Nexperia USA Inc. 74AHC594BQ,115

Overview

74AHC594BQ,115 from Nexperia is an 8-bit serial-in, parallel-out shift register with independent storage register, CMOS-level inputs, 2.0–5.5 V supply range, and DHVQFN16 (SOT763-1) package. It features separate positive-edge-triggered SHCP and STCP clocks, active-low SHR/STR resets, and Q7S serial output for cascading-used in LED matrix drivers and microcontroller GPIO expansion.

For engineers reviewing the 74AHC594BQ,115 datasheet, 74AHC594BQ,115 pinout, 74AHC594BQ,115 application, or 74AHC594BQ,115 equivalent, this device supports high-speed serial-to-parallel conversion with precise timing control, Schmitt-trigger inputs for noise immunity, and thermal-enhanced QFN packaging for compact industrial PCBs.

Technical Context

The 74AHC594BQ implements a two-stage architecture: an 8-bit shift register feeds an 8-bit D-type storage register, enabling synchronized latching of serial data. Both registers have independent clocks (SHCP for shifting, STCP for latching) and independent asynchronous clears (SHR, STR), allowing decoupled control of data capture and output update.

Its CMOS-level input thresholds (VIH = 3.85 V @ VCC = 5.5 V, VIL = 1.65 V) ensure compatibility with 3.3 V and 5 V logic families. Propagation delays are tightly balanced: tPLH/tPHL ≤ 7.8 ns (VCC = 4.5–5.5 V, CL = 50 pF), supporting up to 170 MHz operation on SHCP/STCP under nominal conditions.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, 16-terminal leadless construction with exposed thermal pad; optimized for thermal performance and PCB space efficiency in high-density layouts.

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 74AHCT594BQ,115, the TTL-input variant eases integration into legacy 5 V logic but sacrifices noise margin; versus SN74HC595PWR, the 74AHC594BQ offers superior thermal performance, independent reset control, and higher speed-critical for real-time industrial control.

Availability

74AHC594BQ,115 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial serial bus interfaces, and programmable logic controller output modules requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74AHC594BQ,115 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 with focus on efficiency, reliability, and miniaturization.

The 74AHC594BQ belongs to Nexperia's advanced AHC logic family-designed for high-speed, low-power, mixed-voltage digital interfacing in space-constrained industrial and automotive applications.

FAQ

What is the maximum operating frequency of the 74AHC594BQ,115?

The 74AHC594BQ,115 supports up to 170 MHz on SHCP or STCP at VCC = 4.5–5.5 V and 25 °C (typical), with guaranteed minimum fmax = 70 MHz over the full −40 °C to +125 °C range. This is validated per JEDEC JESD8-12E and confirmed in Table 7 of the Rev. 7 datasheet.

Can SHCP and STCP be tied together in a single-clock configuration?

Yes-SHCP and STCP may be connected, but the shift register will always be one clock pulse ahead of the storage register. This results in Qn outputs reflecting data shifted in during the prior cycle, not the current one. For synchronous behavior, use separate clocks with controlled phase alignment.

Does the DHVQFN16 package require soldering the thermal pad?

No-the exposed thermal pad (terminal 1 index area) has no electrical requirement to be soldered. If soldered, it must remain electrically floating or be connected to GND; improper connection risks signal integrity or thermal performance degradation per SOT763-1 mechanical specification.

How does the 74AHC594BQ differ from the 74HC595 in functional capability?

Unlike the 74HC595, the 74AHC594BQ provides independent active-low resets (SHR and STR) for shift and storage registers, separate clocks (SHCP/STCP), and Schmitt-trigger inputs. These features enable deterministic timing control, noise-immune operation, and safer reset isolation-critical in industrial automation and automotive systems.