Nexperia USA Inc. 74AHC594DB-Q100J

Overview

74AHC594DB-Q100 from Nexperia is an automotive-grade 8-bit serial-in, parallel-out shift register with independent storage register, dual positive-edge clocks (SHCP/STCP), active-low asynchronous resets (SHR/STR), and cascading serial output Q7S. It operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C ambient, and delivers ≤8.5 ns propagation delay at 3.3 V (CL = 15 pF). It serves as a data serialization interface in automotive LED driver control and sensor data acquisition subsystems.

For engineers reviewing the 74AHC594DB-Q100 datasheet, 74AHC594DB-Q100 pinout, 74AHC594DB-Q100 application, or 74AHC594DB-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, independent shift/storage clocking for precise timing isolation, Schmitt-trigger inputs for noise immunity in harsh environments, and DHVQFN16 package with side-wettable flanks for AOI-compatible solder joint inspection.

Technical Context

This device implements two synchronized but functionally decoupled 8-bit registers: a shift register accepting serial data on DS with SHCP edge-triggered shifting, and a storage register capturing parallel outputs Q0–Q7 on STCP edges. The separation enables pipeline-style operation-data can be shifted in while previous data remains latched and stable on outputs.

Both SHR and STR are asynchronous, active-low, and operate independently: SHR clears only the shift register (resetting Q7S and internal stages), while STR clears only the storage register (forcing Q0–Q7 low). This allows selective reset without disrupting ongoing shift operations or output stability.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1) with 16 terminals, 0.5 mm pitch, exposed thermal pad (non-electrical), and side-wettable flanks for AOI-capable reflow inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC594DB-Q100, the 74AHC595DB-Q100 sacrifices independent reset isolation for lower cost, while SN74LV595AQDRQ1 trades AOI-ready packaging and higher drive for broader voltage compatibility but reduced ruggedness in noisy harness environments.

Availability

74AHC594DB-Q100 is available at Aetrix Electronics and suitable for automotive lighting control, body control module I/O expansion, instrument cluster display interfaces, and sensor data acquisition hubs requiring stable component supply across extended temperature ranges and AEC-Q100 compliance.

Supply support for 74AHC594DB-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, analog, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

The 74AHC594DB-Q100 belongs to Nexperia's automotive-qualified AHC logic family, designed specifically for robust serial-to-parallel data conversion in electrically noisy, thermally demanding vehicle subsystems.

FAQ

Can 74AHC594DB-Q100 operate at 2.0 V while maintaining full timing specifications?

Yes - the device is fully specified down to 2.0 V supply, with maximum propagation delays of 10.6 ns (SHCP→Q7S) and 11.3 ns (STCP→Qn) at VCC = 2.0 V, CL = 50 pF, and -40 °C to +125 °C. Input thresholds scale with VCC, ensuring reliable logic levels across the entire voltage range.

What is the function of the exposed thermal pad on the DHVQFN16 package?

The exposed pad (terminal 1 index area) is non-electrical and has no mandatory connection requirement. If soldered, it must remain electrically floating or be connected to GND per layout guidelines. Its primary role is mechanical stability and thermal conduction - not electrical grounding - and does not affect signal integrity or ESD performance.

How does the dual-clock architecture prevent output glitches during data loading?

Because SHCP shifts data through the internal shift register while STCP separately latches completed data into the output storage register, outputs Q0–Q7 remain static until STCP asserts. This decoupling ensures no intermediate or partial values appear on outputs - critical for driving relays, LEDs, or safety-critical loads without unintended activation.

Is Q7S output synchronized to SHCP or STCP?

Q7S is strictly synchronized to SHCP - it reflects the internal Q6S value after each SHCP rising edge and is independent of STCP timing. This allows predictable, edge-aligned cascading: Q7S from one device feeds DS of the next, forming a deterministic shift chain unaffected by storage register updates.