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Texas Instruments SN74AHC244QDWR
- Part No.:
- SN74AHC244QDWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC244QDWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
SN74AHC244QDWR from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC with dual 4-bit sections, 2 V–5.5 V supply operation, ±8 mA output drive at 5 V, 3.9 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and -40°C to +125°C operating temperature - used for bus buffering, memory address driving, and signal isolation in automotive control modules.
For engineers reviewing the SN74AHC244QDWR datasheet, SN74AHC244QDWR pinout, SN74AHC244QDWR application, or SN74AHC244QDWR equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional mode behavior, real-world use cases, and two validated alternative parts for automotive-grade logic interfacing.
Technical Context
The SN74AHC244QDWR implements two independent 4-bit non-inverting buffers, each controlled by a dedicated 3-state output-enable input (1OE, 2OE). It uses TI's EPIC™ CMOS process for enhanced noise immunity and latch-up robustness (>250 mA per JESD17).
Each buffer section operates with rail-to-rail input compatibility (VI = 0–5.5 V), supports 15 pF and 50 pF load conditions, and guarantees high-impedance outputs when OE is high - enabling bidirectional bus sharing and hot-swap-safe signal routing in automotive infotainment and body control units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters |
| Output Drive Strength | ±8 mA at 5 V - sufficient to drive standard TTL loads and multiple CMOS inputs |
| Propagation Delay | 3.9 ns (typ) at 5 V/15 pF - enables reliable timing in high-speed address/data buses up to ~100 MHz |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and dashboard-mounted automotive ECUs |
| ESD Rating (HBM) | ±1500 V - meets AEC-Q100 stress requirements for assembly and field reliability |
| Input Clamp Current | ±20 mA - protects against transient overvoltage on unused or floating inputs |
| Power Dissipation Capacitance | 8.6 pF - low dynamic power consumption during switching, critical for thermally constrained modules |
Pinout & Package
SN74AHC244QDWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm (max height), with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low 3-state enable inputs - tie high via pullup to ensure Hi-Z during power-up |
| 2–5, 11–14, 17–18 | A inputs (1A1–1A4, 2A1–2A4) | Eight buffered data inputs - accept 0–5.5 V logic levels regardless of VCC |
| 3, 5, 7, 9, 12, 14, 16, 18 | Y outputs (1Y1–1Y4, 2Y1–2Y4) | Octal 3-state outputs - drive loads up to ±8 mA while maintaining rail-compatible VOH/VOL |
| 10 | GND | Ground reference - requires low-inductance connection to minimize ground bounce |
| 20 | VCC | Power supply - must be bypassed with 0.1 µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Q1 grade per AEC-Q100 - certified for safety-critical vehicle subsystems including ADAS sensor interfaces |
| EPIC™ CMOS process | Enables latch-up immunity >250 mA and stable operation across wide temperature and voltage ranges |
| Dual independent OE controls | Allows selective enabling of Group 1 (pins 2–5, 12–14, 16, 18) or Group 2 (pins 11, 13, 17, 19, 3, 5, 7, 9) without cross-talk |
| Input transition rate tolerance | 20 ns/V minimum at 5 V - rejects slow-edge noise from mechanical switches or long PCB traces |
| High-impedance state assurance | OE pins internally biased to avoid floating - external pullup ensures defined Hi-Z during brown-out conditions |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-current door lock actuators and window motor drivers. IC Role / Device Role / Timing Role: 3-state buffer isolating MCU outputs from noisy power stages while enabling shared bus access during diagnostics. Use Value: Prevents backfeed into MCU during actuator surge events and allows safe firmware updates without hardware disconnect. |
Use Scenario: Extending discrete I/O count on a DIN-rail mounted controller using parallel backplane wiring. IC Role / Device Role / Timing Role: Octal driver translating 3.3 V FPGA outputs to 5 V industrial sensors and relays with precise edge alignment. Use Value: Eliminates need for discrete level-shifting components and reduces board area by 40% vs. dual 74-series packages. |
| Automotive Infotainment Head Unit | Medical Diagnostic Equipment Interface |
Use Scenario: Buffering audio codec control lines (I²C, SPI) between application processor and peripheral ICs in EMI-sensitive cabin environment. IC Role / Device Role / Timing Role: Signal conditioner providing noise margin and slew-rate control for clock and data lines routed near RF modules. Use Value: Reduces bit errors in audio configuration registers by suppressing crosstalk-induced glitches on shared PCB layers. |
Use Scenario: Interfacing FPGA-based acquisition logic to legacy analog front-end boards requiring 5 V TTL-level strobes and handshakes. IC Role / Device Role / Timing Role: Level-adapting buffer ensuring setup/hold compliance for ADC trigger signals under varying load capacitance. Use Value: Guarantees <5 ns jitter on sample clocks across all channel counts, meeting IEC 62304 Class C timing requirements. |
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 VCC range (1.65–3.6 V); 24 mA drive at 3.3 V; 3.2 ns tPLH (3.3 V/15 pF) | Optimized for 3.3 V-only systems; not rated for 5 V operation or automotive temp range | Select when system uses only 3.3 V rails and requires higher drive strength at lower voltage |
| MC74VHC244DTG | Same 2–5.5 V range; -40°C to +105°C rating; 8 mA drive; 4.5 ns tPLH (5 V/15 pF); different pinout (TSSOP-20) | Lacks AEC-Q100 qualification; limited to commercial/industrial ambient; no Q1 suffix or automotive traceability | Use where automotive qualification is not required but same electrical performance is acceptable |
Compared with SN74LVC244APWR and MC74VHC244DTG, the SN74AHC244QDWR uniquely combines extended temperature support (-40°C to +125°C), AEC-Q100 qualification, and guaranteed 5 V interoperability - making it the only drop-in solution for production automotive ECUs requiring full lifecycle traceability and thermal resilience.
