Nexperia USA Inc. 74HCT594PWJ

Overview

74HCT594PWJ from Nexperia is an 8-bit serial-in/parallel-out shift register with separate shift and storage registers, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), 100 MHz typical maximum clock frequency, and independent SHCP/STCP clocks enabling precise timing control in LED matrix drivers and I/O expanders. It operates from -40 °C to +125 °C and features active-low reset pins (SHR, STR) for synchronous register clearing.

For engineers reviewing the 74HCT594PWJ datasheet, 74HCT594PWJ pinout, 74HCT594PWJ application, or 74HCT594PWJ equivalent, key selection considerations include its TSSOP16 package (SOT403-1), 4.4 mm body width, dual-clock architecture for glitch-free output latching, and guaranteed 6.0 mA output drive per Qn pin at VCC = 4.5 V.

Technical Context

The device implements two cascaded 8-bit registers: a shift register accepting serial data on DS at SHCP rising edges, and a storage register transferring data from the shift register on STCP rising edges. This separation prevents output glitches during shifting and enables simultaneous update of all eight parallel outputs (Q0–Q7).

Input clamping diodes allow safe interfacing with voltages exceeding VCC when used with current-limiting resistors. The TTL-level inputs ensure direct compatibility with legacy microcontroller GPIOs without level-shifting, while the CMOS output stage delivers rail-to-rail swing and 35 mA absolute max output current per pin.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): 16-pin thin shrink small outline, 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-in/parallel-out shift register applications.

Compared with 74HC594PW, the 74HCT594PWJ offers guaranteed TTL-level compatibility and simpler integration with legacy 5 V controllers; versus SN74LV595APW, it provides tighter timing specs at 5 V but lower output current - making it optimal for cost-sensitive, noise-immune 5 V-only systems.

Availability

74HCT594PWJ is available at Aetrix Electronics and suitable for LED display drivers, microcontroller I/O expansion, industrial serial data converters, and remote control holding registers requiring stable component supply across automotive, industrial, and consumer temperature ranges.

Supply support for 74HCT594PWJ 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 computing markets, with leadership in logic, discrete, and MOSFET technologies.

The 74HCT594 belongs to Nexperia's industry-standard 74-series logic family, designed specifically for robust, pin-compatible replacements in legacy 5 V digital systems requiring TTL-compatible inputs and low-power CMOS outputs.

FAQ

What is the maximum recommended clock frequency for 74HCT594PWJ at 5 V supply?

The 74HCT594PWJ supports a maximum clock frequency of 92 MHz (typical) at VCC = 4.5 V and 20 °C ambient, with 24 MHz guaranteed minimum across the full -40 °C to +125 °C operating range. This allows reliable operation in high-speed LED multiplexing and serial data capture applications without timing violations.

Can 74HCT594PWJ be used with 3.3 V microcontrollers?

No - the 74HCT594PWJ is specified for VCC = 4.5 V to 5.5 V and requires TTL-level inputs (VIH ≥ 2.0 V). While it may function with 3.3 V logic HIGH signals under some conditions, VIH is not guaranteed below 4.5 V, risking unreliable operation. Use 74LV595 or 74HC595 for true 3.3 V compatibility.

How does the dual-clock architecture prevent output glitches?

The separate SHCP (shift clock) and STCP (storage clock) inputs decouple serial data loading from output updating. Data shifts through the internal register on SHCP edges, then transfers atomically to the output latches on STCP edges - ensuring Q0–Q7 remain stable during shifting and change only at precisely controlled moments.

Is the TSSOP16 package (SOT403-1) compatible with standard reflow soldering profiles?

Yes - the 74HCT594PWJ in TSSOP16 (SOT403-1) is qualified for standard lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. Its 0.65 mm pitch and exposed pad-free design support automated assembly using standard stencil thicknesses and reflow profiles for fine-pitch components.