Nexperia USA Inc. 74AHCT244D-Q100,11

Overview

74AHCT244D-Q100 from Nexperia is an automotive-grade octal 3-state buffer/line driver in SO20 package, featuring dual independent output enables (1OE, 2OE), TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), and operation from -40 °C to +125 °C. It supports mixed-voltage translation via overvoltage-tolerant inputs (up to 5.5 V) and delivers balanced propagation delays (tpd ≤ 7.4 ns @ CL = 15 pF, VCC = 5 V) for reliable bus interfacing in engine control units.

For engineers reviewing the 74AHCT244D-Q100 datasheet, 74AHCT244D-Q100 pinout, 74AHCT244D-Q100 application, or 74AHCT244D-Q100 equivalent, this device is selected for high-noise automotive data buses requiring precise timing control, level-shifting capability between 3.3 V and 5 V domains, and AEC-Q100 Grade 1 qualification with robust ESD protection (HBM > 2000 V).

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y0–Y3 of second group). Inputs feature Schmitt-trigger action for noise immunity, and outputs drive up to ±8 mA while maintaining VOH ≥ 3.70 V and VOL ≤ 0.55 V under full load at 125 °C.

The 74AHCT variant uses TTL-level input thresholds-ensuring compatibility with legacy 5 V logic families-while retaining CMOS low-power dissipation (ICC ≤ 80 μA at VCC = 5.5 V, -40 °C to +125 °C). Its overvoltage-tolerant inputs allow safe interfacing with 5.5 V signals even when powered from lower supply rails.

Key Specifications

Pinout & Package

74AHCT244D-Q100 uses the SO20 (SOT163-1) 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 orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the 74AHCT244D-Q100, the PW variant saves board area but sacrifices thermal headroom, while the BQ variant improves manufacturability and thermal response-making it optimal for thermally dense, safety-critical zones where AOI traceability is mandated.

Availability

74AHCT244D-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, and advanced driver assistance systems requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for 74AHCT244D-Q100 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 delivering high-performance, reliable logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

The 74AHCT series targets automotive signal integrity needs-specifically enabling robust, low-power bus interfacing in harsh environments through AEC-Q100 qualification, wide voltage tolerance, and noise-immune input design.

FAQ

Is the 74AHCT244D-Q100 pin-compatible with the 74AHC244D-Q100?

Yes-both share identical pinout, package (SO20), and functional architecture. The key difference lies in input threshold levels: 74AHCT244D-Q100 uses TTL-compatible VIH/VIL (2.0 V/0.8 V), while 74AHC244D-Q100 uses CMOS thresholds (3.85 V/1.65 V at VCC = 5.5 V). Swapping requires verifying source logic family compatibility.

Can the 74AHCT244D-Q100 operate reliably at 3.3 V supply?

No-it is specified only for 4.5 V to 5.5 V operation per Table 5. At 3.3 V, input thresholds fall outside guaranteed recognition range (VIH min = 2.0 V assumes VCC ≥ 4.5 V), and output drive degrades significantly. For 3.3 V systems, use the 74AHC244D-Q100 variant instead.

What is the maximum capacitive load this device can drive while maintaining timing specs?

The datasheet guarantees tpd ≤ 7.4 ns and ten/tdis ≤ 10.5 ns only up to CL = 15 pF at VCC = 5 V. At CL = 50 pF, propagation delay increases to ≤ 8.4 ns and disable time rises to ≤ 10.5 ns. For loads > 50 pF, add series termination or reduce trace length to maintain signal integrity.

Does the GND pad on the SO20 package require connection?

Pin 10 is the sole functional GND terminal; the exposed pad on SO20 (if present per variant) is not electrically connected and has no mechanical solder requirement. If soldered, it must remain floating or tied to GND-per Nexperia's SOT163-1 mechanical drawing-to avoid unintended thermal or electrical coupling.