Availability
SN74AHC244QDWR is available at Aetrix Electronics and suitable for automotive control modules, industrial PLC I/O expansion, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for SN74AHC244QDWR 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 experience in high-reliability logic and interface solutions.
The SN74AHC244QDWR belongs to TI's AHC logic family - engineered for automotive-grade signal integrity, low power, and robust noise immunity in electric vehicle control units and advanced driver-assistance systems.
FAQ
What is the maximum operating temperature for SN74AHC244QDWR?
The SN74AHC244QDWR is rated for continuous operation from -40°C to +125°C ambient temperature, fully compliant with AEC-Q100 Grade 1 requirements. This specification is validated across all electrical parameters in the official TI datasheet SGDS017A, and applies specifically to the DW package variant used in SN74AHC244QDWR. Thermal derating is not required within this range.
Does SN74AHC244QDWR support 5 V logic interfacing?
Yes, SN74AHC244QDWR supports 5 V logic interfacing with guaranteed performance: VCC operates from 2 V to 5.5 V, inputs tolerate 0–5.5 V, and outputs deliver VOH ≥ 4.4 V and VOL ≤ 0.5 V at 5 V/8 mA load. Its 5 V switching characteristics (e.g., 3.9 ns tPLH) are explicitly characterized in Section 6.7 of the TI datasheet.
How many independent 3-state groups does SN74AHC244QDWR have?
SN74AHC244QDWR has two independent 3-state groups: Group 1 (1A1–1A4 → 1Y1–1Y4, controlled by 1OE on Pin 1) and Group 2 (2A1–2A4 → 2Y1–2Y4, controlled by 2OE on Pin 19). This dual-OE architecture enables selective bus partitioning - confirmed in the Function Table (Section 5) and Detailed Description (Section 8.3) of the TI datasheet.
Is SN74AHC244QDWR pin-compatible with SN74AHC244N?
No, SN74AHC244QDWR is not pin-compatible with SN74AHC244N. SN74AHC244QDWR uses a 20-pin SOIC (DW) package, while SN74AHC244N uses a 20-pin PDIP package. Although both share identical pin functions and numbering, the DW package has narrower lead pitch (1.27 mm vs. 2.54 mm), different body dimensions, and distinct thermal and soldering profiles - requiring PCB layout revision for substitution.
What is the recommended bypass capacitor for SN74AHC244QDWR?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) of SN74AHC244QDWR. This value is specified in Section 9.1 (Power Supply Recommendations) of the datasheet to suppress high-frequency noise and stabilize supply during output transitions. For multi-VCC systems, additional 0.01–0.022 µF capacitors per power pin are advised.
SN74AHC244QDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC244QDWR FAQ
1.How can I place an order for SN74AHC244QDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244QDWR 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 SN74AHC244QDWR reliable?
The price and inventory of SN74AHC244QDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244QDWR is usually 5 days.
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SN74AHC244QDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244QDWR 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 SN74AHC244QDWR?
For technical support, including SN74AHC244QDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244QDWR requirements.
6.How does Aetrix verify that SN74AHC244QDWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC244QDWR 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 SN74AHC244QDWR meets industry standards.
7.What is the process for return or replacement of SN74AHC244QDWR?
All SN74AHC244QDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244QDWR, 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 SN74AHC244QDWR part is unused and in its original packaging.
Return procedure for SN74AHC244QDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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