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Texas Instruments SN74AHCT244QDWR
- Part No.:
- SN74AHCT244QDWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT244QDWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
SN74AHCT244QDWR from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC with dual 4-bit banks, TTL-compatible inputs, ±8 mA output drive, 5.5 V absolute max supply, and operation from –40°C to 125°C. It enables bidirectional bus isolation in memory address drivers, clock distribution networks, and industrial control backplanes.
For engineers reviewing the SN74AHCT244QDWR datasheet, SN74AHCT244QDWR pinout, SN74AHCT244QDWR application, or SN74AHCT244QDWR equivalent, key selection criteria include its dual active-low OE control, SOIC-20 package thermal resistance (58°C/W), 7.4 ns typical propagation delay at 15 pF, and AEC-Q100 qualification for automotive systems.
Technical Context
The SN74AHCT244QDWR implements two independent 4-bit non-inverting buffer banks, each with dedicated active-low output-enable (OE) inputs. Its EPIC™ CMOS process ensures latch-up immunity (>250 mA per JESD 17) and TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V).
Functional modes are strictly defined by OE state: when OE is low, data passes transparently from A inputs to Y outputs; when OE is high, all eight outputs enter high-impedance state. Power-up sequencing requires OE tied to VCC via pull-up resistor to guarantee defined Z-state during rail ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across automotive battery variations and noise margins. |
| Output Drive | ±8 mA - Sufficient to drive standard TTL loads and moderate-capacitance PCB traces without external buffering. |
| Propagation Delay | 7.4 ns typ (CL = 15 pF) - Enables reliable timing in 100+ MHz clock distribution and address bus applications. |
| Input Compatibility | TTL-level (VIH ≥ 2 V, VIL ≤ 0.8 V) - Direct interface with legacy 5 V logic families without level-shifting. |
| Thermal Resistance | RθJA = 58°C/W (SOIC-20) - Supports continuous operation at full load in industrial ambient up to 85°C. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive ECUs and industrial motor drives. |
| Quiescent Current | 40 μA max - Minimal standby power draw in always-on vehicle modules. |
Pinout & Package
SN74AHCT244QDWR 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. The package is RoHS-compliant, NIPDAU-finished, and MSL Level-1 rated for unlimited reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low bank enable | Independent control of Bank 1 (pins 2–9) and Bank 2 (pins 11–18); both must be low for output drive. |
| 1A1–1A4, 2A1–2A4 | Input terminals | Eight TTL-compatible digital inputs grouped into two 4-bit banks; no internal pull-ups or pull-downs. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Non-inverting buffered outputs; high-impedance when respective OE is high; ±8 mA sink/source capability. |
| VCC (Pin 20), GND (Pin 10) | Power rails | Single 5 V supply only; decoupling capacitor required within 10 mm of VCC/GND pins for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Meets automotive reliability requirements for temperature cycling, HAST, and ESD (≥2 kV HBM), enabling use in safety-critical ECUs. |
| Dual independent OE control | Enables selective isolation of two 4-bit data paths-e.g., isolating sensor data bus from actuator command bus in ADAS domain controllers. |
| EPIC™ process technology | Delivers latch-up immunity >250 mA and reduced dynamic power consumption versus standard CMOS. |
| TTL-input compatibility | Eliminates need for external level shifters when interfacing with legacy microcontrollers or FPGA I/O banks operating at 5 V. |
| Low input leakage | ±1 μA max input current allows direct connection to high-impedance sources (e.g., potentiometer wipers) without signal degradation. |
Applications
| Automotive Body Control Module | Industrial PLC Backplane |
|---|---|
Use Scenario: Isolating LIN bus transceiver data lines from MCU GPIO during firmware updates. IC Role / Device Role / Timing Role: 3-state buffer controlling bidirectional data flow between MCU and transceiver, synchronized to update sequence. Use Value: Prevents bus contention during reprogramming; ±8 mA drive supports 20 cm trace lengths on 2-layer PCBs. | Use Scenario: Driving parallel I/O expansion cards in modular PLC chassis with hot-swap capability. IC Role / Device Role / Timing Role: Address/data bus driver enabling clean signal integrity across 15 cm backplane runs at 20 MHz. Use Value: Dual OE control allows independent card enable/disable without resetting entire backplane; 7.4 ns delay ensures setup/hold compliance. |
| Automotive Instrument Cluster | Medical Diagnostic Equipment |
Use Scenario: Buffering SPI clock and data signals between display controller and TFT timing controller. IC Role / Device Role / Timing Role: Non-inverting clock/data repeater maintaining signal edge integrity across flex cable interconnects. Use Value: TTL-compatible inputs accept 3.3 V logic levels from controller; 5 V supply ensures margin against voltage droop on long flex traces. | Use Scenario: Isolating analog front-end ADC control lines from noisy digital processor bus in portable ultrasound units. IC Role / Device Role / Timing Role: Digital signal gate preventing coupling of processor switching noise into precision analog sections. Use Value: High-impedance state blocks DC and AC noise paths; <10 pF input capacitance minimizes loading on sensitive control lines. |
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 | 3.3 V only supply (1.65–3.6 V); lower drive (±24 mA); no AEC-Q100 qualification. | Suitable for consumer IoT gateways but not automotive under-hood use. | Select when system operates exclusively at 3.3 V and automotive qualification is unnecessary. |
| MC74VHC244DT | Pin-compatible; wider VCC range (2–5.5 V); higher ICC (100 μA max); no automotive qualification. | Acceptable for industrial HMIs where extended voltage range offsets lack of AEC-Q100. | Choose for mixed-voltage designs needing flexibility beyond 5 V nominal, but verify thermal performance at 125°C. |
Compared with SN74LVC244APWR and MC74VHC244DT, the SN74AHCT244QDWR uniquely combines 5 V TTL compatibility, AEC-Q100 qualification, and SOIC-20 thermal performance-making it the only option for automotive body electronics requiring guaranteed operation at 125°C with legacy 5 V logic interfaces.
