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Texas Instruments SN74AHCT244QPWR
- Part No.:
- SN74AHCT244QPWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244QPWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,857
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Product details
Overview
SN74AHCT244QPWR from Texas Instruments is an automotive-grade octal buffer/driver with dual 4-bit banks, 3-state outputs, TTL-compatible inputs, and ±8 mA drive strength at 4.5–5.5 V supply. It operates from –40°C to 125°C and is packaged in a 20-pin TSSOP (PW) for high-density bus interfacing in memory address and clock distribution systems.
For engineers reviewing the SN74AHCT244QPWR datasheet, SN74AHCT244QPWR pinout, SN74AHCT244QPWR application, or SN74AHCT244QPWR equivalent, this page delivers verified electrical specs, thermal metrics, functional modes, and real-world use context - all tied explicitly to the TSSOP-packaged SN74AHCT244QPWR variant.
Technical Context
The SN74AHCT244QPWR implements two independent 4-bit non-inverting buffers, each with dedicated active-low output-enable (OE) control. Its EPIC™ CMOS process ensures latch-up immunity >250 mA per JESD 17 and TTL-level input compatibility (VIH = 2 V, VIL = 0.8 V).
Each bank operates synchronously: when OE is low, A→Y data passes transparently; when OE is high, outputs enter high-impedance state. Propagation delays are specified at 5.4–13 ns (CL = 15–50 pF), and power dissipation capacitance is 8.2 pF at 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5 V rails with ±10% tolerance. |
| IOH/IOL | –8 mA / +8 mA - Supports direct driving of standard TTL loads without external pull-ups or level shifters. |
| tPLH/tPHL | 5.4 ns min / 9.5 ns max (CL = 50 pF) - Enables reliable timing in 100+ MHz bus systems with controlled skew. |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive ECUs and industrial control modules. |
| Input Compatibility | TTL-voltage - Accepts 0.8 V/2.0 V logic thresholds directly from legacy 5 V microcontrollers and FPGAs. |
| ICC (Quiescent) | 4 μA typical - Minimizes standby current in always-on subsystems like CAN gateway wake-up monitoring. |
| RθJA | 83 °C/W (TSSOP) - Requires minimal heatsinking in compact PCB layouts with moderate airflow. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable (Bank 1 & 2) | Independent control of each 4-bit bank; tie to VCC via pull-up for safe power-up high-Z state. |
| 1A1–1A4, 2A1–2A4 | Input channels (8 total) | Non-inverting data inputs; TTL-compatible, 10 pF max input capacitance. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state output channels (8 total) | Drive-strength-matched outputs with 0.36 V VOL @ 8 mA, enabling clean signal integrity on shared buses. |
| GND (Pin 10), VCC (Pin 20) | Power terminals | Dual-side power routing supports low-inductance decoupling; GND pin centrally located for noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Q-grade per AEC-Q100 - Validated for mission-critical vehicle networks including body control and infotainment gateways. |
| EPIC™ CMOS process | Enhanced latch-up immunity (>250 mA) and ESD robustness - Reduces field failure risk in noisy 12 V automotive environments. |
| Independent bank control | Separate 1OE/2OE pins - Enables time-multiplexed bus sharing between CPU and DMA peripherals without contention. |
| Low dynamic power | 8.2 pF Cpd at 1 MHz - Limits switching current in battery-powered telematics modules during burst-mode communication. |
| High noise margin | 0.4 V DC noise immunity (VIL = 0.8 V, VIH = 2.0 V) - Maintains logic integrity amid coupled transients from solenoid drivers or motor commutation. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Isolating MCU GPIOs from high-current door lock actuators and LED status indicators in a centralized BCM. IC Role / Device Role / Timing Role: Octal buffer providing level-shifted, current-boosted, and contention-free signal routing between 3.3 V MCU and 5 V peripheral subsystems. Use Value: Prevents backfeed and ground bounce while supporting simultaneous activation of four locks via parallel 4-bit bank control. |
Use Scenario: Extending the address/data bus of a programmable logic controller to support additional analog input cards in a DIN-rail mounted cabinet. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling hot-swappable I/O module detection and configuration via shared control lines. Use Value: Enables deterministic 5.4 ns propagation delay for cycle-accurate sampling synchronization across 8-channel ADC modules. |
| Automotive Instrument Cluster | Medical Diagnostic Equipment Backplane |
|
Use Scenario: Driving segmented LCD backlight controls and SPI-based display interface signals in a safety-critical digital instrument cluster. IC Role / Device Role / Timing Role: 3-state buffer isolating display controller outputs from shared power domains during sleep/wake transitions. Use Value: Guarantees glitch-free startup via OE-controlled high-Z default, meeting ASIL-B timing constraints for visual warning indication. |
