Nexperia USA Inc. 74HCT597DB,112

Overview

74HCT597DB,112 from Nexperia is an 8-bit parallel-in/serial-out shift register with integrated input flip-flops and dual edge-triggered clocks (STCP for storage, SHCP for shifting). It features TTL-compatible inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 23 ns typical propagation delay (SHCP to Q) at 4.5 V - used in industrial PLC I/O expansion and microcontroller GPIO extension.

For engineers reviewing the 74HCT597DB,112 datasheet, 74HCT597DB,112 pinout, 74HCT597DB,112 application, or 74HCT597DB,112 equivalent, this device serves as a robust serial interface bridge for parallel data acquisition in noise-prone environments, with asynchronous master reset (MR), direct parallel load (PL), and clamped inputs enabling safe interfacing to overvoltage sources.

Technical Context

The 74HCT597DB,112 implements a two-stage architecture: an 8-bit parallel input latch (D0–D7) clocked by STCP, feeding a serial shift register clocked by SHCP - both positive-edge triggered. Its TTL-level input thresholds ensure compatibility with legacy 5 V logic families while maintaining CMOS power efficiency.

Functional operation includes asynchronous MR (active LOW) for full register reset, PL (active LOW) for immediate parallel-to-shift transfer, and DS serial input synchronized to SHCP. Input clamp diodes allow current-limiting resistor use for interfacing signals exceeding VCC, enhancing system-level ESD resilience without external protection.

Key Specifications

Pinout & Package

74HCT597DB,112 is packaged in SSOP16 (SOT338-1), a 16-pin plastic shrink small outline package with 0.65 mm pitch, 4.4 mm body width, and exposed pad for thermal enhancement - distinct from SO16 (SOT109-1) and TSSOP16 (SOT403-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel-in/serial-out shift register applications.

Compared with 74HCT597DB,112, the 74HCT165 lacks independent storage latching and parallel load control, limiting timing flexibility, while the SN74LV595AQPWRQ1 trades industrial temperature range and input clamping for automotive qualification - neither replicates the dual-clock, overvoltage-tolerant architecture essential for robust industrial data acquisition.

Availability

74HCT597DB,112 is available at Aetrix Electronics and suitable for industrial PLC modules, microcontroller GPIO expansion, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT597DB,112 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions - delivering energy-efficient, robust components for industrial, automotive, and computing markets.

The 74HCT597 belongs to Nexperia's 74HCT logic family, engineered specifically for TTL-compatible interfacing in industrial control systems where noise immunity, wide temperature operation, and input overvoltage tolerance are critical.

FAQ

What is the maximum clock frequency supported by 74HCT597DB,112?

The 74HCT597DB,112 supports up to 24 MHz maximum shift clock (SHCP) frequency at VCC = 4.5 V and CL = 50 pF, with typical propagation delay of 23 ns. At 5.0 V and reduced load (CL = 15 pF), it achieves 83 MHz - verified in Table 7 of the official Nexperia datasheet Rev. 7 (May 2024).

Can 74HCT597DB,112 interface directly with 3.3 V microcontrollers?

No - the 74HCT597DB,112 requires VCC = 4.5–5.5 V and has TTL-level inputs (VIH ≥ 2.0 V), making it incompatible with direct 3.3 V logic drive. A level shifter or 5 V-tolerant MCU GPIO is required; its outputs swing rail-to-rail (0 V to VCC), so 3.3 V receivers need appropriate voltage translation.

Does 74HCT597DB,112 include internal pull-up or pull-down resistors on control pins?

No - the 74HCT597DB,112 has no internal biasing on MR, PL, STCP, or SHCP. External pull-up resistors (typically 10 kΩ to VCC) are required on MR and PL to ensure defined HIGH states during power-up and idle conditions, as confirmed in functional description Section 6 and Figure 5 timing diagram.

How does the input clamp diode structure affect PCB layout?

The integrated input clamp diodes (anode to GND, cathode to VCC) allow safe interfacing to signals up to VCC + 0.5 V using series current-limiting resistors (e.g., 1 kΩ). Layout must place these resistors close to the IC pins and avoid routing clamped inputs near high-noise traces - per Section 1 and Table 2 of the Nexperia datasheet.