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Texas Instruments SN74AC244QDGSRQ1
- Part No.:
- SN74AC244QDGSRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74AC244QDGSRQ1.pdf
- Description:
- AUTOMOTIVE EIGHT-CHANNEL 2-V TO
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SN74AC244QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal buffer/driver with Schmitt-trigger inputs and dual 4-channel 3-state outputs, operating from 1.5V to 6V supply, delivering ≤6.8ns propagation delay at 5V, ±24mA continuous output drive, and supporting 50Ω transmission line driving for signal integrity in vehicle control modules.
For engineers reviewing the SN74AC244QDGSRQ1 datasheet, SN74AC244QDGSRQ1 pinout, SN74AC244QDGSRQ1 application, or SN74AC244QDGSRQ1 equivalent, key selection criteria include its dual-bank 3-state control architecture, wettable-flank VQFN-20 (RKS) packaging for automotive AOI, Schmitt-trigger noise immunity, and guaranteed operation across –40°C to +125°C.
Technical Context
The SN74AC244QDGSRQ1 implements two independent banks of four CMOS buffers, each bank controlled by a dedicated active-low output enable (1OE/2OE), enabling selective bus isolation. Its Schmitt-trigger inputs provide hysteresis (typical ΔV = 0.3–0.5V depending on VCC) to reject slow-rising or noisy signals without external debouncing.
Each output supports balanced sourcing/sinking up to ±24mA continuously at 5V, with short-burst capability up to ±75mA, and drives 50Ω transmission lines directly-enabling clean edge delivery into PCB traces >12 cm without external termination resistors in typical automotive signal routing.
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 level shifters |
| Propagation Delay (tpd) | ≤6.8ns at 5V - ensures timing compliance in high-speed automotive data paths (e.g., sensor multiplexing, ECU diagnostics) |
| Output Drive (IOH/IOL) | ±24mA continuous at 5V - sufficient to drive multiple CMOS loads or terminate 50Ω lines without fanout degradation |
| Input Hysteresis | Schmitt-trigger inputs with ~0.4V typical hysteresis at 5V - rejects noise on long harness-connected signals (e.g., switch inputs, sensor lines) |
| Operating Temperature | –40°C to +125°C (Grade 1) - qualified for under-hood and powertrain applications per AEC-Q100 |
| ESD Rating | HBM ±2000V, CDM ±1000V - meets automotive system-level ESD robustness requirements |
| Package | VQFN-20 (RKS), 4.5mm × 2.5mm with wettable flanks - supports automated optical inspection and high-reliability reflow in automotive PCB assembly |
Pinout & Package
VQFN-20 (RKS) package with 4.5mm × 2.5mm body size, thermal pad (connected to GND or floating), and wettable flanks for AOI-compatible solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low bank enable inputs | Independent control of Bank 1 (pins 2,4,6,8 → 18,16,14,12) and Bank 2 (pins 11,13,15,17 → 3,5,7,9); critical for dynamic bus arbitration |
| 1A1–1A4, 2A1–2A4 | Buffer input terminals | Eight single-ended digital inputs; Schmitt-triggered to tolerate slow/noisy signals from switches or sensors |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffer outputs | High-impedance state when OE = HIGH eliminates bus contention; outputs drive 50Ω lines directly |
| VCC (Pin 20), GND (Pin 10) | Power supply terminals | Single-supply operation; thermal pad improves thermal resistance (RθJB = 40.4°C/W) for sustained 24mA loading |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-channel banks | Enables selective isolation of two signal groups (e.g., CAN transceiver control + sensor data bus) using separate OE pins |
| Schmitt-trigger inputs | Rejects noise on long-wire automotive signals (e.g., door switch, brake pedal) without external RC filtering |
| Wettable-flank QFN (RKS) | Ensures reliable solder joint inspection via AOI in high-volume automotive manufacturing |
| 50Ω transmission line drive | Eliminates need for series termination resistors in >12 cm trace applications (e.g., body control module interconnects) |
| 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 Signal Routing | Engine Control Unit I/O Expansion |
|---|---|
Use Scenario: Isolating and buffering signals between microcontroller GPIOs and distributed body electronics (e.g., mirror controls, seat position sensors). IC Role / Device Role / Timing Role: Octal buffer with dual 3-state control acts as bidirectional signal conditioner and bus isolator. Use Value: Schmitt-trigger inputs suppress harness-induced noise; 3-state outputs prevent contention during MCU reset sequences. | Use Scenario: Expanding digital I/O capability of engine ECU to interface with additional solenoid drivers or diagnostic LEDs. IC Role / Device Role / Timing Role: Level-shifting buffer enabling 3.3V MCU to drive 5V-compatible loads with precise timing. Use Value: ≤6.8ns tpd ensures deterministic response in real-time actuator control loops; ±24mA drive sustains LED brightness without external drivers. |
| Automotive Infotainment Switch Debounce | ADAS Camera Interface Signal Conditioning |
Use Scenario: Cleaning mechanical switch inputs (e.g., HVAC panel buttons) before feeding to infotainment SoC GPIOs. IC Role / Device Role / Timing Role: Noise-immune buffer converting slow, bouncing switch transitions into clean digital edges. Use Value: Built-in Schmitt hysteresis replaces discrete RC+Schmitt circuits, reducing BOM count and PCB area in space-constrained head units. | Use Scenario: Driving parallel clock/data lines from camera sensor to image processor over 15cm flex PCB traces. IC Role / Device Role / Timing Role: Transmission-line driver maintaining signal integrity on high-speed parallel video interfaces. Use Value: Direct 50Ω drive capability eliminates series resistors, preserving edge rate and minimizing jitter in pixel clock distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244AQDRQ1 | Lower drive (±24mA @ 3.3V only), no Schmitt inputs, 1.65–3.6V range | Not suitable for 5V systems or noisy switch inputs; requires external hysteresis for debouncing | Choose only for 3.3V-only designs where cost is prioritized over noise immunity and voltage flexibility |
| SN74AHC244QPWRQ1 | Higher propagation delay (≤8.5ns @ 5V), same Schmitt inputs and 1.5–6V range, TSSOP-20 package | Larger footprint and no wettable flanks; less suitable for AOI-critical automotive SMT lines | Select when board layout constraints permit TSSOP or when legacy footprint compatibility is required |
Compared with SN74LVC244AQDRQ1, SN74AC244QDGSRQ1 provides broader voltage support and inherent noise rejection; compared with SN74AHC244QPWRQ1, it offers superior thermal performance and AOI-ready packaging for high-reliability automotive production.
