Diodes Incorporated 74HCT594T16-13

Overview

74HCT594T16-13 from Diodes Incorporated is an 8-bit serial-in, parallel-out shift register with separate 8-bit storage register and serial output (Q7S), operating at 4.5–5.5 V supply, supporting up to 92 MHz shift clock frequency at 5 V, with push-pull outputs (Q0–Q7) and dual active-low asynchronous resets (SHR, STR), used for microcontroller-driven LED matrix control and industrial I/O expansion.

For engineers reviewing the 74HCT594T16-13 datasheet, 74HCT594T16-13 pinout, 74HCT594T16-13 application, or 74HCT594T16-13 equivalent, this device enables reliable serial-to-parallel conversion in noise-prone environments, supports cascading via Q7S, features Schmitt-trigger inputs for robust signal integrity, and delivers ±35 mA drive capability on bus outputs - critical for direct LED or relay driver interfacing.

Technical Context

The 74HCT594T16-13 integrates two synchronized but independently clocked registers: an 8-bit shift register clocked by SHCP (rising edge) and a storage register clocked by STCP (rising edge), enabling pipeline-style data staging. Its dual asynchronous reset lines (SHR and STR) operate independently of clocks and clear respective registers to zero when low.

All inputs accept 0–6.0 V logic levels, and outputs switch on falling edge after register update; when SHCP and STCP are tied together, the shift register leads the storage register by exactly one clock cycle. The Q7S serial output allows daisy-chaining multiple devices without external logic.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 mm × 6.4 mm body, 0.65 mm pitch, 1.08 mm max height, lead-free and RoHS-compliant, optimized for high-density PCB layouts and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC595PWR and 74LV595PW,118, the 74HCT594T16-13 provides deterministic dual-reset behavior and superior 5 V speed, making it optimal for industrial control where output stability during register updates is non-negotiable.

Availability

74HCT594T16-13 is available at Aetrix Electronics and suitable for LED matrix display control, industrial PLC I/O expansion, appliance control panels, and test equipment signal routing requiring stable component supply, full RoHS compliance, and TSSOP-16 footprint compatibility.

Supply support for 74HCT594T16-13 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 components for industrial, computing, and consumer applications.

The 74HCT594 belongs to Diodes' HCT logic family - designed for pin-compatible replacement of legacy 74LS devices while delivering CMOS power efficiency, robust ESD tolerance, and wide temperature operation.

FAQ

Can 74HCT594T16-13 operate with a 3.3 V microcontroller's serial data line?

Yes - its inputs accept voltages up to 6.0 V and have Schmitt-trigger thresholds referenced to VCC, so a 3.3 V DS signal meets VIH (≥2.0 V) and VIL (≤0.8 V) specs at VCC = 5 V. No level shifter is needed, simplifying interface design and reducing BOM count.

What happens if SHCP and STCP are tied together?

When SHCP and STCP share a clock, the shift register advances one bit per cycle, and the storage register captures the prior cycle's shifted value - resulting in a one-clock-cycle pipeline delay. This configuration is valid and commonly used for simple serial-to-parallel translation with minimal control logic.

Is Q7S output buffered the same as Q0–Q7?

No - Q7S is the unbuffered serial output of the final shift register stage (FF7), rated for ±4.0 mA, while Q0–Q7 are buffered storage register outputs rated for ±35 mA. Q7S is intended for cascading only, not load driving; connecting it to heavy loads may degrade timing or cause logic errors.

How does the dual reset architecture improve system reliability?

SHR clears only the shift register (preserving current outputs), allowing safe reloading of new data without affecting Q0–Q7 states. STR clears only the output register, enabling immediate forced-off condition (e.g., safety shutdown) without disturbing ongoing shift operations - critical in fail-safe industrial designs.