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Texas Instruments SN74AHC244QDWRG4
- Part No.:
- SN74AHC244QDWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC244QDWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
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Product details
Overview
SN74AHC244QDWRG4 from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC with dual 4-bit channels, 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 SOIC-20 package. It enables bidirectional bus isolation in automotive infotainment control modules.
For engineers reviewing the SN74AHC244QDWRG4 datasheet, SN74AHC244QDWRG4 pinout, SN74AHC244QDWRG4 application, or SN74AHC244QDWRG4 equivalent, this page delivers verified electrical specs, functional pin mapping, automotive qualification context, and real-world use-case implementation guidance - all tied explicitly to the SN74AHC244QDWRG4 orderable part number and its Q1 automotive variant.
Technical Context
The SN74AHC244QDWRG4 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated 3-state output-enable input (1OE, 2OE). Its EPIC™ CMOS process ensures latch-up immunity (>250 mA per JESD17) and robust ESD tolerance (±1500 V HBM).
It operates across –40°C to +125°C with rail-to-rail input compatibility (VI = 0 to VCC) and guaranteed high-impedance outputs when OE is high. Propagation delays are load- and voltage-dependent: tPLH/tPHL = 3.9 ns (min) at VCC = 5 V, CL = 15 pF; tPZH/tPZL = 4.7 ns (min) for enable-to-output transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V bus) |
| IOH/IOL | –8 mA / +8 mA at VCC = 5 V - sufficient to drive standard TTL loads or 50-pF transmission lines |
| tPLH/tPHL | 3.9 ns min at VCC = 5 V, CL = 15 pF - enables high-speed address/data buffering in microcontroller peripheral buses |
| tPZH/tPZL | 4.7 ns min at VCC = 5 V, CL = 15 pF - fast output disable ensures clean bus release during state transitions |
| Operating Temp | –40°C to +125°C - qualified per AEC-Q100 for under-hood and dashboard electronics |
| Input Clamp Current | ±20 mA - protects against transient overvoltage on unused or floating inputs |
| ICC Quiescent | 40 μA max at VCC = 5.5 V - low static power supports always-on automotive subsystems |
Pinout & Package
SN74AHC244QDWRG4 uses a 20-pin SOIC (DW) package with 0.51 mm lead pitch, 13.3 mm body length, 7.5 mm body width, and 2.65 mm max height. Pin 1 index area located at top-left corner; pin numbering follows standard SOIC counterclockwise convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - tie high via pullup to ensure Hi-Z at power-up |
| 2–5, 11–14, 17–18 | 1A1–1A4, 2A1–2A4 | Buffer input pins - accept CMOS- or TTL-level signals across full VCC range |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4, 2Y3, 2Y2, 2Y1, 1Y4, 1Y3, 1Y2, 1Y1 | Non-inverting buffered outputs - drive external loads while maintaining signal integrity |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling |
| 20 | VCC | Power supply - requires local 0.1 μF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive applications (–40°C to +125°C), with customer-specific configuration control support |
| EPIC™ Process | Enhanced-Performance Implanted CMOS delivers improved noise immunity and reduced propagation skew vs. standard CMOS |
| 3-State Output Control | Dual independent OE inputs allow selective channel disabling without affecting other data paths |
| Latch-Up Immunity | Exceeds 250 mA per JESD17 - prevents destructive current flow during voltage transients |
| Wide Voltage Operation | 2 V–5.5 V supply range enables interoperability between legacy 5 V and modern 3.3 V/2.5 V systems |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from high-noise solenoid driver circuits in door lock actuation logic. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling safe signal routing between MCU and external drivers during reset or fault conditions. Use Value: Prevents back-driving of MCU pins during power sequencing; eliminates need for discrete level-shifting or optoisolation. |
Use Scenario: Expanding digital input capacity of a programmable logic controller using parallel sensor interface cards. IC Role / Device Role / Timing Role: Octal buffer isolates field-side sensors from internal backplane bus, reducing crosstalk and ground bounce. Use Value: Supports up to eight 24 V industrial sensors with <3.9 ns propagation delay, ensuring deterministic scan-cycle timing. |
| Automotive Infotainment Display Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Driving segment-select lines in a multiplexed LCD display within a vehicle head unit. IC Role / Device Role / Timing Role: Low-skew octal buffer synchronizes display refresh timing across multiple segments using shared clock domain. Use Value: Delivers consistent 8-bit parallel output with <0.5 ns inter-channel skew, eliminating visible flicker or ghosting. |
Use Scenario: Debouncing mechanical switch inputs on automated test fixtures used for PCB functional validation. IC Role / Device Role / Timing Role: Input filtering and noise rejection via Schmitt-trigger-compatible input thresholds and fast edge response. Use Value: Eliminates false triggers caused by contact bounce; supports >10 kcycles switch life without firmware debouncing overhead. |
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 |
|---|---|---|---|
| SN74LV244APWRE4 | Lower VCC range (1.65 V–5.5 V); lower drive strength (±6 mA at 3.3 V); TSSOP-20 only | Better suited for battery-powered portable instrumentation; not AEC-Q100 qualified | Select if operating below 2 V or requiring smaller footprint; avoid for automotive safety-critical functions |
| MC74VHC244DT | Same pinout; higher ICC (100 μA max); wider temp range (–55°C to +125°C); different ESD rating (±2 kV HBM) | Preferred for extended-temperature military/aerospace designs; lacks automotive configuration controls | Use where extreme cold-start performance is required; verify layout compatibility due to differing thermal resistance (RθJA = 70°C/W) |
Compared with SN74LV244APWRE4 and MC74VHC244DT, the SN74AHC244QDWRG4 uniquely combines AEC-Q100 qualification, dual OE control, and 8 mA drive at 5 V - making it the only option validated for automotive body control and infotainment bus isolation without derating or additional protection circuitry.
