Nexperia USA Inc. 74HCT595PW,112

Overview

74HCT595PW,112 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,112 datasheet, 74HCT595PW,112 pinout, 74HCT595PW,112 application, or 74HCT595PW,112 equivalent, this device serves as a robust, temperature-rated (–40 °C to +125 °C) interface for driving 8-bit parallel loads from SPI or bit-banged serial streams while enabling output isolation via OE control and multi-device daisy-chaining via Q7S.

Technical Context

The 74HCT595PW,112 implements dual synchronous register architecture: an 8-stage shift register clocks data in on SHCP rising edges and feeds Q7S for cascading, while STCP rising edges latch that data into an independent 8-bit storage register. Output enable (OE) controls high-impedance state of all eight Qn outputs without affecting internal register states.

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, and its 3-state outputs support bus sharing. The MR input asynchronously clears only the shift register, preserving storage register contents until next STCP edge.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16-pin, 4.4 mm body width, 0.65 mm pitch; lead-free and RoHS compliant.

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 74HC595PW,118, the 74HCT595PW,112 offers guaranteed TTL-level input compatibility with 3.3 V–5 V mixed-signal systems; compared with SN74LV595AQPWRQ1, it provides drop-in TSSOP16 footprint compatibility and lower cost for non-automotive industrial use.

Availability

74HCT595PW,112 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial I/O modules, and relay bank controllers requiring stable component supply across extended temperature ranges.

Supply support for 74HCT595PW,112 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, and efficient logic, discrete, and MOSFET solutions with focus on automotive, industrial, and consumer applications.

The 74HCT595 belongs to Nexperia's industry-standard 74-series logic portfolio, designed specifically for robust serial-to-parallel data conversion in space-constrained, thermally demanding embedded systems.

FAQ

Can 74HCT595PW,112 operate with a 3.3 V microcontroller's SPI output?

No - the 74HCT595 requires VIH ≥ 2.0 V, but its input threshold is optimized for 5 V TTL levels. A 3.3 V MCU may not reliably meet the 2.0 V minimum with margin under voltage droop or noise. Use level-shifting or select 74LVC595 for guaranteed 3.3 V compatibility.

What happens to Q0–Q7 outputs during MR assertion?

Asserting MR (LOW) clears only the shift register; the storage register and Q0–Q7 outputs remain unchanged until the next STCP rising edge. Outputs stay active and retain their last latched state unless OE is also asserted.

Is Q7S synchronized to SHCP or STCP?

Q7S reflects the internal Q6S signal and updates on each SHCP rising edge - it is fully synchronous to the shift clock, not the storage clock. This enables deterministic bit alignment when cascading multiple devices.

Does OE affect the internal storage register state?

No - OE only controls the output buffer enable/disable state. The storage register contents remain intact and unaltered regardless of OE logic level, allowing safe output isolation during system reconfiguration.