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Texas Instruments SN74AHCT244QDWRQ1
- Part No.:
- SN74AHCT244QDWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT244QDWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
SN74AHCT244QDWRQ1 from Texas Instruments is an automotive-qualified octal buffer/driver with 3-state outputs, designed for bus-oriented receivers and transmitters in memory-address and clock driver applications. It features TTL-compatible inputs, ±8 mA output drive at 5 V, 7.4 ns typical propagation delay (CL = 15 pF), and operates from −40°C to +125°C.
For engineers reviewing the SN74AHCT244QDWRQ1 datasheet, SN74AHCT244QDWRQ1 pinout, SN74AHCT244QDWRQ1 application, or SN74AHCT244QDWRQ1 equivalent, key selection criteria include automotive AEC-Q100 qualification, dual 4-bit independent 3-state control, SOIC-20 package compatibility, and robust noise immunity in noisy vehicle subsystems.
Technical Context
The SN74AHCT244QDWRQ1 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated output-enable input (1OE and 2OE). Its EPIC™ CMOS process ensures TTL-level input compatibility while maintaining CMOS power efficiency and noise margins.
Each buffer section drives up to eight LSTTL loads, supports high-impedance state during power-up/down when OE is pulled high via external resistor, and delivers rail-to-rail output swing (VOH ≥ 3.94 V, VOL ≤ 0.44 V at IOL = 8 mA) under recommended 4.5–5.5 V supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across automotive battery voltage fluctuations including cold-crank conditions. |
| Output Drive | ±8 mA - Sufficient to directly drive standard LSTTL loads without external buffering in CAN/LIN interface backplanes or sensor data buses. |
| Propagation Delay | 7.4 ns (typical, CL = 15 pF) - Enables reliable timing in 20–25 MHz address/data strobe paths for microcontroller peripheral expansion. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Interoperates seamlessly with legacy 5 V logic families without level-shifting circuitry. |
| Operating Temperature | −40°C to +125°C - Qualified per AEC-Q100 Grade 1 for engine control units, body electronics, and ADAS domain controllers. |
| ESD Rating | ±1000 V HBM - Meets automotive ESD robustness requirements for assembly and field reliability in harsh environments. |
| Quiescent Current | 40 μA (max, ICC at VCC = 5.5 V) - Supports low-power wake-up monitoring in always-on vehicle networks. |
Pinout & Package
SN74AHCT244QDWRQ1 is supplied in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), with 1.27 mm pitch and JEDEC MS-013 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for respective 4-bit sections - enables independent bus arbitration and signal gating. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered input channels - accepts TTL-compatible signals from microcontrollers, sensors, or switches. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state outputs - provides bidirectional bus isolation and prevents contention on shared data/address lines. |
| 10 | GND | Ground reference - must be connected to low-impedance chassis or system ground plane to maintain noise immunity. |
| 20 | VCC | Power supply input - requires local 0.1 μF ceramic bypass capacitor placed within 3 mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (−40°C to +125°C) - certified for safety-critical automotive subsystems including powertrain and chassis control. |
| Dual independent 3-state control | Separate 1OE and 2OE pins - allows selective enabling of two 4-bit data lanes for multiplexed sensor readout or display driver sequencing. |
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - eliminates need for external level shifters when interfacing with legacy 5 V MCU GPIO or discrete logic. |
| High noise immunity | ΔVOL/ΔVIH = 0.4 V margin - suppresses false triggering from EMI in engine bay or infotainment harnesses. |
| Low quiescent current | 40 μA max at 5.5 V - reduces standby power in always-on gateway modules without compromising wake-up latency. |
Applications
| Engine Control Unit (ECU) Address Buffering | Body Control Module (BCM) Switch Debouncing |
|---|---|
|
Use Scenario: Isolating microcontroller address lines from high-capacitance EEPROM and flash memory buses in engine management systems. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fan-out capability and bus contention prevention during memory write cycles. Use Value: Enables clean 25 MHz address strobing with <8.5 ns propagation delay and eliminates signal integrity degradation from trace capacitance. |
Use Scenario: Conditioning mechanical switch inputs (e.g., door lock actuators, lighting controls) before routing to MCU GPIO. IC Role / Device Role / Timing Role: Input conditioning buffer with high-impedance disable state used during controller reset sequences. Use Value: Removes contact bounce artifacts using TTL-compatible thresholds and holds valid logic levels during 100 ms reset windows. |
| ADAS Camera Interface Signal Routing | Infotainment Display Data Multiplexing |
|
Use Scenario: Routing parallel pixel data from image sensors to SoC video processors in surround-view camera systems. IC Role / Device Role / Timing Role: Octal driver isolating sensor-side data lines from processor-side bus loading and crosstalk. Use Value: Delivers 8 mA drive strength to meet setup/hold timing across 15 cm flex PCB traces while maintaining <1 ns skew between lanes. |
