Diodes Incorporated 74HCT595T16-13

Overview

74HCT595T16-13 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 8 mA output drive at V_CC = 4.5 V, featuring Schmitt-trigger inputs and 52 MHz max clock frequency. It enables microcontroller GPIO expansion in industrial control and appliance interfaces by converting serial bit streams into eight parallel control lines.

For engineers reviewing the 74HCT595T16-13 datasheet, 74HCT595T16-13 pinout, 74HCT595T16-13 application, or 74HCT595T16-13 equivalent, key selection factors include its dual-clock architecture (SHCP/STCP), MR active-low synchronous reset, OE-controlled 3-state outputs, and TSSOP-16 package compatibility with high-density PCB layouts.

Technical Context

The device implements two cascaded 8-bit registers: a serial-input shift register clocked by SHCP and a parallel-output storage register clocked by STCP. Data propagates through the shift register on each SHCP rising edge and transfers to the storage register on STCP rising edge - enabling independent timing of data loading and output latching.

All inputs feature Schmitt-trigger action for noise immunity, accept up to 6.0 V regardless of V_CC, and are ESD-protected to 2 kV HBM. The Q_n outputs source/sink ±35 mA, while Q7S provides serial feedback with ±4 mA drive capability and 42 ns typical propagation delay (SHCP to Q7S).

Key Specifications

Pinout & Package

TSSOP-16 package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, JEDEC MO-153 compliant, optimized for automated SMT assembly and thermal performance in space-constrained designs.

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 SN74HC595N and 74LV595PW, the 74HCT595T16-13 uniquely balances 5 V TTL compatibility, Schmitt-trigger noise rejection, 35 mA drive, and TSSOP packaging-making it optimal for industrial-grade 5 V control systems requiring robustness and layout density.

Availability

74HCT595T16-13 is available at Aetrix Electronics and suitable for industrial control panels, appliance user interfaces, LED signage controllers, and computer peripheral designs requiring stable component supply across extended production lifecycles.

Supply support for 74HCT595T16-13 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the Philippines.

The 74HCT595 belongs to Diodes' legacy logic family designed for drop-in replacement of obsolete 74LS devices in industrial, computing, and consumer applications-emphasizing pin compatibility, enhanced ESD robustness, and RoHS compliance.

FAQ

Can the 74HCT595T16-13 operate with a 3.3 V supply?

No. The 74HCT595T16-13 requires a minimum V_CC of 4.5 V per its recommended operating conditions. At 3.3 V, input thresholds (V_IH ≥ 2.0 V) may not be reliably met, and output drive falls outside specification. For 3.3 V systems, consider the 74LV595 or 74LVC595 variants instead.

What is the function of the Q7S pin in cascade configurations?

Q7S outputs the value shifted out of the Q7 position during each SHCP cycle, allowing direct connection to the DS pin of the next 74HCT595 in a chain. This enables seamless N×8-bit extension without external logic or MCU intervention-critical for scalable LED or I/O expansion.

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

MR asynchronously clears only the shift register to zero; it has no effect on the storage register contents. Outputs remain unchanged until the next STCP pulse transfers the cleared (all-zero) shift register data-or until new data is shifted in and latched. This enables safe initialization without disrupting active outputs.

Is the TSSOP-16 package thermally adequate for continuous 35 mA output loading?

Yes. With θ_JA ≈ 120 °C/W (typical for TSSOP-16 on 2-layer board), total power dissipation at full 35 mA per output (8 channels) is ~140 mW, resulting in <17 °C junction rise above ambient-well within the -40°C to +125°C operating range. No heatsink is required under normal conditions.