Availability
SN74AC244QDGSRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, engine control unit I/O expansion, infotainment switch interfaces, ADAS camera signal routing, and transmission control systems requiring stable component supply across extended temperature ranges.
Supply support for SN74AC244QDGSRQ1 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 decades of automotive qualification expertise.
The SN74AC244QDGSRQ1 belongs to TI's automotive-qualified AC logic family, designed specifically for noise-immune signal buffering and bus isolation in harsh-temperature vehicle subsystems.
FAQ
What is the maximum continuous output current rating for SN74AC244QDGSRQ1 at 5V?
The SN74AC244QDGSRQ1 supports ±24mA continuous output current per channel at 5V supply, as specified in the Recommended Operating Conditions table. This rating ensures reliable drive into standard CMOS loads and 50Ω transmission lines without thermal derating across the full –40°C to +125°C operating range. Short-burst capability extends to ±75mA, but sustained operation must remain within the ±24mA limit to maintain device reliability.
Does SN74AC244QDGSRQ1 support 1.8V logic levels?
Yes, SN74AC244QDGSRQ1 operates down to 1.5V supply and fully supports 1.8V logic levels. At 1.8V, it delivers ≤12.0ns typical propagation delay, VIH(min) = 1.26V, and VIL(max) = 0.54V - ensuring robust interfacing with 1.8V microcontrollers and FPGAs. Input voltage tolerance up to 6V allows mixed-voltage system integration without level shifters.
How does the Schmitt-trigger input benefit automotive applications using SN74AC244QDGSRQ1?
The Schmitt-trigger inputs on SN74AC244QDGSRQ1 provide built-in hysteresis (~0.4V at 5V), enabling reliable detection of slow-rising or electrically noisy signals common in automotive environments - such as mechanical switch closures, potentiometer wiper outputs, or long-harness sensor lines. This eliminates the need for external RC filters or dedicated Schmitt buffers, reducing component count and improving system-level EMI resilience.
What is the purpose of the thermal pad in the RKS package of SN74AC244QDGSRQ1?
The exposed thermal pad in the SN74AC244QDGSRQ1 RKS package serves to lower junction-to-board thermal resistance (RθJB = 40.4°C/W). When soldered to a PCB copper pour connected to GND, it significantly improves heat dissipation during sustained ±24mA output loading - critical for maintaining reliability in under-hood applications where ambient temperatures reach +125°C. The pad may be left floating if thermal constraints are minimal, but grounding is strongly recommended for automotive use.
Can SN74AC244QDGSRQ1 drive 50Ω transmission lines without external series resistors?
Yes, SN74AC244QDGSRQ1 is explicitly characterized to drive 50Ω transmission lines directly, as confirmed in the Features section and Application Information. Its balanced ±24mA output drive at 5V matches the impedance requirement, enabling clean signal edges on traces >12 cm (e.g., in body control or ADAS camera interfaces) without added series termination resistors - simplifying layout and preserving signal rise/fall times.
SN74AC244QDGSRQ1 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:
- 1.5V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74AC244QDGSRQ1 FAQ
1.How can I place an order for SN74AC244QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC244QDGSRQ1 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 SN74AC244QDGSRQ1 reliable?
The price and inventory of SN74AC244QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC244QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AC244QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC244QDGSRQ1 transactions.
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4.How is shipping managed for SN74AC244QDGSRQ1?
SN74AC244QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC244QDGSRQ1 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 SN74AC244QDGSRQ1?
For technical support, including SN74AC244QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC244QDGSRQ1 requirements.
6.How does Aetrix verify that SN74AC244QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AC244QDGSRQ1 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 SN74AC244QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AC244QDGSRQ1?
All SN74AC244QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC244QDGSRQ1, 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 SN74AC244QDGSRQ1 part is unused and in its original packaging.
Return procedure for SN74AC244QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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