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Texas Instruments SN74AHCT244QPWRG4
- Part No.:
- SN74AHCT244QPWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244QPWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,470
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Product details
Overview
SN74AHCT244QPWRG4 from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC with TTL-compatible inputs, 5-V supply operation, ±8-mA output drive, and dual independent 4-bit banks each controlled by active-low OE. It enables bidirectional bus isolation in memory address and clock distribution systems.
For engineers reviewing the SN74AHCT244QPWRG4 datasheet, SN74AHCT244QPWRG4 pinout, SN74AHCT244QPWRG4 application, or SN74AHCT244QPWRG4 equivalent, key selection criteria include its AEC-Q100 qualification, TSSOP-20 package footprint, 7.4-ns typical propagation delay at 15-pF load, and dual-bank 3-state control for flexible bus management.
Technical Context
The SN74AHCT244QPWRG4 implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) control. Its EPIC™ CMOS process ensures latch-up immunity exceeding 250 mA per JESD 17 and TTL-level input compatibility across 4.5–5.5 V supply range.
Functional modes are strictly defined: when OE is low, data passes transparently from A inputs to Y outputs; when OE is high, outputs enter high-impedance state. Power-up/down sequencing requires OE tied to VCC via pullup resistor to guarantee defined 3-state behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in automotive 5-V rail environments with ±10% tolerance. |
| Output Drive | ±8 mA - Sufficient to drive standard TTL loads and 15-pF capacitive bus lines without signal degradation. |
| Propagation Delay | 7.4 ns (typ) at 15 pF - Enables reliable timing in high-speed address/data buffering up to ~100 MHz system clocks. |
| Input Compatibility | TTL voltage thresholds (VIL = 0.8 V, VIH = 2.0 V) - Direct interface with legacy 5-V TTL logic without level-shifting. |
| Operating Temperature | –40 °C to +125 °C - Qualified for under-hood and engine-control module deployment per AEC-Q100 Grade 1. |
| Quiescent Current | 40 μA (max) at 5.5 V - Minimizes standby power in always-on vehicle subsystems. |
| 3-State Leakage | ±2.5 μA (max) - Prevents bus contention and signal corruption during high-impedance mode. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm body size, 0.65-mm lead pitch, 1.2-mm max height. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Active-low output enable (Bank 1 / Bank 2) | Independent control of each 4-bit bank; asserted low enables buffer pass-through, high forces high-Z outputs. |
| 1A1–1A4, 2A1–2A4 | Input terminals (Bank 1 / Bank 2) | Noninverting data inputs accepting TTL-compatible logic levels; no internal pullups/pulldowns. |
| 1Y1–1Y4, 2Y1–2Y4 | Output terminals (Bank 1 / Bank 2) | 3-state buffered outputs capable of sourcing/sinking ±8 mA; high-Z state isolates bus segments. |
| VCC (Pin 20), GND (Pin 10) | Power supply terminals | Single 5-V supply; decoupling capacitor required near VCC/GND pins to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Meets automotive reliability requirements for temperature cycling, humidity, and lifetime stress testing. |
| EPIC™ Process Technology | Delivers enhanced noise immunity, latch-up resistance >250 mA, and stable parametric performance over temperature. |
| Dual Independent Banks | Enables selective bus segmentation-e.g., isolate memory address lines from peripheral I/O without shared control. |
| TTL-Compatible Inputs | Accepts standard 5-V TTL logic thresholds (0.8 V/2.0 V), eliminating need for external level translators. |
| Low Propagation Skew | tsk(o) ≤ 1 ns - Ensures tight timing alignment across all 8 channels for synchronous bus applications. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Isolating microcontroller address/data bus from external flash memory and CAN controller peripherals. IC Role / Device Role / Timing Role: Octal 3-state buffer managing bidirectional memory addressing and peripheral select signals under real-time OS scheduling. Use Value: Dual OE control allows dynamic partitioning of bus segments during firmware updates or fault recovery without system reset. |
Use Scenario: Driving multiple I/O modules on a modular PLC backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bus driver enabling hot-swap capability by placing inactive modules in high-Z state during insertion/removal. Use Value: ±8-mA drive strength sustains signal integrity across 20-cm backplane traces while meeting IEC 61000-4-2 ESD immunity. |
| Automotive Infotainment Head Unit | Medical Diagnostic Imaging Controller |
|
Use Scenario: Buffering display interface signals between application processor and LVDS transmitter ASIC. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for parallel RGB control lines synchronized to pixel clock domain. Use Value: 7.4-ns tPHL/tPLH ensures setup/hold margin for 60-MHz pixel clocks with minimal skew across 8-bit data lanes. |
