Diodes Incorporated 74HCT595S16-13

Overview

74HCT595S16-13 from Diodes Incorporated is an 8-bit serial-in, parallel-out shift register with storage register and 3-state outputs, operating at 4.5–5.5 V, delivering ±35 mA output drive on Q0–Q7, and supporting up to 52 MHz shift clock frequency. It enables microcontroller GPIO expansion in industrial control and appliance interfaces via serial-to-parallel conversion.

For engineers reviewing the 74HCT595S16-13 datasheet, 74HCT595S16-13 pinout, 74HCT595S16-13 application, or 74HCT595S16-13 equivalent, key selection criteria include output drive strength (±35 mA), 3-state OE control timing (tEN/tDIS ≤ 53 ns), Schmitt-trigger input hysteresis, and SO-16 package compatibility with legacy 74LS595 footprints.

Technical Context

The device integrates two synchronous registers: an 8-bit shift register accepting serial data on DS at each SHCP rising edge, and an independent 8-bit storage register loaded on STCP rising edge. MR asynchronously resets the shift register to zero while leaving the storage register unaffected.

All inputs feature Schmitt-trigger action for noise immunity; outputs are 3-state controlled by OE, with Q0–Q7 sourcing/sinking ±35 mA and Q7S sourcing/sinking ±4 mA. The internal architecture ensures Qn outputs change only on STCP edges, decoupling shift and output update timing.

Key Specifications

Pinout & Package

74HCT595S16-13 uses a 16-pin SOIC (SO-16) package with 1.27 mm pitch, 10.0 mm × 4.0 mm body, and 1.5 mm height - compatible with standard wave-solder and reflow profiles for through-hole and surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC595N and 74LV595PW, the 74HCT595S16-13 provides superior noise immunity, higher output drive, full daisy-chain support, and asynchronous reset-making it the preferred choice for industrial, appliance, and test equipment requiring robust, field-deployable serial-to-parallel conversion.

Availability

74HCT595S16-13 is available at Aetrix Electronics and suitable for industrial control panels, appliance user interfaces, LED signage controllers, and automated test fixtures requiring stable component supply across multi-year production cycles.

Supply support for 74HCT595S16-13 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 protection solutions for industrial, computing, and consumer markets.

The 74HCT595 belongs to Diodes' high-speed CMOS logic family designed specifically for drop-in replacement of legacy 74LS devices while delivering improved noise immunity, wider voltage tolerance, and enhanced ESD robustness in harsh environments.

FAQ

Can 74HCT595S16-13 operate reliably at 3.3 V?

No. The 74HCT595S16-13 is specified only for 4.5–5.5 V operation per its Recommended Operating Conditions table. At 3.3 V, VIH minimum is undefined, input thresholds become indeterminate, and output drive collapses below usable levels. For 3.3 V systems, use 74LV595 or 74AHC595 variants instead.

What is the purpose of the Q7S pin, and how is it used in cascaded configurations?

Q7S is the serial output of the shift register's most significant bit. In cascaded setups, Q7S from one 74HCT595 connects to DS of the next, enabling N×8-bit shift chains. Each stage shifts on the same SHCP, while individual STCP pulses allow staggered or synchronized output updates across the chain.

How does the Master Reset (MR) pin interact with the storage register and output states?

MR asynchronously clears only the shift register to zero; it has no effect on the storage register contents or Q0–Q7 output states. Outputs retain their last latched values until STCP is pulsed. This allows safe initialization of serial data flow without disrupting active outputs.

Is the SO-16 package of 74HCT595S16-13 compatible with standard 74LS595 PCB footprints?

Yes. The SO-16 package (S16) has identical 1.27 mm pitch, 10.0 mm × 4.0 mm body dimensions, and pin 1 marking location as industry-standard 74LS595 SOIC packages. No PCB redesign is needed for drop-in replacement, though layout should verify thermal relief and decoupling per Diodes' AP02002 guidelines.