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Texas Instruments SN74HC244QDWRQ1
- Part No.:
- SN74HC244QDWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC244QDWRQ1.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,661
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Product details
Overview
SN74HC244QDWRQ1 from Texas Instruments is an automotive-qualified octal buffer and line driver with 3-state outputs, designed for memory address buffering, bus driving, and clock distribution in harsh environments. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, features typical propagation delay of 11 ns, and supports −40°C to +125°C operation.
For engineers reviewing the SN74HC244QDWRQ1 datasheet, SN74HC244QDWRQ1 pinout, SN74HC244QDWRQ1 application, or SN74HC244QDWRQ1 equivalent, key selection criteria include 3-state bus interface capability, automotive AEC-Q100 qualification, SOIC-20 package compatibility, and low ICC (80 μA max) for power-sensitive embedded systems.
Technical Context
The SN74HC244QDWRQ1 implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its CMOS architecture ensures rail-to-rail input thresholds and high noise immunity across the full 2–6 V supply range.
Each buffer passes data from A inputs to Y outputs when OE is low; all eight outputs enter high-impedance state when OE is high. This enables bidirectional bus sharing and eliminates contention in multiplexed memory or peripheral interfaces without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - supports wide-input industrial and automotive power rails including 3.3 V and 5 V systems. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or terminate standard PCB traces without external buffers. |
| Propagation Delay | Typ. 11 ns at 4.5 V - enables reliable operation in high-speed address/data buses up to ~30 MHz. |
| ICC (Max) | 80 μA - ultra-low static current enables use in always-on automotive modules with strict quiescent power budgets. |
| Operating Temp | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
| ESD Rating | >2000 V HBM - exceeds MIL-STD-883 requirements, reducing need for external protection in ECU designs. |
| Input Current | 1 μA max - minimizes loading on upstream logic or sensor signal chains. |
Pinout & Package
SN74HC244QDWRQ1 uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 1.27 mm lead pitch and 2.65 mm max height. Pin 1 index is located in quadrant Q1 per JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-Low Output Enable | Independent controls for Group 1 (pins 2–5, 19–16) and Group 2 (pins 11–14, 8–5) - enables selective bus isolation. |
| 1A1–1A4, 2A1–2A4 | Buffer Inputs | Noninverting data inputs for each 4-bit group - compatible with CMOS, TTL, and microcontroller GPIOs. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffer Outputs | 3-state outputs capable of high-impedance bus release - prevents contention during shared-bus arbitration. |
| VCC (Pin 20), GND (Pin 10) | Power Supply | Dual-supply pins support stable decoupling - requires 0.1 μF ceramic capacitor placed adjacent to VCC/GND. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (−40°C to +125°C) - certified for automotive powertrain, body control, and ADAS modules. |
| 3-State Bus Interface | Two independent OE inputs allow dynamic partitioning of 8-bit data paths - simplifies bus arbitration in multi-master systems. |
| Low Power Consumption | 80 μA max ICC - reduces thermal load and extends battery life in always-on vehicle networks. |
| High Noise Immunity | VIH/VIL thresholds scale with VCC (e.g., 3.15 V/1.35 V at 4.5 V) - maintains robust logic levels across voltage droop events. |
| ESD Protection | >2000 V HBM - eliminates need for discrete TVS diodes on buffered I/O lines in cost-sensitive ECUs. |
Applications
| Memory Address Buffering | Automotive CAN Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between MCU and external Flash/EEPROM in engine control unit. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU address lines from memory device during read/write cycles. Use Value: Prevents bus contention during memory access arbitration while maintaining sub-12 ns timing margin at 40 MHz clock rates. | Use Scenario: Level-shifting and buffering TX/RX signals between 3.3 V CAN controller and 5 V CAN transceiver in gateway module. IC Role / Device Role / Timing Role: Bidirectional signal conditioner enabling voltage translation and bus isolation between controller and physical layer. Use Value: Eliminates need for discrete level shifters; ±6 mA drive ensures clean edge integrity over 1 m PCB traces. |
| Instrument Cluster Display Driver | Body Control Module I/O Expansion |
Use Scenario: Expanding GPIO count of 8-bit microcontroller to drive segment drivers for analog-style gauges. IC Role / Device Role / Timing Role: Parallel output expander providing additional sink/source capability for LED backlight and segment control. Use Value: Enables direct drive of 15 LSTTL-equivalent loads per output - reduces BOM by eliminating transistor arrays. | Use Scenario: Isolating microcontroller I/O from high-current door lock actuators and window motor drivers. IC Role / Device Role / Timing Role: High-impedance gate between low-power MCU and noisy 12 V actuator circuits. Use Value: Prevents backfeed and latch-up during actuator switching transients; 125°C rating supports under-dash mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244AQPWRQ1 | Lower VCC range (1.65–3.6 V); higher speed (tpd = 5.4 ns @ 3.3 V); 24 mA drive. | Optimized for 3.3 V-only automotive domains (e.g., infotainment SoCs); not suitable for 5 V legacy systems. | Select when system operates exclusively at 3.3 V and requires faster timing margins. |
| MC74VHC244DTG | Industrial temp range only (−40°C to +85°C); identical pinout and logic function; 8 mA drive @ 5 V. | Lacks AEC-Q100 qualification; unsuitable for safety-critical or under-hood deployments. | Acceptable for non-automotive industrial control where qualification is not required. |
Compared with SN74HC244QDWRQ1, SN74LVC244AQPWRQ1 offers superior speed and drive at 3.3 V but sacrifices 5 V compatibility, while MC74VHC244DTG provides functional equivalence at lower cost but lacks automotive qualification and extended temperature support.
