Nexperia USA Inc. 74HCT595PW,118

Overview

74HCT595PW,118 from Nexperia is an 8-bit serial-in/serial-or-parallel-out shift register with separate shift and storage registers, 3-state outputs, TTL-compatible inputs, and asynchronous master reset. It operates from 4.5 V to 5.5 V, supports up to 52 MHz shift clock frequency at 5 V, and delivers parallel output drive capability of ±6 mA per Qn pin. It is used in LED matrix drivers and microcontroller GPIO expansion where cascaded serial-to-parallel conversion is required.

For engineers reviewing the 74HCT595PW,118 datasheet, 74HCT595PW,118 pinout, 74HCT595PW,118 application, or 74HCT595PW,118 equivalent, this device serves as a robust, temperature-rated (–40 °C to +125 °C), TSSOP16-packaged interface IC for deterministic serial data latching and buffered parallel output control in resource-constrained embedded systems.

Technical Context

The 74HCT595PW,118 implements dual synchronous register architecture: an 8-stage shift register clocks data in via DS on SHCP rising edges, then transfers contents to an independent 8-bit storage latch on STCP rising edges. This separation enables glitch-free output updates and supports daisy-chaining via Q7S.

Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure compatibility with legacy 5 V microcontrollers, while 3-state outputs (enabled by active-low OE) allow bus sharing without contention. The MR input asynchronously clears only the shift register, preserving storage register state until next STCP.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm lead pitch, exposed pad optional. Pin 1 index marked by notch or dot; pin numbering follows standard counter-clockwise convention from index corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-to-parallel shift register applications.

Compared with SN74HC595PWR and 74LV595PW,118, the 74HCT595PW,118 provides optimal balance of TTL compatibility, 5 V robustness, and industrial temperature support-making it the default choice for legacy 5 V embedded control where input threshold matching is essential.

Availability

74HCT595PW,118 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial I/O modules, and legacy system interface adapters requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74HCT595PW,118 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 components for automotive, industrial, mobile, and consumer electronics markets.

The 74HCT595PW,118 belongs to Nexperia's industry-standard 74-series logic family, designed specifically for robust serial-to-parallel data conversion in space- and cost-constrained embedded systems.

FAQ

Can 74HCT595PW,118 operate reliably at 3.3 V supply?

No. The 74HCT595PW,118 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may not be met by many 3.3 V logic sources, and output drive strength degrades significantly. For 3.3 V systems, use 74LV595PW,118 or 74LVC595PW instead.

What is the maximum number of 74HCT595PW,118 devices that can be cascaded?

There is no theoretical limit-cascading is constrained only by timing margins and signal integrity. Each stage adds ~24 ns STCP-to-output delay and ~52 ns SHCP-to-Q7S delay. Practical limits depend on clock frequency and PCB layout; 10–20 stages are routinely implemented with proper termination and ground design.

Does OE affect the internal storage register when pulled HIGH?

No. The OE pin controls only the output buffer impedance and has no effect on the storage register contents or shift register state. Data remains latched in the storage register regardless of OE status, enabling safe output disabling during reconfiguration.

Is the MR pin synchronous or asynchronous?

The MR pin is asynchronous and active LOW. A LOW pulse on MR immediately clears the shift register contents to zero, independent of SHCP or STCP edges. The storage register and Qn outputs remain unchanged until the next STCP event.