Nexperia USA Inc. 74HCT244D-Q100,118

Overview

74HCT244D-Q100,118 from Nexperia is an automotive-grade octal non-inverting 3-state buffer/line driver in SO20 package, featuring dual independent output enables (1OE, 2OE), TTL-compatible input thresholds (VIH = 2.0 V min at VCC = 4.5–5.5 V), and operation across -40 °C to +125 °C. It supports bidirectional bus interfacing in engine control units and ADAS domain controllers where level translation and bus isolation are required.

For engineers reviewing the 74HCT244D-Q100,118 datasheet, 74HCT244D-Q100,118 pinout, 74HCT244D-Q100,118 application, or 74HCT244D-Q100,118 equivalent, key selection criteria include automotive AEC-Q100 Grade 1 qualification, 3-state timing (t_en = 15 ns typ, t_dis = 15 ns typ at VCC = 4.5 V), output drive capability (±6 mA), and SO20 package compatibility with legacy PCB footprints.

Technical Context

This device implements two independent 4-bit buffered paths, each controlled by a dedicated active-low output enable (1OE for Y0–Y3 group, 2OE for Y0'–Y3' group), enabling selective bus gating without propagation delay penalty between channels. Its TTL-level inputs allow direct interfacing with legacy microcontrollers and FPGAs operating at 5 V logic.

The SO20 package (SOT163-1) provides 20-pin plastic small outline construction with 7.5 mm body width and 1.27 mm lead pitch, supporting wave soldering and automated optical inspection. Input clamp diodes permit safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

SO20 plastic small outline package (SOT163-1), 20-lead, 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 buffer applications.

Compared with 74HCT244D-Q100,118, the PW variant saves board space but increases assembly complexity, while the TI part introduces layout risk without functional benefit-Nexperia's SO20 remains optimal for legacy-compatible, high-volume automotive production.

Availability

74HCT244D-Q100,118 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and infotainment head units requiring stable component supply across extended automotive lifecycles.

Supply support for 74HCT244D-Q100,118 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 delivering high-performance logic, analog, and MOSFET solutions optimized for automotive, industrial, and mobile applications.

The 74HCT244-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to meet stringent AEC-Q100 reliability, thermal, and ESD requirements in safety-critical vehicle subsystems.

FAQ

Is 74HCT244D-Q100,118 pin-compatible with standard 74HCT244 devices?

Yes-74HCT244D-Q100,118 uses the industry-standard SO20 (SOT163-1) footprint and identical pinout as generic 74HCT244 devices. All 20 pins match function-for-function, including VCC (pin 20), GND (pin 10), and dual OE inputs (pins 1 and 19). No PCB redesign is needed for drop-in replacement in existing designs.

What is the maximum capacitive load this device can drive reliably?

The device is characterized up to 50 pF load capacitance per output (per Table 9 test conditions), with guaranteed t_pd ≤ 33 ns and t_dis ≤ 45 ns at VCC = 4.5 V. For loads exceeding 50 pF, rise/fall times degrade linearly-designers should limit total net capacitance (including trace + stub + receiver input) to ≤45 pF to maintain timing margin in 25 MHz bus applications.

Does this part support mixed-voltage operation (e.g., 3.3 V inputs with 5 V VCC)?

No-74HCT244D-Q100,118 has TTL-compatible inputs referenced to VCC, so VIH minimum is 2.0 V at VCC = 4.5–5.5 V. Applying 3.3 V inputs while VCC = 5 V is acceptable (3.3 V > 2.0 V), but 3.3 V inputs with VCC = 3.3 V are not supported-the HCT family requires VCC ≥ 4.5 V for guaranteed TTL threshold behavior.

How does the SO20 package compare thermally to DHVQFN20 for this device?

The SO20 (SOT163-1) package has a junction-to-ambient thermal resistance (R_θJA) of 109 °C/W, while DHVQFN20 (SOT764-1) achieves 111 °C/W. Though numerically similar, the DHVQFN offers superior thermal spreading via exposed pad-when soldered to a 2-layer 1-in² copper pour, its effective R_θJA drops to ~45 °C/W. SO20 remains preferred for wave-soldered legacy boards; DHVQFN suits high-power-density modules.