Availability
SN74HC244QDWRQ1 is available at Aetrix Electronics and suitable for automotive electronic control units, instrument cluster subsystems, and body control modules requiring stable component supply across long production lifecycles.
Supply support for SN74HC244QDWRQ1 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 ICs, with decades of experience in high-reliability automotive electronics.
The SN74HC244-Q1 product line delivers AEC-Q100-qualified logic devices optimized for memory interfacing, bus buffering, and signal conditioning in demanding automotive environments.
FAQ
What is the maximum operating temperature for SN74HC244QDWRQ1?
The SN74HC244QDWRQ1 is rated for continuous operation from −40°C to +125°C ambient temperature, meeting AEC-Q100 Grade 1 requirements for under-hood automotive applications. This specification is validated per TI's production test flow and applies to the SOIC-20 (DW) package used in SN74HC244QDWRQ1.
Does SN74HC244QDWRQ1 support 3.3 V operation?
Yes, SN74HC244QDWRQ1 fully supports 3.3 V operation within its 2 V to 6 V supply range. At 3.3 V, it maintains guaranteed VIH (2.31 V min) and VIL (0.99 V max) thresholds, 11 ns typical propagation delay, and ±4.5 mA output drive - making it interoperable with 3.3 V microcontrollers and peripherals.
How many independent output-enable controls does SN74HC244QDWRQ1 have?
SN74HC244QDWRQ1 has two independent active-low output-enable inputs: 1OE (Pin 1) controls outputs 1Y1–1Y4, and 2OE (Pin 19) controls outputs 2Y1–2Y4. This dual-OE architecture allows selective activation of either 4-bit group, enabling flexible bus segmentation in memory-mapped or peripheral I/O designs.
Is SN74HC244QDWRQ1 pin-compatible with standard SN74HC244 variants?
Yes, SN74HC244QDWRQ1 shares identical pinout, electrical behavior, and functional block diagram with commercial SN74HC244 and SN74HC244N devices in SOIC-20 packages. The only differences are AEC-Q100 qualification, enhanced screening, and automotive-grade reliability testing - no PCB layout changes are needed for drop-in replacement.
What decoupling capacitance is recommended for SN74HC244QDWRQ1?
Texas Instruments recommends a 0.1 μF ceramic capacitor placed as close as possible to the VCC (Pin 20) and GND (Pin 10) pins of SN74HC244QDWRQ1. For systems with mixed-signal noise, paralleling with a 1 μF capacitor improves suppression of lower-frequency ripple while maintaining high-frequency transient response.
SN74HC244QDWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC244QDWRQ1 FAQ
1.How can I place an order for SN74HC244QDWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244QDWRQ1 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 SN74HC244QDWRQ1 reliable?
The price and inventory of SN74HC244QDWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244QDWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74HC244QDWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244QDWRQ1 transactions.
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4.How is shipping managed for SN74HC244QDWRQ1?
SN74HC244QDWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244QDWRQ1 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 SN74HC244QDWRQ1?
For technical support, including SN74HC244QDWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244QDWRQ1 requirements.
6.How does Aetrix verify that SN74HC244QDWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HC244QDWRQ1 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 SN74HC244QDWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HC244QDWRQ1?
All SN74HC244QDWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244QDWRQ1, 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 SN74HC244QDWRQ1 part is unused and in its original packaging.
Return procedure for SN74HC244QDWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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