logic portfolio, designed specifically for signal integrity, bus isolation, and redriving in harsh-temperature vehicle subsystems where timing precision and fault resilience are critical.
FAQ
What is the maximum operating temperature for SN74ACT244QDGSRQ1?
The SN74ACT244QDGSRQ1 is qualified per AEC-Q100 Grade 1 with an operating free-air temperature range of −40°C to +125°C. This rating applies specifically to the DGS (VSSOP-20) package variant and is validated across process corners and voltage extremes per TI's automotive qualification protocol.
Does SN74ACT244QDGSRQ1 support 3.3V logic inputs?
Yes, SN74ACT244QDGSRQ1 accepts 3.3V logic inputs reliably because its input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V) are TTL-compatible and independent of VCC. When powered at 5V, it correctly interprets 3.3V-high signals as valid logic high, enabling seamless interfacing with mixed-voltage systems.
Can SN74ACT244QDGSRQ1 drive a 50Ω transmission line directly?
Yes, SN74ACT244QDGSRQ1 can drive a 50Ω transmission line directly: its 24mA output sink/source capability provides adequate current for 5V logic-level signaling into 50Ω, and its 9ns propagation delay ensures minimal skew across all eight channels-critical for parallel bus integrity in automotive gateways.
Is the thermal pad on the DGS package of SN74ACT244QDGSRQ1 electrically connected?
No, the exposed thermal pad on the SN74ACT244QDGSRQ1 DGS package is not electrically connected to any internal node-it is a mechanical thermal enhancement feature only. TI recommends soldering it to a PCB thermal plane for optimal heat dissipation but does not require electrical connection to GND or VCC.
What is the recommended bypass capacitor for SN74ACT244QDGSRQ1?
Texas Instruments specifies a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 20) of SN74ACT244QDGSRQ1. This value is validated for noise suppression across the 4.5–5.5V operating range and complements the device's 45pF power-dissipation capacitance for stable high-speed switching.
SN74ACT244QDGSRQ1 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:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74ACT244QDGSRQ1 FAQ
1.How can I place an order for SN74ACT244QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244QDGSRQ1 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 SN74ACT244QDGSRQ1 reliable?
The price and inventory of SN74ACT244QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244QDGSRQ1 is usually 5 days.
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SN74ACT244QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244QDGSRQ1 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 SN74ACT244QDGSRQ1?
For technical support, including SN74ACT244QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244QDGSRQ1 requirements.
6.How does Aetrix verify that SN74ACT244QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244QDGSRQ1 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 SN74ACT244QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of SN74ACT244QDGSRQ1?
All SN74ACT244QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244QDGSRQ1, 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 SN74ACT244QDGSRQ1 part is unused and in its original packaging.
Return procedure for SN74ACT244QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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