Nexperia USA Inc. 74AHC244D,118

Overview

74AHC244D,118 from Nexperia is an octal 3-state buffer/line driver with dual independent output enables (1OE, 2OE), operating across 2.0–5.5 V supply. It provides eight CMOS-level inputs and outputs, overvoltage-tolerant inputs up to 5.5 V, and balanced propagation delays of 3.4 ns (VCC = 5 V, CL = 15 pF). Used in bidirectional bus interfacing, memory address latching, and mixed-voltage signal translation between 3.3 V and 5 V domains.

For engineers reviewing the 74AHC244D,118 datasheet, 74AHC244D,118 pinout, 74AHC244D,118 application, or 74AHC244D,118 equivalent, this device supports high-noise-immunity digital buffering with Schmitt-trigger inputs, TTL-compatible variants (74AHCT244), and industrial-temperature operation up to +125 °C in SO20 packaging.

Technical Context

The 74AHC244D,118 implements two independent 4-bit buffered groups (Group 1: A0–A3 → Y0–Y3; Group 2: A0–A3 → Y0–Y3), each controlled by its own active-low output enable (1OE, 2OE). Outputs enter high-impedance state when respective OE is HIGH, enabling bus sharing without contention.

Its input structure includes Schmitt-trigger action for noise rejection and overvoltage tolerance up to 5.5 V-allowing safe interfacing with higher-voltage logic even when powered at 2.0 V or 3.3 V. Static drive capability is ±8 mA at VCC = 4.5 V, with guaranteed VOL ≤ 0.36 V and VOH ≥ 3.94 V under load.

Key Specifications

Pinout & Package

74AHC244D,118 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 index located at top-left corner with notch marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT244D,118, the original part offers superior mixed-voltage flexibility due to overvoltage-tolerant inputs, while SN74LVC244APWR delivers higher drive strength but sacrifices 5 V interoperability and thermal range.

Availability

74AHC244D,118 is available at Aetrix Electronics and suitable for industrial control systems, embedded instrumentation, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC244D,118 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

Nexperia is a global semiconductor expert specializing in high-performance, energy-efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHC244D,118 belongs to Nexperia's AHC logic family, engineered for low-power, high-speed buffering in mixed-voltage embedded systems with stringent ESD and thermal requirements.

FAQ

What is the maximum clock frequency supported by the 74AHC244D,118?

The 74AHC244D,118 does not operate on a clock; it is asynchronous. Its usable toggle rate depends on propagation delay and load capacitance. With 15 pF load and VCC = 5 V, tpd = 3.4 ns (typ), supporting clean signal edges up to ~100 MHz for short traces. System-level timing must account for setup/hold margins and PCB routing.

Can 74AHC244D,118 safely interface a 5 V microcontroller with a 3.3 V FPGA?

Yes - its inputs tolerate up to 5.5 V regardless of VCC, so connecting 5 V MCU outputs directly to 74AHC244D,118 inputs (powered at 3.3 V) is safe. Outputs swing rail-to-rail (0–3.3 V), making them compatible with 3.3 V FPGA inputs. No external level shifters required.

Is the 74AHC244D,118 pin-compatible with 74LS244 or 74F244?

No - while all are octal 3-state buffers, 74AHC244D,118 uses SO20 (SOT163-1) packaging with specific pin assignments (e.g., 1OE at pin 1, VCC at pin 20). 74LS244 and 74F244 typically use DIP20 or older SOIC packages with differing pinouts and electrical characteristics (e.g., TTL input thresholds, higher power).

Does the 74AHC244D,118 require external pull-up or pull-down resistors on its outputs?

No - outputs are actively driven HIGH or LOW when enabled, and enter true high-impedance (not floating) when disabled. Pull resistors are unnecessary unless needed for default logic state during power-up or reset sequences, which should be handled separately via system-level design.