Use Scenario: Interfacing FPGA-based image processing core to analog front-end ADC/DAC modules. IC Role / Device Role / Timing Role: Isolation buffer preventing noise coupling from digital logic into sensitive analog signal paths. Use Value: High-impedance state eliminates DC loading on ADC reference lines during calibration cycles, preserving <0.1% accuracy. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower 3.3-V supply only; 24-mA drive; wider 1.65–3.6-V VCC range; not AEC-Q100 qualified. | Suitable for 3.3-V industrial or consumer systems; lacks automotive temperature and reliability validation. | Select when cost-sensitive 3.3-V designs require higher drive strength and do not require automotive qualification. |
| MC74VHC244DT | Pin-compatible TSSOP-20; 2.0–5.5-V operation; ±8-mA drive; AEC-Q100 Grade 2 (–40 °C to +105 °C). | Limited to under-dash infotainment or body control modules where extended high-temp operation is not required. | Choose for drop-in replacement where full Grade 1 (125 °C) operation is unnecessary and second-source availability is prioritized. |
Compared with SN74LVC244APWR and MC74VHC244DT, the SN74AHCT244QPWRG4 uniquely delivers AEC-Q100 Grade 1 compliance, TTL input compatibility at 5 V, and guaranteed 125 °C operation-making it the only option qualified for powertrain and safety-critical engine management systems.
Availability
SN74AHCT244QPWRG4 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC backplane interfacing, and medical imaging controller development requiring stable component supply across long production lifecycles.
Supply support for SN74AHCT244QPWRG4 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 electronics with decades of automotive qualification expertise.
The SN74AHCT244QPWRG4 belongs to TI's automotive logic portfolio, engineered specifically for robust 5-V bus buffering in engine control, transmission, and chassis systems demanding AEC-Q100 reliability.
FAQ
What is the operating temperature range for the SN74AHCT244QPWRG4?
The SN74AHCT244QPWRG4 is rated for –40 °C to +125 °C, meeting AEC-Q100 Grade 1 requirements for under-hood automotive applications. This range is validated across all electrical parameters including propagation delay, output drive, and 3-state leakage, ensuring consistent performance in extreme thermal environments encountered in engine control modules.
Does the SN74AHCT244QPWRG4 support TTL-level inputs?
Yes, the SN74AHCT244QPWRG4 features TTL-voltage compatible inputs with VIL ≤ 0.8 V and VIH ≥ 2.0 V at VCC = 4.5–5.5 V. This allows direct connection to legacy 5-V TTL logic families without level-shifting circuitry, simplifying integration in mixed-technology automotive subsystems.
What package type is used for the SN74AHCT244QPWRG4?
The SN74AHCT244QPWRG4 uses a TSSOP-20 (PW) package measuring 6.5 mm × 4.4 mm with 0.65-mm lead pitch and 1.2-mm maximum height. It is RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating, supporting standard reflow profiles without moisture sensitivity concerns.
How does the dual OE architecture of the SN74AHCT244QPWRG4 improve system design?
The SN74AHCT244QPWRG4 provides two independent active-low output-enable inputs (1OE and 2OE), allowing separate control of its two 4-bit banks. This enables selective bus isolation-for example, holding memory address lines active while tri-stating peripheral I/O lines during DMA transfers-reducing signal contention and improving real-time determinism in automotive ECUs.
Is the SN74AHCT244QPWRG4 pin-compatible with other octal buffer variants?
The SN74AHCT244QPWRG4 shares identical TSSOP-20 pinout and function mapping with SN74AHCT244QPWR and SN74AHCT244QDWR, differing only in packaging and marking. However, it is not pin-compatible with LVC or VHC family variants due to differences in input threshold definitions and ESD protection structures, despite identical pin numbering.
SN74AHCT244QPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT244QPWRG4 FAQ
1.How can I place an order for SN74AHCT244QPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244QPWRG4 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 SN74AHCT244QPWRG4 reliable?
The price and inventory of SN74AHCT244QPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244QPWRG4 is usually 5 days.
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Once your SN74AHCT244QPWRG4 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 SN74AHCT244QPWRG4?
For technical support, including SN74AHCT244QPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244QPWRG4 requirements.
6.How does Aetrix verify that SN74AHCT244QPWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244QPWRG4 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 SN74AHCT244QPWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244QPWRG4?
All SN74AHCT244QPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244QPWRG4, 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 SN74AHCT244QPWRG4 part is unused and in its original packaging.
Return procedure for SN74AHCT244QPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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