Availability
SN74AHCT244QDWR is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC backplanes, medical diagnostic equipment, and instrument cluster subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT244QDWR 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 over 90 years of innovation in high-reliability silicon solutions.
The SN74AHCT244QDWR belongs to TI's automotive-qualified logic portfolio, designed specifically for robust signal buffering in harsh-environment vehicle subsystems where 5 V TTL interoperability and thermal resilience are mandatory.
FAQ
What is the maximum operating temperature for SN74AHCT244QDWR?
The SN74AHCT244QDWR is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per AEC-Q100 stress testing and applies to the SOIC-20 (DW) package used in SN74AHCT244QDWR. Thermal derating is not required below 125°C, and RθJA = 58°C/W ensures junction temperature remains within safe limits under typical industrial load conditions.
Does SN74AHCT244QDWR support 3.3 V logic inputs?
SN74AHCT244QDWR does not guarantee reliable operation with 3.3 V logic inputs. Its input thresholds are TTL-defined: VIH(min) = 2.0 V and VIL(max) = 0.8 V at VCC = 4.5–5.5 V. While a 3.3 V high-level signal may exceed VIH in many cases, marginal noise margins and process variation make it unsuitable for production designs without verification. For guaranteed 3.3 V compatibility, TI recommends SN74LVC244A instead.
How should unused inputs be handled on SN74AHCT244QDWR?
All unused inputs on SN74AHCT244QDWR must be tied to either VCC or GND-floating inputs are prohibited. TI explicitly states this in Section 5.2 Note 1 of the datasheet to prevent increased ICC, erratic output behavior, or potential latch-up. Unused OE inputs should be pulled high (to VCC) via a 10 kΩ resistor to ensure outputs remain in high-impedance state during power transitions.
What is the recommended decoupling for SN74AHCT244QDWR?
TI recommends placing a 100 nF ceramic capacitor between VCC and GND, located within 10 mm of pins 20 and 10 on the SN74AHCT244QDWR SOIC-20 package. This placement minimizes high-frequency supply impedance and suppresses switching noise generated by simultaneous output transitions. For systems with heavy bus activity, adding a bulk 4.7 μF tantalum capacitor nearby further stabilizes the 5 V rail.
Is SN74AHCT244QDWR pin-compatible with SN74AHCT244N?
Yes, SN74AHCT244QDWR is pin-compatible with SN74AHCT244N. Both devices use identical 20-pin SOIC (DW) packages with matching pin functions, spacing, and mechanical dimensions. However, SN74AHCT244QDWR is automotive-qualified (AEC-Q100), while SN74AHCT244N is commercial-grade. The Q suffix denotes enhanced reliability testing, not pinout change.
SN74AHCT244QDWR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHCT244QDWR FAQ
1.How can I place an order for SN74AHCT244QDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244QDWR 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 SN74AHCT244QDWR reliable?
The price and inventory of SN74AHCT244QDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244QDWR is usually 5 days.
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SN74AHCT244QDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244QDWR 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 SN74AHCT244QDWR?
For technical support, including SN74AHCT244QDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244QDWR requirements.
6.How does Aetrix verify that SN74AHCT244QDWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244QDWR 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 SN74AHCT244QDWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT244QDWR?
All SN74AHCT244QDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244QDWR, 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 SN74AHCT244QDWR part is unused and in its original packaging.
Return procedure for SN74AHCT244QDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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