Nexperia USA Inc. 74HC595BZX

Overview

74HC595BZX from Nexperia is an 8-bit serial-in, serial-or-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 separate shift (SHCP) and storage (STCP) clocks, asynchronous master reset (MR), and output enable (OE) for bus isolation. Operates from 2.0 V to 6.0 V with typical 100 MHz shift-out frequency at VCC = 6 V.

For engineers reviewing the 74HC595BZX datasheet, 74HC595BZX pinout, 74HC595BZX application, or 74HC595BZX equivalent, this device supports cascaded shift-register chains via Q7S, enables synchronized parallel output latching, provides TTL-compatible input thresholds in HCT variant, and delivers robust ESD protection (HBM >2000 V) for industrial control interfaces.

Technical Context

The 74HC595BZX implements a dual-register architecture: an 8-stage shift register accepting serial data on DS with LOW-to-HIGH SHCP transitions, and an independent 8-bit storage register loaded on LOW-to-HIGH STCP edges. This separation allows continuous serial shifting while holding stable parallel outputs - critical for glitch-free display driving and buffered GPIO expansion.

Its 3-state outputs (Q0–Q7) are controlled solely by OE (active LOW); MR resets only the shift register without affecting stored data. Input clamp diodes permit safe interfacing to voltages exceeding VCC when used with current-limiting resistors, supporting mixed-voltage system integration.

Key Specifications

Pinout & Package

DHXQFN16 plastic leadless package (SOT8016-1), 2.0 mm × 2.4 mm × 0.48 mm body, 0.4 mm pitch, 16 terminals, exposed thermal pad (not electrically connected), moisture sensitivity level 1 (MSL1).

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 74HCT595BZX, the 74HC595BZX offers faster timing and lower input threshold sensitivity, while SN74HC595PWR trades miniaturization for manufacturability - selection depends on voltage compatibility, thermal envelope, and assembly capability.

Availability

74HC595BZX is available at Aetrix Electronics and suitable for LED matrix drivers, microcontroller I/O expanders, industrial PLC output modules, and remote control latch registers requiring stable component supply across automotive, industrial, and consumer product lifecycles.

Supply support for 74HC595BZX 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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and mobile markets.

The 74HC595BZX belongs to Nexperia's industry-standard 74HC logic family, engineered for reliable serial-to-parallel conversion in cost-sensitive, high-volume embedded control applications with stringent thermal and ESD requirements.

FAQ

Can 74HC595BZX operate at 3.3 V supply?

Yes - the 74HC595BZX is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH is 2.31 V (70% of VCC), VIL is 0.99 V (30% of VCC), and typical propagation delay increases to ~25 ns. All DC and AC parameters remain valid per datasheet Table 5 and Table 7.

How many 74HC595BZX devices can be cascaded?

There is no theoretical limit - cascading is achieved by connecting Q7S of one device to DS of the next. Practical limits arise from cumulative propagation delay (e.g., 15 ns × N stages) and signal integrity on long daisy-chain traces. For 10 MHz SPI clocks, up to 10–15 devices maintain timing margin with proper layout and termination.

What is the function of the MR pin during normal operation?

The MR (Master Reset) pin asynchronously clears only the shift register to zero; it does not affect the storage register or output states. During normal operation, MR should be held HIGH (via pull-up if unconnected). A LOW pulse on MR resets serial data pipeline without disturbing latched outputs - useful for error recovery or startup synchronization.

Does OE affect internal register states when disabled?

No - asserting OE HIGH places Q0–Q7 outputs in high-impedance state but leaves both shift and storage registers fully operational. Data continues to shift on SHCP, and latching continues on STCP. This allows output bus isolation while maintaining internal state integrity for seamless re-enablement.