Use Scenario: Time-multiplexing RGB data streams from multiple display panels (e.g., instrument cluster + center console) onto shared LVDS transmitter inputs. IC Role / Device Role / Timing Role: Dual-section buffer enabling time-sliced data forwarding with independent OE control per panel. Use Value: Reduces BOM count by replacing two discrete 4-bit buffers and supports seamless panel switching with zero bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/3-state driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT244QPWRQ1 | TSSOP-20 (6.5 mm × 6.4 mm), lower thermal resistance (RθJA = 116.8°C/W vs. 58°C/W), same electrical specs. | Better suited for space-constrained PCBs but requires tighter layout control for thermal management in high-ambient zones. | Select when board area is constrained and thermal derating can be managed via copper pour or airflow. |
| SN74LVC244AQPWRQ1 | 3.3 V only (1.65–3.6 V), higher speed (tPD = 4.2 ns), lower drive (±24 mA), different input thresholds (VIH = 2.0 V @ VCC = 3.3 V). | Requires level translation for 5 V systems; optimized for low-voltage MCU interfaces like automotive infotainment SoCs. | Choose only for new 3.3 V designs where power savings and speed outweigh compatibility with existing 5 V peripherals. |
Compared with SN74AHCT244QPWRQ1 and SN74LVC244AQPWRQ1, the SN74AHCT244QDWRQ1 offers superior thermal performance in SOIC packaging and native 5 V interoperability-critical for legacy automotive ECUs and mixed-voltage gateways where level shifters add cost and failure modes.
Availability
SN74AHCT244QDWRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT244QDWRQ1 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 over 50 years of automotive qualification expertise and AEC-Q100-compliant manufacturing.
The SN74AHCT244QDWRQ1 belongs to TI's automotive logic portfolio, engineered specifically for noise-immune signal buffering in vehicle subsystems where reliability, temperature resilience, and direct TTL interfacing are mandatory.
FAQ
What is the operating temperature range for SN74AHCT244QDWRQ1?
The SN74AHCT244QDWRQ1 is rated for −40°C to +125°C, meeting AEC-Q100 Grade 1 requirements. This range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and input thresholds, ensuring consistent behavior in under-hood and cabin-mounted automotive electronics.
Does SN74AHCT244QDWRQ1 support 3.3 V logic inputs?
No. The SN74AHCT244QDWRQ1 requires 4.5–5.5 V supply and is designed for TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V). While it may function with 3.3 V inputs in some cases, TI does not guarantee performance outside the specified 5 V operating conditions, and marginal operation risks timing violations or increased static current.
How should unused inputs be handled on SN74AHCT244QDWRQ1?
All unused inputs on SN74AHCT244QDWRQ1 must be tied to VCC or GND to prevent floating states that cause excessive current draw or undefined outputs. TI recommends connecting unused A inputs to GND and unused OE inputs to VCC through a pull-up resistor to ensure predictable high-impedance behavior during power transitions.
Is SN74AHCT244QDWRQ1 pin-compatible with commercial-grade SN74AHCT244?
Yes - SN74AHCT244QDWRQ1 shares identical pinout, electrical characteristics, and functional behavior with the commercial SN74AHCT244 in SOIC-20 (DW) packaging. The Q1 suffix denotes automotive qualification (AEC-Q100), enhanced testing, and extended temperature validation, with no physical or logical differences in pin assignment or operation.
What is the maximum capacitive load SN74AHCT244QDWRQ1 can drive reliably?
The SN74AHCT244QDWRQ1 is characterized up to 50 pF load capacitance, with tPLH/tPHL = 9.5 ns (max) and tPZH/tPZL = 13 ns (max) at VCC = 5 V. Driving >50 pF increases propagation delay nonlinearly and may violate setup/hold timing in high-speed buses; for heavier loads, consider adding series termination or selecting a higher-drive buffer.
SN74AHCT244QDWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 8mA, 8mA
- 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-SOIC
SN74AHCT244QDWRQ1 FAQ
1.How can I place an order for SN74AHCT244QDWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244QDWRQ1 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 SN74AHCT244QDWRQ1 reliable?
The price and inventory of SN74AHCT244QDWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244QDWRQ1 is usually 5 days.
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SN74AHCT244QDWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244QDWRQ1 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 SN74AHCT244QDWRQ1?
For technical support, including SN74AHCT244QDWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244QDWRQ1 requirements.
6.How does Aetrix verify that SN74AHCT244QDWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244QDWRQ1 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 SN74AHCT244QDWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244QDWRQ1?
All SN74AHCT244QDWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244QDWRQ1, 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 SN74AHCT244QDWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT244QDWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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