Nexperia USA Inc. 74VHC595BQ,115

Overview

74VHC595BQ,115 from Nexperia is an 8-bit serial-in/parallel-out shift register with storage latch and 3-state outputs, operating at 2.0–5.5 V supply. It features separate shift (SHCP) and storage (STCP) clocks, asynchronous master reset (MR), and output enable (OE) for bus isolation-used in LED matrix drivers, I/O expansion for microcontrollers, and serial-to-parallel data conversion in industrial control panels.

For engineers reviewing the 74VHC595BQ,115 datasheet, 74VHC595BQ,115 pinout, 74VHC595BQ,115 application, or 74VHC595BQ,115 equivalent, this device supports high-speed cascading via Q7S, delivers sub-10 ns propagation delay at 5 V, maintains CMOS-level input compatibility, and operates across –40 °C to +125 °C in a thermally enhanced DHVQFN16 package.

Technical Context

The 74VHC595BQ,115 implements dual-register architecture: an 8-stage shift register accepting serial data on SHCP rising edges, and a parallel-output storage register loaded on STCP rising edges. Clock separation enables precise timing control between data shifting and latching-critical for glitch-free output updates in synchronous systems.

Its 3-state outputs (Q0–Q7) are controlled by active-low OE, allowing direct connection to shared buses without contention. The asynchronous MR pin clears all shift register stages independently of clock timing, supporting deterministic initialization in safety-critical sequencing applications.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, no leads, exposed thermal pad (non-soldered by default), 16 terminals with terminal 1 index area marked.

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 74VHC595BQ,115, the 74HC595N,652 offers legacy compatibility at the cost of thermal performance, while SN74LV595AQPWRQ1 trades pinout consistency for automotive-grade validation and inverted output control-neither is drop-in compatible without layout or firmware adjustment.

Availability

74VHC595BQ,115 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller I/O expansion, industrial PLC output modules, and remote sensor interface hubs requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74VHC595BQ,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 discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and sustainability.

The 74VHC series targets high-speed, low-power logic applications in industrial control, consumer electronics, and automotive subsystems-designed for pin compatibility with legacy TTL while delivering CMOS power efficiency and noise immunity.

FAQ

Can 74VHC595BQ,115 operate reliably at 3.3 V supply?

Yes. The device is fully specified from 2.0 V to 5.5 V, with VIH = 2.1 V and VOL ≤ 0.36 V at VCC = 3.0 V and IO = 4 mA-ensuring robust noise margins and drive capability in 3.3 V systems. Propagation delay increases to 5.9 ns (typ) at 3.3 V, still supporting >100 MHz operation.

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

The exposed pad (terminal 1 index area) has no electrical requirement and should remain floating or be connected to GND if soldered. It enhances thermal conduction from the die to the PCB, improving power dissipation capability-critical for sustained 8 mA output loading in compact layouts.

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

Separate SHCP and STCP inputs decouple serial shifting from parallel output updates. Data shifts through the 8-stage register without affecting Q0–Q7 until STCP triggers transfer to the storage latch-ensuring outputs remain stable and unchanged during serial loading cycles.

Is the MR pin synchronized to any clock, or is it purely asynchronous?

The MR pin is fully asynchronous and active LOW: asserting MR immediately clears all 8 shift register stages regardless of SHCP or STCP state. The storage register and outputs (Q0–Q7) retain their last latched values until STCP is pulsed or OE is toggled.