Nexperia USA Inc. 74VHCT595BQ,115

Overview

74VHCT595BQ,115 from Nexperia is an 8-bit serial-in/parallel-out shift register with storage latch and 3-state outputs, designed for serial-to-parallel data conversion in microcontroller I/O expansion and LED matrix control. It features TTL-compatible inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), operates from −40 °C to +125 °C, and delivers 130 MHz max clock frequency with 3.8 ns typical SHCP→Q7S propagation delay at 5 V.

For engineers reviewing the 74VHCT595BQ,115 datasheet, 74VHCT595BQ,115 pinout, 74VHCT595BQ,115 application, or 74VHCT595BQ,115 equivalent, key selection criteria include its dual-clock architecture (SHCP and STCP), asynchronous master reset (MR), output enable (OE) for bus isolation, and DHVQFN16 thermal-enhanced package for high-density PCB layouts.

Technical Context

The device implements two independent synchronous registers: an 8-stage shift register clocked by SHCP (data shifted on rising edge) and a separate 8-bit storage register clocked by STCP (data latched on rising edge). This decoupled architecture enables pipelined operation-new serial data can be loaded while previous parallel data remains stable on outputs.

Its 3-state outputs (Q0–Q7) are controlled by active-low OE, and all outputs enter high-impedance state when OE = HIGH. The MR input asynchronously clears the shift register (but not the storage register), supporting robust initialization without disrupting latched outputs.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, no leads, thermally enhanced exposed pad (non-soldered or floating GND), 16 terminals, pin 1 index 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 74VHCT595BQ,115, the 74HC595N offers lower cost but sacrifices noise immunity and speed, while SN74LV595AQPWRQ1 adds automotive qualification at the expense of thermal performance and output drive - making the BQ variant optimal for space-constrained industrial control where TTL compatibility and thermal efficiency are critical.

Availability

74VHCT595BQ,115 is available at Aetrix Electronics and suitable for industrial HMIs, automotive body controllers, and embedded I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74VHCT595BQ,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 leading Dutch semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with a focus on reliability, energy efficiency, and automotive-grade quality.

The 74VHCT series targets industrial and automotive applications demanding TTL-compatible interfacing, wide temperature operation, and robust ESD protection - delivering pin-equivalent upgrades to legacy 74LS devices without redesign.

FAQ

Can 74VHCT595BQ,115 operate at 3.3 V?

No. The 74VHCT595BQ,115 is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible inputs require VIH ≥ 2.0 V, but internal logic thresholds and output drive are not guaranteed below 4.5 V. For 3.3 V systems, use 74LVC595 or 74AHC595 variants instead.

What happens if SHCP and STCP are tied together?

When SHCP and STCP are connected, the shift register advances one stage per clock cycle, and the storage register captures the previous state - causing outputs to lag input by one clock. This configuration works but forfeits pipelining; for glitch-free updates, keep clocks independent and stagger STCP after SHCP.

Is the exposed pad on the DHVQFN16 package required to be soldered?

No. Per Nexperia's SOT763-1 specification, the exposed pad has no electrical or mechanical requirement to be soldered. If connected, it must remain floating or be tied to GND - never left unconnected and floating, as this may degrade thermal performance or cause EMI issues.

How does MR interact with the storage register?

The MR pin resets only the 8-stage shift register (stages 0–7); it has no effect on the storage register or Q0–Q7 outputs. This allows safe clearing of incoming serial data without altering currently displayed or controlled outputs - a key feature for fault recovery in real-time systems.