Nexperia USA Inc. 74AHC594DB,112

Overview

74AHC594DB,112 from Nexperia is an 8-bit non-inverting serial-in, parallel-out shift register with independent storage register, dual positive-edge-triggered clocks (SHCP and STCP), active-low asynchronous resets (SHR and STR), and cascading serial output Q7S. It operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C, and is used in LED matrix drivers and remote control holding registers where synchronized data latching and daisy-chained expansion are required.

For engineers reviewing the 74AHC594DB,112 datasheet, 74AHC594DB,112 pinout, 74AHC594DB,112 application, or 74AHC594DB,112 equivalent, this device delivers deterministic timing for synchronous serial-to-parallel conversion, precise clock-domain separation between shift and latch stages, and robust noise immunity via Schmitt-trigger inputs - critical for microcontroller GPIO expansion in industrial control panels.

Technical Context

The 74AHC594DB,112 implements a two-stage pipeline: an 8-bit shift register accepting serial data on DS at SHCP edges, followed by an independent 8-bit D-type storage register loaded on STCP edges. This architecture enables clean separation of data shifting and output updating - eliminating glitches during concurrent shift/latch operations.

Both SHR and STR provide dedicated asynchronous reset paths, allowing independent clearing of shift or storage registers without affecting the other stage. Input thresholds are CMOS-level (VIH = 3.85 V @ VCC = 5.5 V; VIL = 1.65 V), and all inputs tolerate overvoltage up to 5.5 V regardless of supply.

Key Specifications

Pinout & Package

74AHC594DB,112 uses the SOT338-1 (SSOP16) package - a 16-pin shrink small outline package with 0.65 mm pitch, 4.4 mm body width, and exposed thermal pad. Pin numbering follows standard SSOP orientation with pin 1 index marker.

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 74AHCT594DB,112, the AHC variant offers higher noise immunity and wider VCC range; compared with SN74HC595PWR, it provides true dual-clock isolation and dedicated reset controls essential for deterministic embedded timing.

Availability

74AHC594DB,112 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial remote control receivers, and programmable logic interfaces requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74AHC594DB,112 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, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in automotive, industrial, and consumer applications.

The 74AHC594 series belongs to Nexperia's advanced high-speed CMOS logic family, designed specifically for noise-immune, low-power serial-to-parallel data conversion in space-constrained and thermally demanding environments.

FAQ

What is the difference between SHCP and STCP in the 74AHC594DB,112?

SHCP (shift clock) advances serial data through the 8-bit shift register on each rising edge, while STCP (storage clock) transfers the entire 8-bit content from the shift register to the parallel output latches (Q0–Q7) on its rising edge. This two-clock architecture prevents output glitches during data loading and enables precise timing control in real-time systems.

Can SHCP and STCP be tied together in the 74AHC594DB,112?

Yes, but doing so causes the shift register to always be one clock ahead of the storage register - meaning the output reflects data shifted in during the previous cycle. For predictable behavior, Nexperia recommends using separate clocks unless the application explicitly requires this offset behavior, such as in certain pipeline or delay-line configurations.

Does the 74AHC594DB,112 support hot insertion or live swapping?

No - the 74AHC594DB,112 lacks Ioff protection and bus-hold circuitry. Applying VCC before or after signal voltages may cause latch-up or excessive current flow. Power sequencing per JEDEC JESD78 Class II Level A is required: apply GND first, then VCC, then inputs; reverse order for shutdown.

What package type does 74AHC594DB,112 use, and is it RoHS compliant?

74AHC594DB,112 uses the SOT338-1 (SSOP16) package - a 16-pin shrink small outline package with 0.65 mm pitch and 4.4 mm body width. It is fully RoHS compliant and halogen-free per Nexperia's product compliance documentation (document ID: 74AHC_AHCT594 v.7, May 2025).