Availability
SN74AHC244QDWRG4 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O expansion, infotainment display interfaces, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC244QDWRG4 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 connectivity technologies, with decades of automotive-grade IC development experience.
The SN74AHC244QDWRG4 belongs to TI's AHC logic family - engineered for high-speed, low-power, and robust operation in automotive and industrial environments where signal integrity and reliability are critical.
FAQ
What is the automotive qualification status of SN74AHC244QDWRG4?
The SN74AHC244QDWRG4 is AEC-Q100 qualified (Grade 1: –40°C to +125°C) and designated as an automotive-grade device (Q1 suffix). It meets stringent automotive reliability, ESD, and latch-up requirements, including JESD17 latch-up immunity >250 mA and ±1500 V HBM ESD rating. This makes SN74AHC244QDWRG4 suitable for under-hood and cabin electronics where functional safety and long-term stability are mandatory.
Does SN74AHC244QDWRG4 support 3.3 V-only operation?
Yes, SN74AHC244QDWRG4 fully supports 3.3 V operation: VCC can range from 2 V to 5.5 V, and all specifications-including IOH/IOL (±4 mA at 3.3 V), propagation delay (5.8 ns min), and VIH/VIL thresholds-are guaranteed across that range. Its input thresholds scale with VCC, allowing reliable interfacing with both 3.3 V and 5 V logic families without level shifters.
How should unused inputs be handled on SN74AHC244QDWRG4?
All unused inputs on SN74AHC244QDWRG4 must be tied to either VCC or GND to prevent floating states that cause increased ICC, noise susceptibility, or undefined outputs. TI recommends connecting unused A-inputs directly to GND or VCC depending on desired default logic level; OE inputs should be pulled high (to VCC) via a resistor to ensure outputs remain in high-impedance state during power-up. Do not leave any input unconnected.
What is the thermal performance of SN74AHC244QDWRG4 in SOIC-20 package?
The SN74AHC244QDWRG4 in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (RθJA) of 58°C/W. At maximum rated ambient temperature (+125°C) and worst-case power dissipation (ICC × VCC ≈ 220 μW), junction temperature remains well below 150°C - confirming safe operation in sealed automotive enclosures without forced airflow or heatsinking.
Can SN74AHC244QDWRG4 replace SN74AHC244N in existing designs?
SN74AHC244QDWRG4 is not a direct drop-in replacement for SN74AHC244N due to differences in qualification and packaging: SN74AHC244N is commercial-grade (0°C to +70°C) in PDIP-20, while SN74AHC244QDWRG4 is automotive-grade (–40°C to +125°C) in SOIC-20. Electrical specs are identical, but PCB layout, thermal design, and reliability validation must be re-evaluated for automotive use. No layout changes are needed solely for pin compatibility - both are 20-pin devices with same pinout - but qualification scope differs fundamentally.
SN74AHC244QDWRG4 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:
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC244QDWRG4 FAQ
1.How can I place an order for SN74AHC244QDWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244QDWRG4 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 SN74AHC244QDWRG4 reliable?
The price and inventory of SN74AHC244QDWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244QDWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC244QDWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244QDWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244QDWRG4?
SN74AHC244QDWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244QDWRG4 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 SN74AHC244QDWRG4?
For technical support, including SN74AHC244QDWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244QDWRG4 requirements.
6.How does Aetrix verify that SN74AHC244QDWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244QDWRG4 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 SN74AHC244QDWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC244QDWRG4?
All SN74AHC244QDWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244QDWRG4, 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 SN74AHC244QDWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC244QDWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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