Diodes Incorporated 74HC594T16-13

Overview

74HC594T16-13 from Diodes Incorporated is an 8-bit serial-in, parallel-out shift register with separate storage register and dual active-low reset (SHR/STR), operating from 2.0V to 6.0V supply. It features push-pull Q0–Q7 outputs, cascading-capable Q7S serial output, Schmitt-trigger inputs, and independent shift/storage register clocks (SHCP/STCP). Used in microcontroller GPIO expansion for LED matrix drivers and industrial I/O modules.

For engineers reviewing the 74HC594T16-13 datasheet, 74HC594T16-13 pinout, 74HC594T16-13 application, or 74HC594T16-13 equivalent, key selection criteria include dual-reset independence, 8mA drive capability at 4.5V, TSSOP-16 thermal performance, propagation delay ≤38ns at 6.0V, and cascading support via Q7S.

Technical Context

The device implements two synchronized but independently clocked 8-bit registers: a shift register accepting serial data on DS at each SHCP rising edge, and a storage register loaded on STCP rising edge. Both SHR and STR are asynchronous active-low resets, fully decoupled from clock edges.

Output stage uses push-pull drivers with guaranteed VOH ≥3.98V and VOL ≤0.26V at IOH/IOL = ±4mA (4.5V), while Q7S supports daisy-chaining with tPD ≤38ns (6.0V). All inputs tolerate 6.0V regardless of VCC and include Schmitt-trigger hysteresis for noise immunity.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9mm × 6.4mm body, 0.65mm pitch, 1.08mm max height, exposed pad optional, RoHS-compliant lead-free finish.

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 SN74HC595PWR and 74LV595PW,118, the 74HC594T16-13 uniquely supports independent shift/storage register control and noise-immune cascading - critical for deterministic real-time I/O expansion in harsh environments.

Availability

74HC594T16-13 is available at Aetrix Electronics and suitable for LED matrix drivers, industrial I/O expanders, microcontroller GPIO extension, and test fixture signal generation requiring stable component supply across automotive, factory automation, and embedded design cycles.

Supply support for 74HC594T16-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and logic solutions for industrial and automotive markets.

The 74HC594 belongs to Diodes' HC logic family designed for robust, low-power serial-to-parallel conversion in space-constrained, thermally demanding applications - emphasizing timing precision, noise immunity, and long-term supply stability.

FAQ

Can 74HC594T16-13 operate reliably at 3.3V supply?

Yes. The device is fully specified from 2.0V to 6.0V. At VCC = 3.3V, VIH(min) = 2.1V, VOL(max) = 0.1V at IOL = 20μA, and fMAX ≈ 50MHz - meeting standard 3.3V LVTTL logic thresholds and enabling direct interfacing with ARM Cortex-M microcontrollers without level translation.

What is the function of Q7S versus Q7, and how do they differ electrically?

Q7 is the parallel output of the storage register's MSB; Q7S is the serial output of the shift register's MSB. Electrically, Q7S has identical VOH/VOL specs but is optimized for cascading: its tPD (SHCP→Q7S) is 14ns at 6.0V, matching shift register timing, whereas Q7 reflects STCP→Q7 delay (≤38ns). Q7S must drive DS of the next device; Q7 drives external loads.

Is the TSSOP-16 package of 74HC594T16-13 compatible with reflow soldering per J-STD-020?

Yes. Diodes specifies the TSSOP-16 package for lead-free reflow per JEDEC J-STD-020D. Peak temperature is 260°C, with 20–40s duration above 217°C. The device's MSL level is 1 (unlimited floor life), and its thermal resistance (θJA) is 130°C/W - verified in the AP02002 package outline document.

How does the dual-reset architecture improve system reliability compared to single-reset shift registers?

SHR clears only the shift register (preserving Q0–Q7 outputs), allowing safe data pre-loading while maintaining current outputs. STR clears only the storage register (zeroing Q0–Q7), enabling immediate output shutdown without disrupting serial data flow. This separation prevents race conditions during power-up, firmware reset, or fault recovery sequences in safety-critical I/O systems.