Nexperia USA Inc. 74AHCT594BQ-Q100,1

Overview

74AHCT594BQ-Q100 from Nexperia is an automotive-qualified 8-bit serial-in, parallel-out shift register with independent storage register, TTL-level inputs, dual positive-edge clocks (SHCP/STCP), and active-low asynchronous resets (SHR/STR). It operates from 4.5 V to 5.5 V across –40 °C to +125 °C and delivers ≤7.8 ns propagation delay at 5 V, enabling high-speed serial-to-parallel data conversion in automotive body control modules.

For engineers reviewing the 74AHCT594BQ-Q100 datasheet, 74AHCT594BQ-Q100 pinout, 74AHCT594BQ-Q100 application, or 74AHCT594BQ-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, DHVQFN16 package with side-wettable flanks for AOI, independent clock/reset control, and guaranteed 70 MHz maximum frequency at 125 °C ambient.

Technical Context

This device implements a two-stage pipeline: an 8-bit shift register accepting serial data on DS with SHCP-triggered shifting, followed by an 8-bit D-type storage register loaded via STCP. Both registers feature dedicated asynchronous clears (SHR and STR), and Q7S provides cascading capability. The architecture ensures deterministic timing between shift and latch operations.

Input thresholds comply with TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), while outputs drive ±8 mA with VOH ≥ 3.7 V and VOL ≤ 0.55 V under load. Schmitt-trigger action on all inputs enhances noise immunity in electrically noisy automotive environments.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1), 2.5 × 3.5 × 0.85 mm body, side-wettable flanks for automated optical inspection (AOI), no leads, 16 terminals, thermal-enhanced construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with 74AHC594BQ-Q100 and SN74HC595QPWRQ1, the 74AHCT594BQ-Q100 offers superior automotive-grade timing control via separate SHCP/STCP and SHR/STR, enabling deterministic multi-stage data staging essential for safety-critical lighting and display subsystems.

Availability

74AHCT594BQ-Q100 is available at Aetrix Electronics and suitable for automotive LED lighting control, body control module I/O expansion, instrument cluster display multiplexing, and automotive sensor data aggregation requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT594BQ-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 components for automotive, industrial, and consumer applications, with leadership in logic, MOSFETs, and ESD protection.

The 74AHCT594BQ-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust serial-to-parallel data conversion in harsh environments where AEC-Q100 Grade 1 reliability and precise timing control are mandatory.

FAQ

Can 74AHCT594BQ-Q100 operate at 3.3 V supply?

No. The 74AHCT594BQ-Q100 is TTL-input compatible and specified only for 4.5 V to 5.5 V operation. At 3.3 V, VIH minimum (2.0 V) may be met, but VOH/VOL performance degrades outside spec, and AEC-Q100 qualification does not cover sub-4.5 V operation. Use 74AHC594BQ-Q100 for 3.3 V systems.

What is the function of the exposed pad (terminal 1) in the DHVQFN16 package?

Terminal 1 is a non-electrical mechanical index marker-not a ground pad. Nexperia explicitly states there is no electrical or mechanical requirement to solder it. If soldered, it must remain electrically floating or be connected to GND; it serves no thermal or electrical function in normal operation.

How does the dual-clock architecture improve system timing reliability?

Separate SHCP and STCP allow independent control of data shifting and output latching. This prevents race conditions during continuous data streaming-e.g., new data can be shifted in while previous data remains held on outputs, eliminating glitches during display updates or actuator control transitions.

Is Q7S output buffered or open-drain?

Q7S is a standard CMOS push-pull output, identical in structure and drive strength (±8 mA) to the parallel outputs Q0–Q7. It is not open-drain and requires no external pull-up; it drives high/low actively and supports direct connection to the DS input of a downstream device in cascade configurations.