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Texas Instruments SN74AHCT244QDWRG4
- Part No.:
- SN74AHCT244QDWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT244QDWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,763
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Product details
Overview
SN74AHCT244QDWRG4 from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC with dual 4-bit banks, TTL-compatible inputs, ±8 mA drive strength at 5 V, 7.4 ns typical propagation delay (CL = 15 pF), and operation across –40°C to +125°C - used in memory address buffering, bus transceivers, and clock distribution in automotive control modules.
For engineers reviewing the SN74AHCT244QDWRG4 datasheet, SN74AHCT244QDWRG4 pinout, SN74AHCT244QDWRG4 application, or SN74AHCT244QDWRG4 equivalent, this page delivers verified functional modes, bank-specific enable logic, thermal metrics for TSSOP-20, and automotive-qualified switching behavior under 4.5–5.5 V supply conditions.
Technical Context
The SN74AHCT244QDWRG4 implements two independent 4-bit non-inverting buffers, each with dedicated active-low output-enable (1OE/2OE) controlling high-impedance states. It uses TI's EPIC™ CMOS process, ensuring latch-up immunity >250 mA per JESD 17 and TTL-level input compatibility (VIH = 2 V, VIL = 0.8 V).
Its switching performance is characterized at 5 V ±0.5 V with load capacitances of 15 pF and 50 pF; tPLH/tPHL is 7.4 ns (typ) at 15 pF, while output-enable timing (tPZH/tPLZ) is 9.4 ns (typ) under same conditions - enabling precise timing control in synchronous bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation in automotive 5 V rail systems with ±10% tolerance. |
| Output Drive | ±8 mA - sufficient to drive standard TTL loads and 50 pF bus capacitance without signal degradation. |
| Propagation Delay | 7.4 ns (typ, CL = 15 pF) - supports >100 MHz bus toggle rates in address/data path applications. |
| Operating Temp | –40°C to +125°C - qualified for under-hood and powertrain ECUs per AEC-Q100 stress requirements. |
| Input Compatibility | TTL-voltage - accepts legacy 5 V TTL logic levels directly, eliminating level-shifter need. |
| Quiescent Current | 40 μA max - enables low-static-power operation in always-on vehicle subsystems. |
| Thermal Resistance | 83 °C/W (RθJA, PW package) - informs thermal design margin for continuous 8-channel operation at full load. |
Pinout & Package
TSSOP-20 (PW) package, 6.5 mm × 4.4 mm body size, 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 bank enable | Independent control of Bank 1 (pins 2–9) and Bank 2 (pins 11–18); tie to VCC via pullup for safe power-up high-Z. |
| 1A1–1A4, 2A1–2A4 | Input channels | Eight TTL-compatible digital inputs grouped into two 4-bit banks; no internal termination required. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State outputs | Non-inverting buffered outputs; high-impedance when respective OE is high - enables bidirectional bus sharing. |
| VCC, GND | Power terminals | Single 5 V supply; decoupling capacitor (0.1 μF) recommended adjacent to VCC pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Q-grade device meeting AEC-Q100 requirements for temperature, reliability, and ESD robustness in vehicle systems. |
| Dual independent banks | Two 4-bit sections with separate OE pins allow asynchronous enable/disable of address vs. data paths in microcontroller interfaces. |
| TTL-input compatibility | Accepts 0.8 V / 2.0 V logic thresholds directly - eliminates external level translation in mixed-logic designs. |
| High noise immunity | Dynamic VIH/VIL of 2.0 V / 0.8 V and 4.1 V VOH(min) ensure reliable operation in electrically noisy engine compartments. |
| Low power consumption | 40 μA max ICC enables use in battery-backed modules where standby current must remain below 100 μA. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Interface |
|---|---|
Use Scenario: Buffering microcontroller address lines to external flash memory during firmware updates. IC Role / Device Role / Timing Role: Non-inverting 3-state address driver isolating MCU from memory bus; enables concurrent access by diagnostic tools. Use Value: 7.4 ns propagation delay ensures setup/hold timing compliance with 50 MHz memory read cycles; dual OE allows selective bank disable during debug mode. | Use Scenario: Driving parallel pixel data from image sensor to SoC over short-reach PCB traces. IC Role / Device Role / Timing Role: Low-skew, 8-bit data line driver with controlled edge rates to minimize crosstalk in high-speed imaging paths. Use Value: ±8 mA drive strength maintains signal integrity across 50 pF trace+receiver capacitance; 1.2 mm TSSOP height fits compact camera module layouts. |
| Body Control Module (BCM) | Infotainment Head Unit Display Interface |
Use Scenario: Isolating I/O expanders from main CAN/LIN controller bus during sleep/wake transitions. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent bank enables - prevents backfeed during partial system power-down. Use Value: High-impedance state activated within 9.4 ns (tPHZ) ensures clean bus release before controller enters low-power mode. | Use Scenario: Level-shifting and driving RGB interface signals between display controller and TFT panel. IC Role / Device Role / Timing Role: TTL-compatible input buffer translating controller logic to panel timing requirements; 3-state allows shared bus arbitration. Use Value: 4.5–5.5 V supply range matches both controller and panel 5 V rails; automotive temp rating supports dashboard mounting. |
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 voltage range (1.65–3.6 V), 3.3 V logic only; 3.5 ns faster propagation but not automotive-qualified. | Suitable for consumer-grade 3.3 V systems only; lacks AEC-Q100 validation and extended temperature support. | Select only if operating exclusively at 3.3 V and automotive qualification is unnecessary. |
| MC74VHC244DT | Pin-compatible TSSOP-20; wider VCC range (2–5.5 V); higher ICC (100 μA max); no explicit automotive qualification. | Acceptable for industrial controls but lacks Q-grade documentation, latch-up test data, and AEC-Q100 change control. | Use where extended voltage flexibility matters more than automotive compliance or TI's EPIC™ process benefits. |
Compared with SN74LVC244APWR and MC74VHC244DT, the SN74AHCT244QDWRG4 uniquely combines automotive qualification, TTL-input compatibility, and guaranteed 5 V operation - making it the sole choice for legacy 5 V automotive bus interfaces requiring production traceability and AEC-Q100 assurance.
