Texas Instruments SN74HC244QDWRG4Q1

Overview

SN74HC244QDWRG4Q1 from Texas Instruments is an automotive-grade octal buffer and line driver with 3-state outputs, designed for memory address buffering, bus interfacing, and clock distribution in systems operating from 2 V to 6 V. It delivers ±6-mA output drive at 5 V, features typical propagation delay of 11 ns, and draws ≤80 μA ICC, enabling low-power, high-density bus management in automotive control modules.

For engineers reviewing the SN74HC244QDWRG4Q1 datasheet, SN74HC244QDWRG4Q1 pinout, SN74HC244QDWRG4Q1 application, or SN74HC244QDWRG4Q1 equivalent, key selection criteria include its AEC-Q100 qualification, dual independent 4-bit 3-state architecture, SOIC-20 package compatibility, and guaranteed operation across −40°C to +125°C ambient temperature.

Technical Context

The SN74HC244QDWRG4Q1 implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its CMOS HC logic family ensures TTL-compatible input thresholds and rail-to-rail output swing while maintaining low static current.

Each buffer operates in one of two functional modes: when OE is low, data passes transparently from A inputs to Y outputs; when OE is high, all four Y outputs enter high-impedance state-enabling bidirectional bus sharing without contention. Input clamp current rating of ±20 mA and junction temperature limit of 150°C support robust operation in automotive transients.

Key Specifications

Pinout & Package

SN74HC244QDWRG4Q1 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 1.27-mm lead pitch and 2.65-mm maximum height. The package is RoHS-compliant, NIPDAU lead-finished, and rated MSL Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74HC244QDWRG4Q1, SN74HCT244QDWRQ1 offers improved noise immunity in pure 5-V systems but reduced flexibility in mixed-voltage designs, while MC74VHC244DTG provides higher speed at the cost of automotive qualification and extended temperature support.

Availability

SN74HC244QDWRG4Q1 is available at Aetrix Electronics and suitable for automotive body control units, instrument clusters, ADAS domain controllers, and infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC244QDWRG4Q1 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 delivering high-reliability components for mission-critical systems.

The SN74HC244-Q1 product line is part of TI's automotive logic portfolio, engineered specifically for robust bus buffering, memory addressing, and signal isolation in harsh-temperature, high-EMI vehicle environments.

FAQ

What is the maximum operating temperature range for the SN74HC244QDWRG4Q1?

The SN74HC244QDWRG4Q1 is rated for operation from −40°C to +125°C ambient temperature and is AEC-Q100 Grade 1 qualified. This specification ensures reliable performance in under-hood and cabin-mounted automotive electronics where thermal cycling and sustained high temperatures occur. The device's junction temperature limit is 150°C, supporting safe operation even with moderate power dissipation and PCB thermal resistance.

Does the SN74HC244QDWRG4Q1 support 3.3-V logic interfaces?

Yes, the SN74HC244QDWRG4Q1 supports 3.3-V logic interfaces. Its wide 2-V to 6-V supply range and CMOS input thresholds (VIH = 1.5 V min at 2 V, 3.15 V min at 4.5 V) allow direct connection to 3.3-V microcontrollers and peripherals without level shifting. At 3.3 V, it delivers ≥±4 mA output drive and maintains <20 ns typical propagation delay, making it suitable for mixed-voltage automotive subsystems.

How many independent output-enable controls does the SN74HC244QDWRG4Q1 have?

The SN74HC244QDWRG4Q1 has two independent active-low output-enable inputs: 1OE controls the first 4-bit buffer group (1A1–1A4 → 1Y1–1Y4), and 2OE controls the second group (2A1–2A4 → 2Y1–2Y4). This dual-OE architecture enables selective bus arbitration, partial system wake-up, and time-multiplexed resource sharing-key for automotive domain controllers managing multiple memory or peripheral interfaces.

Is the SN74HC244QDWRG4Q1 pin-compatible with standard SN74HC244 variants?

Yes, the SN74HC244QDWRG4Q1 shares identical pinout, electrical characteristics, and functional behavior with non-automotive SN74HC244 variants in SOIC-20 (DW) package-including SN74HC244N and SN74HC244DR. However, it adds AEC-Q100 qualification, enhanced ESD protection (>2000 V HBM), and extended temperature validation, making it a drop-in replacement where automotive reliability is required.

What is the typical propagation delay of the SN74HC244QDWRG4Q1 at 5 V?

The typical propagation delay (tpd) of the SN74HC244QDWRG4Q1 is 11 ns at VCC = 4.5 V and CL = 50 pF, and 13 ns at VCC = 6 V under the same conditions. At exactly 5 V, interpolation yields ~11.5 ns typical delay. This value reflects the time from input transition to valid output transition and is critical for timing budgeting in high-speed address/data bus applications such as external memory interfacing in automotive microcontrollers.