Use Scenario: Interfacing FPGA-based signal processing cores with legacy 5 V sensor front-ends in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating between 3.3 V logic and 5 V analog subsystems while maintaining signal fidelity. Use Value: Eliminates need for discrete level-shifter ICs, reducing BOM count and board area in space-constrained handheld diagnostic units. |
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 |
|---|---|---|---|
| SN74AHCT244PWR | Commercial-grade (–40°C to 85°C), identical pinout and electrical specs except temp range and qualification. | Lacks AEC-Q100 automotive qualification; unsuitable for under-hood or safety-critical functions. | Select only for cost-sensitive consumer or industrial non-automotive designs where extended temperature is not required. |
| SN74LVC244APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), higher speed (tPD = 3.5 ns), but no TTL input compatibility. | Requires level translation for legacy 5 V systems; incompatible with direct connection to 5 V microcontrollers. | Prefer for new 3.3 V FPGA/CPU designs prioritizing speed and low voltage, but avoid in mixed-voltage 5 V legacy interfaces. |
Compared with SN74AHCT244QPWR, SN74AHCT244PWR trades automotive qualification for lower cost in benign environments, while SN74LVC244APWR enables faster 3.3 V systems but eliminates direct 5 V interoperability - making SN74AHCT244QPWR uniquely suited for automotive and industrial 5 V bus isolation where reliability and voltage compatibility are non-negotiable.
Availability
SN74AHCT244QPWR is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O expansion, medical diagnostic equipment backplanes, and instrument cluster interfaces requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for SN74AHCT244QPWR 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 delivering analog, embedded processing, and connectivity solutions with deep expertise in automotive, industrial, and power management applications.
The SN74AHCT244QPWR belongs to TI's automotive-qualified logic portfolio, designed specifically to replace legacy 74-series buffers in high-reliability 5 V bus systems where TTL compatibility, latch-up immunity, and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum operating temperature for SN74AHCT244QPWR?
The SN74AHCT244QPWR 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 specifically to the PW (TSSOP) package variant referenced in the SN74AHCT244QPWR ordering code.
Does SN74AHCT244QPWR support direct connection to 3.3 V microcontrollers?
SN74AHCT244QPWR accepts 3.3 V logic levels on its inputs - since its VIH threshold is 2.0 V and VIL is 0.8 V, a 3.3 V MCU output (typically VOH ≥ 2.4 V, VOL ≤ 0.4 V) meets these conditions. However, its outputs swing rail-to-rail at 5 V, so interfacing with 3.3 V receivers requires external level translation or clamping to avoid overvoltage damage.
How does the dual OE architecture of SN74AHCT244QPWR improve system design?
The SN74AHCT244QPWR features separate 1OE and 2OE pins controlling two independent 4-bit banks. This allows time-sliced bus access - for example, enabling Bank 1 to drive address lines while Bank 2 handles data strobes - eliminating contention and simplifying arbitration logic in multi-master systems such as automotive domain controllers.
Is SN74AHCT244QPWR pin-compatible with SN74AHCT244PWR?
Yes, SN74AHCT244QPWR and SN74AHCT244PWR share identical TSSOP-20 (PW) package dimensions, pinout, and footprint. The only differences are automotive qualification (Q-grade), extended temperature rating (–40°C to 125°C vs. –40°C to 85°C), and part marking (HB244Q vs. AHCT244P). No PCB changes are required for drop-in replacement in compatible thermal environments.
What is the recommended power-up sequence for SN74AHCT244QPWR?
TI recommends tying both 1OE and 2OE to VCC through a pull-up resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. This prevents bus contention before the host controller initializes. The SN74AHCT244QPWR datasheet specifies that OE must be held high until VCC stabilizes above 4.5 V for guaranteed high-Z behavior at power-on.
SN74AHCT244QPWR 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:
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT244QPWR FAQ
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2.Are the price and stock information for SN74AHCT244QPWR reliable?
The price and inventory of SN74AHCT244QPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244QPWR is usually 5 days.
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Once your SN74AHCT244QPWR 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 SN74AHCT244QPWR?
For technical support, including SN74AHCT244QPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244QPWR requirements.
6.How does Aetrix verify that SN74AHCT244QPWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244QPWR 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 SN74AHCT244QPWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT244QPWR?
All SN74AHCT244QPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244QPWR, 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 SN74AHCT244QPWR part is unused and in its original packaging.
Return procedure for SN74AHCT244QPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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