Availability
SN74AHCT244QDWRG4 is available at Aetrix Electronics and suitable for automotive ECU design, ADAS sensor interfacing, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT244QDWRG4 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 automotive and industrial design expertise.
The SN74AHCT244QDWRG4 belongs to TI's automotive-qualified logic portfolio, engineered specifically for robust signal buffering in harsh-temperature vehicle networks - emphasizing latch-up immunity, wide supply tolerance, and seamless TTL integration.
FAQ
What is the maximum operating temperature for SN74AHCT244QDWRG4?
The SN74AHCT244QDWRG4 is rated for operation from –40°C to +125°C ambient temperature, fully qualified per AEC-Q100 Grade 1 requirements. This specification is validated across all electrical parameters including propagation delay, output drive, and quiescent current - making SN74AHCT244QDWRG4 suitable for under-hood applications such as engine control units and transmission control modules where thermal margins are critical.
Does SN74AHCT244QDWRG4 support true 3-state operation on all eight outputs?
Yes, SN74AHCT244QDWRG4 provides true 3-state operation on all eight Y outputs, divided into two independent 4-bit banks (Bank 1: pins 12,14,16,18; Bank 2: pins 3,5,7,9). Each bank has its own active-low output-enable input (1OE and 2OE), allowing selective high-impedance control without affecting the other bank - essential for time-multiplexed bus architectures in automotive microcontroller systems.
Is SN74AHCT244QDWRG4 pin-compatible with standard SN74AHCT244 variants?
Yes, SN74AHCT244QDWRG4 uses the TSSOP-20 (PW) package with identical pinout to non-Q-grade SN74AHCT244PWR and SN74AHCT244QPWR variants. Pin functions - including dual OE inputs, separated A/Y banks, and VCC/GND locations - match exactly per TI's official package drawing PW0020A, enabling drop-in replacement in existing layouts where automotive qualification and enhanced reliability are added requirements.
What is the recommended power supply decoupling for SN74AHCT244QDWRG4?
TI recommends placing a 0.1 μF ceramic capacitor between VCC and GND as close as possible to pins 20 and 10 of SN74AHCT244QDWRG4. For systems with multiple devices or high-frequency switching, add a bulk 4.7 μF tantalum or aluminum electrolytic capacitor near the power entry point. This decoupling strategy suppresses supply noise induced by simultaneous output switching - critical for maintaining signal integrity in automotive bus applications where SN74AHCT244QDWRG4 drives multiple loads.
Can SN74AHCT244QDWRG4 interface directly with 3.3 V logic systems?
No, SN74AHCT244QDWRG4 is not designed for direct 3.3 V logic interfacing: its inputs require minimum VIH = 2.0 V and maximum VIL = 0.8 V under 4.5–5.5 V supply, and outputs swing rail-to-rail (0 V to VCC). While 3.3 V signals may be recognized as valid low inputs, high-level recognition is marginal and unreliable. To interface with 3.3 V controllers, use a level translator or select SN74LVC244APWR instead - SN74AHCT244QDWRG4 is optimized for 5 V TTL environments.
SN74AHCT244QDWRG4 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:
- 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-SOIC
SN74AHCT244QDWRG4 FAQ
1.How can I place an order for SN74AHCT244QDWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244QDWRG4 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 SN74AHCT244QDWRG4 reliable?
The price and inventory of SN74AHCT244QDWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244QDWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHCT244QDWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT244QDWRG4 transactions.
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4.How is shipping managed for SN74AHCT244QDWRG4?
SN74AHCT244QDWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244QDWRG4 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 SN74AHCT244QDWRG4?
For technical support, including SN74AHCT244QDWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244QDWRG4 requirements.
6.How does Aetrix verify that SN74AHCT244QDWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244QDWRG4 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 SN74AHCT244QDWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244QDWRG4?
All SN74AHCT244QDWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244QDWRG4, 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 SN74AHCT244QDWRG4 part is unused and in its original packaging.
Return procedure for SN74AHCT244QDWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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