Nexperia USA Inc. 74AHC244PW,118

Overview

74AHC244PW,118 from Nexperia is an octal 3-state buffer/line driver in TSSOP20 package, operating from 2.0 V to 5.5 V supply, featuring two independent output-enable inputs (1OE, 2OE), overvoltage-tolerant inputs up to 5.5 V, and Schmitt-trigger inputs for noise immunity - used in bidirectional bus interfacing and voltage-level translation between mixed-supply domains in industrial control backplanes.

For engineers reviewing the 74AHC244PW,118 datasheet, 74AHC244PW,118 pinout, 74AHC244PW,118 application, or 74AHC244PW,118 equivalent, this device is selected for robust 3-state bus buffering where CMOS-level input compatibility, low propagation delay (≤5.5 ns at 5 V), and thermal-enhanced TSSOP packaging are required in space-constrained embedded systems.

Technical Context

The 74AHC244PW,118 implements dual 4-bit non-inverting buffer sections with independent active-low 3-state controls (1OE, 2OE), enabling selective isolation of two 4-bit data paths. Each section drives four outputs (1Y0–1Y3 or 2Y0–2Y3) with rail-to-rail CMOS-compatible output swing and high-impedance OFF-state leakage < ±10 μA at 5.5 V.

Its input structure includes Schmitt-trigger action on all eight inputs (1A0–1A3, 2A0–2A3), providing hysteresis of ~0.3 V at 3.3 V, and overvoltage tolerance up to 5.5 V regardless of VCC - allowing safe interfacing with 5 V signals while powered from 3.3 V or 2.5 V rails.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT244PW,118, the 74AHC244PW,118 offers wider supply flexibility and overvoltage safety but lacks native TTL input compatibility; versus SN74LVC244APWR, it trades lower voltage operation for robust 5.5 V input tolerance and industrial temp grade.

Availability

74AHC244PW,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller GPIO expansion, automotive body control modules, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74AHC244PW,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, reliable logic, analog, and MOSFET solutions for industrial, automotive, and consumer applications.

The 74AHC244PW,118 belongs to Nexperia's AHC logic family, designed for low-power, high-speed CMOS-compatible buffering in mixed-voltage embedded systems with stringent noise immunity and thermal reliability requirements.

FAQ

Can 74AHC244PW,118 operate with VCC = 2.5 V while accepting 5 V inputs?

Yes. The device features overvoltage-tolerant inputs rated to 5.5 V independent of VCC, enabling safe 5 V signal reception even at minimum 2.0 V supply. Input thresholds scale with VCC (VIH ≈ 0.7×VCC), so at 2.5 V VCC, VIH ≈ 1.75 V - sufficient for clean 5 V logic-high detection with margin.

What is the maximum capacitive load the outputs can drive while maintaining specified tpd?

The datasheet guarantees tpd ≤7.0 ns at VCC = 4.5–5.5 V with CL = 50 pF. Driving loads >50 pF increases propagation delay nonlinearly and may cause overshoot; for >100 pF, series termination or buffer staging is recommended to maintain timing integrity and signal fidelity.

Is the exposed thermal pad on the TSSOP20 package electrically connected?

No. Per SOT360-1 mechanical drawing, the exposed pad is not electrically tied to any internal node. It may remain floating or be soldered to GND for thermal improvement, but no electrical connection is required or specified - grounding it does not affect functionality or ratings.

How does Schmitt-trigger action improve noise immunity in real-world layouts?

Schmitt-trigger inputs provide ~0.3 V hysteresis at 3.3 V, meaning a rising edge must exceed VIH + 0.15 V and falling edge must drop below VIL − 0.15 V to toggle. This rejects noise spikes <300 mV peak-to-peak and prevents oscillation on slow edges (e.g., RC-filtered reset lines), eliminating need for external debounce circuitry.